| Title | Red seaweed biorefinery: The influence of sequential extractions on the functional properties of extracted agars and porphyrans |
|---|---|
| ID_Doc | 17343 |
| Authors | Gomes-Dias, JS; Teixeira-Guedes, CI; Teixeira, JA; Rocha, CMR |
| Title | Red seaweed biorefinery: The influence of sequential extractions on the functional properties of extracted agars and porphyrans |
| Year | 2024 |
| Published | |
| Abstract | Red seaweeds are exploited for their hydrocolloids, but other fractions are usually overlooked. In a novel approach, this study aimed to evaluate cold-water (CWE), ethanolic (EE), and alkaline (SE) extractions, alone and in sequence, to simultaneously: i) decrease the hydrocolloid extraction waste (valorizing bioactive side-streams and/or increasing extraction yield); and ii) increase the hydrocolloids' texturizing properties. It is the first time these extractions' synergetic and/or antagonistic effects will be accessed. For Porphyra dioica, a com-bination of CWE and EE was optimal: a positive influence on the melting temperature (increasing 5 degrees C to 74 degrees C) and sulphate content (a 3-fold reduction to 5 %) was observed, compared to a direct porphyran extraction. The same was observed for Gracilaria vermiculophyla, recovering two additional bioactive fractions without impacting the hydrocolloid's extraction (agar with 220 g/cm2 gelling strength and 14 % yield was obtained). The sequential use of CWE, EE, and SE was the most beneficial in Gelidium corneum processing: it enhanced agar's texturizing capacity (reaching 1150 g/cm2, a 1.5-fold increase when compared to a direct extraction), without affecting its 22 % yield or over 88 % purity. Ultimately, these findings clarified the effects of cascading biorefinery approaches from red seaweeds and their pertinence. |
| https://doi.org/10.1016/j.ijbiomac.2023.128479 |
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