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J Assoc Off Anal Chem. 1988 Jul-Aug;71(4):851-3.

Determination of fat in raw milk: comparison of mojonnier (ether extraction) and Gerber method.

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Rutgers University, Cook College, Department of Food Science, New Brunswick, NJ 08903.


Results are compared for the approved Gerber method that specifies a TC 11.07 mL pipet and 2 modifications that specify a TC 10.77 mL pipet or a weighed 11.125 g sample of milk rather than a pipetted sample. All results were also compared with results obtained with the Mojonnier method for determining the fat content of raw milk. The standard deviation is somewhat lower for the Mojonnier method than for any of the Gerber methods; among the Gerber methods, the standard deviations were lower for the TC 10.77 mL and 11.125 g modifications. It is recommended that one of these modifications replace the current specified TC 11.07 mL pipet method.

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