State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A & F University, Yangling, Shaanxi Province 712100, China; Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Gent, Belgium.
State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A & F University, Yangling, Shaanxi Province 712100, China.
Food Chem. 2022 Sep 30;389:132664. doi: 10.1016/j.foodchem.2022.132664. Epub 2022 Mar 9.
Nitrogen is an essential element for the yield and quality of grain. In this study, the structural and physicochemical properties of two common buckwheat varieties under four nitrogen levels (0, 90, 180, 270 kg N ha) at one location in two years were investigated. With increasing nitrogen level, the contents of moisture and amylose decreased but the contents of ash and crude protein increased. Excessive nitrogen application significantly increased the granule size, but reduced the light transmittance, water solubility, swelling power, absorption of water and oil. All the samples showed a typical A - type pattern, while high relative crystallinity and low order degree were observed under high nitrogen level. The samples under high nitrogen level had lower textural properties, pasting properties and rheological properties but higher pasting temperature and gelatinization enthalpy. These results indicated that nitrogen fertilizer significantly affected the structural and physicochemical properties of common buckwheat starch.
氮是影响谷物产量和品质的重要元素。本研究以两年间同一地点的两个普通荞麦品种为试材，设置 0、90、180、270kg/hm2 四个氮素水平，研究了氮素水平对其结构和理化性质的影响。随着氮素水平的增加，荞麦的水分和直链淀粉含量降低，灰分和粗蛋白含量增加。过量施氮显著增大了颗粒粒径，但降低了透光率、水溶性、膨胀度、吸水性和吸油性。所有样品均表现出典型的 A 型结晶模式，而高氮水平下则表现出相对较高的结晶度和较低的有序度。高氮水平下的样品具有较低的质构特性、糊化特性和流变学特性，但具有较高的糊化温度和凝胶化焓。这些结果表明，氮肥显著影响了普通荞麦淀粉的结构和理化性质。
