Relationship between the High Mr Subunits of Glutenin of South African Wheats and End-use Quality

Abstract

Correlations were sought between the high Mr glutenin subunit compositions of South Africa wheats, determined by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulphate, and end-use quality characteristics. Statistically significant relationships were identified between Chopin Alveograph, Brabender Extensigraph, National Mixograph and Brabender Farinograph parameters and the high Mr glutenin subunit patterns. Band combinations 5 + 10, 13 + 16 and 7 + 9 were suggested to be predominant in conferring good rheological quality characteristics, though the high Mr glutenin subunit compositions were unable fully to explain the variation in quality. Band combination 17 + 18 was apparently related negatively to quality parameters, a finding contrary to published data.