The Establishment of Ultrasonic-Assisted Extraction for the Recovery of Phenolic Compounds and Evaluation of Their Antioxidant Activity from Leaves.

Foods

Institute of Nutrition and Food Technology 'José Mataix', Biomedical Research Center, University of Granada, Avda del Conocimiento sn., 18100 Granada, Spain.

Published: January 2022

AI Article Synopsis

  • Phenolic compounds found in leaves have health benefits and were optimized for extraction in this study using ultrasonic-assisted techniques.
  • The study used Box-Behnken design to identify ideal conditions for extracting these compounds, determining the best combination of 40% ethanol, a 1/400 solvent/sample ratio, and 35 minutes of extraction time.
  • The extraction yielded 21 phenolic compounds, including protocatechuic acid-glucoside, caffeoylquinic acid, and flavonols like quercetin-3-O-6-acetylglucoside and rutin, which comprised over 7% of the total phenolic content.

Article Abstract

Phenolic compounds of leaves are bioactive compounds with beneficial properties for human health. Therefore, in this study, an optimization of ultrasonic assisted extraction by Box-Behnken design was used for the first time to optimize factors such as the percentage of ethanol, ratio solvent/sample (/) and extraction time to reach the highest phenolic compound amounts (evaluated by HPLC-MS) while also evaluating in vitro antioxidant activity using DPPH, ABTS and FRAP assays. The optimal extraction conditions were 40% ethanol, 1/400 (/) and 35 min. Applying these optimal conditions, which were identified and quantified by HPLC-MS, resulted in the extraction of 21 phenolic compounds. According to these results, the main phenolic compounds in leaves are the phenolic glycoside and phenolic acid named protocatechuic acid-glucoside and caffeoylquinic. In addition, leaf extract contains flavonols such quercetin-3-O-6-acetylglucoside and rutin, which represent more than 7% of its total phenolic content.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8834592PMC
http://dx.doi.org/10.3390/foods11030314DOI Listing

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