摘要
本文以低芥酸菜籽油为对照,研究高芥酸菜籽油对雄性SD大鼠肝内软脂酸和丁酸氧化活性的影响。结果表明,摄入高芥酸菜籽油导致大鼠肝重增加,肝组织对软脂酸的氧化活性降低。肝重增加程度与芥酸摄入量呈正相关,但软脂酸氧化活性降低则以短期(1周)喂饲组最明显,而较长期(4周)喂饲后此活性有所回升,提示大鼠对高芥酸菜籽油可产生一定的适应性。在本研究中未发现肝组织对丁酸的氧化活性有明显改变,故认为高芥酸菜籽油对长链脂肪酸氧化的抑制作用机制可能是由于芥酸掺入线粒体膜,干扰了膜上的转运系统,使脂酰辅酶A不能进入线粒体氧化,而不是直接抑制线粒体内的β-氧化酶系统。
The effects of high erucic acid rapeseed oil (HER) on fatty acid oxidation in rat livers compared with low erucic acid rapeseed oil (LER) were studied. Weanling male SD rats were fed on 20% (% by weight, similarly hereinbelow) HER or LER diet for a week or 4 weeks, or 5% HER diet for 4 weeks. The hepatic capacity for oxidation of butyric acid and palmitic acid was determined by titrating the acetone produced by the fatty acid oxidation. The results showed that feeding HER to rats led to an increse in weight of liver and the extent of this increase was positively correlated to the intake of erucic acid (C22:1, n-9 cis). Feeding HER reduced the hepatic oxidation capacity for palmitic acid, notably in 20% HER (1 wk) group. Feeding LER had not shown this effect,indicating that erucic acid plays an important role in the toxicity of rapeseed oil. In the present study it was not found that the hepatic oxidation capacity for butyric acid was influenced by the intake of HER. Therefore, we considered that the inhibitory effect of HER on oxidation of long-chain fatty acids probably resulted from that the incorporation of erucic acid into mitocho-ndrial membranes interfered with the fatty acyl-CoA transfering system on the membranes, leading the fatty acyl-CoA to be unable to enter the mitochondria and to be oxidized there, but not from that the B-oxidation system in mitochondria was directly inhibited.
出处
《营养学报》
CAS
CSCD
北大核心
1991年第2期108-113,共6页
Acta Nutrimenta Sinica
关键词
菜籽油
芥酸
β-氧化
rapeseed oil erucic acid β-oxidation
