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  5. Optimisation of Ultrasound Frequency, Extraction Time and Solvent for the Recovery of Polyphenols, Phlorotannins and Associated Antioxidant Activity from Brown Seaweeds
 
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Optimisation of Ultrasound Frequency, Extraction Time and Solvent for the Recovery of Polyphenols, Phlorotannins and Associated Antioxidant Activity from Brown Seaweeds

Author(s)
Ummat, Viruja  
Tiwari, Brijesh K.  
Jaiswal, Amit K.  
Condon, Kevin  
García-Vaquero, Marco  
O'Doherty, John V.  
O'Donnell, C. P. (Colm P.)  
Rajauria, Gaurav  
Uri
http://hdl.handle.net/10197/11956
Date Issued
2020-05-11
Date Available
2021-02-17T10:40:24Z
Abstract
This study investigates ultrasound assisted extraction (UAE) process parameters (time, frequency and solvent) to obtain high yields of phlorotannins, flavonoids, total phenolics and associated antioxidant activities from 11 brown seaweed species. Optimised UAE conditions (35 kHz, 30 min and 50% ethanol) significantly improved the extraction yield from 1.5-fold to 2.2-fold in all seaweeds investigated compared to solvent extraction. Using ultrasound, the highest recovery of total phenolics (TPC: 572.3 ± 3.2 mg gallic acid equivalent/g), total phlorotannins (TPhC: 476.3 ± 2.2 mg phloroglucinol equivalent/g) and total flavonoids (TFC: 281.0 ± 1.7 mg quercetin equivalent/g) was obtained from Fucus vesiculosus seaweed. While the lowest recovery of TPC (72.6 ± 2.9 mg GAE/g), TPhC (50.3 ± 2.0 mg PGE/g) and TFC (15.2 ± 3.3 mg QE/g) was obtained from Laminaria digitata seaweed. However, extracts from Fucus serratus obtained by UAE exhibited the strongest 1,1-diphenyl-2-picryl-hydrazyl (DPPH) scavenging activity (29.1 ± 0.25 mg trolox equivalent/g) and ferric reducing antioxidant power (FRAP) value (63.9 ± 0.74 mg trolox equivalent/g). UAE under optimised conditions was an effective, low-cost and eco-friendly technique to recover biologically active polyphenols from 11 brown seaweed species.
Sponsorship
Science Foundation Ireland
Type of Material
Journal Article
Publisher
MDPI
Journal
Marine Drugs
Volume
18
Issue
5
Copyright (Published Version)
2020 the Authors
Subjects

Ultrasound assisted e...

Conventional extract...

Polyphenols

Phlorotannin

Macroalgae

Antioxidant capacity

DOI
10.3390/md18050250
Language
English
Status of Item
Peer reviewed
ISSN
1660-3397
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by/3.0/ie/
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marinedrugs-18-00250.pdf

Size

739.45 KB

Format

Adobe PDF

Checksum (MD5)

4c0e86b1e55ee611bec14f078821b0d7

Owning collection
Agriculture and Food Science Research Collection
Mapped collections
Biosystems and Food Engineering Research Collection•
Institute of Food and Health Research Collection

Item descriptive metadata is released under a CC-0 (public domain) license: https://creativecommons.org/public-domain/cc0/.
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