Methyl Caffeate as an α-Glucosidase Inhibitor from<i>Solanum torvum</i>Fruits and the Activity of Related Compounds
作者:Keisuke TAKAHASHI、Yasuyuki YOSHIOKA、Eisuke KATO、Shigeki KATSUKI、Osamu IIDA、Keizo HOSOKAWA、Jun KAWABATA
DOI:10.1271/bbb.90789
日期:2010.4.23
In screening experiments for rat intestinal α-glucosidase (sucrase and maltase) inhibitors in 325 plants cultivated in Japan’s southern island, of Tanegashima, marked inhibition against both sucrase and maltase was found in the extract of the fruit of Solanum torvum. Enzyme-assay guided fractionation of the extract led to the isolation of methyl caffeate (1) as a rat intestinal sucrase and maltase inhibitor. We examined 13 caffeoyl derivatives for sucrase- and maltase-inhibitory activities. The results showed that methyl caffeate (1) had a most favorable structure for both sucrase and maltase inhibition, except for a higher activity of methyl 3,4,5-trihydroxycinnamate (14) against sucrase. Its moderate inhibitory action against α-glucosidase provides a prospect for antidiabetic usage of S. torvum fruit.
在日本南岛种子岛栽培的325种植物中,筛选大鼠肠道α-葡萄糖苷酶(蔗糖酶和麦芽糖酶)抑制剂的实验发现,茄属植物Solanum torvum果实提取物对蔗糖酶和麦芽糖酶均有显著抑制作用。通过酶活性导向的提取物分级分离,得到了作为大鼠肠道蔗糖酶和麦芽糖酶抑制剂的咖啡酸甲酯(1)。我们检测了13种咖啡酸衍生物对蔗糖酶和麦芽糖酶的抑制活性。结果显示,咖啡酸甲酯(1)在蔗糖酶和麦芽糖酶抑制方面具有最优的结构,除了对蔗糖酶活性更高的3,4,5-三羟基肉桂酸甲酯(14)外。其对α-葡萄糖苷酶的中等抑制作用为Solanum torvum果实的抗糖尿病用途提供了前景。