The Lianhua Qingwen(LHQW) capsule is a popular traditional Chinese medicine for the treatment of viral respiratory diseases.In particular,it has been recently prescribed to treat infections caused by the severe acute ...The Lianhua Qingwen(LHQW) capsule is a popular traditional Chinese medicine for the treatment of viral respiratory diseases.In particular,it has been recently prescribed to treat infections caused by the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2).However,due to its complex composition,little attention has been directed toward the analysis of chemical constituents present in the LHQW capsule.This study presents a reliable and comprehensive approach to characterizing the chemical constituents present in LHQW by high-performance liquid chromatography-Q Exactive-Orbitrap mass spectrometry(HPLC-Q Exactive-Orbitrap-MS) coupled with gas chromatography-mass spectrometry(GC-MS).An automated library alignment method with a high mass accuracy(within 5 ppm) was used for the rapid identification of compounds.A total of 104 compounds,consisting of alkaloids,flavonoids,phenols,phenolic acids,phenylpropanoids,quinones,terpenoids,and other phytochemicals,were successfully characterized.In addition,the fragmentation pathways and characteristic fragments of some representative compounds were elucidated.GC-MS analysis was conducted to characterize the volatile compounds present in LHQW.In total,17 compounds were putatively characterized by comparing the acquired data with that from the NIST library.The major constituent was menthol,and all the other compounds were terpenoids.This is the first comprehensive report on the identification of the major chemical constituents present in the LHQW capsule by HPLC-Q Exactive-Orbitrap-MS,coupled with GCMS,and the results of this study can be used for the quality control and standardization of LHQW capsules.展开更多
Song Qi, Liu Hu; Gao Shu. Screening and quantitative analysis of volatile markers in the breath of patients with breast cancer Acta Universitatis Medicinalis Anhui, 2010, 45(01) :76-79.
Volatile components of Callistemon rigidus were analyzed by headspace solid phase microextraction-gas chromatography/mass spectrometry.The results showed that 34 volatile components,including alkenes,esters,alcohols,a...Volatile components of Callistemon rigidus were analyzed by headspace solid phase microextraction-gas chromatography/mass spectrometry.The results showed that 34 volatile components,including alkenes,esters,alcohols,and a small amount of acids,heterocycles and alkanes,were identified from C.rigidus flowers.The main components were eucalyptol,aspidinol,terpilenol,vanillylacetone,α-phellandrene,4-pyran-4-1,2,3-dihydro-3,5-dihydroxy-6-methyl,pinene,3-methylcatechol,naphthalene,(+)-limonene,7-methylxanthine and (+)-aromadendrene,the contents of which were 35.39%,10.09%,8.86%,4.51%,3.25%,2.81%,2.75%,2.43%,2.29%,1.3%,1.12% and 1.07%,respectively,all of which accounted for 75.69% of the total relative content.Monoterpenoids are the main components of various types of essential oils.This study provides a theoretical basis for the deep processing of this variety.展开更多
The chemical compositions of volatile oil from fruiting body of Armillaria luteo-virens in Qinghai Province were firstly analyzed with GC-MS and its relevant compositions were detected by calculating chromatographic p...The chemical compositions of volatile oil from fruiting body of Armillaria luteo-virens in Qinghai Province were firstly analyzed with GC-MS and its relevant compositions were detected by calculating chromatographic peak area with normalized method. 21 peaks were separated and 13 compositions were identified which were mainly unsaturated fatty acids, taking 97.1% of the total volatile oil.展开更多
The chemical constituents of the essential oil from the traditional Tibetan medicine of Incarvillea younghusbandii were analyzed by GC-MS.More than 70 peaks were separated and 39 compounds were identified which accoun...The chemical constituents of the essential oil from the traditional Tibetan medicine of Incarvillea younghusbandii were analyzed by GC-MS.More than 70 peaks were separated and 39 compounds were identified which accounted for 66.2% of the total essential oil from the whole plants of I.younghusbandii.展开更多
The chemical constituents of the essential oil from the whole plants of the traditional Tibetan medicine of Codonopsis thalictrifolia Wall.were analyzed by GC-MS.More than 60 peaks were separated and 45 of them were i...The chemical constituents of the essential oil from the whole plants of the traditional Tibetan medicine of Codonopsis thalictrifolia Wall.were analyzed by GC-MS.More than 60 peaks were separated and 45 of them were identified by comparing their mass spectra with that of the standards in the database and the literatures.展开更多
