Département de Nutrition et Sciences Alimentaires, Université d'Abomey-Calavi , 01 BP 526 Cotonou, Benin.
J Agric Food Chem. 2011 Feb 23;59(4):1178-84. doi: 10.1021/jf103963t. Epub 2011 Jan 25.
Extracts from leaf sheaths of farmers' varieties of dye sorghum cultivated and used in Benin as a source of biocolorings were analyzed for their anthocyanidin and phenolic contents, as well as their antioxidant capacity. The aim was to identify and quantify the types of anthocyanin and phenolic acids. The total anthocyanin content of the leaf sheaths ranged from 13.7 to 35.5 mg of cyanidin 3-glucoside equivalent/g of dry matter (DM), with an average of 27.0 mg/g. The total anthocyanin content is 90 times higher than levels usually reported in fruits and vegetables. Anthocyanin consisted essentially of apigeninidin and luteolinidin, two 3-deoxyanthocyanidins with many applications in food, beverage, and pharmaceutical industries. The apigeninidin content of the leaf sheaths was 30 times higher than that in cereal bran and ranged from 14.7 to 45.8 mg/g, with an average of 31.3 mg/g. The amount of luteolinidin ranged from 0.4 to 2.4 mg/g, with a mean of 1.2 mg/g. The total phenolic content expressed as gallic acid equivalent averaged 95.5 mg/g. The free phenolic acids identified were benzoic acid, p-coumaric acid, and o-coumaric acid at amounts of 801.4, 681.6, and 67.9 μg/g, respectively. The leaf sheaths of dye sorghum have an antioxidant capacity [3.8-5.6 mmol of Trolox equivalent (TE)/g of DM] much higher than that reported for cereal bran and fruits and vegetables.
从在贝宁种植和使用的农民品种的叶鞘中提取了用于生物染色的染料高粱，对其花色苷和酚类物质含量以及抗氧化能力进行了分析。目的是鉴定和定量花色苷和酚酸的类型。叶鞘的总花色苷含量在 13.7 至 35.5mg 矢车菊素 3-葡萄糖苷当量/g 干物质（DM）之间，平均为 27.0mg/g。总花色苷含量比通常在水果和蔬菜中报道的水平高 90 倍。花色苷主要由芹菜素和木犀草素组成，这两种 3-去氧花色苷在食品、饮料和制药行业有许多应用。叶鞘中的芹菜素含量比谷物麸皮高 30 倍，在 14.7 至 45.8mg/g 之间，平均为 31.3mg/g。木犀草素的含量在 0.4 至 2.4mg/g 之间，平均为 1.2mg/g。以没食子酸当量表示的总酚含量平均为 95.5mg/g。鉴定出的游离酚酸有苯甲酸、对香豆酸和邻香豆酸，含量分别为 801.4、681.6 和 67.9μg/g。染料高粱的叶鞘具有很高的抗氧化能力[3.8-5.6mmol Trolox 当量（TE）/g DM]，远高于谷物麸皮和水果和蔬菜报道的抗氧化能力。
