Technological advancements in millet dehulling and polishing process: An insight into pretreatment methods, machineries and impact on nutritional quality

作     者：Shagolshem Mukta Singh Jayasree Joshi T P.Srinivasa Rao Shagolshem Mukta Singh;Jayasree Joshi T;P.Srinivasa Rao

作者机构：Agricultural and Food Engineering DepartmentIndian Institute of Technology KharagpurKharagpurWest Bengal 721302India 

出 版 物：《Grain & Oil Science and Technology》 (粮油科技（英文版）)

年 卷 期：2024年第7卷第3期

页      面：186-195页

核心收录：

学科分类：0832[工学-食品科学与工程（可授工学、农学学位）] 08[工学] 083202[工学-粮食、油脂及植物蛋白工程] 

基　　金：the Indian Institute of Technology  Kharagpur  West Bengal  721302  for providing technical and financial support for the research 

主　　题：Millets Dehulling Polishing Pretreatment Novel thermal and non-thermal techniques 

摘      要：Millets are widely recognized for their nutritional significance;however, the methods employed for their processing are currently lacking. This article primarily focuses on the advanced technologies and progressions in millet dehulling and polishing. These technologies operate based on the fundamental principles of compression-shearing, abrasion-friction, and centrifugal-impact forces. Processing of millets can be challenging because of the physical characteristics and tight attachment of hull and bran to the endosperm. However, several dehullers have been designed to solve this problem for different kinds of millets. In addition, the nutritional and anti-nutritional characteristics undergo alterations due to both dehulling and polishing processes. These alterations are thoroughly examined and discussed in this article. Specifically, anti-nutrients such as tannins and phytate are predominantly found in the outer pericarp of the grain and experience a reduction after undergoing dehulling and polishing. The nutritional properties are also subjected to a reduction;however, this reduction can be mitigated by subjecting the grains to certain pretreatments before dehulling and polishing. These treatments serve to enhance dehulling efficiency and nutrient digestibility while simultaneously reducing the presence of anti-nutrients. Novel thermal and non-thermal methodologies such as microwave, hydrothermal, high-pressure processing, and ohmic heating can be employed for processing millets, thereby diminishing the loss of nutrients. Additional research can be carried out to investigate their impact on the dehulling and polishing of millets.