The guava plant has achieved viable significance in subtropics and tropics owing to its flexibility to climatic environments,soil conditions and higher human consumption.It is cultivated in vast areas of Asian and Non...The guava plant has achieved viable significance in subtropics and tropics owing to its flexibility to climatic environments,soil conditions and higher human consumption.It is cultivated in vast areas of Asian and Non-Asian countries,including Pakistan.The guava plant is vulnerable to diseases,specifically the leaves and fruit,which result in massive crop and profitability losses.The existing plant leaf disease detection techniques can detect only one disease from a leaf.However,a single leaf may contain symptoms of multiple diseases.This study has proposed a hybrid deep learning-based framework for the real-time detection of multiple diseases from a single guava leaf in several steps.Firstly,Guava Infected Patches Modified MobileNetV2 and U-Net(GIP-MU-NET)has been proposed to segment the infected guava patches.The proposed model consists of modified MobileNetv2 as an encoder,and the U-Net model’s up-sampling layers are used as a decoder part.Secondly,the Guava Leaf SegmentationModel(GLSM)is proposed to segment the healthy and infected leaves.In the final step,the Guava Multiple Leaf Diseases Detection(GMLDD)model based on the YOLOv5 model detects various diseases from a guava leaf.Two self-collected datasets(the Guava Patches Dataset and the Guava Leaf Diseases Dataset)are used for training and validation.The proposed method detected the various defects,including five distinct classes,i.e.,anthracnose,insect attack,nutrition deficiency,wilt,and healthy.On average,the GIP-MU-Net model achieved 92.41%accuracy,the GLSM gained 83.40%accuracy,whereas the proposed GMLDD technique achieved 73.3%precision,73.1%recall,71.0%mAP@0.5 and 50.3 mAP@0.5:0.95 scores for all the aforesaid classes.展开更多
The global market of functional foods and demand for a healthy lifestyle among consumers in recent years is growing. Guava is a highly perishable fruit and a rich source of vitamin C. Guava Cheese (GC) is a semi-solid...The global market of functional foods and demand for a healthy lifestyle among consumers in recent years is growing. Guava is a highly perishable fruit and a rich source of vitamin C. Guava Cheese (GC) is a semi-solid concentrated fruit product that could be consumed as a snack. The objectives were to develop a guava cheese (GC) and determine the antioxidant potential of the product. Formulation consisted of guava puree with added sucrose or agave, chia seeds and almonds. Pectin was added at select concentrations (0.5%, 1%, 1.5%) along with citric acid to enhance the consistency of GC. Physiochemical and sensory parameters were analyzed for extended shelf life (3 months) studies. Moisture content, pH, water activity, color (L*, a*, b*) and texture profile analysis (hardness, springiness, cohesiveness, gumminess, chewiness) did not change over the 90-day period. Ash, protein and fat contents of 0% pectin were 2% lower than GC with pectin. Sensory parameters (firmness, mouthfeel, flavor and overall acceptability) of GC 0% pectin and 1% GC were similar. Total content in 0%, 0.5%, 1%, and 1.5% pectin added GC were 150.49 ± 32.76, 340.17 ± 54.65, 346.39 ± 53.04, and 355.72 ± 14.24 mg gallic acid equivalent (GAE)/100g. Flavonoid content in 0%, 0.5%, 1%, and 1.5% GC were 159.73 ± 13.31, 332.77 ± 13.31, 341.65 ± 15.37, and 350.52 ± 16.60 mg catechin equivalent (CE)/100g. Similarly, antioxidant of potential measure by DPPH radical scavenging was similar in all samples (IC50 at 0.8 mg/ml). Guava cheese may be utilized as a healthy fruit snack because of added alternative sweeteners and functional ingredients to obtain health benefits. Adding pectin to guava cheese improved functionality by increasing antioxidant potential as well as physical properties.展开更多
Guava (Psidium guajava L.), a tropical fruit, belongs to Myrtaceae family. Leaves and fruits of guava have been reported to have an anti-diarrheal, hypoglycemic, lipid lowering, anti-bacterial in addition to antioxida...Guava (Psidium guajava L.), a tropical fruit, belongs to Myrtaceae family. Leaves and fruits of guava have been reported to have an anti-diarrheal, hypoglycemic, lipid lowering, anti-bacterial in addition to antioxidant activities. The aim of this study was to investigate several guava leaf extract cytotoxic effects on healthy clone 9 liver cells and its hepatoprotective effects on ethanol-induced heap-toxicity. It was discovered that when the clone 9 liver cells were treated with guava (Psidium guajava Linn.) extracts for 24 hours, there was no retardation of growth as well as when ethanol and acetone extracts at low concentrations 100 μg/mL and 50 μg/mL were administered however cytototoxic effects were detected at higher concentrations. Water and hot water extracts in concentrations lower than or equal to 500 μg/mL revealed no cytotoxic effects. Injury induction to healthy clone 9 liver cells using 5% alcohol concentration for 30 minutes revealed the hepatoprotective properties of guava (Psidium guajava Linn.) extracts. This was significant in concentrations of 100 μg/mL or lower for ethanol and all concentrations for hot water extracts. Hot water extracts showed higher hepatoprotective and lower cytotoxic properties than other extracts.展开更多