The chemical constituents of the essential oil from the flowers of traditional Tibetan medicine of Cremanthodium brummeo-pilosum were analyzed by GC-MS.More than 60 peaks were separated and 33 compounds were identifie...The chemical constituents of the essential oil from the flowers of traditional Tibetan medicine of Cremanthodium brummeo-pilosum were analyzed by GC-MS.More than 60 peaks were separated and 33 compounds were identified which accounted for 63% of the total essential oil from the flowers of C.brummeo-pilosum.展开更多
Iris bulleyana has long been used as a remedy for detoxication and detumescence. Hydrodistillation was used to extract the essential oil from its rhizomes, and 0.23% oil yield was obtained. Using gas chromatography-ma...Iris bulleyana has long been used as a remedy for detoxication and detumescence. Hydrodistillation was used to extract the essential oil from its rhizomes, and 0.23% oil yield was obtained. Using gas chromatography-mass spectrometry (GC- MS) analysis, 31 chemicals including aristolone, cuparene, β-gurjunene, δ-amorphene, α-muurolene, α-cadinol, camphor, γ-elemene, and τ-cadinol were identified. The essential oil exhibited antibacterial activity against Acetobacter calcoacetica, Bacillus subtillis, Clostridium sporogenes, Clostridium perfringens, Escherichia coli, Salmonella typhii, Staphylococcus aureus, and Yersinia enterocolitica. Its antifungal and antioxidant activities were also tested.展开更多
Objective] To analyze the aroma constituents of essential oils from Chi-monanthus praecox. [Method] Extracted by microwave-assisted hydrodistil ation (MAHD), aroma constituents of essential oils of Chimonanthus prae...Objective] To analyze the aroma constituents of essential oils from Chi-monanthus praecox. [Method] Extracted by microwave-assisted hydrodistil ation (MAHD), aroma constituents of essential oils of Chimonanthus praecox flowers were analyzed by gas chromatography-mass spectrometry (GC-MS). Normalization method was used to determine the constituents quantitatively. [Result] Total y 27 compounds were identified, accounting for 98.85% of total amounts. The main aroma con-stituents are terpenes, aldehydes, esters, alcohols and hydrocarbons. Main compo-nents with relative percentage over 5% are germacrene D (25.62%), bornyl acetate (16.71%), caryophyl ene (10.51%), cis-α-ocimene (5.18%), γ-elemene (8.05%), β-linalool (5.01%), 1-ethenyl-1-methyl-2,4-bis (1-methylethenyl)-cyclohexane (7.18%) and 2,3,4,4α,5,6-hexahydro-1,4αdimethyl-7-(1-methylethyl)-naphthalene (5.20%). [Conclu-sion] The study provided a theoretical reference for the development and utilization of Chimonanthus praecox resources.展开更多
[Objective] The aim was to illustrate the relation between Leptocybe invasa and eucalyptus, so as to provide the basis for scientific control of L. invasa. [Method] The chemical components of eucalyptus were extracted...[Objective] The aim was to illustrate the relation between Leptocybe invasa and eucalyptus, so as to provide the basis for scientific control of L. invasa. [Method] The chemical components of eucalyptus were extracted by solid phase micro-extraction (SPME) technique and ethanol extraction method, and detected by gas chromatograph-mass spectrometer. The relative contents of various components were determined by area normalization. [Result] When eucalyptus was damaged by L. invasa, not only some substances disappeared, but also new substances were induced. Among 4 induced volatiles, the content of terpinolene was the highest of 37.66%. Eight new chemical substances were also detected from the ethanol extract of damaged leaves, and the content of 3-phenyl-2-propenyl phenpropionate was the highest of 30.95%.[Conclusion] The damage caused by L. invasa had obvious effect on composition and contents of chemical components of eucalyptus.展开更多
This paper reports a field survey undertaken to determine the availability of raw material for palm kernel oil commercial production for industrial applications. Both industrial and artisanal wastes from palm kernel o...This paper reports a field survey undertaken to determine the availability of raw material for palm kernel oil commercial production for industrial applications. Both industrial and artisanal wastes from palm kernel oil production were also surveyed as raw material (palm kernel seeds) for green energy production. Results of the field study show that 22% of palm kernel seeds (which represents tons of waste) resulting from palm oil processing plants are dumped while at the artisanal level, 80% of palm kernel seed waste is dumped. Analysis of field study data show<span>s</span><span> that large amounts of waste palm kernel seeds are available to enable large scale production of palm kernel oil (PKO) for desirable industrial applications in green energy production. The paper also reports on the physical and chemical properties of Cameroon palm kernel oil (PKO). Palm kernel oil was extracted using mechanical press and solvent extraction. The palm kernel oil (PKO) from Cameroon was analyzed by standard physico-chemical methods. Results