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Dietary effects of bitter gourd oil on blood and liver lipids of rats.

Bitter gourd is widely used as an edible plant in Asia. In this study, we evaluated the effects of bitter gourd oil (BGO) on the blood and liver lipids of rats. Three groups of rats were given a basal diet (AIN-93G) containing 7% fat by weight. The dietary fat consisted of soybean oil (control), soybean oil + BGO (6.5:0.5, w/w; 0.5% BGO), or soybean oil + BGO (5:2, w/w; 2.0% BGO). This fat treatment gave 3.4 and 15.4% of cis(c)9,trans(t)11,t13-18:3 in the dietary fat of 0.5 and 2.0% BGO, respectively. Fatty acid analysis showed the occurrence of c9,t11-18:2 in the liver of rats fed BGO diets, whereas this conjugated linoleic acid (CLA) isomer was not detected in the liver of rats fed the control diet. Furthermore, dietary BGO decreased the concentration of 18:2n-6 and increased the concentration of 22:6n-3. The formation of the CLA isomer in the liver lipids of rats fed BGO diets could be explained by either of the following two metabolic pathways, namely, enzymatic biohydrogenation of c9,t11,t13-18:3 or enzymatic isomerization of c9,c12-18:2. The BGO diets had significantly reduced free cholesterol levels with a trend toward an increase in HDL cholesterol, but there was no significant change in the total cholesterol. The dietary BGO also affected the level of plasma hydroperoxides. A slight but significant increase in hydroperoxides was found in the rats fed 2.0% BGO. This may be attributed to the lower oxidative stability of c9,t11,t13-18:3 in BGO.