Guava is one of the most important fruits in Pakistan,and is gradually boosting the economy of Pakistan.Guava production can be interrupted due to different diseases,such as anthracnose,algal spot,fruit fly,styler end...Guava is one of the most important fruits in Pakistan,and is gradually boosting the economy of Pakistan.Guava production can be interrupted due to different diseases,such as anthracnose,algal spot,fruit fly,styler end rot and canker.These diseases are usually detected and identified by visual observation,thus automatic detection is required to assist formers.In this research,a new technique was created to detect guava plant diseases using image processing techniques and computer vision.An automated system is developed to support farmers to identify major diseases in guava.We collected healthy and unhealthy images of different guava diseases from the field.Then image labeling was done with the help of an expert to differentiate between healthy and unhealthy fruit.The local binary pattern(LBP)was used for the extraction of features,and principal component analysis(PCA)was used for dimensionality reduction.Disease classification was carried out using multiple classifiers,including cubic support vector machine,Fine K-nearest neighbor(F-KNN),Bagged Tree and RUSBoosted Tree algorithms and achieved 100%accuracy for the diagnosis of fruit flies disease using Bagged Tree.However,the findings indicated that cubic support vector machines(C-SVM)was the best classifier for all guava disease mentioned in the dataset.展开更多
Frequent consumption of fruits and vegetables has been associated with low risk of chronic diseases. Guava (Psidium guajava Linn.) is a tropical, seasonal fruit rich in antioxidants, vitamin C and polyphenol compounds...Frequent consumption of fruits and vegetables has been associated with low risk of chronic diseases. Guava (Psidium guajava Linn.) is a tropical, seasonal fruit rich in antioxidants, vitamin C and polyphenol compounds. Drying is one of the common methods to preserve and extend the shelf life of guava. The objective of this study was to determine the effect of drying techniques on the antioxidant activity of guava fruit. Guava was air dried in air dryer (45°C), freeze dryer and by osmatic drying techniques. Fresh guava extracts (FGE), freeze dried guava extracts (FDGE), oven dried guava extracts (ODGE) and osmotic-dehydrated guava extracts (OSGE) guava extracts were prepared and analyzed for total polyphenols (TP), flavonoids, antioxidant potential by 2,2-diphenyl-1-picrylhydrazyl (DPPH), ferric reducing antioxidant power (FRAP), oxygen radical absorbance capacity (ORAC), trolox equivalent antioxidant capacity (TEAC), total antioxidant capacity (TAC) and nitric oxide radical scavenging activity (NORS). Inhibitory potential of guava extracts on enzymes α-glucosidase, α-amylase and lipase was also determined. TP in FG, FD, OD, and OS were 415.69 ± 56.95, 295.30 ± 4.11, 303.57 ± 1.41, and 182.93 ± 6.48 mg gallic acid equivalent (GAE)/100g, respectively. Flavonoids in Fresh, FD, OD, and OS were 202.01 ± 0.16, 96.93 ± 1.73, 105.07 ± 0.58, and 76.13 ± 2.74 mg catechin equivalent (CE)/100 g, respectively. FD extracts were the most effective in scavenging DPPH radical. Whereas FRAP, TEAC and TAC activities were found to be higher in FG followed by OD and FD. However, NORS activity of FD was significantly (p ≤ 0.05) lower compared to other treatments. Inhibition of α-glycosidase, α-amylase and lipase enzymes was (19% - 90%) observed at 0.4, 0.8, and 0.8 mg/ml, respectively. In conclusion, considering this in-vitro study, drying could be effectively utilized to preserve guava fruit with minimum effect on health benefits.展开更多
PBS (Phosphate Buffed Saline), pH 7.4 extract of Guava leaves (<i>Psidium</i> <i>guajava</i> L.) inhibits the active MMP-2 like molecule both of plant origin as well as active MMP-2 of human (b...PBS (Phosphate Buffed Saline), pH 7.4 extract of Guava leaves (<i>Psidium</i> <i>guajava</i> L.) inhibits the active MMP-2 like molecule both of plant origin as well as active MMP-2 of human (breast cancer patients’ saliva) origin. The zymogram and ELISA were developed of different samples following standard methods. The isolation and identification of the new MMP-2 inhibitor(s) for its molecular characterization is under investigation.展开更多
Red and white guavas were treated with wax emulsion or irradiation (0.25-2.0 kGy) and kept for 12 days at room temperature. Initiation of rot attack occurred after 3 days which increased significantly during further s...Red and white guavas were treated with wax emulsion or irradiation (0.25-2.0 kGy) and kept for 12 days at room temperature. Initiation of rot attack occurred after 3 days which increased significantly during further storage. In the waxed fruits rottage, weight loss and vitamin loss were significantly less than controls and irradiated ones. Sensory scores decreased with storage time and they ranged 3.7-4.5, 2.1-3.9 and 2.3-2.7 in waxed, radiated and untreated controls respectively, after 12 days storage. Waxing was found to increase the. shelf life of this fruit for 3-4 d while irradiation exhibited no beneficial effects.展开更多
