Tension Development of Carp Muscle Immersed in Pure Water and CaCl2 Solution

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  • Tension Development of Carp Muscle Immersed in Pure Water and CaCl<sub>2</sub> Solution
  • Tension Development of Carp Muscle Imme

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The relationships between carp muscle tension in rigor and the tension induced by permeation of water or CaCl2 solution were investigated. Initial weight increase of fish muscle in water corresponded to initial tension development, and the occurrence of tension shoulder was caused by water permeation into the muscle. In the stressed fish muscle, osmosis did not cause a rapid permeation of the surrounding water into the hypertonic muscle due to the generating contractile tension. Within the immersiontime of 14-19 min required for calcium-induced tension peak, arapid permeation of the CaCl2 solution into the muscle was observed. The tension at a high level of ATP and calcium ion was greater than the rigor tension at a low ATP level with water permeation. The rigor tension and the permeated calcium-induced tension declined but the water-induced tension did not decline. The changeof ATP/IMP absorbance ratio obtained for the extract from the surface and insideof the muscle in water during postmortem immersion was almost the same as that for the extract of muscle fillet during postmortem storage. The development of water-induced tension was ascribed to the swelling effect which was caused by the permeation of water into the muscle.

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