The Optimum Drying Models for Different Drying Methods of Chimonobambusa utilis Shoots and Their Effects on Appearance Quality of Dried Bamboo Shoot
[Objective]The effects of different drying methods on the comprehensive appearance quality of dried Chimonobambusa utilis shoots were explored to provide the theoretical basis for the drying process of C.utilis shoots.[Method]Taking fresh C.utilis shoots as raw materials,five drying methods including hot air drying,far infrared drying,vacuum drying,infrared drying and low temperature vacuum freeze-drying were used to prepare dried C.utilis shoots,and then the dried curves of C.utilis shoots under five drying methods were fitted by adopting six common drying kinetic mathematical models,and the optimum mathematical models for each drying methods were screened,finally the color,rehydration ratio,browning degree and appearance quality after rehydration of C.utilis shoots under five drying methods were analyzed.[Result]R2(determination coefficient)of five drying models,including hot air drying Slogistic1 model,far infrared drying Cubic model,low temperature vacuum freeze-drying Slogistic1 model,vacuum drying Cubic model and infrared drying Cubic model,were all above 0.98,which could better reflect the variation of moisture with drying time in the corresponding drying methods.Meanwhile,they were the optimum mathematical models for the corresponding drying methods.The degree browning of dried C.utilis shoots was the lowest in far infrared drying method,which was 0.16.The rehydration rate of low temperature vacuum freeze-drying method was the highest,which was 12.14.The color difference of low temperature vacuum freeze-drying method was the lowest of 18.22,which was the closest to the color of fresh shoots.The appearance quality of low temperature vacuum freeze-drying method was the best,followed by hot air drying method.[Conclusion]Comprehensively analyzing the economic value and the appearance quality of the product(dried C.utilis shoot)after rehydration,hot air drying and far infrared drying methods are the best drying methods for C.utilis shoots.
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