A non-destructive method for assessing the maturity of guava was developed based on the mechanical properties of the fruit under the slight falling impact test. The levels of maturity were classified with cluster and ...A non-destructive method for assessing the maturity of guava was developed based on the mechanical properties of the fruit under the slight falling impact test. The levels of maturity were classified with cluster and discriminant analyses on the primitive impact measurements and their derivatives. The accuracy of classification was improved with linear discriminant analysis and the number of indices being processed was reduced with stepwise regression analysis. The accuracy of classification is 84.21%. The performance shows that slight falling impact together with linear discriminant analysis provides a promising non-destructive approach in assessing the maturity of guavas.展开更多
The leaf of Psidium guava is traditionally used in Asia to manage, control and treat diabetes. We designed this study to elucidate the effect of the administration of oral doses of aqueous and ethanol extract from Psi...The leaf of Psidium guava is traditionally used in Asia to manage, control and treat diabetes. We designed this study to elucidate the effect of the administration of oral doses of aqueous and ethanol extract from Psidium guava leaves on plasma glucose, lipid profiles and the sensitivity of the vascular mesenteric bed to Phenylephrine in diabetic and non diabetic rats. Animals were divided into 5 groups (n = 10): two groups served as non-diabetic controls (NDC), while the other groups had diabetes induced with a single injection of streptozotocin (STZ). Psidium guava-treated chronic diabetic (PSG-CD) and Psidium guava-treated controls (PSG-C) received 1g/l of Psidium guavaadded to the drinking water for 8 weeks. The mesenteric vascular beds were prepared using the McGregor method. Administration of Psidium guava caused Ca/Mg ratio, plasma glucose, high density lipoprotein (HDL), low density lipoprotein (LDL), very low density lipoprotein (VLDL), total cholesterol and triglyceride concentrations to return to normal levels, and was shown to decrease alteration in vascular reactivity to vasoconstrictor agents. Our results support the hypothesis that Psidium guava could play a role in the management of diabetes and the prevention of vascular complications in STZ-induced diabetic rats.展开更多
<span style="font-family:Verdana;">Globally dental diseases are mainly caused by</span><i><span style="font-family:Verdana;"> Streptococcus mutans</span></i><...<span style="font-family:Verdana;">Globally dental diseases are mainly caused by</span><i><span style="font-family:Verdana;"> Streptococcus mutans</span></i><span style="font-family:""><span style="font-family:Verdana;">, it is one of the leading causative agents of dental caries worldwide, because of its resistance to </span><span><span style="font-family:Verdana;">conventional antibacterial agents, alternative therapies are used to control resistance of oral pathogens. This research was done to determine the antibacterial activities of </span><i><span style="font-family:Verdana;">Psidium guajava</span></i><span style="font-family:Verdana;"> (guava) and </span><i><span style="font-family:Verdana;">Velvet tamarin</span></i><span style="font-family:Verdana;"> (Icheku) chewing sticks on </span><i><span style="font-family:Verdana;">Streptococcus mutans</span></i><span style="font-family:Verdana;"> isolated from the oral cavity. The study was conducted in Owerri Imo State Nigeria during November-December</span></span><span style="font-family:Verdana;"> period. Phytochemical analysis of the plant extracts was done using appropriate techniques. The procedure used for antimicrobial susceptibility test was disk diffusion method. Serial dilutions of</span><i><span style="font-family:Verdana;"> Psidium guajava</span></i><span style="font-family:Verdana;"> (guava) and </span><i><span style="font-family:Verdana;">Velvet tamarind</span></i><span style="font-family:Verdana;"> (Icheku) extracts were prepared, Muller-Hinton media was used to put together the extract of serial dilutions of </span><i><span style="font-family:Verdana;">Psidium guajava</span></i><span style="font-family:Verdana;"> (guava) and </span><i><span style="font-family:Verdana;">Velvet tamarin</span></i><span style="font-family:Verdana;"> (Icheku) and </span></span><span style="font-family:Verdana;">a </span><span style="font-family:Verdana;">microbiological procedure w</span><span style="font-family:Verdana;">ere</span><span style="font-family:Verdana;"> used for visually determining the minimum inhibitory concentration as well as minimum bactericidal concentration. Phytochemical evaluation of the plants</span><span style="font-family:Verdana;">’</span><span style="font-family:""><span style="font-family:Verdana;"> extracts revealed that it contains saponins, tannins, alkaloid, steriods, glycosides and phenol. The results obtained from the antibacterial susceptibility testing of the extracts against </span><i><span style="font-family:Verdana;">Streptococcus mutans</span></i><span style="font-family:Verdana;"> showed that the zones of inhibition recorded ranged from 18</span></span><span style="font-family:""> </span><span style="font-family:Verdana;">mm to 27</span><span style="font-family:""> </span><span style="font-family:""><span style="font-family:Verdana;">mm. Ethanol (Soxhlet) extract of I</span><span style="font-family:Verdana;">cheku twig showed no zone of inhibition on the isolated organism. The</span><span style="font-family:Verdana;"> ethanol (soxhlet) extract of the individual </span><i><span style="font-family:Verdana;">Psidium guajava</span></i><span style="font-family:Verdana;"> (guava) and </span><i><span style="font-family:Verdana;">Velvet tamarin</span></i><span