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Pilot‐scale radio frequency pasteurisation of chili powder: heating uniformity and heating model
Author(s) -
Li Yukun,
Zhang Yongdi,
Lei Yujie,
Fu Hongfei,
Chen Xiangwei,
Wang Yunyang
Publication year - 2016
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.7581
Subject(s) - pasteurization , radio frequency , environmental science , dielectric heating , correlation coefficient , heating system , materials science , optoelectronics , food science , statistics , chemistry , mathematics , telecommunications , computer science , dielectric , mechanical engineering , engineering
Abstract BACKGROUND Microbial contamination is a vital obstacle needed to overcome for food safety of condiments. Radio frequency ( RF ) pasteurisation is a new technology to solve this obstacle. Temperature distribution and heating uniformity of sample, which are influenced by different factors, are the most important things affecting the nutritional ingredients and microbial safety of sample in the process of RF pasteurisation. This study demonstrated the location of cold spot in chili powder by analysing temperature distribution in horizontal and vertical direction. The related models were established and the accuracy was verified. RESULTS Cold spot located on the centre of sample surface in the process of RF pasteurisation. The averaged temperature of sample increased linearly. The uniformity index decreased as the averaged temperature increased. Both the correlation coefficient of two equations were greater than 0.91. The error value of heating rate and heating uniformity index was 0.54% and 0.75% between the measured value and predicted value. CONCLUSION Electric field was not uniformly distributed between RF parallel‐plate electrodes in the RF pasteurisation of chili powder. The heating models were reliable to predict experiment results with high precision and accuracy. © 2015 Society of Chemical Industry