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Parameters influencing cholesterol oxidation

S K Kim1, W W Nawar

  • 1Department of Food Science, University of Massachusetts, Amherst 01003.

Lipids
|October 1, 1993
PubMed
Summary
This summary is machine-generated.

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Cholesterol oxidation is influenced by temperature and substrate form. Melting solid cholesterol or using aqueous suspensions accelerates oxidation, with pH affecting product ratios.

Area of Science:

  • Biochemistry
  • Food Chemistry

Background:

  • Cholesterol oxidation is a critical process in food science and biological systems.
  • Understanding factors influencing cholesterol oxidation is vital for food preservation and health research.

Purpose of the Study:

  • To investigate the impact of temperature, oxidation time, water presence, pH, buffer type, and substrate form on cholesterol oxidation.
  • To analyze the autoxidation products and their decomposition pathways.

Main Methods:

  • Utilized microcrystalline cholesterol films (solid and melted) and aqueous suspensions of film fragments as substrates.
  • Employed gas chromatography for quantitative analysis of cholesterol and its autoxidation products.
  • Controlled variables including temperature, pH, and oxidation time.

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Main Results:

  • Solid cholesterol films exhibited resistance to dry autoxidation but rapidly oxidized upon melting at 125°C.
  • Cholesterol oxidized faster in aqueous suspensions compared to dry states.
  • pH significantly affected the ratio of 7-ketocholesterol to 7-hydroxycholesterol, and favored cholesterol beta-epoxide formation at pH 7.4.

Conclusions:

  • Cholesterol's oxidation rate is highly dependent on its physical state and the presence of water.
  • pH plays a crucial role in modulating the types and ratios of cholesterol oxidation products.
  • Further decomposition of oxidation products occurs, indicating complex reaction pathways.