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Ultrasound-assisted conversion of tannic acid to gallic acid as a strategy to obtain value-added products

In this work, ultrasound was applied for the conversion of tannic acid into gallic acid using only diluted H(2)O(2) as reagent. Experiments were carried out using several types of ultrasonic horns operating at 20 kHz (VC750W processor). The following experimental conditions were evaluated: H(2)O(2)...

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Autores principales: Santos, Daniel, Hagemann Cauduro, Vitoria, Wohlmann, Wilian, Bizzi, Cezar A., Mello, Paola A., Flores, Erico M.M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7803818/
https://www.ncbi.nlm.nih.gov/pubmed/33388694
http://dx.doi.org/10.1016/j.ultsonch.2020.105442
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author Santos, Daniel
Hagemann Cauduro, Vitoria
Wohlmann, Wilian
Bizzi, Cezar A.
Mello, Paola A.
Flores, Erico M.M.
author_facet Santos, Daniel
Hagemann Cauduro, Vitoria
Wohlmann, Wilian
Bizzi, Cezar A.
Mello, Paola A.
Flores, Erico M.M.
author_sort Santos, Daniel
collection PubMed
description In this work, ultrasound was applied for the conversion of tannic acid into gallic acid using only diluted H(2)O(2) as reagent. Experiments were carried out using several types of ultrasonic horns operating at 20 kHz (VC750W processor). The following experimental conditions were evaluated: H(2)O(2) concentration (0.2 to 8.5 mol L(−1)), horn type (10 to 25 mm of diameter), ultrasound amplitude (20 to 70%), sonication time (10 to 45 min), tannic acid concentration (170 to 1360 mg L(−1)), and reaction temperature (50 to 90 °C). Gallic acid production was monitored with ultra-performance liquid chromatography with high-resolution time-of-flight mass spectrometry (UPLC-ToF-MS). The isolated gallic acid was confirmed with nuclear magnetic resonance ((1)H and (13)C NMR). It is important to emphasize that this study was developed as a proof of concept to demonstrate the potential of ultrasound for tannic acid conversion into gallic acid using just diluted H(2)O(2). Under selected conditions gallic acid production yield was 128 ± 4 mg g(−1) of initial tannic acid (using 170 mg L(−1) of tannic acid as starting material). Reaction time was set as 30 min, which was carried out using 1 mol L(−1) H(2)O(2) and ultrasound amplitude of 50% at 90 °C. At silent conditions (mechanical stirring, from 100 to 1000 rpm), gallic acid production was halved (less than 78 ± 4 mg g(−1) of initial tannic acid).
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spelling pubmed-78038182021-01-22 Ultrasound-assisted conversion of tannic acid to gallic acid as a strategy to obtain value-added products Santos, Daniel Hagemann Cauduro, Vitoria Wohlmann, Wilian Bizzi, Cezar A. Mello, Paola A. Flores, Erico M.M. Ultrason Sonochem Short Communication In this work, ultrasound was applied for the conversion of tannic acid into gallic acid using only diluted H(2)O(2) as reagent. Experiments were carried out using several types of ultrasonic horns operating at 20 kHz (VC750W processor). The following experimental conditions were evaluated: H(2)O(2) concentration (0.2 to 8.5 mol L(−1)), horn type (10 to 25 mm of diameter), ultrasound amplitude (20 to 70%), sonication time (10 to 45 min), tannic acid concentration (170 to 1360 mg L(−1)), and reaction temperature (50 to 90 °C). Gallic acid production was monitored with ultra-performance liquid chromatography with high-resolution time-of-flight mass spectrometry (UPLC-ToF-MS). The isolated gallic acid was confirmed with nuclear magnetic resonance ((1)H and (13)C NMR). It is important to emphasize that this study was developed as a proof of concept to demonstrate the potential of ultrasound for tannic acid conversion into gallic acid using just diluted H(2)O(2). Under selected conditions gallic acid production yield was 128 ± 4 mg g(−1) of initial tannic acid (using 170 mg L(−1) of tannic acid as starting material). Reaction time was set as 30 min, which was carried out using 1 mol L(−1) H(2)O(2) and ultrasound amplitude of 50% at 90 °C. At silent conditions (mechanical stirring, from 100 to 1000 rpm), gallic acid production was halved (less than 78 ± 4 mg g(−1) of initial tannic acid). Elsevier 2020-12-24 /pmc/articles/PMC7803818/ /pubmed/33388694 http://dx.doi.org/10.1016/j.ultsonch.2020.105442 Text en © 2020 The Authors http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Short Communication
Santos, Daniel
Hagemann Cauduro, Vitoria
Wohlmann, Wilian
Bizzi, Cezar A.
Mello, Paola A.
Flores, Erico M.M.
Ultrasound-assisted conversion of tannic acid to gallic acid as a strategy to obtain value-added products
title Ultrasound-assisted conversion of tannic acid to gallic acid as a strategy to obtain value-added products
title_full Ultrasound-assisted conversion of tannic acid to gallic acid as a strategy to obtain value-added products
title_fullStr Ultrasound-assisted conversion of tannic acid to gallic acid as a strategy to obtain value-added products
title_full_unstemmed Ultrasound-assisted conversion of tannic acid to gallic acid as a strategy to obtain value-added products
title_short Ultrasound-assisted conversion of tannic acid to gallic acid as a strategy to obtain value-added products
title_sort ultrasound-assisted conversion of tannic acid to gallic acid as a strategy to obtain value-added products
topic Short Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7803818/
https://www.ncbi.nlm.nih.gov/pubmed/33388694
http://dx.doi.org/10.1016/j.ultsonch.2020.105442
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