Effect of Precooking Conditions on Color of Cooked Beef Patties

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Abstract
In three separate trials, the visually and instrumentally determined color of patties cooked either fresh, frozen, or after thawing was evaluated. In trial 1, the effects of thawing and packaging were evaluated. The internal color of patties cooked to 71°C within 12 h of thawing at 7°C remained red-pink. Only after thawing for 18 h or longer did cooking to 71°C result in a well-done appearance. The color of patties thawed while vacuum packaged and then cooked was more red than the color of non-vacuum-packaged patties after cooking. Spectral analysis of the raw product indicated that the effects of thawing and packaging on cooked color were linked to the level of metmyoglobin (metMb); higher levels of metMb resulted in a less red patty color after cooking. In trials 2 and 3, the metMb level was varied by storage and/or processing conditions. Differences in the metMb level before freezing seemed to decrease during freezing and thawing. Differences in metMb before processing did not significantly (P > 0.05) ...

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