从鱼糜下脚料中提取鱼油的研究

Study on extraction of fish oil from wastes of fish surimi

研究以金线鱼和长蛇鲻的混合鱼糜生产下脚料为材料,利用钾法提取鱼油。结果表明,钾法提取鱼油的工艺参数为水解pH为7.5,水解温度70℃,水解时间55min,硝酸钾用量4.5%,盐析时间30min,在该条件下鱼油的提取率达到64.5%。鱼油的理化性质达到了SC/T3502-2000标准粗鱼油的二级要求。鱼油中饱和脂肪酸的含量较高,占总量的48.59%;单不饱和脂肪酸和多不饱和脂肪酸的含量相当,分别为24.48%和24.49%,多不饱和脂肪酸主要是DHA和EPA,含量分别为11.18%和5.17%。

Fish oil was extracted from the wastes of fish surimi by the potassium hydroxide hydrolysis. The results show that the process parameters of extraction of fish oil were as follows ： hydrolysis temperature 70℃, hydrolysis pH 7.5, hydrolysis time 55 min, the amount of potassium nitrate 4. 5% , the saltout time 30 min. Under these conditions, the extraction rate of fish oil was up to 64. 5%. The physics and chemistry indexes accorded with the second crude fish oil demand for SC/T3502-2000 standard. The content of the saturated fatty acid was relatively high in fish oil, which accounted for 48. 59% of the total amount. The content of monounsaturated fatty acid was equivalent to the content of the polyunsaturated fatty acid, 24. 48% and 24.49% , respectively. The polyunsaturated fatty acids were mainly DHA and EPA, the content 11.18% and 5.17%, respectively.