of the physical measurements show a specific gravity of PKO of 0.92 kg/L, viscosity of 26.03 cSt and at 5.93 cSt at 40<span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"=""><span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">°</span></span>C and 100<span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"=""><span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">°</span></span>C respectively, viscosity index of 185, pour point of 20<span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"=""><span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">°</span></span>C, cloud point of 29<span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"=""><span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">°</span></span>C, flash point of 200<span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"=""><span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">°</span></span>C, aniline point of 105<span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"=""><span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">°</span></span>F, diesel index of 23, cetane number of 27 and ASTM (American Standards for Testing and Materials) color of less than 2.5. Results of chemical analyses showed an acid val<span>ue of 17.95 mg KOH/g, free fatty <span>acid (FFA) content of 8.98 mg KOH/g, iodine value o</span></span></span><span><span><span>f 2.10</span><span> mg</span></span></span><span> </span><span><span style="font-family:Verdana;">I</span><sub><span style="font-family:Verdana;">2</span></sub><span><span style="font-family:Verdana;">/g</span><span style="font-family:Verdana;">, peroxide value of 2.10 meq/kg, ester value of 123.0 mg KOH/g, hydroxyl value of 93.4 mg OH/g, saponification value of 140.95 mg KOH/g and a sulfur content of 0.016% w/v, signifying low sulfur content. Gas chromatography-mass spectrometry (GC-MS) showed the palm kernel oil to be predominantly made up of glycerides of various fatty acids with higher proportions of C12 to C16 fatty acid residues. Cameroon PKO therefore has a broad spectrum of industrial applications by virtue of its rich physical and chemical properties.</span></span></span>展开更多
The search for new prototype drugs to combat infection is an absolute necessity and in this regard plant essential oils may offer great potential and hope. In this investigation, the essential oil of the leaves ofMent...The search for new prototype drugs to combat infection is an absolute necessity and in this regard plant essential oils may offer great potential and hope. In this investigation, the essential oil of the leaves ofMentha officinalis grown in Rwanda was extracted by hydrodistillation method and analyzed by gas chromatography (GC) and gas chromatography coupled with mass spectrometry (GC-MS). The disc diffusion method was used to evaluate in vitro the zone of bacterial growth inhibition at various concentrations of the oil for five bacterial strains: Escherichia coli, Bacillus aureus, Streptococcus lactis, Staphylococcus aureus and Salmonella typhimurium. The results of this study revealed many components among which the major components were menthol (80.79%), menthone (4.906%), isomenthone (3.5%), piperitone (2.56%), and methyl acetate (2.2%). After 7 days of incubation on PCA medium, the growth of Escherichia coli, Bacillus aureus, Streptococcus lactis and Staphylococcus aureus was totally inhibited at an average diameter of 19 mm, 32 mm, 50 mm and 30 mm respectively by a medium concentration of 30 μm/disc ofM. officinalis oil. Quite the reverse, this investigation by a bioassay showed that the essential oil ofM. officinalis has no effect on Salmonella typhimurium. The obtained results in the present study indicate the possibility of exploiting the essential oil ofM. officinalis to combat so many infectious human diseases in Rwanda. However, further investigations are required to make the medical exploitation of this plant successful.展开更多
The flowers of ZhaoFen and RouFurong may contain essential oils with natural aromatic ingredients. In the present work, the chemical compositions of essential oil of Paeonia suffruticosa Andrews from the flowers of Zh...The flowers of ZhaoFen and RouFurong may contain essential oils with natural aromatic ingredients. In the present work, the chemical compositions of essential oil of Paeonia suffruticosa Andrews from the flowers of ZhaoFen and RouFurong grown only in China were investigated by GC-MS analysis. The results indicate that there are 27 constituents in ZhaoFen and 29 constituents in RouFurong, which account for 96.04% and 95.90% of the oils of ZhaoFen and RouFurong, respectively. The major components of the essential oils are character-rized by oxygenated terpenols, and their content is, respectively, 85.06% and 83.47%. The essential oil of Paeonia suffruticosa Andrews was reported for the first time on the aerial parts.展开更多
