Antioxidant Activity of Different Extracts from Black Alder (<i>Alnus glutinosa</i>) Bark with Greener Extraction Alternative

Phenolic compounds isolated from plant biomass consist of bioactive components showing a wide range of benefits for humans, including antioxidant, antimicrobial or anti-inflammatory effects. This paper presents the potential value of black alder (<i>Alnus glutinosa</i> (L.) Gaertn. (<...

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Main Authors: Maris Lauberts, Matiss Pals
Format: article
Language:EN
Published: MDPI AG 2021
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Online Access:https://doaj.org/article/6a53fb99f17b4d4b95303c486ef9d4cc
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spelling oai:doaj.org-article:6a53fb99f17b4d4b95303c486ef9d4cc2021-11-25T18:47:26ZAntioxidant Activity of Different Extracts from Black Alder (<i>Alnus glutinosa</i>) Bark with Greener Extraction Alternative10.3390/plants101125312223-7747https://doaj.org/article/6a53fb99f17b4d4b95303c486ef9d4cc2021-11-01T00:00:00Zhttps://www.mdpi.com/2223-7747/10/11/2531https://doaj.org/toc/2223-7747Phenolic compounds isolated from plant biomass consist of bioactive components showing a wide range of benefits for humans, including antioxidant, antimicrobial or anti-inflammatory effects. This paper presents the potential value of black alder (<i>Alnus glutinosa</i> (L.) Gaertn. (<i>Betulaceae</i>)) bark for the production of biologically active substances, despite its current use as a low value fuel source. Most of the extraction methods employ neat organic solvents to obtain extracts with a high antioxidant potential from biomass. The aim of this work is to show the advantages and disadvantages of the extraction process by taking into account the principles of ‘green chemistry’ and replacing the organic solvents with ‘green’ solvent water. Using the advantages of accelerated solvent extraction (ASE), it has been shown that the use of deionized water has the prospect of replacing organic solvents. In the case of the one-step water extraction, the total polyphenol content (TPC) varies from 0.55 to 0.62 Gallic acid equivalent (GAE) g/g in the extracts, depending on the temperature, whereas with the result of the sequential extraction with the organic solvents, the TPC content of the 40% (v:v) ethanol extracts ranges from 0.39 to 0.61 GAE g/g, depending on the temperature. The influence of the total polyphenol content and the total proanthocyanidin content on the antioxidant activity is shown. The antioxidant activity (IC<sub>50</sub>, mg/L) of the extracts obtained with the organic solvents in the (2,2-diphenyl-1-picrylhydrazyl) DPPH<sup>•</sup> test varies from 4.05 to 9.58, depending on the temperature in the range of 70–150 °C, respectively, while the results obtained with the deionized water showed promising results in the range of 6.33–7.36 in the temperature range of 70–150 °C, respectively. The extraction with the deionized water showed that approximately 90% of the substances in the extracts obtained with the organic solvents by sequential extraction are possible to obtain as deionized water extracts.Maris LaubertsMatiss PalsMDPI AGarticleextractiongreen solventorganic solventstotal phenolic contentantioxidant activityBotanyQK1-989ENPlants, Vol 10, Iss 2531, p 2531 (2021)
institution DOAJ
collection DOAJ
language EN
topic extraction
green solvent
organic solvents
total phenolic content
antioxidant activity
Botany
QK1-989
spellingShingle extraction
green solvent
organic solvents
total phenolic content
antioxidant activity
Botany
QK1-989
Maris Lauberts
Matiss Pals
Antioxidant Activity of Different Extracts from Black Alder (<i>Alnus glutinosa</i>) Bark with Greener Extraction Alternative
description Phenolic compounds isolated from plant biomass consist of bioactive components showing a wide range of benefits for humans, including antioxidant, antimicrobial or anti-inflammatory effects. This paper presents the potential value of black alder (<i>Alnus glutinosa</i> (L.) Gaertn. (<i>Betulaceae</i>)) bark for the production of biologically active substances, despite its current use as a low value fuel source. Most of the extraction methods employ neat organic solvents to obtain extracts with a high antioxidant potential from biomass. The aim of this work is to show the advantages and disadvantages of the extraction process by taking into account the principles of ‘green chemistry’ and replacing the organic solvents with ‘green’ solvent water. Using the advantages of accelerated solvent extraction (ASE), it has been shown that the use of deionized water has the prospect of replacing organic solvents. In the case of the one-step water extraction, the total polyphenol content (TPC) varies from 0.55 to 0.62 Gallic acid equivalent (GAE) g/g in the extracts, depending on the temperature, whereas with the result of the sequential extraction with the organic solvents, the TPC content of the 40% (v:v) ethanol extracts ranges from 0.39 to 0.61 GAE g/g, depending on the temperature. The influence of the total polyphenol content and the total proanthocyanidin content on the antioxidant activity is shown. The antioxidant activity (IC<sub>50</sub>, mg/L) of the extracts obtained with the organic solvents in the (2,2-diphenyl-1-picrylhydrazyl) DPPH<sup>•</sup> test varies from 4.05 to 9.58, depending on the temperature in the range of 70–150 °C, respectively, while the results obtained with the deionized water showed promising results in the range of 6.33–7.36 in the temperature range of 70–150 °C, respectively. The extraction with the deionized water showed that approximately 90% of the substances in the extracts obtained with the organic solvents by sequential extraction are possible to obtain as deionized water extracts.
format article
author Maris Lauberts
Matiss Pals
author_facet Maris Lauberts
Matiss Pals
author_sort Maris Lauberts
title Antioxidant Activity of Different Extracts from Black Alder (<i>Alnus glutinosa</i>) Bark with Greener Extraction Alternative
title_short Antioxidant Activity of Different Extracts from Black Alder (<i>Alnus glutinosa</i>) Bark with Greener Extraction Alternative
title_full Antioxidant Activity of Different Extracts from Black Alder (<i>Alnus glutinosa</i>) Bark with Greener Extraction Alternative
title_fullStr Antioxidant Activity of Different Extracts from Black Alder (<i>Alnus glutinosa</i>) Bark with Greener Extraction Alternative
title_full_unstemmed Antioxidant Activity of Different Extracts from Black Alder (<i>Alnus glutinosa</i>) Bark with Greener Extraction Alternative
title_sort antioxidant activity of different extracts from black alder (<i>alnus glutinosa</i>) bark with greener extraction alternative
publisher MDPI AG
publishDate 2021
url https://doaj.org/article/6a53fb99f17b4d4b95303c486ef9d4cc
work_keys_str_mv AT marislauberts antioxidantactivityofdifferentextractsfromblackalderialnusglutinosaibarkwithgreenerextractionalternative
AT matisspals antioxidantactivityofdifferentextractsfromblackalderialnusglutinosaibarkwithgreenerextractionalternative
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