PJB-2018-365
GRANULE SIZE DISTRIBUTION AND PASTING PROPERTIES OF STARCH IN NORMAL, WAXY AND SWEET MAIZE KERNELS
WENYANG LI
Abstract
The objective of this study was to investigate the granule size distribution and pasting properties of starch and their relationships in maize kernels. A clear bimodal distribution of granule sizes was shown in six maize cultivars. A number of granules in maize kernels were made up of small starch granules. Normal maize had a smaller proportion of granules < 12 μm and a greater proportion of granules > 12 μm, whereas sweet maize had a greater proportion of granules < 12 μm and a smaller proportion of granules > 12 μm. The peak, trough and breakdown viscosities were higher in waxy maize and lower in sweet maize. The final and setback viscosities were higher in normal maize and lower in sweet maize. The higher peak, trough, final and setback viscosities were significantly negatively correlated to volume percentage of granules < 12 µm and significantly positively correlated with the volume percentage of granules > 12 µm.
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