Journal
MOLECULES
Volume 26, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/molecules26144287
Keywords
Fucus spiralis; antioxidant activity; polyphenols; phlorotannins
Funding
- FCT (Fundacao para a Ciencia e a Tecnologia) [UID/MAR/04292/2020]
- Integrated Programme of SRTD SmartBioR [Centro-01-0145-FEDER-000018]
- Applied Molecular Biosciences Unit-UCIBIO - FCT [UIDP/04378/2020, UIDB/04378/2020]
- FCT-Fundacao para a Ciencia e Tecnologia [ROTEIRO/0031/2013 - PINFRA/22161/2016]
- FEDER through COMPETE 2020
- POCI
- PORL
- FCT through PIDDAC
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The study revealed that the polyphenol content and antioxidant power of F. spiralis extracts are influenced by the time of harvest and the solvents used for extraction. Summer extracts showed the highest polyphenol content and strongest antioxidant capacity.
Fucus spiralis that was collected in the four seasons was submitted to an extraction with ethanol:water (crude extracts Et80), followed by a liquid-liquid fractionation with organic solvents (fraction He from n-hexane; aqueous fractions AQ1, AQ2, AQ3 and AQ4; ethyl acetate fraction EA), with the aim of obtaining phlorotannin-enriched extracts. All the extracts (Et80, He, AQ1, AQ2, AQ3, AQ4 and EA) that were obtained for the F. spiralis of the four seasons were evaluated for their antioxidant capacity and total phenolic compounds. The summer extracts presented the highest contents in polyphenols (TPC), as well as the highest ferric reducing antioxidant power (FRAP), when compared to the samples from the other seasons. The reductive percentage of the DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate) compound was similar between the seasons. For all the seasons, the EA extract showed the highest polyphenol content (TPC), and the highest antioxidant capacity (highest ferric reducing power (FRAP) and lowest concentration needed to reduce 50% of the DPPH compound), which is in agreement with a phlorotannin-enriched fraction. This study revealed that the polyphenol content and antioxidant power of the F. spiralis extracts are influenced by the time of harvest, as well as by the solvents used for their extraction.
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