A Study on High Speed Liquid Chromatography in the Cosmetic Analysis. III.

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  • 高速液体クロマトグラフィーの化粧品分析への応用 (第3報)
  • コウソク エキタイ クロマトグラフィー ノ ケショウヒン ブンセキ エ ノ オ
  • Analysis of Polyethylene Glycol in Ethylene Oxide Adduct Nonionic Surfactants
  • 非イオン界面活性剤中の副成ポリエチレングリコールの分析

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Average molecular weights and molecular distributions of polyethylene glycol (PEG) as a byproduct in ethylene oxide adduct nonionic surfactants (EO-SAA) were studied by gel permeation chromatography (GPC). <BR>Every PEG were perfectly separated from various EO-SAA through the reversed-phase column chromatography. <BR>Standard PEG (n=5, 6, 7, 8, 9, and 10) were isolated from the commercial PEG 300 by recycle GPC and the purities of them were identified by GC. Average molecular weights per 1 Å of them were found to be calculated as 24 by making that of polystylene as 41. <BR>By using this value, the chromatograms of each PEG, the calibration curve of standard polystylene and a curve-reader CPU system, the average molecular weights of PEG in EO-SAA could be easily determined. <BR>The average molecular weights of isolated PEG in EO-SAA of ether type were shown to be almost constant values, while those in ester type were dependent on the EO molecular numbers of the original EO-SAA. The values of those in Tween type EO-SAA coincided with those of the average 20 molecular numbers of EO-SAA of ester type. <BR>Further, the molecular distributions of various commercial PEG were also presented in this paper.

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