Horigome T, Sakaguchi E, Kishimoto C
College of Agriculture, Okayama University, Japan.
Br J Nutr. 1992 Jul;68(1):231-44. doi: 10.1079/bjn19920080.
The pulp of banana fruit (Musa sapientum L. var. Cavendishii) was examined for its cholesterol-lowering effect with male rats fed on a diet containing lard (50 g/kg) and cholesterol (5 g/kg). Freeze-dried banana pulp showed a marked cholesterol-lowering effect when incorporated into a diet at the level of 300 or 500 g/kg, while the banana pulp dried in a hot-air current (65 degrees) did not. Starch and tannin prepared from banana pulp were not responsible for the cholesterol-lowering effect. The results also suggest that banana lipids did not affect the concentration of serum cholesterol. Feeding of dopamine, n-epinephrine and serotonin tended to raise the concentration of serum cholesterol. Thus, all the substances tested which were thought to be susceptible to influence by hot-air drying were unlikely to be responsible for the hypocholesterolaemic effect. However, both soluble and insoluble fibres fractionated from banana pulp had a cholesterol-lowering effect, with the exception of cellulose. It was assumed that a browning reaction undergone during hot-air drying might be related to the disappearance of the hypocholesterolaemic effect of banana pulp dried in a hot-air current. The results obtained support the conclusion that soluble and insoluble components of dietary fibre participate in the hypocholesterolaemic effect of banana pulp.
以雄性大鼠为实验对象，研究香蕉果实（香蕉品种为卡文迪什香蕉，学名Musa sapientum L. var. Cavendishii）果肉对高脂饮食大鼠的降胆固醇作用。高脂饮食为猪油（50 g/kg）和胆固醇（5 g/kg）。将冷冻干燥的香蕉果肉以300或500 g/kg的比例添加到饲料中时，表现出显著的降胆固醇作用，而热风（65℃）干燥的香蕉果肉则无此作用。香蕉果肉制备的淀粉和单宁无降胆固醇作用。结果还表明，香蕉中的脂质不影响血清胆固醇浓度。喂食多巴胺、去甲肾上腺素和血清素会使血清胆固醇浓度升高。因此，所有被认为易受热风干燥影响的测试物质都不太可能是降胆固醇作用的原因。然而，从香蕉果肉中分离出的可溶性和不溶性纤维均有降胆固醇作用，但纤维素除外。推测热风干燥过程中发生的褐变反应可能与热风干燥香蕉果肉降胆固醇作用的消失有关。所得结果支持膳食纤维的可溶性和不溶性成分参与香蕉果肉降胆固醇作用的结论。
