普通、甜、糯玉米果穗不同部位籽粒淀粉理化特性和颗粒分布差异

doi:10.3724/SP.J.1006.2011.00331

Abstract

Abstract: The starch physicochemical characteristics and granule size distribution at different ear positions (apical, middle, and basal) were studied using normal, sweet, and waxy maize. The results indicated that values of viscosity characteristics for sweet maize starch were higher at apical position. Normal maize starch peak viscosity (PV) and breakdown (BD) were higher at apical position; while setback (SB) was similar for three positions. Waxy maize starch presented the highest BD at apical position; while PV and SB were similar for three positions. The transition temperature (onset-, peak-, and conclusion temperatures) was higher at basal position for sweet maize, similar among three positions for normal maize, and higher at middle position for waxy maize. The change tendency for the enthalpy of gelatinization among three ear positions was different for three types of maize. Starch granule volume distribution frequency showed a typical two-peak curve. The percentage for starch granule diameter higher than 17 μm was the lowest at apical position and the highest at middle position. Iodine binding capacity was similar among three positions for waxy maize, whereas it was the lowest at apical position for sweet and normal maize. Correlations of starch granule volume distribution and iodine binding capacity with pasting and thermal characteristics indicated that the differences for pasting and thermal characteristics among different ear positions were resulted from the differences for starch granule size distribution and chain-length.

Key words: Maize starch, Pasting property, Thermal property, Ear position, Granule size distribution, Iodine binding capacity

LIU Da-Lei, GUO Huan-Fen, DONG Ce, LIU Wei-Beng. Starch Physicochemical Characteristics and Granule Size Distribution at Apical, Middle and Basal Ear Positions in Normal, Sweet, and Waxy Maize[J].Acta Agronomica Sinica, 2011, 37(02): 331-338.

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Starch Physicochemical Characteristics and Granule Size Distribution at Apical, Middle and Basal Ear Positions in Normal, Sweet, and Waxy Maize

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