SUMMARY— The effect of chlortetracycline (CTC), oxytetracycline (OTC), papain, and refrigerator storage temperatures on metmyoglobin (MetMb) reducing activity (MRA) and oxygen utilizing capacity of ground raw beef was investigated. CTC did not affect either MRA or oxygen utilization. OTC showed variable effects on MRA but did not affect oxygen utilization. Papain increased MRA over that of controls, and papain treated samples maintained higher MRA longer than controls. Reduction of MetMb took place in the refrigerator at both 0° and 9°C; the rate of MetMb reduction decreased with decreasing temperature. Significant positive correlations were found between MetMb and malonaldehyde in stored refrigerated meats. MRA and MetMb were negatively correlated.
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HUTCHINS et al. (1967) studied this question.
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