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Lipase-rich fractions of skimmilk, frozenthawed skimmilk and a water extract of rennet-casein, were obtained by Sephadex gel filtration. Three similar fractions were obtained from all materials. Protein predominated in the fast-moving fraction and lipase activity concentrated in the two slow-moving components. Slow components showed 10-200 fold greater activity than the starting material, with the slowest moving component being the highest. Slower moving components from frozen-thawed skimmilk and from the water extract of rennet casein were 5-10 times higher in specific activity than comparable skimmilk fractions.
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Gaffney et al. (1968) studied this question.
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