鱼粉加工压榨液中EPA和DHA富集工艺优化及其特性分析

为富集鱼粉加工压榨液中EPA和DHA，采用尿素包合和分子蒸馏相结合的方法对EPA和DHA进行富集，并优化工艺，同时对富集后鱼油进行理化指标及脂肪酸分析。结果表明，尿素包合条件为:尿素/鱼油1.5:1（m/m）、溶剂/鱼油6:1（v/m）、结晶温度0℃、结晶时间15 h、包合次数1次；分子蒸馏条件为:蒸馏温度110℃、刮膜器转速250 r/min、进料速率3 mL/min、压力5 Pa、二级蒸馏。联合采用尿素包合和二级分子蒸馏可使精炼鱼油中EPA和DHA含量由22.68%提高到87.50%，且EPA/DHA约为0.58，富集后鱼油理化指标均达到精制鱼油一级标准。

Enrichment of EPA and DHA from Pressed Liquor of Fish Meal Processing and Its Characteristics Analysis

In order to enrich EPA and DHA from pressed liquor of fish meal processing,the method of urea inclusion and molecular distillation were used,and the processing was optimized.The physicochemical indexes and fatty acid analysis of the enriched fish oil were carried out.The results showed that the ratio of urea to fish oil was 1.5∶1,the ratio of solvent to fish oil was 6∶1,the crystallization temperature was 0℃,the crystallization time was 15 h,and the inclusion times were once.The conditions of molecular distillation were as follows:Distillation temperature was 110℃,scraping speed was 250 r/min,flow rate was 3 mL/min,pressure was 5 Pa,and two level of molecular distillation was used.After urea inclusion and molecular distillation,the EPA and DHA content could increase from 22.68%to 87.50%,and EPA/DHA was about 0.58.The physicochemical indexes of enriched fish oil accorded with quality requirements for the first grade standard of refined fish oil.