Antioxidant Capacity of Phenolic Acids Extracted From the Biomass From Spirulina SP.LEB-18 / Capacidade Antioxidante De Ácidos Fenólicos Extraídos Da Biomassa De Spirulina SP.LEB-18

Machado, Adriana Rodrigues; Graça, Carolina da Silva; Machado, Maria Inês Rodrigues; Souza-Soares, Leonor Almeida de

doi:10.34117/bjdv7n3-345

Cited by 4 publications

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“…The DPPH and ABTS methods simulate the presence of ROS (reactive oxygen species) through organic radicals that disappear in the presence of antioxidant compounds [ 48 ]. FRAP assesses the ability of extracts to donate an electron by reducing the ferric ion (Fe 3+ ) to the ferrous ion (Fe 2+ ) [ 54 ]. The DPPH and ABTS scavenging activity and FRAP value (µmol.L −1 ) were determined for the eight different extracts at concentrations of 1, 5 and 10 mg.mL −1 ( Figure 3 ).…”

Section: Resultsmentioning

confidence: 99%

Isolation and Identification of Lichen Photobionts Collected from Different Environments in North of Portugal and Evaluation of Bioactivities of Their Extracts

Loureiro,

Morais,

Silva

et al. 2024

Foods

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Lichens are organisms constituted by a symbiotic relationship between a fungus (mycobiont) and a photoautotrophic partner (photobiont). Lichens produce several bioactive compounds; however, the biotechnological exploitation of this organism is hampered by its slow growth. To start studying the possibility of exploiting lichens as alternative sources of bioactive compounds, eighteen lichens were collected in the north of Portugal in order to isolate and study the bioactivity of their photobionts. It was possible to isolate and cultivate only eight photobionts. Three of them, LFR1, LFA2 and LCF3, belong to the Coelastrella genus, the other two (LFA1 and LCF1) belong to the Chlorella genus and for the remaining three photobionts, LFS1, LCA1 and LCR1, it was impossible to isolate their microalgae. These only grow in consortium with bacteria and/or cyanobacteria. All extracts showed antioxidant activity, mainly at a concentration of 10 mg.mL−1. LFS1, a consortium extract, showed the highest antioxidant power, as well as the highest concentration of phenolic compounds (5.16 ± 0.53 mg of gallic acid equivalents (GAE).g−1). The extracts under study did not show significant antibacterial activity against Escherichia coli, Listeria or Salmonella. The Coelastrella sp. and LFA1 extracts showed the highest hyaluronidase inhibition. The LFR1 extract at a concentration of 5 mg.mL−1 showed the highest anti-inflammatory activity (79.77 ± 7.66%). The extracts of Coelastrella sp. and LFA1 also showed greater antidiabetic activity, demonstrating the high inhibitory power of α-amylase and α-glucosidase. LFR1 at a concentration of 5 mg.mL−1, due to its selective cytotoxicity inhibiting the growth of cancer cells (Caco-2 cells), is a promising anticancer agent.

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Section: Resultsmentioning

confidence: 99%

Isolation and Identification of Lichen Photobionts Collected from Different Environments in North of Portugal and Evaluation of Bioactivities of Their Extracts

Loureiro,

Morais,

Silva

et al. 2024

Foods

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Antioxidant potential and antiangiogenic activity of Tetraselmis suecica grown in a semicontinuous culture

Rentería-Mexía

Ulloa-Mercado

Gortáres‐Moroyoqui

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND A main advantage of microalgae cultivation is its capacity to produce metabolites of biotechnological interest through modification of growth conditions. The aim was to evaluate the effect of strontium addition (Sr) to the culture medium and culture scale‐up of Tetraselmis suecica on antioxidant capacity and antiangiogenic activity. RESULTS Antiradical activity in extracts through the DPPH (α, α‐diphenyl‐β‐picrylhydrazyl free radical) scavenging method was higher for a 5‐L reactor (81.9 ± 2.5%) than for a 80‐L reactor (60 ± 4.6%), and through the TEAC (Trolox equivalent antioxidant capacity) method, the activity measures were 1.38 ± 0.05 and 1.12 ± 0.05 mmol Trolox, respectively. Lipid peroxidation β‐carotene bleaching reached the highest activity coefficients for the 80‐L reactor (ethanol extract 724 ± 35 AAC). Antioxidant activity was similar with and without Sr, although it was affected by the scale‐up. Extractable solids were maximized in the 80‐L reactor (350 ± 6 mg g−1 for methanol–water), whereas phenolic compounds were higher for ethanol extracts (5.5 ± 0.1 mg GAE g−1 for 5‐ and 80‐L reactors, without Sr addition). The antiangiogenic activity was improved in the methanol extract by ≈50% more than the negative control. CONCLUSION The antioxidant activity of T. suecica biomass can be improved using different culture scale‐ups and solvents during extraction, increasing the production of natural sources of antioxidant and antiangiogenic compounds for their use in food, health and cosmetics. © 2022 Society of Chemical Industry (SCI).

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Spirulina Leb -18 and Chlorella Pyrenoidosa Nanoencapsulatedthrough Reversed-Phase Evaporation

Machado,

de Assis,

Machado

et al. 2024

Preprint

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Antioxidant Capacity of Phenolic Acids Extracted From the Biomass From Spirulina SP.LEB-18 / Capacidade Antioxidante De Ácidos Fenólicos Extraídos Da Biomassa De Spirulina SP.LEB-18

Cited by 4 publications

References 0 publications

Isolation and Identification of Lichen Photobionts Collected from Different Environments in North of Portugal and Evaluation of Bioactivities of Their Extracts

Isolation and Identification of Lichen Photobionts Collected from Different Environments in North of Portugal and Evaluation of Bioactivities of Their Extracts

Antioxidant potential and antiangiogenic activity of Tetraselmis suecica grown in a semicontinuous culture

Spirulina Leb -18 and Chlorella Pyrenoidosa Nanoencapsulatedthrough Reversed-Phase Evaporation

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