Repositorio
Institucional

Castro-Varela, Pablo

Rubilar, Monica

Rodrigues, Bruna

Pacheco, Maria Jesus

Caneda-Santiago, Candela T.

Mari-Beffa, Manuel

Figueroa, Felix L.

Abdala-Diaz, Roberto

A sequential recovery extraction and biological activity of water-soluble sulfated polysaccharides from the polar red macroalgae Sarcopeltis skottsbergii

ELSEVIER

ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS

en

Algal biomass is comprised of a variety of biochemical components that make it a viable raw material for use in a variety of applications using a biorefining process. From the residual supernatant generated by high-pressure homogenization for the extraction of the R-phycoerythrin pigment, two soluble polysaccharides (neutral and acid fractions) were obtained. The composition of total carbon (C), hydrogen (H), nitrogen (N), and sulfur (S), gas chromatography-mass spectrometry (GC-MS), Fourier transform infrared (FTIR-ATR) spectroscopy, anti-oxidant capacity (ABTS) and antiproliferative in vitro and in vivo activities were evaluated. The two poly-saccharides, which had a relatively high sulfate content, exhibited significant antioxidant activity in superoxide radical assay (ABTS) and high anti-proliferative effects on G-361, U-937, HCT-116 cancer cells. High selectivity index (>3) was observed for the acid extract on G-361 and U-937 cell lines, but a significant inhibitory effect on the growth of 1064sK healthy fibroblast cells was measured too. On the other hand, neutral fraction poly-saccharides, with the lowest sulfate content and relatively lower radical scavenging rates, showed scarce anti-tumor activity, a high selectivity index on G-361 melanoma cancer cells and non-toxicity on healthy cells. This differential behavior was verified by testing toxicity and lethality of both polysaccharide extracts in and in vivo zebrafish embryo acute toxicity test. Following this method, the LC50 of the neutral fraction resulted much higher (1.477 mg mL-1, p & AP, 0.0000) than that of the acid fraction (0.080 mg mL-1, p & AP, 0.0000) at 72 h post-fertilization. During this period, a slight growth delay and/or rare teratogenic effects were also induced by these fractions at concentrations lower than their LC50. Overall, this study indicates that the antitumor, anti-oxidant and toxicity effects of polysaccharides may be related to the combined effects of sulfate and galactose contents from the residual supernatant bioprocess. The nutraceutical potential of the acid fractions is thus finally discussed.

2023

artículo original

10.1016/j.algal.2023.103160

PDF

Recovery extraction

Sulfated polysaccharides

Antioxidants activity

Antitumor active

Zebrafish

Red seaweed

Biotecnología y Microbiología Aplicada

Extracción de recuperación

Polisacáridos sulfatados

Actividad antioxidante

Activo antitumoral

pez cebra

Alga roja

artículo original

versión publicada

metadata

metadata

WOS:001023798600001

2211-9264

hibrida

Biotecnología y Microbiología Aplicada