カツオ・マグロ類の普通,血合両筋肉の化学的研究

The ordinary and dark muscles of albacore, yellowfin and skipjack tunas were examined for protein composition, along with the contents of myoglobin (Mb), and ATP and related compounds. The stroma protein and Mb contents were around 5 and 10-40 times, respectively, higher in the dark than in the ordinary muscle in the three fishes. The K value, a parameter of freshness, of the dark muscle was 3-14 times higher than that of the ordinary muscle in every analyzed specimen. The proportions of collagen to elastin in connective tissues were fairly constant regardless of the species and the part of the muscle, 88-98:2-12.