STUDY ON STRUCTURE AND PROPERTIES OF POLYSACCHARIDE EXTRACTED FROM ALGAE WHICH INHABIT RICE PADDIES IN PHU THO PROVINCE

Abstract

    Polysaccharide was extracted from algae which inhabit rice paddies in Phu Tho province(PS-PT) using NaOH extraction and isopropanol precipitation. The yield was calculated at 52wt% of dry algae. The chemical structure of PS-PT was confirmed by FT-IR measurement thatit had carboxyl and sulfate groups, as well as the typical functional groups of sugar. Inaddition, zeta-potential of PS-PT showed the anionic sugar. PS-PT was constituted frommonosaccharide such as rhamnose, glucose, galatose, xylose, mannose, fucose, arabinose,ribose, which were confirmed by GC-MS measurement. GPC measurement in water indicatedthat PS-PT had an ultra-high molecular weight and narrow polydispersity. Furthermore, PSPTshowed high viscosity and thermal stability.

Keywords: algae, polysaccharide, anionic sugar, ultra-high molecular weight, high viscosity,high thermal stability