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Alternative protocols for the production of more sustainable agar-based extracts from Gelidium sesquipedale
Institute of Agrochemistry and Food Technology, Spain.
Teagasc Food Research Centre, Ireland.
Teagasc Food Research Centre, Ireland.
Teagasc Food Research Centre, Ireland.
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2021 (English)In: Algal Research, ISSN 2211-9264, Vol. 55, article id 102254Article in journal (Refereed) Published
Abstract [en]

Agar-based extracts from Gelidium sesquipedale were obtained by applying a conventional hot water treatment and alternative ultrasound- and microwave-assisted methods, with and without the application of an alkaline pre-treatment. The alkaline pre-treatment produced refined extracts with higher purity; however, extraction yields increased from 2–5% to 7–19% by omitting this step. In particular, the ultrasound-assisted extraction allowed reducing 4-fold the extraction time, while keeping constant or even increasing the yield (up to 19% for the 1 h extraction) with respect to the conventional protocol. Interestingly, the presence of proteins and polyphenols conferred the semi-refined extracts a relatively high antioxidant capacity (19–24 μmol TE/g extract). The refined extract produced by the standard protocol formed the strongest hydrogels (>1000 g/cm2). On the other hand, the semi-refined extracts produced by the alternative protocols formed slightly stronger hydrogels (337–438 g/cm2) than the refined counterparts (224–311 g/cm2), due to their greater molecular weights of the former ones. LCA assessment showed lower global warming potential for the semi-refined extracts, especially the ultrasound-assisted extraction, hence highlighting the potential of this method to produce more sustainable agar-based extracts for food-related applications. 

Place, publisher, year, edition, pages
Elsevier B.V. , 2021. Vol. 55, article id 102254
Keywords [en]
Antioxidant capacity, Gelidium sesquipedale, Microwaves, Phycocolloids, Seaweed, Ultrasounds
National Category
Food Science
Identifiers
URN: urn:nbn:se:ri:diva-52602DOI: 10.1016/j.algal.2021.102254Scopus ID: 2-s2.0-85102000953OAI: oai:DiVA.org:ri-52602DiVA, id: diva2:1538519
Note

Funding details: Horizon 2020; Funding details: Agencia Estatal de Investigación, AEI, PCI2018-092886; Funding text 1: This work was financially supported by the ?Agencia Estatal de Investigaci?n? (PCI2018-092886 Grant) and co-funded by the European Union's Horizon 2020 research and innovation programme (ERA-Net SUSFOOD2). No conflicts, informed consent, or human or animal rights are applicable to this study. Marta Mart?nez-Sanz: Conception and design, Analysis and interpretation of the data, Drafting of the article, Critical revision of the article for important intellectual content, Final approval of the article, Collection and assembly of data. Laura Pilar Gomez-Barrio: Analysis and interpretation of the data, Drafting of the article, Critical revision of the article for important intellectual content, Final approval of the article, Collection and assembly of data. Ming Zhao: Analysis and interpretation of the data, Final approval of the article, Collection and assembly of data. Brijesh Tiwari: Conception and design, Critical revision of the article for important intellectual content, Final approval of the article, Obtaining of funding. Svein Halvor Knutsen: Conception and design, Analysis and interpretation of the data, Critical revision of the article for important intellectual content, Final approval of the article, Obtaining of funding, Collection and assembly of data. Simon Ballance: Conception and design, Analysis and interpretation of the data, Critical revision of the article for important intellectual content, Final approval of the article, Obtaining of funding, Collection and assembly of data. Hanne Kristine Zobel: Analysis and interpretation of the data, Final approval of the article, Collection and assembly of data. Anna Ekman Nilsson: Analysis and interpretation of the data, Critical revision of the article for important intellectual content, Final approval of the article, Obtaining of funding, Collection and assembly of data. Christoffer Krewer: Analysis and interpretation of the data, Final approval of the article, Collection and assembly of data. Karin ?stergren: Analysis and interpretation of the data, Final approval of the article, Collection and assembly of data. Amparo L?pez-Rubio: Conception and design, Analysis and interpretation of the data, Critical revision of the article for important intellectual content, Final approval of the article, Obtaining of funding.

Available from: 2021-03-19 Created: 2021-03-19 Last updated: 2023-05-23Bibliographically approved

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