Isolation and structure assignment of an antimicrobial principle from the volatile oil of Nigella sativa L. seeds.
Refrigeration of the volatile oil of Nigella sativa L. seeds eventuates in a crystalline substance. The chemical structure of the compound was drawn from its chemical behaviour, as well as from its UV, IR, PMR and mass spectral data. The compound was found to be thymohydroquinone: confirmation of the structure was established via the preparation of its corresponding diacetate ester. The compound was found to have high antimicrobial effect against gram positive microorganisms
OBJECTIVE ::: To provide evidence for identification of the morphology and histology of Pinellia pedatisecta Schott. ::: ::: ::: METHODS ::: Using microscope and scanning electron microscope, characteristics of the Pinellia pedatisecta Schott. were studied comparatively. ::: ::: ::: RESULTS ::: The surface of leaves, fruits, testa and pollen grain of the cultivated Pinellia pedatisecta Schott. showed different characteristics. ::: ::: ::: CONCLUSION ::: The results of the study can be used for the identification of the Pinellia pedatisecta Schott. in Shandong.