HPLC-MS法测定食品中生物碱的研究
2012-09-11秦军燕夏寅强瞿德敬方国臻
秦军燕,陈 文,夏寅强,瞿德敬,方国臻,王 硕
(天津科技大学食品工程与生物技术学院,食品营养与安全教育部重点实验室,天津300457)
HPLC-MS法测定食品中生物碱的研究
秦军燕,陈 文,夏寅强,瞿德敬,方国臻,王 硕*
(天津科技大学食品工程与生物技术学院,食品营养与安全教育部重点实验室,天津300457)
建立了一种高效液相色谱电喷雾质谱(HPLC-ESI-MS)法同时测定食品中六种生物碱的方法。采用ZORBAX SB-C8(2.1mm×150mm,3.5μm)色谱柱,乙腈(A)和pH5的4mmol/L乙酸铵溶液(B)为流动相,梯度洗脱使所有分析物均达到基线分离。采用ESI+一级质谱扫描模式得到甜菜碱、胆碱、苦参碱、阿托品、马钱子碱和乌头碱的定性离子,分别为m/z 118.2、104.2、249.5、290.3、395.4和646.4,结合质谱保留时间检测六种生物碱。结果表明,采用1.0mg/mL混合标准溶液,准确性好,RSD<0.59%。该方法应用于检测实际样品荒漠肉苁蓉、山药、宁夏枸杞,添加回收率分别为81.7%~112.9%、80.8%~117.5%、96.9%~119.3%,说明建立的方法可以快速准确的检测实际样品中的生物碱成分。
高效液相色谱,电喷雾质谱,生物碱,实际样品
Abstract:An high-performance liquid chromatographic electrospray ionization mass spectrometry(HPLC-ESIMS) method was developed for the identification of 6 alkaloids in food.A mixture of acetonitrile(A) and pH5 4mmol/L ammonium acetate aqueous solution(B) were used as the mobile phase for the chro-matographic separation on ZORBAX SB-C8(2.1mm×150mm,3.5μm) column in the gradient elution mode.Under positive electrospray ionization mode,the protonated molecular[M+H]+ions for betaine(m/z 118.2),choline(m/z 104.2),matrine(m/z 249.5),atropine(m/z 290.3),brucine(m/z 395.4) and aconitine(m/z 646.4) and retain time were obtained as qualitative analysis.The experiment results indicated that RSD of the precision was less than 0.59%for adding 1.0mg/mL of spike standard.This method was used in the actual sample Herba Cistanche,Rhizoma Dioscoreae,Lycium bar-barum L testing and the average extraction recoveries were in the range of 81.7%~112.9%,80.8%~117.5%,96.9%~119.3%.A simple,rapid and accurate identification of 6 alkaloids was successfully achieved using the method.
Key words:liquid chromatography;electrospray ionization mass spectrometry;alkaloids;actual sample
肉苁蓉、枸杞和山药既是名贵的中药材,又是食疗同源的滋补产品,具有抗肿瘤、增强人体免疫力及维护心血管健康等功效。根据报道枸杞、肉苁蓉和山药均含有大量活性成分生物碱[1-4],目前对该成分的检测方法有比色法[5]、高效液相色谱法[6-8]、液相质谱联用法[9-11]等。比色法测定过程复杂,而且需要乙醚等有机试剂,对人体危害较大。由于甜菜碱和胆碱结构中无共轭体系,高效液相色谱法仅能在低紫外吸收波长条件下测定,条件要求较高,灵敏度不够理想,或是衍生操作相对繁琐。……
