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Low‐voltage Electrical Stimulation Effects on Proteolysis and Lamb Tenderness
Author(s) -
Lee S.,
Polidori P.,
Kauffman R.G.,
Kim B.C.
Publication year - 2000
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.2000.tb13587.x
Subject(s) - tenderness , calpastatin , longissimus thoracis , stimulation , calpain , chemistry , meat tenderness , longissimus , proteolysis , glycolysis , medicine , zoology , endocrinology , anatomy , biochemistry , food science , biology , metabolism , enzyme
Lamb carcasses were subjected to low‐voltage electrical stimulation (ES; 28 V, 60 Hz) within 5 min postmortem (PM). After ES, the longissimus thoracis (LT) and semimembranosus (SM) muscles were removed to investigate subsequent biochemical changes. The pH values of the ES muscles declined rapidly until the 1 st 3 h PM (p < 0.05). The activities of μ‐calpain and calpastatin in ES muscles decreased significantly after 10 h PM (p < 0.05). Both ES LT and SM muscles tended to have lower shear‐force values, which suggested ES might accelerate activation of calpains as well as glycolytic rate, thereby improving muscle tenderness. Differences in thin and troponin‐T degradation between treatments were also observed with time PM.