冷蔵中における牛脊最長筋繊維のミオグロビン分布ならびに筋繊維断面積の変化

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  • 冷蔵中における牛脊最長筋繊維のミオグロビン分布ならびに筋繊維断面積の変化(農学部門)
  • レイゾウ チュウ ニ オケル ギュウ セキ サイチョウスジ センイ ノ ミオグロビン ブンプ ナラビニ スジセンイ ダンメンセキ ノ ヘンカ
  • Change in cellular distribution of myoglobin and cross-sectional area of bovine longissimus dorsi muscle fibers during cold storage (Agriculture)

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The longissimus muscle samples (5th rib) were taken as quickly as possible after slaughter from two Japanese Black cows and a Holstein young bull to determine the change in cellular distribution of myoglobin, myoglobin content and cross-sectional fiber area during cold storage of 3℃ ave. for 13 days. Fresh muscle fibers (2-3 hr after slaughter) were clearly discliminated into three types by benzidine reactions, i. e., the red, the white and the intermediate muscle fibers. The white fibers held a majority of about 50 percent, the red and the intermediate fibers were estimated about 25 percent, respectively. In the bovine longissimus, the red fiber grouping pattern which is well-known for swine muscles was not observed. The proportion of the three fiber types changed as the cold storage advanced, that is, in samples stored for 10 to 13 days the intermediate fibers increased to almost 90 percent, the red and the white fibers decreased to about 5 percent, respectively. On the other hand, very little changes were observed in total pigment concentration of all samples studied during cold storage. This fact suggests that the pigment moves from the myoglobinrich red fibers to the less concentrated white or intermediate fibers with aging of the muscles, so that the myoglobin concentrations among three fiber types become uniform. Average cross-sectional areas of the three fiber types within a sample were in the order of the white, the intermediate and the red fibers during cold stroage. As to the effect of cold storage on the area of the three fiber types, it increased in Japanese Black, whereas it decreased in Holstein after 3 days of storage. However, these areas almost returned to the initial value on the seventh day of cold storage, hereafter, the areas except of the white fibers showed a tendency to decrease gradually.

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