A facile micellar electrokinetic chromatography(MEKC) method was developed for quantification of aromatic amino acids in Cordyceps fungi. The proposed MEKC method had linear calibration curves and detection limits at ...A facile micellar electrokinetic chromatography(MEKC) method was developed for quantification of aromatic amino acids in Cordyceps fungi. The proposed MEKC method had linear calibration curves and detection limits at the μmol/L level. Contents of aromatic amino acids in Cordyceps were found in the range from 0.004 9 % to 0.028 0% for tryptophan(Trp), 0.036 6% to 0.078 1% for tyrosine(Tyr), and 0.029 1% to 0.136 2% for phenylalanine(Phe). Levels of amino acids in cultivated Cordyceps militaris were found higher than those in natural Cordyceps sinensis. Interestingly, the ratio of Tyr to its precursor, Phe, in C. sinensis(1.20 ± 0.091, n=3) was significantly higher than that in cultivated C. militaris(0.54 ± 0.170, n=3). This is likely because the enzyme-catalyzed in vivo biotransformation of Phe to Tyr is much more effective in natural C. sinensis, a biological hybrid of larva and parasitic fungus, than in cultivated C. militaris.展开更多
建立了一种利用胶束电动毛细管色谱-间接紫外检测法同时测定丙二酸、甲酸、酒石酸、苹果酸、琥珀酸、戊二酸、乙酸、乳酸和谷氨酸的新方法。以7.5mm o l/L邻苯二甲酸氢钾-1.5mm o l/L十六烷基三甲基溴化铵(用0.1m o l/L氢氧化钠调pH至6....建立了一种利用胶束电动毛细管色谱-间接紫外检测法同时测定丙二酸、甲酸、酒石酸、苹果酸、琥珀酸、戊二酸、乙酸、乳酸和谷氨酸的新方法。以7.5mm o l/L邻苯二甲酸氢钾-1.5mm o l/L十六烷基三甲基溴化铵(用0.1m o l/L氢氧化钠调pH至6.50)混合液作为电泳介质,检测波长为300nm,参比波长为210nm,未涂层弹性石英毛细管(50μm i.d.×64cm)为分离通道,在6m in内实现了9种酸的完全分离。9种有机酸的浓度与其峰面积在一定的范围呈良好的线性关系,检出限均低于1.5m g/L,迁移时间和峰面积的日内、日间相对标准偏差均小于6%。该法用于糖蜜酒精废液中有机酸的测定,结果令人满意,9种有机酸的样品加标回收率均在93%以上。展开更多
基金Supported by Zhongnan Hospital of Wuhan University Science,Technology,and Innovation Seed Fund(cxpy2017023)the TCM Research Project of Hubei Provincial Health Commission(ZY2019M033)
文摘A facile micellar electrokinetic chromatography(MEKC) method was developed for quantification of aromatic amino acids in Cordyceps fungi. The proposed MEKC method had linear calibration curves and detection limits at the μmol/L level. Contents of aromatic amino acids in Cordyceps were found in the range from 0.004 9 % to 0.028 0% for tryptophan(Trp), 0.036 6% to 0.078 1% for tyrosine(Tyr), and 0.029 1% to 0.136 2% for phenylalanine(Phe). Levels of amino acids in cultivated Cordyceps militaris were found higher than those in natural Cordyceps sinensis. Interestingly, the ratio of Tyr to its precursor, Phe, in C. sinensis(1.20 ± 0.091, n=3) was significantly higher than that in cultivated C. militaris(0.54 ± 0.170, n=3). This is likely because the enzyme-catalyzed in vivo biotransformation of Phe to Tyr is much more effective in natural C. sinensis, a biological hybrid of larva and parasitic fungus, than in cultivated C. militaris.
文摘建立了一种利用胶束电动毛细管色谱-间接紫外检测法同时测定丙二酸、甲酸、酒石酸、苹果酸、琥珀酸、戊二酸、乙酸、乳酸和谷氨酸的新方法。以7.5mm o l/L邻苯二甲酸氢钾-1.5mm o l/L十六烷基三甲基溴化铵(用0.1m o l/L氢氧化钠调pH至6.50)混合液作为电泳介质,检测波长为300nm,参比波长为210nm,未涂层弹性石英毛细管(50μm i.d.×64cm)为分离通道,在6m in内实现了9种酸的完全分离。9种有机酸的浓度与其峰面积在一定的范围呈良好的线性关系,检出限均低于1.5m g/L,迁移时间和峰面积的日内、日间相对标准偏差均小于6%。该法用于糖蜜酒精废液中有机酸的测定,结果令人满意,9种有机酸的样品加标回收率均在93%以上。
