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Polysaccharides from Thymus vulgaris leaf: Structural features, antioxidant activity and interaction with bovine serum albumin.
International Journal of Biological Macromolecules 2018 November 30
Thymus vulgaris is used for various health benefits and culinary, nevertheless, report on its macromolecules is absent. Here, we report chemical compositions of the polysaccharides isolated from its leaf by sequential extraction with inorganic solvents. In particular, chemical profile of a unique rhamnogalacturonan I type polysaccharide containing ester linked phenolic acids has been described. Sugar compositional, TLC, UV-spectrometric and ESI-MS analyses of oligosaccharides generated from this polysaccharide by enzyme digestion, controlled acid hydrolysis and Smith degradation revealed atypical fine structural details. Biochemical analysis demonstrated dose-dependent antioxidant activity. A combination of large neutral side chains of the ramified region and ester linked phenolic acids are regarded as the functional sites. Ultraviolet spectrometric and fluorimetric analyses showed that this polysaccharide forms a homogeneous water-soluble complex with bovine serum albumin (binding constant, K = 2.91 × 106 /M). Consequently, water extraction affords a polysaccharide which induces pharmacological effect; this underlines the impact of thyme as natural dietetic antioxidant.
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