{"title":"Effect of nitrogen fertilizer on proso millet starch structure, pasting, and rheological properties","authors":"Honglu Wang, Hui Zhang, Qian Ma, Enguo Wu, Aliaksandr Ivanistau, Baili Feng","doi":"10.1016/j.jia.2024.02.015","DOIUrl":null,"url":null,"abstract":"Nitrogen fertilizer is an important agronomic measure that greatly affects crop yield and grain quality. This two-year study aimed to explore the effects of four nitrogen levels on the morphology, lamellar and crystalline structure, pasting, and rheological properties of proso millet (PM) starch, and to investigate potential food applications of PM. The results showed that the starch surface became uneven and the structure of the starch granules shifted towards greater complexity with increasing nitrogen level. Nitrogen increased the relative crystallinity, ordered structure, and average repeat distance, leading to a stable starch structure and contributing to a higher gelatinization enthalpy. Furthermore, nitrogen significantly increased peak, breakdown, setback, and final viscosities but decreased apparent amylose content, which caused the shear resistance and storage capacity of PM starch-based foods to deteriorate during processing and transport. Rheological analysis showed that PM starch exhibited the typical characteristics of a pseudoplastic fluid. Under nitrogen treatment, PM starch gels showed high potential for application in 3D printing products due to a high resistance to shear thinning, gel strength, and yield stress, presumably owing to the significantly higher G′ than G′′, and the lower amylose content, which in turn promoted the formation of a stable network structure in water to immobilize more water. Our study provides a reference for the application of PM starch in the food industry and for the development of PM cropping-management programs to improve quality.","PeriodicalId":16305,"journal":{"name":"Journal of Integrative Agriculture","volume":"6 1","pages":""},"PeriodicalIF":4.6000,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Integrative Agriculture","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1016/j.jia.2024.02.015","RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRICULTURE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Nitrogen fertilizer is an important agronomic measure that greatly affects crop yield and grain quality. This two-year study aimed to explore the effects of four nitrogen levels on the morphology, lamellar and crystalline structure, pasting, and rheological properties of proso millet (PM) starch, and to investigate potential food applications of PM. The results showed that the starch surface became uneven and the structure of the starch granules shifted towards greater complexity with increasing nitrogen level. Nitrogen increased the relative crystallinity, ordered structure, and average repeat distance, leading to a stable starch structure and contributing to a higher gelatinization enthalpy. Furthermore, nitrogen significantly increased peak, breakdown, setback, and final viscosities but decreased apparent amylose content, which caused the shear resistance and storage capacity of PM starch-based foods to deteriorate during processing and transport. Rheological analysis showed that PM starch exhibited the typical characteristics of a pseudoplastic fluid. Under nitrogen treatment, PM starch gels showed high potential for application in 3D printing products due to a high resistance to shear thinning, gel strength, and yield stress, presumably owing to the significantly higher G′ than G′′, and the lower amylose content, which in turn promoted the formation of a stable network structure in water to immobilize more water. Our study provides a reference for the application of PM starch in the food industry and for the development of PM cropping-management programs to improve quality.
期刊介绍:
Journal of Integrative Agriculture publishes manuscripts in the categories of Commentary, Review, Research Article, Letter and Short Communication, focusing on the core subjects: Crop Genetics & Breeding, Germplasm Resources, Physiology, Biochemistry, Cultivation, Tillage, Plant Protection, Animal Science, Veterinary Science, Soil and Fertilization, Irrigation, Plant Nutrition, Agro-Environment & Ecology, Bio-material and Bio-energy, Food Science, Agricultural Economics and Management, Agricultural Information Science.