Oral candidiasis is caused by Candida albicans. The symptoms including pain in the oral cavity affect our eating function. While some antifungal agents are commonly used for the treatment of candidiasis, occasional co...Oral candidiasis is caused by Candida albicans. The symptoms including pain in the oral cavity affect our eating function. While some antifungal agents are commonly used for the treatment of candidiasis, occasional consumption of the effective dose cannot be tolerated due to side effects. There is also a possibility of induction of antifungal resistance, thus the development of replacement agents has been awaited. We aim to explore antimicrobial activities of essential oils. We evaluated the antifungal activities against C. albicans of essential oils from seven aromatic plants from three manufacturers, and of three chemotype essential oils from rosemary (Rosmarinus officinalis). As a result, we found that the antifungal activity was increased several times by the addition of Tween 80. All the tested essential oils showed stable antifungal activity, however, the variation was observed among the manufacturers of rosemary and eucalyptus. Rosemary has three chemotypes;CINEOL, CAMPHOR and VERBENON. They derived from a same plant species, but contain different chemical components. The CINEOL, dose-dependently decreased the number of C. albicans in the time-kill assay. Hence we concluded that the components of rosemary essential oil would have an effect on its antifungal activity. A chemotype is the first to consider in measuring antifungal activities of rosemary oil.展开更多
This study was aimed to encapsulate Ziziphora clinopodioides –Rosmarinus officinalis essential oil (Z-REO) using sodium alginate (NaAlg) and to evaluate its performance on antimicrobial and antioxidative activities a...This study was aimed to encapsulate Ziziphora clinopodioides –Rosmarinus officinalis essential oil (Z-REO) using sodium alginate (NaAlg) and to evaluate its performance on antimicrobial and antioxidative activities and sensory attributes in lamb burger patties during cold storage for 12 days.GC-MS analysis of Z-REO indicated carvacrol (21.5%) and thymol (16.9%) were the major components.SEM images showed the formation of encapsulated particles.The presence of encapsulated Z-REO in NaAlg was proved based on the increase in band intensity of FTIR spectra.By increasing mass ratios of NaAlg:Z-REO from 1:1 to 2:1,and 4:1,encapsulation efficiency was increased.Average zeta-potential values (mV) of the mass ratios 4:1 and 2:1 were −48.67 and −44.83,indicating the stability of encapsulated particles.The average size of particles ranged from 159.14 nm to 256.14 nm.The results showed that the encapsulated nanoparticles could markedly decrease the growth of inoculated Escherichia coli O157:H7 and Staphylococcus aureus and delay the lipid oxidation of lamb patties compared to the control samples and in samples with free Z-REO.Furthermore,nanoparticles efficiently decreased discoloration and off-odor development in the patties.Therefore,NaAlg-Z-REO nanoparticles could efficiently reduce bacterial growth and oxidative or sensory deterioration of lamb patties during storage.展开更多
Objective:To evaluate toxic activities of essential oils obtained from Rosmarinus officinalis and Lavandula stoechas against the fourth larval instars of Orgyia trigotephras.Methods:A total of 1200 larvae were divided...Objective:To evaluate toxic activities of essential oils obtained from Rosmarinus officinalis and Lavandula stoechas against the fourth larval instars of Orgyia trigotephras.Methods:A total of 1200 larvae were divided into three groups-I,II,III.Group I was to investigate the effect of extracted essential oils from these aromatic plants as gastric disturbance.Bacillus thuringiensis was used as referencee and ethanol as control.Group II was used as contact action and Group III was used as fumigant action.For both Groups II and III,Decis was used as reference and ethanol as control.During the three experiments,the effect of essential oils on larvae was assessed.Results:The chemical composition of essential oils from two medicinal plants was determined,and their insecticidal effects on the fourth larval state of Orgyia trigotephras were assessed.They presented an insecticidal activity.Rosmarinus officinalis essential oil was less efficient compared to Lavandula stoechas.Conclusions:The relationship between the chemical composition and the biological activities is confirmed by the present findings.Therefore the potential uses of these essential oils as bioinsecticides can be considered as an alternative to the use of synthetic products.展开更多
文摘Oral candidiasis is caused by Candida albicans. The symptoms including pain in the oral cavity affect our eating function. While some antifungal agents are commonly used for the treatment of candidiasis, occasional consumption of the effective dose cannot be tolerated due to side effects. There is also a possibility of induction of antifungal resistance, thus the development of replacement agents has been awaited. We aim to explore antimicrobial activities of essential oils. We evaluated the antifungal activities against C. albicans of essential oils from seven aromatic plants from three manufacturers, and of three chemotype essential oils from rosemary (Rosmarinus officinalis). As a result, we found that the antifungal activity was increased several times by the addition of Tween 80. All the tested essential oils showed stable antifungal activity, however, the variation was observed among the manufacturers of rosemary and eucalyptus. Rosemary has three chemotypes;CINEOL, CAMPHOR and VERBENON. They derived from a same plant species, but contain different chemical components. The CINEOL, dose-dependently decreased the number of C. albicans in the time-kill assay. Hence we concluded that the components of rosemary essential oil would have an effect on its antifungal activity. A chemotype is the first to consider in measuring antifungal activities of rosemary oil.
文摘This study was aimed to encapsulate Ziziphora clinopodioides –Rosmarinus officinalis essential oil (Z-REO) using sodium alginate (NaAlg) and to evaluate its performance on antimicrobial and antioxidative activities and sensory attributes in lamb burger patties during cold storage for 12 days.GC-MS analysis of Z-REO indicated carvacrol (21.5%) and thymol (16.9%) were the major components.SEM images showed the formation of encapsulated particles.The presence of encapsulated Z-REO in NaAlg was proved based on the increase in band intensity of FTIR spectra.By increasing mass ratios of NaAlg:Z-REO from 1:1 to 2:1,and 4:1,encapsulation efficiency was increased.Average zeta-potential values (mV) of the mass ratios 4:1 and 2:1 were −48.67 and −44.83,indicating the stability of encapsulated particles.The average size of particles ranged from 159.14 nm to 256.14 nm.The results showed that the encapsulated nanoparticles could markedly decrease the growth of inoculated Escherichia coli O157:H7 and Staphylococcus aureus and delay the lipid oxidation of lamb patties compared to the control samples and in samples with free Z-REO.Furthermore,nanoparticles efficiently decreased discoloration and off-odor development in the patties.Therefore,NaAlg-Z-REO nanoparticles could efficiently reduce bacterial growth and oxidative or sensory deterioration of lamb patties during storage.
文摘Objective:To evaluate toxic activities of essential oils obtained from Rosmarinus officinalis and Lavandula stoechas against the fourth larval instars of Orgyia trigotephras.Methods:A total of 1200 larvae were divided into three groups-I,II,III.Group I was to investigate the effect of extracted essential oils from these aromatic plants as gastric disturbance.Bacillus thuringiensis was used as referencee and ethanol as control.Group II was used as contact action and Group III was used as fumigant action.For both Groups II and III,Decis was used as reference and ethanol as control.During the three experiments,the effect of essential oils on larvae was assessed.Results:The chemical composition of essential oils from two medicinal plants was determined,and their insecticidal effects on the fourth larval state of Orgyia trigotephras were assessed.They presented an insecticidal activity.Rosmarinus officinalis essential oil was less efficient compared to Lavandula stoechas.Conclusions:The relationship between the chemical composition and the biological activities is confirmed by the present findings.Therefore the potential uses of these essential oils as bioinsecticides can be considered as an alternative to the use of synthetic products.
