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Comparison of the Effects of Added Orthophosphate on Calcium Uptake and Release by Bovine and Rabbit Muscle Sarcoplasmic Reticulum
Author(s) -
NEWBOLD R. P.,
TUME R. K.
Publication year - 1981
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.1365-2621.1981.tb04165.x
Subject(s) - endoplasmic reticulum , calcium , chemistry , sarcoplasm , rabbit (cipher) , lagomorpha , endocrinology , medicine , biophysics , biochemistry , biology , statistics , mathematics , organic chemistry
In respect of Ca accumulating capacity in the absence of added inorganic orthophosphate (P i ) and maximum rate of Ca uptake, sarcoplasmic reticulum (SR) prepared from beef sternomandibularis muscles is intermediate between SR from rabbit white muscles and SR from rabbit red muscles. In the presence of added P i , the Ca accumulating capacity of SR, whatever the source, is increased and a constant rate of uptake is reached. This constant rate is greater the higher the P i concentration. The cold‐induced release of Ca from beef muscle SR is only partly reduced by including up to 50 mM P i in the medium, whereas the release from rabbit white muscle SR is completely prevented by only about 20 mM P i . This last finding is discussed in terms of the possible importance of postmortem accumulation of P i in relation to cold shortening.