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The photolysis of musk ketone in cyclohexane and methanol afforded several cyclization products while the product spectrum in cyclohexene and squalene was characterized by an amino derivative and a ring expansion product, respectively. On cellulose stearate layers the photochemical reactions of musk ketone proceeded readily both under sun simulator and in natural sunlight and several photoproducts identified in solvent experiments were detected. Photoproducts were isolated by preparative HPLC and TLC and analyzed by means of HPLC, GC/MS, MS, LC/MS, 1H‐ and 13C‐NMR. 相似文献
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中药青蒿鲨烯合酶的大肠杆菌表达、纯化与功能鉴定 总被引：3，自引：0，他引：3
利用PCR方法,将经RACE方法克隆到的中药青蒿鲨烯合酶cDNA(AF302464)开放阅读框的3′末端截短99bp,插入到原核表达载体pET30a( )的NcoⅠ和BamHⅠ酶切位点之间,构建N端和C端均携带有HIS6表达标签的鲨烯合酶重组表达载体pETSSA.将pETSSA转入大肠杆菌BL21(DE3),0.5mmol/LIPTG(isopropyl-beta-D-thiogalactoside)28℃诱导重组鲨烯合酶的表达.表达产物经镍琼脂糖柱纯化.纯化蛋白加入酶促反应体系(含FPP和NADPH),GC-MS分析酶促反应体系的正己烷萃取物,结果显示重组鲨烯合酶可以催化FPP向鲨烯的转化.青蒿鲨烯合酶的功能鉴定为进一步利用反义或RNAi技术限制甾类生物合成,从而提高青蒿中的青蒿素含量提供了基础.图5参15 相似文献
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