Effect of Processed Oils and Fats on Cholesterol Metabolism. VII

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  • 加工油脂のコレステロール代謝に及ぼす影響 (第7報)
  • カコウ ユシ ノ コレステロール タイシャ ニ オヨボス エイキョウ 7 パー
  • Effects of Palm Oil, Palm Mid Fraction, and Palm Super Olein
  • パーム油, パーム中融点画分およびパームスーパーオレインの影響

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Abstract

Four groups of male rats were fed diets containing 20 % (by weight) palm oil, palm middle fraction (PMF) by dry-fractionation, palm super olein (PSO) by double-dry-fractionation and soybean oil as the control, for 28 d. Comparative studies were made on serum lipids, cholesterol and its metabolites in tissues and feces from the rats. The physical and chemical properties of dietary fats were also examined.<BR>1) As major components, PMF contained mono oleoyl dipalmitin (POP) and mono palmitoyl diolein (P00), and PSO contained POO, POP and palmitoyl linoleoyl alein (PLO). Compared with palm oil, PMF showed more solid fat content (SFC) at 5°C and less SFC at temperature exceeding 20°C, the reason being that PMF contained more 2-oleoyl-1, 3-disaturated acylglycerols and less saturated triacylglycerols with the highest melting point. SFC of PSO showed 0 % at 5°C owing to the presence of more monosaturated-diunsaturated acylglycerols whosemelting points were low.<BR>2) All four groups were essentially the same in cholesterol content in serum (total and HDL), liver and adipose tissue. Analysis of fatty acids in fecal lipids indicated the apparently preferential excretion of palmitic acid into feces in the PMF and PSO groups, as was also noted for the palm oil group.<BR>3) Cholesterol content in feces from the PMF and PSO groups was basically the same as that in palm oil group, but less than that in the control group. This was also noted for coprostanol, lathosterol and some bile acids. The ratio of total metabolites/cholesterol in feces was essentially the same in all groups.<BR>4) The effects of PMF and PSO on cholesterol metabolism are shown by the present results to be equivalent to those of palm oil, and possibly the same as those of soybean oil.

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