Structural and Physicochemical Properties of Common Buckwheat Starch in Response to Different Fertilization Levels

Abstract

Abstract Buckwheat is a typical medicinal and edible crop with high nutritional value, and the application of appropriate fertilizer can improve the quality of buckwheat starch. The changes of internal structure and physicochemical characteristics of common buckwheat grain starch under low, medium and high fertilization levels were investigated. With increasing fertilizer amount, the volume proportion increased, while the granule size distribution reduced significantly. All of the common buckwheat starch samples showed a typical A‐type pattern in X‐ray diffraction detection. Furthermore, with the increase of fertilization level, the amylose content, retrogradation, and the ratio of 1045/1022 cm −1 certainly reduced and then raised, but the relative crystallinity, the ratio of 1022/995 cm −1 ratio, light transmittance, solubility, and swelling power increased and then decreased. In comparison to other fertilization levels, common buckwheat starch at the medium level had greater pasting temperatures and gelatinization enthalpy but lower pasting viscosities. These results indicated the medium fertilization level of 180 (N), 115.2 (P) and 84.6 (K) kg/hm 2 was more suitable for buckwheat starch quality, which could give information for buckwheat cultivation. This article is protected by copyright. All rights reserved