Abstract
Glycolytic metabolic pathways in postmortem adductor muscle of the sea scallop (Placopecten magellanicus) during iced storage were studied by means of 14C-pyruvate injected into the muscles. Ion-exchange fractionation of perchloric acid extracts of muscle into cationic, anionic, and neutral components showed that the radioactivity derived from 14C-pyruvate was rapidly incorporated into the cationic fraction during the postmortem storage period. Subsequent ion-exchange chromatography revealed that most of the radioactivity in the cationic fraction was distributed among three major peaks, whose components were identified by paper chromatography as (Peak I) alanine, (Peak II) α-amino-n-butyric acid and an unidentified compound, and (Peak III) octopine. These findings indicate that the disposition of pyruvate in postmortem scallop muscle is mainly via two pathways: transamination to amino acids, and reductive condensation with arginine to octopine. This metabolic pattern in muscles injected immediately after shucking (0-day series) did not differ significantly from that in muscles injected after preliminary storage of the shucked meats for 4 days in ice (4-day series).
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