Pressurized Hot Water Extraction and Bio-Hydrogels Formulation with <i>Aristotelia chilensis</i> [Mol.] Stuntz Leaves

<i>Aristotelia chilensis</i> is a plant rich in phenolics and other bioactive compounds. Their leaves are discarded as waste in the maqui berry industry. A new application of these wastes is intended by the recovery of bioactive compounds using pressurized hot water extraction with conve...

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Autores principales:	Audrey Bianchi, Pamela R. Rivera-Tovar, Vanesa Sanz, Tania Ferreira-Anta, María Dolores Torres, José Ricardo Pérez-Correa, Herminia Domínguez
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	maqui phenolic compounds microwave heating methods gelling agent rheology Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/287a30ce788044939e9d3697a9da3901
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spelling	oai:doaj.org-article:287a30ce788044939e9d3697a9da39012021-11-11T18:25:26ZPressurized Hot Water Extraction and Bio-Hydrogels Formulation with <i>Aristotelia chilensis</i> [Mol.] Stuntz Leaves10.3390/molecules262164021420-3049https://doaj.org/article/287a30ce788044939e9d3697a9da39012021-10-01T00:00:00Zhttps://www.mdpi.com/1420-3049/26/21/6402https://doaj.org/toc/1420-3049<i>Aristotelia chilensis</i> is a plant rich in phenolics and other bioactive compounds. Their leaves are discarded as waste in the maqui berry industry. A new application of these wastes is intended by the recovery of bioactive compounds using pressurized hot water extraction with conventional or microwave heating. Both technologies have been selected for their green character regarding the type of solvent and the high efficiency in shorter operation times. Extractions were performed in the temperature range 140–200 °C with a solid/liquid ratio of 1:15 (<i>w:w</i>). The extracts’ total phenolic content, antioxidant capacity, and saccharides content obtained with both heating methods were measured. Additionally, the thermo-rheological properties of the gelling matrix enriched with these extracts were analyzed. Optimum conditions for lyophilized extracts were found with conventional heating, at 140 °C and 20 min extraction; 250.0 mg GAE/g dry extract and 1321.5 mg Trolox/g dry extract. Close to optimum performance was achieved with microwave heating in a fraction of the time (5 min) at 160 °C (extraction), yielding extracts with 231.9 mg GAE/g dry extract of total phenolics and antiradical capacity equivalent to 1176.3 mg Trolox/g dry extract. Slightly higher antioxidant values were identified for spray-dried extracts (between 5% for phenolic content and 2.5% for antioxidant capacity). The extracts obtained with both heating methods at 200 °C contained more than 20% oligosaccharides, primarily glucose. All the formulated gelling matrices enriched with the obtained extracts displayed intermediate gel strength properties. The tested technologies efficiently recovered highly active antioxidant extracts, rich in polyphenolics, and valuable for formulating gelling matrices with potential applicability in foods and other products.Audrey BianchiPamela R. Rivera-TovarVanesa SanzTania Ferreira-AntaMaría Dolores TorresJosé Ricardo Pérez-CorreaHerminia DomínguezMDPI AGarticlemaquiphenolic compoundsmicrowaveheating methodsgelling agentrheologyOrganic chemistryQD241-441ENMolecules, Vol 26, Iss 6402, p 6402 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	maqui phenolic compounds microwave heating methods gelling agent rheology Organic chemistry QD241-441
spellingShingle	maqui phenolic compounds microwave heating methods gelling agent rheology Organic chemistry QD241-441 Audrey Bianchi Pamela R. Rivera-Tovar Vanesa Sanz Tania Ferreira-Anta María Dolores Torres José Ricardo Pérez-Correa Herminia Domínguez Pressurized Hot Water Extraction and Bio-Hydrogels Formulation with <i>Aristotelia chilensis</i> [Mol.] Stuntz Leaves
description	<i>Aristotelia chilensis</i> is a plant rich in phenolics and other bioactive compounds. Their leaves are discarded as waste in the maqui berry industry. A new application of these wastes is intended by the recovery of bioactive compounds using pressurized hot water extraction with conventional or microwave heating. Both technologies have been selected for their green character regarding the type of solvent and the high efficiency in shorter operation times. Extractions were performed in the temperature range 140–200 °C with a solid/liquid ratio of 1:15 (<i>w:w</i>). The extracts’ total phenolic content, antioxidant capacity, and saccharides content obtained with both heating methods were measured. Additionally, the thermo-rheological properties of the gelling matrix enriched with these extracts were analyzed. Optimum conditions for lyophilized extracts were found with conventional heating, at 140 °C and 20 min extraction; 250.0 mg GAE/g dry extract and 1321.5 mg Trolox/g dry extract. Close to optimum performance was achieved with microwave heating in a fraction of the time (5 min) at 160 °C (extraction), yielding extracts with 231.9 mg GAE/g dry extract of total phenolics and antiradical capacity equivalent to 1176.3 mg Trolox/g dry extract. Slightly higher antioxidant values were identified for spray-dried extracts (between 5% for phenolic content and 2.5% for antioxidant capacity). The extracts obtained with both heating methods at 200 °C contained more than 20% oligosaccharides, primarily glucose. All the formulated gelling matrices enriched with the obtained extracts displayed intermediate gel strength properties. The tested technologies efficiently recovered highly active antioxidant extracts, rich in polyphenolics, and valuable for formulating gelling matrices with potential applicability in foods and other products.
format	article
author	Audrey Bianchi Pamela R. Rivera-Tovar Vanesa Sanz Tania Ferreira-Anta María Dolores Torres José Ricardo Pérez-Correa Herminia Domínguez
author_facet	Audrey Bianchi Pamela R. Rivera-Tovar Vanesa Sanz Tania Ferreira-Anta María Dolores Torres José Ricardo Pérez-Correa Herminia Domínguez
author_sort	Audrey Bianchi
title	Pressurized Hot Water Extraction and Bio-Hydrogels Formulation with <i>Aristotelia chilensis</i> [Mol.] Stuntz Leaves
title_short	Pressurized Hot Water Extraction and Bio-Hydrogels Formulation with <i>Aristotelia chilensis</i> [Mol.] Stuntz Leaves
title_full	Pressurized Hot Water Extraction and Bio-Hydrogels Formulation with <i>Aristotelia chilensis</i> [Mol.] Stuntz Leaves
title_fullStr	Pressurized Hot Water Extraction and Bio-Hydrogels Formulation with <i>Aristotelia chilensis</i> [Mol.] Stuntz Leaves
title_full_unstemmed	Pressurized Hot Water Extraction and Bio-Hydrogels Formulation with <i>Aristotelia chilensis</i> [Mol.] Stuntz Leaves
title_sort	pressurized hot water extraction and bio-hydrogels formulation with <i>aristotelia chilensis</i> [mol.] stuntz leaves
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/287a30ce788044939e9d3697a9da3901
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Pressurized Hot Water Extraction and Bio-Hydrogels Formulation with <i>Aristotelia chilensis</i> [Mol.] Stuntz Leaves

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