Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC , P.O. Box 1052, E-41080 Seville, Spain.
J Agric Food Chem. 2012 Jun 27;60(25):6408-17. doi: 10.1021/jf301753w. Epub 2012 Jun 14.
The composition of lipophilic extractives in the cortex and pith of elephant grass ( Pennisetum purpureum Schumach.) stems was thoroughly studied by gas chromatography-mass spectrometry. The predominant compounds were fatty acids followed by sterols (in free and conjugated forms as esters and glycosides). Other steroid compounds, as steroid hydrocarbons and ketones, were also present. Additionally, important amounts of mono-, di-, and triglycerides were identified. Other aliphatic series such as n-alkanes, n-fatty alcohols, and n-alkyl ferulates, together with tocopherols and a series of high molecular weight esters, were also found, although in minor amounts. The analyses also revealed the presence of a β-diketone (12,14-tritriacontanedione), which was particularly abundant in the cortex. Finally, two lignans, matairesinol and syringaresinol, were also detected. In general terms, the abundances of the different classes of compounds were higher in the pith, except for the series of n-fatty alcohols, n-alkyl ferulates, β-diketones, and lignans, which were more prominent in the cortex.
通过气相色谱-质谱联用技术，对象草（Pennisetum purpureum Schumach.）茎的皮层和髓部的脂溶性抽提物的成分进行了深入研究。主要化合物为脂肪酸，其次为甾醇（以酯和糖苷形式的游离态和结合态）。还存在其他甾体化合物，如甾体烃和酮。此外，还鉴定出了重要数量的单、二和三酸甘油酯。还发现了其他脂肪族系列，如正烷烃、正脂肪醇和正烷基阿魏酸酯，以及生育酚和一系列高分子量酯，尽管含量较少。分析还表明存在β-二酮（12,14-三三十烷二酮），其在皮层中尤为丰富。最后，还检测到两种木脂素，马替瑞林和丁香树脂醇。一般来说，不同类化合物的丰度在髓部较高，除了正脂肪醇、正烷基阿魏酸酯、β-二酮和木脂素系列，它们在皮层中更为突出。
