Determination of polyethylene glycols by precipitation with iodine.
Two methods for the determination of polyethylene glycols (PEGs) in aqueous solution by precipitation with iodine have been developed. For PEGs with molecular weight 4 x 10(3)-2 x 10(4) the excess of iodine is titrated with thiosulphate, and for PEGs with average m.w. > 2 x 10(4) turbidimetric measurement is used. Both methods are relatively simple and give accurate and reproducible results.
Francois
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Laboratorium Galenische en Magistrale Farmacie, Medische en Speciale Biochemie, Vrije Universiteit Brussel, Laarbeeklaan, 103, 1090 Brussels, Belgium.
De Neve
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