摘要
建立一种检测大鼠脑组织中L-丝氨酸和D-丝氨酸的高效液相色谱—电喷雾离子化—质谱联用技术（HPLC-ESI-MS）的测定方法.大鼠脑组织样品匀浆及离心后,取上清液并加入Marfey试剂对样品中L/D-丝氨酸进行衍生化.HPLC流动相为甲酸铵和乙腈,梯度洗脱;质谱采用电喷雾离子源,在负离子模式下进行定性定量分析.结果显示,L-丝氨酸和D-丝氨酸在22 min内得以分离,在2.5～500 ng/mg和1.2～250 ng/mg浓度范围内分别与各自的色谱峰面积呈良好线性关系;L/D-丝氨酸的最低定量限分别为2.5 ng/mg和1.2 ng/mg,方法回收率均在81％～89％％范围内.本法具有省时快速,灵敏度和选择性高等优点.将此法运用于成年和老年大鼠海马及皮层中L-丝氨酸和D-丝氨酸含量测定,结果表明,与成年鼠相比,老年鼠海马和皮层中L-丝氨酸的含量基本不变,而D-丝氨酸含量则明显减少,提示D-丝氨酸的变化与正常的衰老过程密切相关.
A highly sensitive and selective high performance liquid chromatography-electrospray ionization-mass spectrometry （HPLC-ESI-MS） assay was developed for the determination of neurotransmitters L-serine/D-serine in rat brain tissues.The rat brain was removed,homogenized and centrifuged.L-serine/D-serine in the supernatant was derivatized with the Marfey＇s reagent.The derivatives were separated by HPLC under gradient elution of mobile phase consisting of ammonium formate and acetonitrile and detected by ESI-MS in the negative ion mode.Reverse phase chromatographic resolution of the enantiomers was obtained within 22 min.Good linear correlations of the concentration to the peak area were obtained in the ranges of 2.5～500 ng/mg for L-serine and 1.2～250 ng/mg for D-serine.The extraction recoveries for both analysts were in the range of 81 % to 89%.The method was then applied to determine the levels of the neurotransmitters in cerebral cortex and hippocampus of the adult and aged rats.The re.suits showed that L-serine levels kept unchanged,while D-serine levels decreased significantly,in cortex and hippocampus of the aged rats compared with those of the adult rats,suggesting an involvement of D-serine in the normal aging process.
出处
《华东师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第6期165-170,共6页
Journal of East China Normal University(Natural Science)
基金
国家自然科学基金(31171019,31200820)
脑功能基因组学教育部重点实验室,上海市脑功能基因组学重点实验室(华东师范大学)开放项目基金
