Chemical component and antimicrobial activity of volatile oil of Calycopteris floribunda

The volatile oil of leaves and barks of Calycopteris floribunda was examined by gas chromatography-mass spectrometry (GC-MS). 52 volatile chemical components in leaves were identified. The antimicrobial assay of oils in the leaves and barks was carried out by disk diffusion method in vitro. The major components (mass fraction) in leaves are caryophyllene oxide (13.79%), n-hexadecanoic acid (11.91%) and β-caryophyllene (10.45%). Ten constituents are identified accounting for about 99.98% of the total volatile oil in the bark. Among these components, n-hexadecanoic acid (59.18%), linolic acid (12.70%) and butyl octyl phthalate (8.21%) are the major constituents. The oils exhibit strong antimicrobial activity and display more potent against bacteria than fungi.     

中心复合设计优化玉竹多糖提取工艺

选用二阶旋转中心复合设计法优化玉竹多糖提取工艺。以提取时间,提取温度,料液比为因变量,以玉竹多糖得率（Y）为自变量,分别用两因素相互作用模型和二次多项式模型描述因变量和自变量之间的数学关系,绘制等高线图,确定较优处方并进行验证试验。优化后的提取工艺为提取时间111min,提取温度76℃,料液比1：18．5,在此优化的艺...