Polyethylene glycol monoesters on standing rearrange to form diesters. The formation of diester in monoester samples stored at 3 C, 25 C, and 37 C, respectively, for approximately 3 months was determined by reverse phase high performance liquid chromatography (HPLC) in less than one‐half hour. Formation of diester increased with increasing storage temperature, regardless of the chemical nature of the
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Parris et al. (1979) studied this question.
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