Villaverde J J, Domingues R M A, Freire C S R, Silvestre A J D, Neto C Pascoal, Ligero P, Vega A
Department of Physical Chemistry and Chemical Engineering, University of A Coruña, Spain.
J Agric Food Chem. 2009 May 13;57(9):3626-31. doi: 10.1021/jf900071t.
The chemical composition of the lipophilic extracts of bark and core, of the Miscanthus x giganteus stalk, was studied by gas chromatography-mass spectrometry (GC-MS). Aromatic compounds, sterols, and fatty acids, followed by long-chain fatty alcohols, were the major families of components present in the M. x giganteus stalk. Aromatic compounds are more abundant in the M. x giganteus bark (521 mg/kg of bark), with vanillic acid, vanillin, and p-hydroxybenzaldehyde as the major compounds of this family. In the M. x giganteus core, sterols represent about 949 mg/kg of dry core with beta-sitosterol, 7-oxo-beta-sitosterol, stigmasterol, and campesterol as the major components. The detection of small amounts of esters in the GC-MS analysis with short columns explains the small increase in the abundance of the identified families after alkaline hydrolysis. The high content of valuable sterols and aromatic compounds in M. x giganteus and, particularly, in the core, which is considered a residue in most applications, can open new perspectives for the integrated upgrading of this grass within the biorefinery perspective.
采用气相色谱 - 质谱联用（GC-MS）技术研究了巨芒麦秸秆树皮和髓部亲脂性提取物的化学成分。芳香族化合物、甾醇和脂肪酸，其次是长链脂肪醇，是巨芒麦秸秆中主要的成分类别。芳香族化合物在巨芒麦树皮中含量更高（每千克树皮含521毫克），香草酸、香草醛和对羟基苯甲醛是该类别中的主要化合物。在巨芒麦髓部，甾醇含量约为每千克干髓部949毫克，主要成分是β-谷甾醇、7-氧代-β-谷甾醇、豆甾醇和菜油甾醇。使用短柱进行GC-MS分析时检测到少量酯类，这解释了碱性水解后已鉴定成分类别的丰度略有增加的原因。巨芒麦，尤其是髓部中含有高含量的有价值的甾醇和芳香族化合物，而髓部在大多数应用中被视为残渣，这可为从生物炼制角度对这种草进行综合升级开辟新的前景。
