A method for quantitative analysis of low molecular weight components which are contained in a protein-containing liquid sample originating from body fluids and are capable of binding to said protein, characterized by incorporating into the liquid sample a compound having the formula (I): X--(Y).sub.p --SO.sub.3 M (I) in which M is hydrogen ion, an alkali metal ion, or ammonium ion; X is a straight or branched alkyl, alkenyl, fluorinated alkyl, or fluorinated alkenyl group containing at least 6 carbon atoms, Y is a divilent organic residue; and p is 0 r 1. The compound represented by formula (I) liberates thyroid hormone from bound protein to facilitate analysis.
一种用于定量分析含有蛋白质的液体样品中低分子量组分的方法,这些组分可以与所述蛋白质结合,其特征在于将具有以下式子(I)的化合物(I)引入到液体样品中:X--(Y).sub.p --SO.sub.3 M(I),其中M为氢离子、碱
金属离子或
铵离子;X为至少含有6个碳原子的直链或支链烷基、烯基、
氟代烷基或
氟代烯基;Y为二价有机残基;p为0或1。式(I)所代表的化合物可以使甲状腺激素从结合的蛋白质中释放出来,以便于分析。