style="font-family:Verdana;"> (Icheku) has a better antibacterial effect when compared to their aqueous extracts and combined forms. </span><i><span style="font-family:Verdana;">Psidium guajava</span></i><span style="font-family:Verdana;"> (Guava) and </span><i><span style="font-family:Verdana;">Velvet tamarin</span></i><span style="font-family:Verdana;"> (Icheku) twigs are made up of composite that </span></span><span style="font-family:Verdana;">is</span><span style="font-family:""><span style="font-family:Verdana;"> active against </span><i><span style="font-family:Verdana;">S. mutans</span></i><span style="font-family:Verdana;"> and can be used in oral hygiene. There is </span></span><span style="font-family:Verdana;">a </span><span style="font-family:Verdana;">need for further investigation on the plant extracts as the rural poor make use of it because it is cheap, readily available and the rich also use it once they are in the village mostly in Eastern Nigeria. Similarly chewing sticks has been reported to be practiced by 90 of rural population in Nigeria</span><span style="font-family:Verdana;">.展开更多
The leaf-response to three-soil applied treatments of Paclobutrazol (PBZ;1000, 2000 and 0 ppm-control) was studied in a high-density plantation of eight guava (Psidium guajava) genotypes trees. All materials were prun...The leaf-response to three-soil applied treatments of Paclobutrazol (PBZ;1000, 2000 and 0 ppm-control) was studied in a high-density plantation of eight guava (Psidium guajava) genotypes trees. All materials were prunned in vase form, with two to three major branches, yearly prunning for triggering the annual production cycle, and average height of 2.0 m. The dataset comprises fourth radiometric indices highly related to plant physiological activities. The dataset model took into account data collection dates, guava genotypes, and the positional effect of sun radiation on leaves based on their proximity to the canopy level and downward to the base of the woody seasonal-branch. Unexpectedly, there were no significant differences (NS) in PBZ treatments for genotypes, leaf position and radiometric indices. Analysis of the radiometric indices data revealed that anthocyanin (ARI index) and chlorophyll (PRI index) have a strong inverse relationship. Significant differences (P ≤ 0.05) were found between guava genotypes, and anthocyanin content;these results show that guava genotypes have varied responses, which could derive in their classification based-on drought resistance or low water requirements, however, it is important to note that additional research is required to determine the scope of these indications.展开更多
Field studies were carried out during kharif 2016 and summer 2017 at Udyanagiri,UHS,Bagalkot,Karnataka,India to evaluate IPM modules against fruit fly in an already established guava orchard of variety Sardar(L-49).Am...Field studies were carried out during kharif 2016 and summer 2017 at Udyanagiri,UHS,Bagalkot,Karnataka,India to evaluate IPM modules against fruit fly in an already established guava orchard of variety Sardar(L-49).Among four modules,the mean fruit damage was significantly the lowest in M3(0.68%)followed by M2(1.19%)and M1(2.21%)and were on par with each other during kharif 2016.During summer 2017,M3 recorded significantly lowest damage(0.59%)followed by M2(0.92%)and M1(2.41%)but were on with each other.The highest per cent protection was afforded by M3(95.76 and 96.76,respectively)during 2016 and 2017.The average fruit yield over the years of experimentation revealed significantly the highest fruit yield(8.13 t/ha)from M3 followed by M2(7.32 t/ha)and M1(5.31 t/ha).Among the four modules,highest B:C was from M3(7.65)followed by M2(6.67)and M1(4.91).展开更多
Psidium guajava Linn.(family Myrtaceae),is commonly known as guava.Guava is consumed in large quantities throughout the world due to its ease of cultivation and high nutritional value.As an important perennial fruit t...Psidium guajava Linn.(family Myrtaceae),is commonly known as guava.Guava is consumed in large quantities throughout the world due to its ease of cultivation and high nutritional value.As an important perennial fruit tree distributed around the world,guava has been widely used to manage various diseases in traditional medicine.Guava has been shown significant bioactivity such as antioxidant,anti-inflammatory,immunomodulatory,antimicrobial,antidiabetic,and anticancer properties.A large number of studies indicated that guava contains various type of phytochemicals including monoterpenes,sesquiterpenes,triterpenes,phenolics,and meroterpenoids.Among them,meroterpenoids are characteristic components of guava,which are hybrid of acylphloroglucinol with terpenoids(monoterpenes,sesquiterpenes).Modern pharmacological investigations showed intricate Psidium meroterpenoids possess a wide range of bioactivities.Although a large and growing body of literatures have investigated the Psidium meroterpenoids isolated from guava,a comprehensive review of Psidium meroterpenoids and their bioactivities has not been conducted.Therefore,this review provides a comprehensive compile of 75 meroterpenoids isolated from guava and their bioactivities between 2007 and May 2022.Furthermore,the possible biosynthesis way and future directions of Psidium meroterpenoids have also been discussed.展开更多
基金financially supported by the Deanship of Scientific Research,Qassim University,Saudi Arabia for funding the publication of this project.
