Microwave-assisted extraction of bioactive compounds from cashew apple (Anacardium occidenatale L.) bagasse: modeling and optimization of the process using response surface methodology
2021
Patra, Abhipriya | Abdullah, S. | Pradhan, Rama Chandra
This study explores the impact of microwave treatment on bioactive compounds of cashew apple bagasse (CAB). The primary objective was to develop a process with optimized conditions for the microwave-assisted extraction (MAE) of bioactive compounds from CAB with maximum yield using a Box-Behnken design of response surface methodology. The independent variables were microwave power (280 to 580 W), treatment time (30 to 120 s), and bagasse/solvent ratio (1:15 to 1:30 w/v). The ANOVA results showed that total phenolic content, DPPH radical scavenging activity, protein content, tannin content, and ascorbic acid content were impacted, in different intensities, by all the independent parameters with a good agreement between the predicted and experimental values. Microwave power of 560 W, treatment time of 110 s, and bagasse/solvent ratio of 1:30 (w/v) were obtained as the optimum conditions for maximum extraction of total phenolic content (41.01 ± 2.11 mg GAE/g), antioxidant activity (91.96 ± 0.92% radical scavenging activity), protein content (166.25 ± 2.75 mg/g), tannin content (81.17 ± 1.84 µg tannic acid/g), and ascorbic acid content (2.39 ± 0.62 mg/g). Moreover, while compared to untreated extraction, microwave treatment significantly increased the yield of all the bioactive compounds and minerals content of CAB. Hence, this could be a promising technology for the extraction of bioactive compounds from CAB.
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