RT Journal Article SR Electronic T1 Zinfandel Grape Juice Protein Fractions and Their Amino Acid Makeup as Affected by Crop Level JF American Journal of Enology and Viticulture JO Am J Enol Vitic. FD American Society for Enology and Viticulture SP 8 OP 10 DO 10.5344/ajev.1979.30.1.8 VO 30 IS 1 A1 C. S. Ough A1 G. Anelli YR 1979 UL http://www.ajevonline.org/content/30/1/8.abstract AB The amino acid compositions of musts from grapes cropped at several different levels were determined. The proteins of the grapes from each treatment were isolated by Sephadex gel column. The protein complex was further separated by electrofocusing equipment into seven or eight fractions. The percentage of each fraction was determined for each treatment. The percentage of the first two fractions varied slightly with crop load. Amino acid composition varied between the fractions but not between crop levels.