赤小豆化学成份

  赤小豆化学成份

  赤豆种子含蛋白质为α-、β-球朊(α-、β-globulin)约20%、脂肪0.75%、脂肪酸约0.71%及皂甙约0.27%、淀粉、菸酸、糖类、维生素A、B1、B2,植物甾醇和色素。尚含三萜皂甙类。

  1.赤小豆 含糖类,三萜皂甙(triterpenoidsaponin)。每百克含蛋白质20.7g,脂肪0.5g,碳水化物58g,粗纤维4.9灰分3.3g,钙67mg,磷305mg,铁5.2mg,硫胺素(thiamine)0.3lmg,核黄素(riboflavine)0.11mg,烟酸(nicotinicacid)2.7mg等。

  2.从赤豆中分离得到3-呋喃甲醇-β-D-吡喃葡萄糖甙(3-fu-ranmethanol-β-D-hlucopyranoside),右旋儿茶精-7-O-β-D吡喃葡萄糖甙(catechin-7-O-β-D-glucopyranoside)和1D-5-O-(a-D-吡喃半乳糖基)-4-O-甲基肌醇[1D-5-O(a-D-galactopyranosyl)-4-O-methyl-myoinositol]。还分离得到6个齐墩果烯低聚糖甙(oleanene-oligoglycosides):赤豆皂甙(azukisaponin)Ⅰ,即是3-O-[β-D-吡喃葡萄糖基(1→2)-β-D-吡喃葡萄糖醛酸基]槐花二醇{3-O-[β-D-glucopyranosyl(1→2)-β-D-glucuronopyranosyl] sophoradiol};赤豆皂甙Ⅱ,即是3-O-[β-D-吡喃葡萄糖基(1→2)-β-D-吡喃葡萄糖醛酸基]大豆皂醇B{3-O[β-D-glucopyranosyl(1→2)-β-D-glucuronopyranosyl]soyasapogenol B};赤豆皂甙Ⅲ,即是3-O-[β-D-吡喃葡萄糖基(1→2)-β-D-吡喃葡萄糖醛酸基]赤豆皂醇{3-O-[β-D-glucopyranosyl(l→2)-β-D-glucuronopyranosyl]azukisa-pogenol};赤豆皂甙Ⅳ,即是3-O[β-D-吡喃葡萄糖基-28-O-吡喃葡萄糖基(l→6)-β-D-吡喃葡萄糖基]刺叶丝石竹酸{3-O-(β-D-glucopyranosyl)28-D-glucopyranosyl(1→6)-β-D-glucopyranosyl] gypsogenic acid};赤豆皂甙Ⅴ,即是3-O-[a-L-吡喃鼠李糖基(l→2)-β-D-吡喃葡萄糖基(1→2)-β-D-吡喃葡萄糖醛酸基]大豆皂醇B{3-O-[a-L-rhamnopyranosyl(1→2)-β-D-glucopyra-nosyl(l→2)-β-D-glucuronopyranosyl]-soyasapogenol B}和赤豆皂甙Ⅵ,即是3-O-[β-D吡喃葡萄糖基(1→2)β-D-吡喃葡萄糖醋酸基]-29-O-[β-D-吡喃葡萄糖基(1→6)-β-D-吡喃葡萄糖基]赤豆皂醇{3-O-[β-D-glucopyranosyl(1→2)β-D-glucuropyranosyl]-29-O-[β-D-glucopyranosyl(1→6)-β-D-glucopyranosyl]azukisapogenol}。

  从赤豆的热水提取物中还得到三种黄烷醇鞣质(flavanoltannins):D-儿茶精(D-catechin)、D-儿茶精(D-epicatechin)和表没食子儿茶精(epigallocatechin)。从新鲜种子中分离到原矢车菊素(procyanidin)B1和B3。