Nano-TiO2 photocatalytic oxidation was used to perform the advanced treatment of biologically treated chemical comprehensive wastewater. The effects of reaction time,nano-TiO2 dosage and initial p H of the wastewater ...Nano-TiO2 photocatalytic oxidation was used to perform the advanced treatment of biologically treated chemical comprehensive wastewater. The effects of reaction time,nano-TiO2 dosage and initial p H of the wastewater on the removal rate of COD were tested. The GC/MS and EEM techniques were used to qualitatively analyze organic compounds in the wastewater before and after treatment. The result showed that after the biologically treated chemical comprehensive wastewater was treated by nano-TiO2 photocatalytic oxidation under the conditions of reaction time 3 h,nano-TiO2 dosage 8 g/L,and pH 8. 0,the effluent COD was 61. 9 mg/L and its removal rate was 63. 8%. Additionally,the species of organic pollutants reduced from 12 to 6. Meanwhile,the content of humic-like and fulvic-like substances dropped dramatically.展开更多
基金financially supported by the Fundamental Research Funds for the Central Universities (Grant No.: 2042020kf1003)。
文摘The Lianhua Qingwen(LHQW) capsule is a popular traditional Chinese medicine for the treatment of viral respiratory diseases.In particular,it has been recently prescribed to treat infections caused by the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2).However,due to its complex composition,little attention has been directed toward the analysis of chemical constituents present in the LHQW capsule.This study presents a reliable and comprehensive approach to characterizing the chemical constituents present in LHQW by high-performance liquid chromatography-Q Exactive-Orbitrap mass spectrometry(HPLC-Q Exactive-Orbitrap-MS) coupled with gas chromatography-mass spectrometry(GC-MS).An automated library alignment method with a high mass accuracy(within 5 ppm) was used for the rapid identification of compounds.A total of 104 compounds,consisting of alkaloids,flavonoids,phenols,phenolic acids,phenylpropanoids,quinones,terpenoids,and other phytochemicals,were successfully characterized.In addition,the fragmentation pathways and characteristic fragments of some representative compounds were elucidated.GC-MS analysis was conducted to characterize the volatile compounds present in LHQW.In total,17 compounds were putatively characterized by comparing the acquired data with that from the NIST library.The major constituent was menthol,and all the other compounds were terpenoids.This is the first comprehensive report on the identification of the major chemical constituents present in the LHQW capsule by HPLC-Q Exactive-Orbitrap-MS,coupled with GCMS,and the results of this study can be used for the quality control and standardization of LHQW capsules.
文摘Song Qi, Liu Hu; Gao Shu. Screening and quantitative analysis of volatile markers in the breath of patients with breast cancer Acta Universitatis Medicinalis Anhui, 2010, 45(01) :76-79.
文摘Volatile components of Callistemon rigidus were analyzed by headspace solid phase microextraction-gas chromatography/mass spectrometry.The results showed that 34 volatile components,including alkenes,esters,alcohols,and a small amount of acids,heterocycles and alkanes,were identified from C.rigidus flowers.The main components were eucalyptol,aspidinol,terpilenol,vanillylacetone,α-phellandrene,4-pyran-4-1,2,3-dihydro-3,5-dihydroxy-6-methyl,pinene,3-methylcatechol,naphthalene,(+)-limonene,7-methylxanthine and (+)-aromadendrene,the contents of which were 35.39%,10.09%,8.86%,4.51%,3.25%,2.81%,2.75%,2.43%,2.29%,1.3%,1.12% and 1.07%,respectively,all of which accounted for 75.69% of the total relative content.Monoterpenoids are the main components of various types of essential oils.This study provides a theoretical basis for the deep processing of this variety.
基金the National Natural Science Foundation of China (30460083)the Key Science and Technology Project of Chinese Ministry of Education (205164)~~
文摘The chemical compositions of volatile oil from fruiting body of Armillaria luteo-virens in Qinghai Province were firstly analyzed with GC-MS and its relevant compositions were detected by calculating chromatographic peak area with normalized method. 21 peaks were separated and 13 compositions were identified which were mainly unsaturated fatty acids, taking 97.1% of the total volatile oil.
文摘The chemical constituents of the essential oil from the traditional Tibetan medicine of Incarvillea younghusbandii were analyzed by GC-MS.More than 70 peaks were separated and 39 compounds were identified which accounted for 66.2% of the total essential oil from the whole plants of I.younghusbandii.
文摘The chemical constituents of the essential oil from the whole plants of the traditional Tibetan medicine of Codonopsis thalictrifolia Wall.were analyzed by GC-MS.More than 60 peaks were separated and 45 of them were identified by comparing their mass spectra with that of the standards in the database and the literatures.
