Navegando por Autor "Borem, Aluizio"

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    Evidences for a third class of starch granules in Barley
    (Revista Ceres, 1997-07) Borem, Aluizio; Rasmusson, Donald D.; Fulcher, Gary
    Starch constitutes 60-64% of barley grains, and occurs in the form of granules which range in size from 1 to 48 um in diameter and traditionally are considered to fall into two major size classesThe objective of this study was to investigate starch granule size distribution in mature kemels of Alexis, Condºr and Excel barley cultivars. A non-linear least square curve fitting technique was used to study granule diameter distributions. The curve fitting procedure revealed a trimodal distribution of starch granules, characterized by three Gaussian curves, indicating three classes of granules, A, B and C. The A granule distribution was distinct from B and C granule distributions, while there was substantial overlap between B and C granule distributions. On average, A granules were characterized by a curve with peak center at a diameter of 18.68 um, while B and C granules had peak centers at 2.60 pm and 1.42 um, respectively. A, B, and C granules were 9,4%, 75 3% and 153% of the total number of granules, respectively. These results suggest the existence of three classes of starch granules rather than the widely accepted two classes.