Abstract
Off-flavor of a spray-dried skim milk powder has been investigated. Commercially processed spraydried skim milk was homogenized with water, and the volatiles were isolated by simultaneous steam distillation-extraction under reduced pressure using diethyl ether as a solvent. The odor concentrate was analyzed by gas chromatography and gas chromatograph-mass spectrometry. To elucidate the compounds contributing to the off-flavor, the concentrate was fractionated by silica gel TLC. A slightly polar fraction with cowhouse-like odor, which was similar to the odor attribute of off-flavor, was further fractionated by a preparative GC
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