摘要
研究了提取溶剂、次数以及溶剂的配比对轮虫脂肪提取的影响。分别用氯仿甲醇体积比为2:1、1:1、1:2,苯石油醚体积比2:1、1:1、1:2,丙酮石油醚1:4、3:7、2:3作为提取溶剂,提取冻干轮虫(Brachionus rotundiformis)样品脂肪,测定脂肪含量与皂化值,筛选得出3种提取溶剂的最佳配比;比较提取次数为1~3次间脂肪含量的差异,得出最佳提取次数;将3种最佳配比与索氏提取法(国标)提取样品脂肪进行比较,测定脂肪含量与皂化值。结果显示,在冻干轮虫脂肪提取中,提取次数对样品脂肪含量没产生显著影响(P>0.05);3种溶剂的最佳配比分别为氯仿甲醇2:1、苯石油醚1:2、丙酮石油醚2:3;其中丙酮石油醚2:3处理组的脂肪含量和皂化值分别达到9.71%和198,均显著高于索氏提取法(国标)和其余处理组(P<0.05)。故轮虫脂肪提取1次为宜,最佳溶剂及配比为丙酮石油醚体积比2:3,本方法具有提取高、时间短、安全性高、成本低等优点,具有一定的实际应用价值。
Effects of lipids extraction on freeze-dried rotifers(Brachionus rotundiformis) by extraction solvents of different mixing proportion with different extracting times were studied.Three extraction solvents were designed(chloroform: methanol(V/V) 2:1,1:1,1:2,benzene: petroleum ether(V/V) 2:1,1:1,1:2,acetone: petroleum ether(V/V) 1:4,3:7,2:3) to extract freeze-dried rotifer lipids with 1–3 times extraction.The lipids yield and saponifica-tion numbers were determined and were compared with the Soxhlet extractor method(national standard).Results showed that the extracting times did not significantly(P0.05) affect lipid content in all treated groups,and opti-mum solvent proportion was determined to be chloroform: methanol 2:1,benzene: petroleum ether 1:2 and acetone: petroleum ether 2:3.The lipid content and saponification number of acetone: petroleum ether 2:3 treatment were 9.71% and 198,respectively,and were significantly(P0.05) higher than that of the Soxhlet extractor method and other treatments.The results suggest that one time extraction by acetone: petroleum ether 2:3 would be the opti-mum treatment for lipids extraction on freeze-dried rotifers.
出处
《中国水产科学》
CAS
CSCD
北大核心
2012年第6期1074-1078,共5页
Journal of Fishery Sciences of China
基金
国家自然科学基金项目(30671621)
吉林省产业技术研究与开发项目(2011002-1)
关键词
轮虫
溶剂
配比
脂肪含量
皂化值
rotifer
solvent
mixing proportion
lipid content
saponification number