Abstract
The effectiveness of hydrogen peroxide (0.85-2.0% by weight) and sodium tripolyphosphate (0-2.0% by weight) at different pH (pH 4.5-10.5) applied as a surface treatment or by injection into the fillet for bleaching the dark muscle of Alaskan pollock (Theragra chalcogramma) was evaluated. At a pH of 8.5-10.5 combinations 0.85-2% sodium tripolyphosphate and 0.85-2% hydrogen peroxide were effective in reducing the color of the dark muscle in intact fillets and minces. At higher levels of peroxide, lightening was generally accompanied by higher yellow (+b) values for fillets and minced dark muscle tissue.
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