动物脂肪是人类膳食的重要组成部份 ,它不仅可以供给人体热能和必需的脂肪酸 ,而且 ,能在烹调过程中改善食物的感官性质 ,增加适口性。但是 ,脂肪的质量却不容忽视。首先 ,动物脂肪易氧化酸败 ,分解后形成各种醛、酮、醛酸及酮酸等有机物 ,使之产生一种不愉快的气味 ,降低了食 Animal fat is an important part of the human diet, it can not only supply the human body heat and essential fatty acids, but also in the cooking process to improve the sensory properties of food and increase palatability. However, the quality of fat can not be ignored. First of all, animal fats are easily oxidized and rancid, forming various aldehydes, ketones, aldehydes, keto acids and other organic substances after decomposition to make them produce an unpleasant odor and reduce the consumption of food