The effect of grape seed extract (GS; 0.02%), oleoresin rosemary (OR; 0.02%), water-soluble oregano extract (WS; 0.02%), propyl gallate (PG; 0.02% of fat), butylated hydroxyanisole (BHA; 0.02% of fat), and butylated hydroxytoluene (BHT; 0.02% of fat) on the oxidative and color stability of precooked pork patties stored at −18• C for up to 6 mo were determined. Pork lean and trim were ground and mixed (30% fat). Antioxidants mixed with salt (2%) were added. Patties were formed, cooked to 71• C, over wrapped in PVC, and stored at −18 • C. Lipid oxidation was determined using thiobarbituric acid-reactive substances (TBARS) and descriptive sensory evaluation. Color was determined instrumentally and visually. Samples were evaluated after 0, 1, 2, 3, 4, 5, and 6 mo of frozen storage. Based upon TBARS values, PG (0.21 mg MDA/kg) and GS extract (0.23) had more antioxidant activity over the storage period than did WS, OR, BHA, and BHT. GS had no effect on a * or b * values. Grape seed extract (0.02%) has the potential to inhibit oxidative rancidity as well as current synthetic antioxidants.

Based on TBARS, the order of effectiveness of the antioxidants was PG and GS > OR > BHA > WO and BHT > control. TBARS were well correlated with sensory evaluations of odor and flavor. Antioxidants also protected a* values during storage.