Abstract
In this study, tropical acerola and jambolan pomaces were submitted to four water-based polyphenol extraction methods: conventional solid-liquid extraction CSLE; heated conventional solid-liquid extraction HCSLE; static ultrasound-assisted extraction SUAE; and ultrasound-assisted extraction and mechanical stirring UAES. Our objective was to evaluate and compare the extraction protocols regarding their performance, extraction kinetics, mathematical modelling, and environmental viability using the life cycle assessment (LCA) tool. The highest total polyphenol content was obtained by UAES after 90 min (1,606.8 mg GAE/100g for acerola and 1,580.7 mg GAE/100g for jambolan). These results are significantly higher (p ≤ 0.05) compared to CSLE (1,296.4 mg GAE/100g for acerola, 644.1 mg GAE/100g for jambolan). The Power Law model showed the best experimental fit compared to Peleg's and second-order models. Regarding the environmental viability, the LCA tool revealed that UAES had the lowest environmental impact among all extraction protocols, mainly due to its lower energy consumption. Overall, the combination of mechanical stirring and ultrasound improved water-based polyphenol extraction rates with reduced energy consumption. This study shows UAES as an environmentally friendly strategy to achieve efficient extraction of naturally occurring polyphenols from tropical fruit pomaces.
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