Affiliation:
1. Centre of Excellence in Grain Science National Institute of Food Technology, Entrepreneurship and Management, Thanjavur (NIFTEM‐T), Ministry of Food Processing Industries, Government of India Thanjavur India
2. Department of Food Safety and Quality Testing National Institute of Food Technology, Entrepreneurship and Management, Thanjavur (NIFTEM‐T), Ministry of Food Processing Industries, Government of India Thanjavur India
3. Department of Food Engineering National Institute of Food Technology, Entrepreneurship and Management, Thanjavur (NIFTEM‐T), Ministry of Food Processing Industries, Government of India Thanjavur India
Abstract
AbstractOhmic heating (OH), a novel thermal technique could be utilized for paddy parboiling to improve milled rice quality. In this research, two paddy varieties (one traditional and one modern variety) were subjected to OH at different salt concentrations (0%, 0.3%, 0.5%, 0.7%, and 0.9%) and voltage gradients (10, 12, 14, 16, and 18 V/cm) and their influence on thermal profile, electrical conductivity (EC), milled rice quality, and nutritional profile were studied in comparison to the conventional steaming method. A factorial design was used to determine the effect of variety, voltage gradient and holding time on head rice yield (HRY), hardness and color difference of parboiled milled rice. Results indicated the significance of salt and voltage on processing time and HRY. On increasing, both enhanced the EC and heating rate leading to a great reduction in parboiling duration whereas HRY increased on lowering the voltage. High significant effects were observed between the factors for HRY and color. The maximum HRY and hardness were obtained for OH at 0.7% salt and 12 V/cm. This treatment when compared to steaming, consumed less energy, and provided less chalkiness, better HRY and hardness for both varieties to a greater extent. OH also positively impacted the nutritional profile of parboiled rice as it retained more protein and fat than the conventional method. These results reveal the superiority of OH in providing a significant favorable impact on the parboiled milled rice quality and has a great potential to be used for paddy parboiling.Practical applicationsOhmic heating is an emerging thermal technique having the potential for rapid uniform heating. In this study, OH was utilized for paddy parboiling by incorporating electrolytes for replacing the conventional steaming method. Steaming requires a boiler for generating steam, which adds to the processing cost and equipping OH eliminates the need for a boiler. This will save water, energy, space, manpower, and maintenance requirements. OH also reduces the parboiling duration, while improving parboiled rice quality. The ohmic behavior of paddy will also facilitate the design of continuous ohmic systems for paddy parboiling which can be immensely useful in the rice processing industry.
Funder
Ministry of Food Processing Industries
Subject
General Chemical Engineering,Food Science
Reference65 articles.
1. Field performance evaluation of different rice threshing methods;Alizadeh M. R.;International Journal of Natural and Engineering Sciences,2009
2. Thermal Characteristics of Ohmically Heated Rice Starch and Rice Flours
3. Cereal grains for the food and beverage industries
4. Morphological, Physical, and Chemical Properties of Grain and Flour from Chalky Rice Mutants
5. Rice grain dimensions influence milling and head rice recoveries;Bandonill E. H.;Philippine Journal of Crop Science (Philippines),2012