Abstract
The red seaweeds Grateloupia turuturu and Porphyra umbilicalis are commonly used as human food, mainly in East Asia, being valuable nutritional sources. However, studies focusing on their composition and bioactivities are scarce. Thus, G. turuturu and P. umbilicalis hydroethanolic and water (infusion and decoction) extracts were prepared to characterize their bioactive compounds; assess antioxidant activity against ABTS•+, •OH and •NO radicals and evaluate anti-proliferative and anti-inflammatory activities using mouse macrophage (RAW 264.7) cells. Folin–Ciocalteau results showed that G. turuturu and P. umbilicalis water extracts have fourfold and threefold, respectively, higher content in reducing compounds than hydroethanolic extracts, with the water decoctions on the richer ones (15.7 ± 0.3 and 11.9 ± 0.2 mg GAE g−1 dw, respectively; p < 0.05). In the same way, decoction extracts of both seaweeds showed the highest antioxidant activity, measured as ABTS•+ scavenging (49.4 ± 1.6 and 46.1 ± 1.8 mmol TE g−1 dw, for G. turuturu and P. umbilicalis, respectively; p < 0.05). Concerning •OH radical, both hydroethanolic extracts exhibited identical (p > 0.05) production inhibition capacity (~ 55%), however higher than water extracts (p < 0.05). Grateloupia turuturu water extracts produced the highest inhibition capacity against •NO production, 54–56%. RP-HPLC–DAD analysis revealed the presence of mycosporine-like amino acids (MAAs) shinorine, palythine, porphyra-334 and asterina-330 identified in both seaweeds. All extracts produced dose- and time-dependent anti-proliferative activity, being P. umbilicalis infusion extracts the most active (IC50 = 0.43 mg mL−1). At non-cytotoxic concentrations, dose-dependent anti-inflammatory activity was observed for all extracts, highlighting the P. umbilicalis hydroethanolic extract at 0.2 mg mL−1 that inhibited ~ 55% (of control) of lipopolysaccharide-induced NO release. In conclusion, G. turuturu and P. umbilicalis are rich in bioactive compounds, in particular MAAs, responsible for the bioactivities here reported, reinforcing their potential as functional food as well as sources of bioactive compounds to food and pharmaceutical industries.
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Funding
This research was supported by European Investment Funds by FEDER/COMPETE/POCI under Projects POCI-01-0145-FEDER-006958 (CITAB) and POCI-01-0145-FEDER-007728 (CQ-VR), and funds from the Fundação para a Ciência e Tecnologia (FCT), to CITAB (UIDB/04033/2020), CQ-VR (UIDB/00616/2020), CECAV (UIDB/CVT/00772/2020), CESAM (UIDB/50017/2020) and CEB (UIDB/04033/2020), through national funds. FCT is also acknowledged under the references SFRH/BD/144882/2019 to João Ferreira and SFRH/BD/145855/2019 to Carlos Martins-Gomes.
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Ferreira, J., Hartmann, A., Martins-Gomes, C. et al. Red seaweeds strengthening the nexus between nutrition and health: phytochemical characterization and bioactive properties of Grateloupia turuturu and Porphyra umbilicalis extracts. J Appl Phycol 33, 3365–3381 (2021). https://doi.org/10.1007/s10811-021-02529-6
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DOI: https://doi.org/10.1007/s10811-021-02529-6
Keywords
- Rhodophyta
- Antioxidant
- Anti-proliferative
- Anti-inflammatory
- Mycosporine-like amino acids
- Functional food