Journal
RENEWABLE ENERGY
Volume 160, Issue -, Pages 288-296Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2020.06.118
Keywords
Natural extracts; Centroid simplex; Storage; Degradation
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The efficiency of extracts with antioxidant properties of plum pulp, black tea and green tea leaves was evaluated, analyzing the induction periods (IP) and rate constants (k) at 110 degrees C, in the 1st, 30th, 57th an 91st day of storage. Antioxidant activity was observed in all extracts, either by the rat constant decreased or by the induction period increase. The higher induction period obtained was 9.15 h for the black tea leaves extract while the lower was 6.97 h for the green tea leaves extract. The control had an average induction period of 6.95 h for the first day. The models obtained are significant and showed determination coefficients greater than 0.90 with no significance lack of fit at the level of 5%. The optimization with maximization of the induction period and minimization of the rate constant showed that the black tea extract was the most suitable to avoid oxidation. On the first day of test, the optimization indicates the mixture containing 50% of black tea and 50% of plum pulp extract as the best mixture. The optimizations provided a variation of 8.92 < IP (h) < 9.69 and 0.25 < k (h(-1)) < 0.38. (C) 2020 Elsevier Ltd. All rights reserved.
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