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Extraction of natural antioxidants from strawberry guava leaf by conventional and non-conventional techniques
Chemical Engineering Communications ( IF 1.9 ) Pub Date : 2020-04-22 , DOI: 10.1080/00986445.2020.1755658
Jaina Mara Pigosso Coelho 1 , Gracielle Johann 2 , Edson Antonio da Silva 1 , Fernando Palú 1 , Melissa Gurgel Adeodato Vieira 3
Affiliation  

Abstract

Natural extracts of strawberry guava leaf were obtained using the following techniques: supercritical CO2 extraction (at 14, 17, and 20 MPa and 35, 45, and 55 °C); dynamic maceration with hexane solvent; Soxhlet extraction; ultrasound-assisted extraction (at 40, 50, and 60 °C; 100, 300, and 500 W; 1:10, 15, and 20 g mL−1), and supercritical extraction followed by ultrasound. Yield results were 3.59% for Soxhlet extraction, 2.68% for ultrasound-assisted extraction, 1.46% for ultrasound re-extraction after supercritical extraction, 0.98% for dynamic maceration, and 0.86% for supercritical CO2 extraction. Natural extracts of strawberry guava leaves obtained via supercritical extraction were found to be rich in eudesmol, squalene, and vitamin E, in 11.03, 19.44, and 53.42% percentages, respectively. They also exhibited high antioxidant activity, 26.15 μg mL−1. This result was directly related to the α-tocopherol present in vitamin E.



中文翻译:

常规和非常规技术从草莓番石榴叶中提取天然抗氧化剂

摘要

草莓番石榴叶的天然提取物使用以下技术获得:超临界 CO 2提取(在 14、17 和 20 MPa 和 35、45 和 55 °C 下);用己烷溶剂动态浸渍;索氏提取;超声辅助萃取(在 40、50 和 60 °C;100、300 和 500 W;1:10、15 和 20 g mL -1)和超临界萃取,然后进行超声。索氏提取的产率为 3.59%,超声辅助提取的产率为 2.68%,超临界萃取后超声再提取的产率为 1.46%,动态浸渍的产率为 0.98%,超临界 CO 2 的产率为 0.86%萃取。发现通过超临界萃取获得的草莓番石榴叶天然提取物分别富含 eudesmol、角鲨烯和维生素 E,百分比分别为 11.03、19.44 和 53.42%。它们还表现出高抗氧化活性,26.15 μg mL -1。这一结果与维生素 E 中存在的 α-生育酚直接相关。

更新日期:2020-04-22
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