Microbial, Biochemical and Food Biotechnology

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Browsing Microbial, Biochemical and Food Biotechnology by Subject "Abrasion/dehulling"

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    Determination of the malting and milling performance of sorghum cultivars
    (University of the Free State, 2001-05) Van Loggerenberg, Magdalena; Osthoff, G.; Pretorius, A. J.
    English: Consumer demands for sorghum food acceptability stress the need for quality evaluation of milled and malted products. The aim of this study was to determine the milling and malting quality of sorghum cultivars with different physical and chemical qualities. The malting, physical and milling qualities of 24 sorghum cultivars were investigated over 2 seasons at 3 localities per season. The most important malting quality parameters that were identified with the canonical variate analysis were free amino nitrogen, diastatic power, germinative energy and vigour, compared to polyphenols, malting loss and water absorption that was identified as less important. From the canonical variate analysis, the most important physical qualities measured were sieve . fraction large, hundred kernel weight, water absorption and moisture content and were used to predict milling quality, while sieve fraction medium and small and meal fractions were found to be less important. Food quality properties were determined from roller and abrasive decortication milled meal. The abrasive hardness index, dehulling index and viscosity were important abrasive decortication milling parameters, with break 2 bran, break 1 bran, L-values, extraction, break 2 meal, break 1 meal and break 2 grits being important roller milling parameters. The best malting cultivars were APN 881, NK 286, PAN 8446, PAN 8660, SNK 3443, SNK 3337, SNK 3663, SNK 3939, SNK 3975, PAN 8564, NS 5655, SNK 3860 and NS 5511. Cultivars with the best physical properties were SNK 3939, SNK 3663, PAN 8061, PAN 8564, PAN 8171, SNK 3443, PAN 8446, SNK 3337, NK 286, APN 881, SNK 3883, SNK 3975, SNK 3567, PAN 8272 and PAN 8370. Good abrasive decortication milling property cultivars were APN 881, SNK 3567, SNK 3863, NK 286, ADV 5010, PAN 8564, SNK 3443, PAN 8370 and PAN 8660. Good roller milling cultivars were SNK 3883, SNK 3939, PAN 8564, NK 286 and SNK 3975. Cultivars with multi-functions were NK 286, PAN 8564 APN 881, SNK 3443, PAN 8660, SNK 3939, NS 5655 and SNK 3975 (good malting and milling).