文摘The chemical constituents of the essential oil from the flowers of traditional Tibetan medicine of Cremanthodium brummeo-pilosum were analyzed by GC-MS.More than 60 peaks were separated and 33 compounds were identified which accounted for 63% of the total essential oil from the flowers of C.brummeo-pilosum.
基金supported by the National Natural Science Foundation of China (30560033)the Yunnan Provincial Natural Science Foundation, China(2007C001M)
文摘Iris bulleyana has long been used as a remedy for detoxication and detumescence. Hydrodistillation was used to extract the essential oil from its rhizomes, and 0.23% oil yield was obtained. Using gas chromatography-mass spectrometry (GC- MS) analysis, 31 chemicals including aristolone, cuparene, β-gurjunene, δ-amorphene, α-muurolene, α-cadinol, camphor, γ-elemene, and τ-cadinol were identified. The essential oil exhibited antibacterial activity against Acetobacter calcoacetica, Bacillus subtillis, Clostridium sporogenes, Clostridium perfringens, Escherichia coli, Salmonella typhii, Staphylococcus aureus, and Yersinia enterocolitica. Its antifungal and antioxidant activities were also tested.
基金Supported by the Research Fund from Guizhou Academy of Agricultural Science(2013009)Innovation Capacity Platform Construction Project of Guizhou Science and Technology Department(20104008)~~
文摘Objective] To analyze the aroma constituents of essential oils from Chi-monanthus praecox. [Method] Extracted by microwave-assisted hydrodistil ation (MAHD), aroma constituents of essential oils of Chimonanthus praecox flowers were analyzed by gas chromatography-mass spectrometry (GC-MS). Normalization method was used to determine the constituents quantitatively. [Result] Total y 27 compounds were identified, accounting for 98.85% of total amounts. The main aroma con-stituents are terpenes, aldehydes, esters, alcohols and hydrocarbons. Main compo-nents with relative percentage over 5% are germacrene D (25.62%), bornyl acetate (16.71%), caryophyl ene (10.51%), cis-α-ocimene (5.18%), γ-elemene (8.05%), β-linalool (5.01%), 1-ethenyl-1-methyl-2,4-bis (1-methylethenyl)-cyclohexane (7.18%) and 2,3,4,4α,5,6-hexahydro-1,4αdimethyl-7-(1-methylethyl)-naphthalene (5.20%). [Conclu-sion] The study provided a theoretical reference for the development and utilization of Chimonanthus praecox resources.
基金Supported by National Natural Science Foundation of China(31160165)Forestry Science and Technology Project of Guangxi Province[GLKZ(2009)No.3]Project for Innovation Plan of Guangxi Graduate Education(105931003090)
文摘[Objective] The aim was to illustrate the relation between Leptocybe invasa and eucalyptus, so as to provide the basis for scientific control of L. invasa. [Method] The chemical components of eucalyptus were extracted by solid phase micro-extraction (SPME) technique and ethanol extraction method, and detected by gas chromatograph-mass spectrometer. The relative contents of various components were determined by area normalization. [Result] When eucalyptus was damaged by L. invasa, not only some substances disappeared, but also new substances were induced. Among 4 induced volatiles, the content of terpinolene was the highest of 37.66%. Eight new chemical substances were also detected from the ethanol extract of damaged leaves, and the content of 3-phenyl-2-propenyl phenpropionate was the highest of 30.95%.[Conclusion] The damage caused by L. invasa had obvious effect on composition and contents of chemical components of eucalyptus.