文摘The guava plant has achieved viable significance in subtropics and tropics owing to its flexibility to climatic environments,soil conditions and higher human consumption.It is cultivated in vast areas of Asian and Non-Asian countries,including Pakistan.The guava plant is vulnerable to diseases,specifically the leaves and fruit,which result in massive crop and profitability losses.The existing plant leaf disease detection techniques can detect only one disease from a leaf.However,a single leaf may contain symptoms of multiple diseases.This study has proposed a hybrid deep learning-based framework for the real-time detection of multiple diseases from a single guava leaf in several steps.Firstly,Guava Infected Patches Modified MobileNetV2 and U-Net(GIP-MU-NET)has been proposed to segment the infected guava patches.The proposed model consists of modified MobileNetv2 as an encoder,and the U-Net model’s up-sampling layers are used as a decoder part.Secondly,the Guava Leaf SegmentationModel(GLSM)is proposed to segment the healthy and infected leaves.In the final step,the Guava Multiple Leaf Diseases Detection(GMLDD)model based on the YOLOv5 model detects various diseases from a guava leaf.Two self-collected datasets(the Guava Patches Dataset and the Guava Leaf Diseases Dataset)are used for training and validation.The proposed method detected the various defects,including five distinct classes,i.e.,anthracnose,insect attack,nutrition deficiency,wilt,and healthy.On average,the GIP-MU-Net model achieved 92.41%accuracy,the GLSM gained 83.40%accuracy,whereas the proposed GMLDD technique achieved 73.3%precision,73.1%recall,71.0%mAP@0.5 and 50.3 mAP@0.5:0.95 scores for all the aforesaid classes.
文摘The global market of functional foods and demand for a healthy lifestyle among consumers in recent years is growing. Guava is a highly perishable fruit and a rich source of vitamin C. Guava Cheese (GC) is a semi-solid concentrated fruit product that could be consumed as a snack. The objectives were to develop a guava cheese (GC) and determine the antioxidant potential of the product. Formulation consisted of guava puree with added sucrose or agave, chia seeds and almonds. Pectin was added at select concentrations (0.5%, 1%, 1.5%) along with citric acid to enhance the consistency of GC. Physiochemical and sensory parameters were analyzed for extended shelf life (3 months) studies. Moisture content, pH, water activity, color (L*, a*, b*) and texture profile analysis (hardness, springiness, cohesiveness, gumminess, chewiness) did not change over the 90-day period. Ash, protein and fat contents of 0% pectin were 2% lower than GC with pectin. Sensory parameters (firmness, mouthfeel, flavor and overall acceptability) of GC 0% pectin and 1% GC were similar. Total content in 0%, 0.5%, 1%, and 1.5% pectin added GC were 150.49 ± 32.76, 340.17 ± 54.65, 346.39 ± 53.04, and 355.72 ± 14.24 mg gallic acid equivalent (GAE)/100g. Flavonoid content in 0%, 0.5%, 1%, and 1.5% GC were 159.73 ± 13.31, 332.77 ± 13.31, 341.65 ± 15.37, and 350.52 ± 16.60 mg catechin equivalent (CE)/100g. Similarly, antioxidant of potential measure by DPPH radical scavenging was similar in all samples (IC50 at 0.8 mg/ml). Guava cheese may be utilized as a healthy fruit snack because of added alternative sweeteners and functional ingredients to obtain health benefits. Adding pectin to guava cheese improved functionality by increasing antioxidant potential as well as physical properties.
