1 引言 利用两水相体系作为生物反应器进行生物转化反应,或者提取生物大分子,近年来受到国内外关注。聚乙二醇(PEG)-葡聚糖(Dextran)是最常用的两水相体系,在实际应用中,了解上下两相的组成是十分必要的,因此,建立合适的测定两水相体系的方法是研究和应用两水相体系的基础工作。本文用分光光度法测定PEG 1 Introduction The use of two aqueous systems as bioreactors for bioconversion reactions, or for the extraction of biological macromolecules, has attracted worldwide attention in recent years. Dextran is the most commonly used two-phase aqueous system. In practical applications, it is necessary to understand the composition of the upper and lower phases. Therefore, it is necessary to establish a suitable The method is to study and apply the basic work of the two-phase system. In this paper, spectrophotometric determination of PEG