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蛋白质和肽中氨基的测定。

The measurement of amino groups in proteins and peptides.

作者信息

Fields R

出版信息

Biochem J. 1971 Sep;124(3):581-90. doi: 10.1042/bj1240581.

Abstract

A technique is examined for determining amino groups with 2,4,6-trinitrobenzenesulphonic acid, in which the extinction at 420nm of sulphite complexes of the trinitrophenylated amino groups is measured. The sensitivity of the method is 5-200nmol of amino group. The method is especially suitable for checking the extent of blocking or unblocking of amino groups in proteins and peptides, owing to the short time required for reaction (5min at room temperature). The reaction of the reagent with thiol groups has been studied and was found to proceed 30-50 times faster than with in-amino groups of model compounds. The in(420) of a trinitrophenylated thiol group was found to be 2250m(-1).cm(-1). The reaction with several amino acids, peptides and proteins is presented. The in(420) of a typical alpha-amino group was found to be 22000m(-1).cm(-1) and that of an in-amino group, 19200m(-1).cm(-1). Difficulties inherent in the analysis of constituent amino group reactions in proteins are discussed.

摘要

研究了一种用2,4,6-三硝基苯磺酸测定氨基的技术,该技术通过测量三硝基苯基化氨基的亚硫酸盐络合物在420nm处的吸光度来进行。该方法的灵敏度为5-200nmol氨基。由于反应所需时间短(室温下5分钟),该方法特别适用于检测蛋白质和肽中氨基的封闭或去封闭程度。研究了该试剂与巯基的反应,发现其反应速度比与模型化合物的内氨基反应快30-50倍。发现三硝基苯基化巯基的ε(420)为2250m⁻¹·cm⁻¹。给出了该试剂与几种氨基酸、肽和蛋白质的反应情况。发现典型α-氨基的ε(420)为22000m⁻¹·cm⁻¹,内氨基的ε(420)为19200m⁻¹·cm⁻¹。讨论了蛋白质中组成氨基反应分析中固有的困难。

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