Title
Studies on Properties of Cellulosic Hydrogels in Salvia Nutlets: Tiny soft treasures on earth,Used
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What a tiny treasure in Salvia nutlets produces! Topics include pericarp structure of the nutlets, chemical physicochemical properties of their hydrogels, and thermal stability of the hydrogels. Firstly nutlets of Salvia were grouped into 4 types in relation to the hydrogel productivity. Good corelationship was observed between hydrogel content and pericarp thickness. Precise chemical analysis of the hydrogels from the nutlets of three species of Salvia, S. miltiorrhiza (SM), S. sclarea (SC) and S. viridis (SV), lead to the key finding that shows presence of composite structure of cellulose and hemicellulosic polysaccharides consisting of neutral galactan or arabinogalactan and acidic (1,4)linked xylan highly substituted with glucuronic and 4Omethylglucuronic acids (SC and SV) or glucuronic acid (SM). Cooperations of electrostatic repulsion, crosslinkage through calcium ions and hydrogen bond were important for formation of the hydrogel structure. Importance of water structure and interactions between cellulose and acidic xylan was also evidenced. The summative results will provide utilization of Salvia hydrogels as future innovative biomaterials.
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