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ABSTRACT
Conditions that optimize 2-methylisoborneol (MIB) and geosmin reduction by protein solubilization were evaluated in channel catfish. For both MIB and geosmin spiked fish, acid and alkaline solubilizations effectively (p < 0.001) reduced off-flavor. Average MIB and geosmin levels for untreated, unprocessed fish were 1.396 and 1.992 ppb, respectively. Pooled centrifuge levels for treated fish were: 0.194 ppb MIB and 0.398 ppb geosmin using citric acid; 0.104 ppb MIB and 0.258 ppb geosmin using phosphoric acid; 0.143 ppb MIB and 0.543 ppb geosmin using acetic acid; and 0.0987 ppb MIB and 0.426 ppb geosmin using alkaline (sodium hydroxide) conditions. Centrifugation did not significantly affect (p = 0.999) off-flavor removal for MIB, however it did significantly affect (p = 0.05) geosmin removal.