文摘This paper reports a field survey undertaken to determine the availability of raw material for palm kernel oil commercial production for industrial applications. Both industrial and artisanal wastes from palm kernel oil production were also surveyed as raw material (palm kernel seeds) for green energy production. Results of the field study show that 22% of palm kernel seeds (which represents tons of waste) resulting from palm oil processing plants are dumped while at the artisanal level, 80% of palm kernel seed waste is dumped. Analysis of field study data show<span>s</span><span> that large amounts of waste palm kernel seeds are available to enable large scale production of palm kernel oil (PKO) for desirable industrial applications in green energy production. The paper also reports on the physical and chemical properties of Cameroon palm kernel oil (PKO). Palm kernel oil was extracted using mechanical press and solvent extraction. The palm kernel oil (PKO) from Cameroon was analyzed by standard physico-chemical methods. Results of the physical measurements show a specific gravity of PKO of 0.92 kg/L, viscosity of 26.03 cSt and at 5.93 cSt at 40<span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"=""><span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">°</span></span>C and 100<span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"=""><span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">°</span></span>C respectively, viscosity index of 185, pour point of 20<span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"=""><span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">°</span></span>C, cloud point of 29<span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"=""><span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">°</span></span>C, flash point of 200<span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"=""><span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">°</span></span>C, aniline point of 105<span style="color:#4F4F4F;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"=""><span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">°</span></span>F, diesel index of 23, cetane number of 27 and ASTM (American Standards for Testing and Materials) color of less than 2.5. Results of chemical analyses showed an acid val<span>ue of 17.95 mg KOH/g, free fatty <span>acid (FFA) content of 8.98 mg KOH/g, iodine value o</span></span></span><span><span><span>f 2.10</span><span> mg</span></span></span><span> </span><span><span style="font-family:Verdana;">I</span><sub><span style="font-family:Verdana;">2</span></sub><span><span style="font-family:Verdana;">/g</span><span style="font-family:Verdana;">, peroxide value of 2.10 meq/kg, ester value of 123.0 mg KOH/g, hydroxyl value of 93.4 mg OH/g, saponification value of 140.95 mg KOH/g and a sulfur content of 0.016% w/v, signifying low sulfur content. Gas chromatography-mass spectrometry (GC-MS) showed the palm kernel oil to be predominantly made up of glycerides of various fatty acids with higher proportions of C12 to C16 fatty acid residues. Cameroon PKO therefore has a broad spectrum of industrial applications by virtue of its rich physical and chemical properties.</span></span></span>
文摘The search for new prototype drugs to combat infection is an absolute necessity and in this regard plant essential oils may offer great potential and hope. In this investigation, the essential oil of the leaves ofMentha officinalis grown in Rwanda was extracted by hydrodistillation method and analyzed by gas chromatography (GC) and gas chromatography coupled with mass spectrometry (GC-MS). The disc diffusion method was used to evaluate in vitro the zone of bacterial growth inhibition at various concentrations of the oil for five bacterial strains: Escherichia coli, Bacillus aureus, Streptococcus lactis, Staphylococcus aureus and Salmonella typhimurium. The results of this study revealed many components among which the major components were menthol (80.79%), menthone (4.906%), isomenthone (3.5%), piperitone (2.56%), and methyl acetate (2.2%). After 7 days of incubation on PCA medium, the growth of Escherichia coli, Bacillus aureus, Streptococcus lactis and Staphylococcus aureus was totally inhibited at an average diameter of 19 mm, 32 mm, 50 mm and 30 mm respectively by a medium concentration of 30 μm/disc ofM. officinalis oil. Quite the reverse, this investigation by a bioassay showed that the essential oil ofM. officinalis has no effect on Salmonella typhimurium. The obtained results in the present study indicate the possibility of exploiting the essential oil ofM. officinalis to combat so many infectious human diseases in Rwanda. However, further investigations are required to make the medical exploitation of this plant successful.
文摘The flowers of ZhaoFen and RouFurong may contain essential oils with natural aromatic ingredients. In the present work, the chemical compositions of essential oil of Paeonia suffruticosa Andrews from the flowers of ZhaoFen and RouFurong grown only in China were investigated by GC-MS analysis. The results indicate that there are 27 constituents in ZhaoFen and 29 constituents in RouFurong, which account for 96.04% and 95.90% of the oils of ZhaoFen and RouFurong, respectively. The major components of the essential oils are character-rized by oxygenated terpenols, and their content is, respectively, 85.06% and 83.47%. The essential oil of Paeonia suffruticosa Andrews was reported for the first time on the aerial parts.
文摘Nano-TiO2 photocatalytic oxidation was used to perform the advanced treatment of biologically treated chemical comprehensive wastewater. The effects of reaction time,nano-TiO2 dosage and initial p H of the wastewater on the removal rate of COD were tested. The GC/MS and EEM techniques were used to qualitatively analyze organic compounds in the wastewater before and after treatment. The result showed that after the biologically treated chemical comprehensive wastewater was treated by nano-TiO2 photocatalytic oxidation under the conditions of reaction time 3 h,nano-TiO2 dosage 8 g/L,and pH 8. 0,the effluent COD was 61. 9 mg/L and its removal rate was 63. 8%. Additionally,the species of organic pollutants reduced from 12 to 6. Meanwhile,the content of humic-like and fulvic-like substances dropped dramatically.