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

Authors :
José Ricardo Pérez-Correa
Herminia Domínguez
Tania Ferreira-Anta
Audrey Bianchi
María Dolores Torres
Pamela Raquel Rivera-Tovar
Vanesa Sanz
Source :
Molecules, Molecules, Vol 26, Iss 6402, p 6402 (2021), Volume 26, Issue 21, Investigo. Repositorio Institucional de la Universidade de Vigo, Universidade de Vigo (UVigo)
Publication Year :
2021
Publisher :
MDPI, 2021.

Abstract

Aristotelia chilensis 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 (w:w). 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<br />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.

Details

Language :
English
ISSN :
14203049
Volume :
26
Issue :
21
Database :
OpenAIRE
Journal :
Molecules
Accession number :
edsair.doi.dedup.....6454cf816e4bf8b34bf666372f732ab7