By virtue of nicotinic acid as precursor compound,N saccinimidylnicotinizute has been synthesized through eletrophilic reaction and then esterified,one kind of conjugate reagent adapted to all kinds of protein can be ...By virtue of nicotinic acid as precursor compound,N saccinimidylnicotinizute has been synthesized through eletrophilic reaction and then esterified,one kind of conjugate reagent adapted to all kinds of protein can be obtained.Moreover,a quick and convenient way of labell antibody has been established,combining this conjugate reagent with the technique of the fixed phrase separation.The rate of its protein labell thus reached could be over 30% averagely.展开更多
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 label...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.展开更多
文摘By virtue of nicotinic acid as precursor compound,N saccinimidylnicotinizute has been synthesized through eletrophilic reaction and then esterified,one kind of conjugate reagent adapted to all kinds of protein can be obtained.Moreover,a quick and convenient way of labell antibody has been established,combining this conjugate reagent with the technique of the fixed phrase separation.The rate of its protein labell thus reached could be over 30% averagely.
文摘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.
