Microcapsules of volatile oil containing Herba Schizonepetae(VOHS) were prepared by emulsion solvent diffusion method to improve the drug loading and reduce the amount of pharmaceutical excipients.Orthogonal assay was...Microcapsules of volatile oil containing Herba Schizonepetae(VOHS) were prepared by emulsion solvent diffusion method to improve the drug loading and reduce the amount of pharmaceutical excipients.Orthogonal assay was applied to optimize the preparation condition of microcapsulation,and the results illustrated that the ratio of ethyl cellulose(EC) to VOHS influenced the property of VOHS microcapsule significantly.GC-MS analysis indicated that some volatile components with low concentration in VOHS were lost after microencapsulation.The microcapsules prepared with optimum condition had good fluidity,and the holes on the surface of the microcapsules contributed to the release of VOHS.The particles of the microcapsule conformed to a normal distribution with the diameter of 45—220 μm.In the simulated intestinal fluid containing 0.2% sodium dodecyl sulfate,pulegone in VOHS microcapsule showed a certain degree of slow release.Compared with β-cyclodextrin method,the microencapsulation used in the present work could reduce the amount of excipients and increase the drug loading.It was beneficial to reduce the dose of Chinese medicines containing volatile oils.展开更多
Objective To control stem blight disease of Schizonepeta tenuifolia caused by Phytophthora nicotianae. Methods The antagonist effect of 13 Trichoderma strains (including T. viride and T. harzianum) was evaluated upon ...Objective To control stem blight disease of Schizonepeta tenuifolia caused by Phytophthora nicotianae. Methods The antagonist effect of 13 Trichoderma strains (including T. viride and T. harzianum) was evaluated upon mycelia growth of P. nicotianae. Trichoderma strains with high antagonistic activities against the pathogen were used to control stem blight of S. tenuifolia in the field. Results Of 13 Trichoderma strains tested, T. viride strain M3 showed maximum mycelia growth inhibition (83.2%) to the pathogen, followed by T. viride strain Tv04-2 (78.2%) and then T. harzianum strain ThB (65.0%), in vitro. Fungal cell wall degrading enzymes, protease, and β-1,3-glucanase were analyzed qualitatively and quantitatively in further study. T. viride strains M3, Tv04-2, and T. harzianum strain ThB efficiently against P. nicotianae were used to control stem blight of S. tenuifolia in the field, and T. viride strain M3 showed the best biocontrol potential. Conclusion Trichoderma spp. can be used as alternatives of pesticides to control stem blight, one of the serious soilborne diseases of S. tenuifolia caused by P. nicotianae. However, though T. viride strains Tv04-2 and T. harzianum strain ThB are also highly against P. nicotianae in vitro, the controlling efficacy of them on stem blight disease is not as excellent as T. viride strains M3 in the field.展开更多
基金Supported by the Plan Issue of Shanghai Science&Technology Committee(No.13401901100)
文摘Microcapsules of volatile oil containing Herba Schizonepetae(VOHS) were prepared by emulsion solvent diffusion method to improve the drug loading and reduce the amount of pharmaceutical excipients.Orthogonal assay was applied to optimize the preparation condition of microcapsulation,and the results illustrated that the ratio of ethyl cellulose(EC) to VOHS influenced the property of VOHS microcapsule significantly.GC-MS analysis indicated that some volatile components with low concentration in VOHS were lost after microencapsulation.The microcapsules prepared with optimum condition had good fluidity,and the holes on the surface of the microcapsules contributed to the release of VOHS.The particles of the microcapsule conformed to a normal distribution with the diameter of 45—220 μm.In the simulated intestinal fluid containing 0.2% sodium dodecyl sulfate,pulegone in VOHS microcapsule showed a certain degree of slow release.Compared with β-cyclodextrin method,the microencapsulation used in the present work could reduce the amount of excipients and increase the drug loading.It was beneficial to reduce the dose of Chinese medicines containing volatile oils.
基金Central Public-interest Scientific Institution Basal Research Fund (yz-08-09)
文摘Objective To control stem blight disease of Schizonepeta tenuifolia caused by Phytophthora nicotianae. Methods The antagonist effect of 13 Trichoderma strains (including T. viride and T. harzianum) was evaluated upon mycelia growth of P. nicotianae. Trichoderma strains with high antagonistic activities against the pathogen were used to control stem blight of S. tenuifolia in the field. Results Of 13 Trichoderma strains tested, T. viride strain M3 showed maximum mycelia growth inhibition (83.2%) to the pathogen, followed by T. viride strain Tv04-2 (78.2%) and then T. harzianum strain ThB (65.0%), in vitro. Fungal cell wall degrading enzymes, protease, and β-1,3-glucanase were analyzed qualitatively and quantitatively in further study. T. viride strains M3, Tv04-2, and T. harzianum strain ThB efficiently against P. nicotianae were used to control stem blight of S. tenuifolia in the field, and T. viride strain M3 showed the best biocontrol potential. Conclusion Trichoderma spp. can be used as alternatives of pesticides to control stem blight, one of the serious soilborne diseases of S. tenuifolia caused by P. nicotianae. However, though T. viride strains Tv04-2 and T. harzianum strain ThB are also highly against P. nicotianae in vitro, the controlling efficacy of them on stem blight disease is not as excellent as T. viride strains M3 in the field.