Abstract
Potato tubers had 1.67% N/dry mutter. Nitrogen was distributed in all anatomical regions of the tuber. Of the total N content, 43% was dialyzable-N and 32.9% true protein-N. The protein, by solubility fractionation, provided 61% albumin, 23% globulin, 1.4% prolamin and 9% glutelins. As revealed by sodium dodecyl sulfate electrophoresis (SDS-PAGE), the albumin had two major protein species, one of 45 X 18, the second of 12-25 X 18 daltons. Prolamin and glutelins contained protein bands coinciding in molecular weight with those of albumin and globulin. Protein hydrolysis with 4 N methanesulfonic acid was superior to that of 6 N HC1. Amino acid composition of proteins was determined by ion-exchange column chromatography. Some minor losses in protein composition of potatoes occurred during processing.
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