Contributors to Sweet and Milky Odor Attributes of Spray-Dried Skim Milk Powder

Abstract

Contributors to sweet and milky odor attributes of spray-dried skim milk powder have been investigated. Spray-dried skim milk was homogenized with water, and the volatiles were isolated by simultaneous steam distillation extraction (SDE). The odor concentrate was fractionated by silica gel TLC. Two polar fractions with sweet and milky odors were analyzed by GC and GC-MS. To elucidate the compounds directly contributing to the characteristic flavor, these fractions were further fractionated by a preparative GC and the separated fractions and peaks were sniffed. Nonanoic acid, decanoic acid, and dodecanoic acid were responsible for a sweet, fatty, and butter-like odor ; undecanoic acid contributed a sweet, and butter-like odor ; and γ-undecalactone, γ-dodecalactone, a γ-lactone, δ-decalactone, and δ-undecalactone gave a sweet and milky odor.