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Light Activated Flavor in Milk

Dairy Science Department, Louisiana Agriculture Experiment Station, Louisiana State University, Baton Rouge 70803

ABSTRACT

An expert panel was used to determine the frequency and severity of light activated flavors in milk packaged in plastic jugs. Samples were evaluated weekly (different day each week) with a total of 90 samples being examined. Fifty-three samples (59%) of the total were rated as having a moderate to strong light-activated flavor. After establishing the existence of a severe problem, large consumer panels were run at two shopping centers. The triangle test was used to determine whether panelists could distinguish between milk and light activated flavor and milk with no noticeable off-flavor. In addition, preference was obtained from those respondents correctly identifying the odd sample. Consumers could distinguish between samples. The age group 25 yr and younger was the most successful in correctly detecting differences; therefore, a survey also was conducted at a local college with 69 of 132 respondents correct. Preference testing over all portions of the study indicated that 63% preferred the milk with no off-flavor, 27% preferred the light activated flavor, and 10% had no stated preference. Results from one of the malls (identified as a "blue collar" mall) brought the average down for those preferring milk with no light activated flavor.

¹ Dean Foods Company, Rockford, IL 61101.