奎宁酸系金鸡纳树皮、咖啡的种子,苹果、桃子等的果实中含量很多的高等植物特有的脂环族有机酸,普遍分布于维管束植物,常与莽草酸共存。
在此基础上删除ydiB基因,阻止了莽草酸合成的前体物质3-脱氢奎宁酸转化为副产物奎宁酸(Quinic acid,QA),进一步提高了莽草酸的累积。初步发酵显示4个基因缺失的大肠杆菌代谢工程菌生产莽草酸的能力比原始菌提高了90多倍。
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已测出了忍冬叶中绿原酸和总咖啡酰奎宁酸的含量。
The contents of chlorogenic acid and total caffeoylquinic acid in Folium Lonicerae had been determined.
结果:测定了川渝6种忍冬叶中绿原酸和总咖啡酰奎宁酸的含量。
Results: The contents of chlorogenic acid and total caffeoylquinic acid in 6 Folium Lonicerae had been determined.
咖啡淡淡的酸味来自于此。往好的看,奎宁酸是合成抗感冒药达菲的起始原料化合物之一。
Gives coffee its slightly sour flavor. On the plus side, it's one of the starter chemicals in the formulation of Tamiflu.
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