Halimodendrin I, a new acylated triterpene glycoside from Halimodendron halodendron (Fabaceae)

Halimodendrin I, a new acylated triterpene glycoside (1), was isolated and chemically characterized as 3β-O-palmitoyl-28-[3′-palmitoyl-β-d-glucopyranosyl]-olean-12-en-28-oic acid from the aerial part of Halimodendron halodendron (Fabaceae) by IR, 1D and 2D NMR, HR-ESI-MS and LR-ESI-MS experiments. In addition, seven known compounds were isolated and identified as: palmitic acid, glycerol-2-linoleneate, glycerol-1,3-dilinoleneate, ferulic acid, 3-O-methylquercetin, β-sitosterol, and β-sitosterol-3-O-β-d-glucopyranoside. Nine fatty acids were identified and quantified in the saponifiable matter of the hexane extract. These fatty acids are: myristic, n-pentadecanoic, palmitoleic, palmitic, linoleic, oleic, stearic, arachidic, and behenic acids. The volatile oil was isolated by hydrodistillation (0.013%, w/w) with unpleasant smell. Twenty-seven components were identified in the oil by GC/MS.     

Bioactive flavonoids and saponins from Climacoptera obtusifolia

Two bidesmosidic saponins were isolated from Climacoptera obtusifolia (Chenopodiaceae) and their structures were determined as gypsogenin 3-O-[beta-D-xylopyranosyl-(1-->3)-beta-D-glucopyranoside]-28-O-{beta-D-glucopyranosyl} ester (1) and hederagenin 3-O-[beta-D-xylopyranosyl-(1-->3)-beta-D-glucopyranoside]-28-O-[beta-D-glucopyranosyl} ester (2), by spectroscopic methods. Two known compounds, isorhamnetin 3-O-beta-D-glucopyranoside (3), and isorhamnetin 3-O-[alpha-L-rhamnopyranosyl-(1-->6)-beta-D-glucopyranoside (4) were also isolated for the first time from this plant. Compounds 1-4 were tested in various immunomodulatory assays. Compound 2 suppressed (92%) the reactive oxygen species (ROS) production on mononuclear cells in luminol-based chemiluminescence (CL) assay at a higher concentration (50 microg/mL). Compounds 3 and 4 demonstrated a strong inhibition on ROS production in the oxidative burst activity of whole blood, neutrophils, and mononuclear cells. Additionally compounds 3 and 4 also suppressed PHA T-cell proliferation with no cytotoxic effects.     

鞑靼滨藜挥发性化学成分分析

对鞑靼滨藜全草的挥发性化学成分进行分析。采用水蒸气蒸馏法及索氏提取法提取鞑靼滨藜全草中的挥发性化学成分,用GC-MS联用技术分析其化学组成,计算其相对百分含量,并对两种提取方法进行比较研究。结果表明:水蒸气蒸馏法提取物的成分比索氏提取法较多。从水蒸气蒸馏法分离出的53个色谱峰中鉴定了51种成分,含量最高的是茴香脑(45.84%),其次为正二十七烷(9.28%),羟基吲哚(6.81%),α-羟基-2-甲基丙基苯乙酸酯(4.03%)。从索氏提取法分离出的26个色谱峰中鉴定了22种成分,含量最高的是正二十九烷(22.63%),其次为硬酯酸(16.69%),十六醛(6.89%),棕榈酸(5.43%)。     

鞑靼滨藜地上部分化学成分的研究

从鞑靼滨藜（Atriplex tatarica）首次分离得到6个化合物,通过理化及波谱分析,它们分别确定为苜素（tricin,1）,苜蓿素-7-O-β-D-吡喃葡萄糖苷（tricin 7-O-β-D-glucopyranoside,2）,异鼠李素（isorhanmetin,3）,异鼠李素．3-芸香糖甙（Isorhamnetin-3-rutinoside,4）,豆甾醇（stigmasteml,5）,β-谷甾醇（β-sitosterol,6）。