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Food Science and Biotechnology
→ Food Science and Biotechnology 2019 ; 28(2): 355-364
A comprehensive analysis and comparison between vacuum and electric oven drying methods on Chinese saffron (Crocus sativus L.)
Chong Yao1,2, Xiao-Dong Qian2, Gui-Fen Zhou3, Shu-Wei Zhang4, Li-Qin Li2, Qiao-Sheng Guo1
1Institute of Chinese Medicinal Materials, Nanjing Agricultural University, No. 1 Weigang Nanjing, Nanjing 210095, Jiangsu Province, People’s Republic of China, 2Pharmaceutical Department, Huzhou Central Hospital, Huzhou 313000, People’s Republic of China, 3Pharmaceutical College, Zhejiang Chinese Medical University, Hangzhou 310053, People’s Republic of China, 4Laboratory for Functional Foods and Human Health, Center for Excellence in Post-Harvest Technologies, North Carolina Agricultural and Technical State University, North Carolina Research Campus, 500 Laureate Way, Kannapolis, NC 28081, USA
ABSTRACT
The red stigmas of saffron are one of the most expensive spices in the world and serve as a traditional Chinese medicine. More saffron has been cultivated in China, and different drying technologies have been studied. However, a comprehensive and comparative analysis of different drying approaches has not been well studied. In this study, we compared electric oven and vacuum oven drying approaches on saffron. We found saffron was dried quicker under high vacuum drying mode with high temperature and the quicker drying rate provided, the more open microstructural interstices on the saffron surface. Both methods were best fit to Midilli and Kucuk model. Besides, the coloring, aroma and bitterness strength after drying showed the similar results. In sum, our data suggested the optimal drying temperature was 100 °C for 20 min for two evaluated methods, however considering the machine cost, the electric oven drying would be the first choice.
KEYWORD
Saffron, Thin layer drying, Kinetic model, Vacuum oven dry, Electric oven dry
Food Science and Biotechnology 2019 ; 28(2): 355-364
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