2021
Martínez-Sanz, Marta; Gomez-Barrio, Laura Pilar; Zhao, Ming; Tiwari, Brijesh; Knutsen, Svein Halvor; Ballance, Simon; Zobel, Hanne Kristine; Nilsson, Anna Ekman; Krewer, Christoffer; Östergren, Karin; López-Rubio, Amparo
Alternative protocols for the production of more sustainable agar-based extracts from Gelidium sesquipedale Artículo de revista
En: Algal Research, vol. 55, pp. 102254, 2021, ISSN: 2211-9264.
Resumen | Enlaces | BibTeX | Etiquetas: Antioxidant capacity, Microwaves, Phycocolloids, Seaweed, Ultrasounds
@article{MARTINEZSANZ2021102254,
title = {Alternative protocols for the production of more sustainable agar-based extracts from Gelidium sesquipedale},
author = {Marta Martínez-Sanz and Laura Pilar Gomez-Barrio and Ming Zhao and Brijesh Tiwari and Svein Halvor Knutsen and Simon Ballance and Hanne Kristine Zobel and Anna Ekman Nilsson and Christoffer Krewer and Karin Östergren and Amparo López-Rubio},
url = {https://www.sciencedirect.com/science/article/pii/S2211926421000734},
doi = {https://doi.org/10.1016/j.algal.2021.102254},
issn = {2211-9264},
year = {2021},
date = {2021-01-01},
journal = {Algal Research},
volume = {55},
pages = {102254},
abstract = {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.},
keywords = {Antioxidant capacity, Microwaves, Phycocolloids, Seaweed, Ultrasounds},
pubstate = {published},
tppubtype = {article}
}
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.
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