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Recovery of Added Monoglycerides from Milk

Department of Animal Industries, Storrs (Conn.) Agricultural Experiment Sta.

ABSTRACT

Monobutyrin is water-soluble and is probably the monoglyceride of shortest chain length that would be found in lipolyzed milk. In a previous paper (2), some of the difficulties encountered in recovering added monobutyrin from milk were described. Commercial monobutyrin contains glycerol which analyzes as if it were two moles of monoglyceride. The poor recoveries of monobutyrin encountered from milk were due to the retention of glycerol in the silica-gel when this method was used to extract monoglycerides. Thus, the difficulties centered about the purification of monobutyrin. This has been accomplished with the method of Gander (1), in which monobutyrin is eluted from a celite-silicic acid column that retains the glycerol. This paper describes the recovery of purified monobutyrin and monostearin from milk with the silica-gel extraction method.

Monostearin was purified by washing an ether solution with water to remove glycerol, and had a total monoglyceride content of 83.8%. Monobutyrin was purified as described above, and had a total monoglyceride content of 92.2%. Both were added to pasteurized milk at levels of 0.1 and 2.0 mM per 100 g. of fat. The monostearin was dispersed with a hand-operated homogenizer at 70° C. The extractions from milk and analyses of monoglycerides were performed as described in the previous paper (2).