Student Research Day Abstracts and Posters

Document Type

Chapman access only Poster

Publication Date

Spring 5-14-2015

Faculty Advisor(s)

Criselda Toto, Lilian Were

Abstract

The ability of 0.1% w/w roasted coffee with varying roast degrees (light or dark) and application form (spent, ground, or lyophilized brew) to inhibit lipid and protein oxidation in frozen (-18°C) raw minced pork stored under high oxygen modified atmosphere packaging (MAP) was investigated. Thiobarbituric acid reactive substances (TBARS) values, thiol content, percent metmyoglobin, and changes in color values lightness (L*), redness (a*), and yellowness (b*) were measured monthly over a 3 month storage period. The TBARS values for coffee treatments in pork were comparable to rosemary and negative control, indicating antioxidant treatment may not be the main deterrent in inhibiting lipid oxidation (LOX). By month 3, both roasts of spent coffee grounds (SCG) and light whole ground coffee (WGC) was as effective as rosemary (P<0.05). Thiol content remained highest for rosemary and dark lyophilized brewed coffee (LBC), while other coffee treatments were not as effective at inhibiting protein oxidation (POX). Metmyoglobin was ~54-56% throughout storage, with no significant difference between treatments. No significant changes in L* and b* values between treatments over time. The a* values increased from month 0 to 1 (average a* 5.59  7.26), but maintained these values throughout the rest of storage. These results suggest that SCG and WGC are more effective against LOX while LBC was more effective against POX, thus incorporating a combination of coffee treatments in pork could protect against LOX and POX simultaneously.

Comments

Presented at the Spring 2015 Student Research Day at Chapman University.

Access to this poster is restricted to Chapman University students, faculty, and staff.

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