7-甲氧基香豆素-3-羧酸-N-琥珀酰亚胺酯用于神经肽的标记与分析  

Labeling Analysis of Neuropeptides with 7-Methoxycoumarin-3-carboxylic Acid N-Succinimidyl Ester

作　　者：李军[1] 刘祥军[1] 赵睿[1] 熊少祥[1] 马会民[1] 吕强[2] 许莉[2] 

机构地区：[1]中国科学院化学研究所,北京100080 [2]北京微量化学研究所,北京100091

出　　处：《高等学校化学学报》2006年第12期2297-2299,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20552517;20435030);中国科学院知识创新重要方向项目(批准号:KJCXZ-SW-H06)资助.

摘　　要：Labeling analysis of three neuropeptides（Met-enkephalin, Leu-enkephalin, and neurotensin） with 7-methoxycoumarin-3-carboxylic acid N-succinimidyl ester（MCSE） was investigated. The experimental conditions for labeling reaction and HPLC analysis of the neuropeptide derivatives were optimized. It was found that the labeling reatction could be achieved at 37 ℃ for one hour in H3BO3-NaCl-Na2B4O7 buffer（pH=8.3） with a labeling ratio of about 80%. The derivative mixture from the three peptides can be separated in a 40 min linear gradient from 60% to 20% of solvent A（100 mmol/L sodium acetate, pH=5.0） and from 40% to 80% of solvent B[60%（volume fraction） acetonitrile in water]. The resulting labeled products were also confirmed by MALDI-TOF-MS analysis. Compared with the native neuropeptides, the resulting labeled products have a longer absorption and fluorescence wavelengths, which is beneficial to the effective elimination of background fluorescence interference from biological matrix.Labeling analysis of three neuropeptides（ Met-enkephalin, Leu-enkephalin, and neurotensin） with 7-methoxycoumarin-3-carboxylic acid N-succinimidyl ester（MCSE） was investigated. The experimental conditions for labeling reaction and HPLC analysis of the neuropeptide derivatives were optimized. It was found that the labeling reatction could be achieved at 37℃ for one hour in H3BO：NaCl-Na2B4O7 buffer（pH = 8.3） with a labeling ratio of about 80%. The derivative mixture from the three peptides can be separated in a 40min linear gradient from 60% to 20% of solvent A（100 mmoL/L sodium acetate, pH =5.0） and from 40% to 80% of solvent B [ 60% （volume fraction） acetonitrile in water ]. The resulting labeled products were also confirmed by MALDI-TOF-MS analysis. Compared with the native neuropeptides, the resulting labeled products have a longer absorption and fluorescence wavelengths, which is beneficial to the effective elimination of background fluorescence interference from biological matrix.

关 键 词：神经肽 标记分析 7-甲氧基香豆素-3-羧基-N-琥珀酰亚胺酯 

分 类 号：O657[理学—分析化学]