文摘Guava (Psidium guajava L.), a tropical fruit, belongs to Myrtaceae family. Leaves and fruits of guava have been reported to have an anti-diarrheal, hypoglycemic, lipid lowering, anti-bacterial in addition to antioxidant activities. The aim of this study was to investigate several guava leaf extract cytotoxic effects on healthy clone 9 liver cells and its hepatoprotective effects on ethanol-induced heap-toxicity. It was discovered that when the clone 9 liver cells were treated with guava (Psidium guajava Linn.) extracts for 24 hours, there was no retardation of growth as well as when ethanol and acetone extracts at low concentrations 100 μg/mL and 50 μg/mL were administered however cytototoxic effects were detected at higher concentrations. Water and hot water extracts in concentrations lower than or equal to 500 μg/mL revealed no cytotoxic effects. Injury induction to healthy clone 9 liver cells using 5% alcohol concentration for 30 minutes revealed the hepatoprotective properties of guava (Psidium guajava Linn.) extracts. This was significant in concentrations of 100 μg/mL or lower for ethanol and all concentrations for hot water extracts. Hot water extracts showed higher hepatoprotective and lower cytotoxic properties than other extracts.
基金This work is supported by the Deanship of Scientific Research at King Saud University through research Group No.RG-1441-379.
文摘Guava is one of the most important fruits in Pakistan,and is gradually boosting the economy of Pakistan.Guava production can be interrupted due to different diseases,such as anthracnose,algal spot,fruit fly,styler end rot and canker.These diseases are usually detected and identified by visual observation,thus automatic detection is required to assist formers.In this research,a new technique was created to detect guava plant diseases using image processing techniques and computer vision.An automated system is developed to support farmers to identify major diseases in guava.We collected healthy and unhealthy images of different guava diseases from the field.Then image labeling was done with the help of an expert to differentiate between healthy and unhealthy fruit.The local binary pattern(LBP)was used for the extraction of features,and principal component analysis(PCA)was used for dimensionality reduction.Disease classification was carried out using multiple classifiers,including cubic support vector machine,Fine K-nearest neighbor(F-KNN),Bagged Tree and RUSBoosted Tree algorithms and achieved 100%accuracy for the diagnosis of fruit flies disease using Bagged Tree.However,the findings indicated that cubic support vector machines(C-SVM)was the best classifier for all guava disease mentioned in the dataset.
文摘Frequent consumption of fruits and vegetables has been associated with low risk of chronic diseases. Guava (Psidium guajava Linn.) is a tropical, seasonal fruit rich in antioxidants, vitamin C and polyphenol compounds. Drying is one of the common methods to preserve and extend the shelf life of guava. The objective of this study was to determine the effect of drying techniques on the antioxidant activity of guava fruit. Guava was air dried in air dryer (45°C), freeze dryer and by osmatic drying techniques. Fresh guava extracts (FGE), freeze dried guava extracts (FDGE), oven dried guava extracts (ODGE) and osmotic-dehydrated guava extracts (OSGE) guava extracts were prepared and analyzed for total polyphenols (TP), flavonoids, antioxidant potential by 2,2-diphenyl-1-picrylhydrazyl (DPPH), ferric reducing antioxidant power (FRAP), oxygen radical absorbance capacity (ORAC), trolox equivalent antioxidant capacity (TEAC), total antioxidant capacity (TAC) and nitric oxide radical scavenging activity (NORS). Inhibitory potential of guava extracts on enzymes α-glucosidase, α-amylase and lipase was also determined. TP in FG, FD, OD, and OS were 415.69 ± 56.95, 295.30 ± 4.11, 303.57 ± 1.41, and 182.93 ± 6.48 mg gallic acid equivalent (GAE)/100g, respectively. Flavonoids in Fresh, FD, OD, and OS were 202.01 ± 0.16, 96.93 ± 1.73, 105.07 ± 0.58, and 76.13 ± 2.74 mg catechin equivalent (CE)/100 g, respectively. FD extracts were the most effective in scavenging DPPH radical. Whereas FRAP, TEAC and TAC activities were found to be higher in FG followed by OD and FD. However, NORS activity of FD was significantly (p ≤ 0.05) lower compared to other treatments. Inhibition of α-glycosidase, α-amylase and lipase enzymes was (19% - 90%) observed at 0.4, 0.8, and 0.8 mg/ml, respectively. In conclusion, considering this in-vitro study, drying could be effectively utilized to preserve guava fruit with minimum effect on health benefits.
文摘PBS (Phosphate Buffed Saline), pH 7.4 extract of Guava leaves (<i>Psidium</i> <i>guajava</i> L.) inhibits the active MMP-2 like molecule both of plant origin as well as active MMP-2 of human (breast cancer patients’ saliva) origin. The zymogram and ELISA were developed of different samples following standard methods. The isolation and identification of the new MMP-2 inhibitor(s) for its molecular characterization is under investigation.
