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This research was supported by the National Institutes of Health (GM 30367). J.E.H. was supported by a postdoctoral fellowship granted by the Deutsche Forschungsgemeinschaft in 1991. K.W.W. was an NSF postdoctoral fellow (CHE-90-02653).

Polysorbate 80 autoxidation follows the classical rate law and is largely dependent on the unsaturated fatty acid ester substituents. Clarification of the substituents' roles will aid formulators in the selection of appropriate polysorbates to minimize oxidative liabilities.

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