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Alternative protocols for the production of more sustainable agar-based extracts from Gelidium sesquipedale

Martínez-Sanz, Marta (author)
Institute of Agrochemistry and Food Technology, Spain
Gomez-Barrio, Laura (author)
Teagasc Food Research Centre, Ireland
Zhao, Ming (author)
Teagasc Food Research Centre, Ireland
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Tiwari, Brijesh (author)
Teagasc Food Research Centre, Ireland
Knutsen, Svein (author)
Nofima AS, Norway
Ballance, Simon (author)
Nofima AS, Norway
Zobel, Hanne (author)
Nofima AS, Norway
Ekman Nilsson, Anna (author)
RISE,Jordbruk och livsmedel
Krewer, Christoffer (author)
RISE,Jordbruk och livsmedel
Östergren, Karin (author)
RISE,Jordbruk och livsmedel
López-Rubio, Amparo (author)
Institute of Agrochemistry and Food Technology, Spain
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 (creator_code:org_t)
Elsevier B.V. 2021
2021
English.
In: Algal Research. - : Elsevier B.V.. - 2211-9264. ; 55
Related links:
https://doi.org/10.1...
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https://nofima.brage...
https://urn.kb.se/re...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • 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. 

Subject headings

LANTBRUKSVETENSKAPER  -- Lantbruksvetenskap, skogsbruk och fiske -- Livsmedelsvetenskap (hsv//swe)
AGRICULTURAL SCIENCES  -- Agriculture, Forestry and Fisheries -- Food Science (hsv//eng)

Keyword

Antioxidant capacity
Gelidium sesquipedale
Microwaves
Phycocolloids
Seaweed
Ultrasounds

Publication and Content Type

ref (subject category)
art (subject category)

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