文摘Red and white guavas were treated with wax emulsion or irradiation (0.25-2.0 kGy) and kept for 12 days at room temperature. Initiation of rot attack occurred after 3 days which increased significantly during further storage. In the waxed fruits rottage, weight loss and vitamin loss were significantly less than controls and irradiated ones. Sensory scores decreased with storage time and they ranged 3.7-4.5, 2.1-3.9 and 2.3-2.7 in waxed, radiated and untreated controls respectively, after 12 days storage. Waxing was found to increase the. shelf life of this fruit for 3-4 d while irradiation exhibited no beneficial effects.
文摘A non-destructive method for assessing the maturity of guava was developed based on the mechanical properties of the fruit under the slight falling impact test. The levels of maturity were classified with cluster and discriminant analyses on the primitive impact measurements and their derivatives. The accuracy of classification was improved with linear discriminant analysis and the number of indices being processed was reduced with stepwise regression analysis. The accuracy of classification is 84.21%. The performance shows that slight falling impact together with linear discriminant analysis provides a promising non-destructive approach in assessing the maturity of guavas.
文摘The leaf of Psidium guava is traditionally used in Asia to manage, control and treat diabetes. We designed this study to elucidate the effect of the administration of oral doses of aqueous and ethanol extract from Psidium guava leaves on plasma glucose, lipid profiles and the sensitivity of the vascular mesenteric bed to Phenylephrine in diabetic and non diabetic rats. Animals were divided into 5 groups (n = 10): two groups served as non-diabetic controls (NDC), while the other groups had diabetes induced with a single injection of streptozotocin (STZ). Psidium guava-treated chronic diabetic (PSG-CD) and Psidium guava-treated controls (PSG-C) received 1g/l of Psidium guavaadded to the drinking water for 8 weeks. The mesenteric vascular beds were prepared using the McGregor method. Administration of Psidium guava caused Ca/Mg ratio, plasma glucose, high density lipoprotein (HDL), low density lipoprotein (LDL), very low density lipoprotein (VLDL), total cholesterol and triglyceride concentrations to return to normal levels, and was shown to decrease alteration in vascular reactivity to vasoconstrictor agents. Our results support the hypothesis that Psidium guava could play a role in the management of diabetes and the prevention of vascular complications in STZ-induced diabetic rats.
文摘<span style="font-family:Verdana;">Globally dental diseases are mainly caused by</span><i><span style="font-family:Verdana;"> Streptococcus mutans</span></i><span style="font-family:""><span style="font-family:Verdana;">, it is one of the leading causative agents of dental caries worldwide, because of its resistance to </span><span><span style="font-family:Verdana;">conventional antibacterial agents, alternative therapies are used to control resistance of oral pathogens. This research was done to determine the antibacterial activities of </span><i><span style="font-family:Verdana;">Psidium guajava</span></i><span style="font-family:Verdana;"> (guava) and </span><i><span style="font-family:Verdana;">Velvet tamarin</span></i><span style="font-family:Verdana;"> (Icheku) chewing sticks on </span><i><span style="font-family:Verdana;">Streptococcus mutans</span></i><span style="font-family:Verdana;"> isolated from the oral cavity. The study was conducted in Owerri Imo State Nigeria during November-December</span></span><span style="font-family:Verdana;"> period. Phytochemical analysis of the plant extracts was done using appropriate techniques. The procedure used for antimicrobial susceptibility test was disk diffusion method. Serial dilutions of</span><i><span style="font-family:Verdana;"> Psidium guajava</span></i><span style="font-family:Verdana;"> (guava) and </span><i><span style="font-family:Verdana;">Velvet tamarind</span></i><span style="font-family:Verdana;"> (Icheku) extracts were prepared, Muller-Hinton media was used to put together the extract of serial dilutions of </span><i><span style="font-family:Verdana;">Psidium guajava</span></i><span style="font-family:Verdana;"> (guava) and </span><i><span style="font-family:Verdana;">Velvet tamarin</span></i><span style="font-family:Verdana;"> (Icheku) and </span></span><span style="font-family:Verdana;">a </span><span style="font-family:Verdana;">microbiological procedure w</span><span style="font-family:Verdana;">ere</span><span style="font-family:Verdana;"> used for visually determining the minimum inhibitory concentration as well as minimum bactericidal concentration. Phytochemical evaluation of the plants</span><span style="font-family:Verdana;">’</span><span style="font-family:""><span style="font-family:Verdana;"> extracts revealed that it contains saponins, tannins, alkaloid, steriods, glycosides and phenol. The results obtained from the antibacterial susceptibility testing of the extracts against </span><i><span style="font-family:Verdana;">Streptococcus mutans</span></i><span style="font-family:Verdana;"> showed that the zones of inhibition recorded ranged from 18</span></span><span style="font-family:""> </span><span style="font-family:Verdana;">mm to 27</span><span style="font-family:""> </span><span style="font-family:""><span style="font-family:Verdana;">mm. Ethanol (Soxhlet) extract of I</span><span style="font-family:Verdana;">cheku twig showed no zone of inhibition on the isolated organism. The</span><span style="font-family:Verdana;"> ethanol (soxhlet) extract of the individual </span><i><span style="font-family:Verdana;">Psidium guajava</span></i><span style="font-family:Verdana;"> (guava) and </span><i><span style="font-family:Verdana;">Velvet tamarin</span></i><span style="font-family:Verdana;"> (Icheku) has a better antibacterial effect when compared to their aqueous extracts and combined forms. </span><i><span style="font-family:Verdana;">Psidium guajava</span></i><span style="font-family:Verdana;"> (Guava) and </span><i><span style="font-family:Verdana;">Velvet tamarin</span></i><span style="font-family:Verdana;"> (Icheku) twigs are made up of composite that </span></span><span style="font-family:Verdana;">is</span><span style="font-family:""><span style="font-family:Verdana;"> active against </span><i><span style="font-family:Verdana;">S. mutans</span></i><span style="font-family:Verdana;"> and can be used in oral hygiene. There is </span></span><span style="font-family:Verdana;">a </span><span style="font-family:Verdana;">need for further investigation on the plant extracts as the rural poor make use of it because it is cheap, readily available and the rich also use it once they are in the village mostly in Eastern Nigeria. Similarly chewing sticks has been reported to be practiced by 90 of rural population in Nigeria</span><span style="font-family:Verdana;">.
