Polysaccharides of red alga Gracilaria intermedia: structure, antioxidant activity and rheological behavior
| Autor: | Pedro Hermano Menezes de Vasconcelos, Luís Eduardo Castanheira Costa, Thiago dos Santos Francisco, Gustavo R.C. Santos, Renata Moschini Daudt, Joana Paula Lima de Castro, Lizandra Mistrello Funari, Ana Lúcia Ponte Freitas, Nilo Sérgio Medeiros Cardozo, Maísa Pessoa Pinheiro |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Antioxidant
DPPH medicine.medical_treatment rheological behavior polysaccharides 02 engineering and technology lcsh:Chemical technology Polysaccharide 01 natural sciences Colorimetry (chemical method) chemistry.chemical_compound antioxidant activities medicine Chemical Engineering (miscellaneous) lcsh:TP1-1185 Chelation structure Fourier transform infrared spectroscopy Algas vermelhas chemistry.chemical_classification Chromatography 010405 organic chemistry Chemistry Organic Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Polissacarídeos Gas chromatography Turbidimetry 0210 nano-technology Gracilaria intermedia |
| Zdroj: | Polímeros v.28 n.2 2018 Polímeros (São Carlos. Online) Associação Brasileira de Polímeros (ABPol) instacron:ABPO Repositório Institucional da UFRGS Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS Polímeros, Volume: 28, Issue: 2, Pages: 178-186, Published: 21 MAY 2018 Polímeros, Iss 0 (2018) |
| Popis: | A sulfated polysaccharide fraction from the red alga Gracilaria intermedia (PLS) was obtained by papain digestion (60 °C, 30 min). The extract was subjected to colorimetry and turbidimetry analysis, Fourier transform infrared (FTIR) spectroscopy, 1H, 13 C and 2D 1H COSY nuclear magnetic resonance (NMR) and gas chromatography/mass spectrometry analysis. Antioxidant activity tests were performed (chelation of ferrous ion, total antioxidant capacity, and scavenging of DPPH radicals); significant activity of the extract indicated that these polysaccharides may be used as non-synthetic antioxidants. The rheological behavior of aqueous polysaccharide solutions was studied at 25 ± 1 °C using steady-shear and dynamic oscillatory measurements. All the solutions analyzed showed pseudoplastic behavior and potential to act as a thickening agent, as proved through a preliminary comparison with a commercial product used for this application. |
| Databáze: | OpenAIRE |
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