Abstract
The changes in the main nutrient and medicinal components during the storage of the Chinese yam (Dioscorea opposita) tubers were studied. The harvested tubers were stored under ambient conditions (10 °C to 18 °C, 60 % to 80 % Relative Humidity) and cold temperature and packaged conditions (4 °C, 60 % to 65 % Relative Humidity) for 45 day. The allantoin, starch, total alcohol-soluble sugar, reducing sugar, protein, and moisture contents of the samples were evaluated. Their amylase activities were also investigated. Results of ambient conditions indicated that, during storage, moisture decreased by 67.96 % to 56.51 %, and total sugars, reducing sugars, and protein increased by 6.49 % to 9.81 %, 1.7 % to 2.27 %, and 13.02 % to 14.55 %, respectively. Starch and enzyme activities increased during the early days of storage and progressively decreased, and the content of allantoin changed in volatility. The changes were more significant at cold temperatures and packaged conditions than at ambient conditions. This result suggests that after-ripening occurred in the early stages of Chinese yam tubers, which positively affected the nutritional potential of the tubers by a marked increase in nutrients. Low-temperature sweetening greatly affects the nutritional potential of tubers by a series of complicated interactions between starch and sugars at 4 °C.
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Acknowledgments
The authors would like to thank the referees for their valuable comments and suggestions. This work was supported by the National Natural Science Foundation of China (No. 30472148). We are also thankful to the research center of Tianjin University of Traditional Chinese Medicine for providing the use of experimental instruments and materials for a low charge.
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Zhang, Z., Gao, W., Wang, R. et al. Changes in main nutrients and medicinal composition of Chinese yam (Dioscorea opposita) tubers during storage. J Food Sci Technol 51, 2535–2543 (2014). https://doi.org/10.1007/s13197-012-0776-y
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DOI: https://doi.org/10.1007/s13197-012-0776-y