Introduction
In the course of investigations concerning the deterioration of lipids in frozen fish, the need arose for an efficient and rapid method of total lipid extraction and purification. Furthermore, due to the highly unsaturated nature of fish lipids, the method had to involve only mild treatment so as to minimize oxidative decomposition and the production of artifacts. Several existing methods were considered but none was entirely satisfactory. The methods of Dambergs (1) and Folch
et
al
2)
were too time-consuming for routine investiga- tions and since the former method entailed heating and evaporation it was considered unsuitable for lipid composition studies. The recent method of Folch
et
al
3),
which was published while this study was in progress, was more rapid than their previous method but still had the disadvantage of employing large and inconvenient volumes of solvent. The method used by Dyer and Morton
4)
was rapid but extracted only a fraction of the total lipid. The present paper describes a method whereby the lipids of biological materials can be extracted and purified in a single operation. Mixtures of chloroform and methanol have had wide use as lipid extractants and examination of the chloroform-methanol-water phase diagram (Fig. 1) led to the following hypothesis. Optimum lipid extraction should result when
Manuscript received February
27,
1959. Contribution from the Fisheries Research Board of Canada, Technological Station, Halifax, Nova Scotia.
Can.
J.
Biochem. Physiol. Vol.
7
1959)
C a n . J . B i o c h e m . P h y s i o l . D o w n l o a d e d f r o m w w w . n r c r e s e a r c h p r e s s . c o m b y C o r n e l l U n i v e r s i t y o n 0 6 / 2 6 / 1 2 F o r p e r s o n a l u s e o n l y .
Introduction
In the course of investigations concerning the deterioration of lipids in frozen fish, the need arose for an efficient and rapid method of total lipid extraction and purification. Furthermore, due to the highly unsaturated nature of fish lipids, the method had to involve only mild treatment so as to minimize oxidative decomposition and the production of artifacts. Several existing methods were considered but none was entirely satisfactory. The methods of Dambergs (1) and Folch
et
al
2)
were too time-consuming for routine investiga- tions and since the former method entailed heating and evaporation it was considered unsuitable for lipid composition studies. The recent method of Folch
et
al
3),
which was published while this study was in progress, was more rapid than their previous method but still had the disadvantage of employing large and inconvenient volumes of solvent. The method used by Dyer and Morton
4)
was rapid but extracted only a fraction of the total lipid. The present paper describes a method whereby the lipids of biological materials can be extracted and purified in a single operation. Mixtures of chloroform and methanol have had wide use as lipid extractants and examination of the chloroform-methanol-water phase diagram (Fig. 1) led to the following hypothesis. Optimum lipid extraction should result when
Manuscript received February
27,
1959. Contribution from the Fisheries Research Board of Canada, Technological Station, Halifax, Nova Scotia.
Can.
J.
Biochem. Physiol. Vol.
7
1959)
C a n . J . B i o c h e m . P h y s i o l . D o w n l o a d e d f r o m w w w . n r c r e s e a r c h p r e s s . c o m b y C o r n e l l U n i v e r s i t y o n 0 6 / 2 6 / 1 2 F o r p e r s o n a l u s e o n l y .
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