Articles

RELATIONSHIP BETWEEN RESPIRATION ACTIVITY AND ASCORBIC ACID CONTENT IN SPINACH LEAVES AT VARIOUS TEMPERATURE CONDITIONS

Article number
712_106
Pages
817 – 822
Language
English
Abstract
Recently, the internal qualities of fresh produce are increasingly important and a reliable predictive quality model has become more necessary.
In order to construct a mathematical model for predicting quality of postharvest fresh spinach, we measured the respiration rate (as carbon dioxide production rate) and ascorbic acid content under storage condition at 5, 10, 20 and 30ºC. Relative ascorbic acid content (AsArel) obtained in all temperature conditions were plotted versus corresponding accumulated amount of respiratory activity (ARCO2) which was calculated by integrating the respiration curve at each measuring point.
This graph pattern illustrated that AsArel in all storage temperature decreased exponentially as a function of ARCO2. The more ARCO2 (as the higher CO2 production rate) was, the higher the rate of loss of AsArel. We could successfully express such quantitative relationship by exponential equation with the same degradation constant rate of 3.464 x 10-5 ± 0.156 x 10-5 (R2 = 0.89). This finding suggests that ARCO2 could be a useful guide parameter to predict the remaining ascorbic acid in spinach leaves during storage at various temperature conditions (R2 = 0.90).

Publication
Authors
C. Techavuthiporn, K. Nakano, S. Maezawa
Keywords
Fresh-cut, respiratory activity, quality, modeling
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