Date of Graduation

5-2021

Document Type

Thesis

Degree Name

Bachelor of Science in Agricultural, Food and Life Sciences

Degree Level

Undergraduate

Department

Animal Science

Advisor/Mentor

Yancey, Janeal

Committee Member/Reader

Vierck, Kelly

Committee Member/Second Reader

Owens, Casey

Abstract

The objective of this study was to explore different type of retail cases and case environments, primarily lighting, to quantify the impact on shelf life. Coarse ground 80:20 beef from a local retail establishment was acquired between 7 and 10 d from the box date and fine ground through a 9.5 mm grinder plate, and then formed into 150.25 g patties with an automatic patty forming machine. Each patty was then individually packaged in PVC-overwrap packages and randomly assigned to one of the four different treatments: open, multideck cases with 3000 K lighting (OPEN3000),open 3500 K lighting (OPEN3500),enclosed, multideck cases with doors with 3000 K lighting (DOOR3000), and enclosed, multideck with doors at 3500 K lighting (DOOR3500).Patties were displayed for 7 d and instrumental color values (CIE L*, a*, and b*) were taken every 24 h. Data were analyzed as a 2 x 2 factorial arrangement with repeated measures, case type, lighting intensity, and their interaction serving as fixed effects. Patties in DOOR cases possessed greater L* values (P< 0.05) than OPEN cases on d 3 of display. A similar trend existed for a*, where DOOR patties were redder (P<0.05) than OPEN patties from d 2 to the end of display. b* values were higher (P< 0.05) in DOOR cases from d 1 to d 4 of display. Patties from the DOOR cases also possessed increased chroma values (P< 0.05) from d 1 to 6 of display and decreased (indication more red) hue angle values from d 3 to the end of display. No differences were observed between lighting intensity for any trait evaluated (P ≥0.293). These results indicate patties placed in enclosed retail cases with doors are lighter, redder, and more intense in color during display compared to traditional open-front cases, which indicated color stability.

Keywords

color, color stability, ground beef, lighting, retail display, service learning

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