期刊
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
卷 34, 期 -, 页码 57-67出版社
ELSEVIER
DOI: 10.1016/j.algal.2018.07.007
关键词
Mycosporine-like amino acids; Antioxidant; Pro-oxidant; Seaweed
资金
- CNPq (National Council for Scientific and Technological Development) [140073/2013-2]
- FAPESP (Sao Paulo Research Foundation) [2013/07543-0, Biota/FAPESP 2013/50731-1]
- CEPLAC (Executive Commission of the Cocoa Farming Plan)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [13/07543-0] Funding Source: FAPESP
The most common Mycosporine-like Amino Acids (MAAs) in red algae (asterina-330, shinorine, palythine, palythinol, and porphyra-334) were evaluated regarding their in vitro antioxidant capacities, comparing them with synthetic (BHT and Trolox) and natural (ascorbic acid, gallic acid, p-cumaric acid, quercetin, and rutin) antioxidants. Folin-Ciocalteu, ABTS center dot(+), and FRAP assays have the same reaction mechanism of electron transfer and usually show a positive correlation. However, the antioxidant capacities for the MAAs were discrepant between these assays. While porphyra-334, shinorine, and palythine were as active as, or more active than synthetic phenolic antioxidants (Trolox and BHT) in Folin-Ciocalteu assay, the antioxidant potentials of MAAs were lower than those of the standard compounds in ABTS center dot(+) and FRAP assays. The pH-dependent antioxidant power was hypothesized as an explanation for this distinct behavior and was evaluated through ABTS center dot(+) assay. Alkaline pH allows antioxidant capacities similar to Trolox in ABTS center dot(+) assay, supporting our hypothesis. Comparing to standard compounds, MAAs showed low activity using ORAC assay and were pro-oxidant in beta-carotene/linoleic acid assay. Therefore, imino-MAAs present relevant in vitro antioxidant capacity under specific pH conditions in assays based on electron transfer.
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