文摘The leaf-response to three-soil applied treatments of Paclobutrazol (PBZ;1000, 2000 and 0 ppm-control) was studied in a high-density plantation of eight guava (Psidium guajava) genotypes trees. All materials were prunned in vase form, with two to three major branches, yearly prunning for triggering the annual production cycle, and average height of 2.0 m. The dataset comprises fourth radiometric indices highly related to plant physiological activities. The dataset model took into account data collection dates, guava genotypes, and the positional effect of sun radiation on leaves based on their proximity to the canopy level and downward to the base of the woody seasonal-branch. Unexpectedly, there were no significant differences (NS) in PBZ treatments for genotypes, leaf position and radiometric indices. Analysis of the radiometric indices data revealed that anthocyanin (ARI index) and chlorophyll (PRI index) have a strong inverse relationship. Significant differences (P ≤ 0.05) were found between guava genotypes, and anthocyanin content;these results show that guava genotypes have varied responses, which could derive in their classification based-on drought resistance or low water requirements, however, it is important to note that additional research is required to determine the scope of these indications.
文摘Field studies were carried out during kharif 2016 and summer 2017 at Udyanagiri,UHS,Bagalkot,Karnataka,India to evaluate IPM modules against fruit fly in an already established guava orchard of variety Sardar(L-49).Among four modules,the mean fruit damage was significantly the lowest in M3(0.68%)followed by M2(1.19%)and M1(2.21%)and were on par with each other during kharif 2016.During summer 2017,M3 recorded significantly lowest damage(0.59%)followed by M2(0.92%)and M1(2.41%)but were on with each other.The highest per cent protection was afforded by M3(95.76 and 96.76,respectively)during 2016 and 2017.The average fruit yield over the years of experimentation revealed significantly the highest fruit yield(8.13 t/ha)from M3 followed by M2(7.32 t/ha)and M1(5.31 t/ha).Among the four modules,highest B:C was from M3(7.65)followed by M2(6.67)and M1(4.91).
基金This work was financially supported by the National Natural Science Foundation of China(U1802287 and 32170408)the Ten Thousand Talents Plan of Yunnan Province for Industrial Technology Leading Talents(YNWR-CYJS-2019-011)+1 种基金the Project of Yunnan Characteristic Plant Screening and R&D Service CXO Platform(2022YKZY001)the State Key Laboratory of Phytochemistry and Plant Resources in West China(P2019-ZZ02).
文摘Psidium guajava Linn.(family Myrtaceae),is commonly known as guava.Guava is consumed in large quantities throughout the world due to its ease of cultivation and high nutritional value.As an important perennial fruit tree distributed around the world,guava has been widely used to manage various diseases in traditional medicine.Guava has been shown significant bioactivity such as antioxidant,anti-inflammatory,immunomodulatory,antimicrobial,antidiabetic,and anticancer properties.A large number of studies indicated that guava contains various type of phytochemicals including monoterpenes,sesquiterpenes,triterpenes,phenolics,and meroterpenoids.Among them,meroterpenoids are characteristic components of guava,which are hybrid of acylphloroglucinol with terpenoids(monoterpenes,sesquiterpenes).Modern pharmacological investigations showed intricate Psidium meroterpenoids possess a wide range of bioactivities.Although a large and growing body of literatures have investigated the Psidium meroterpenoids isolated from guava,a comprehensive review of Psidium meroterpenoids and their bioactivities has not been conducted.Therefore,this review provides a comprehensive compile of 75 meroterpenoids isolated from guava and their bioactivities between 2007 and May 2022.Furthermore,the possible biosynthesis way and future directions of Psidium meroterpenoids have also been discussed.