Studies On Food Functionalities Of Tea Polysaccharides (TPS)

Tea polysaccharides are extracted from coarse tea, which have many bioactivities, such as anti-radiation, decreasing blood glucose, blood pressure, blood lipids, improve the immunity of body, protecting the cardiovascular and anti-atheroma, especially its function of decreasing blood glucose was indicated by many researchers. But the studies of food functionalities of tea polysaccharides have not been reported so far. Food functionalities of TPS were studied in the paper to accelerate its application in food or healthy food.Two contents of tea polysaccharides, TPSâ… and TPSâ…¡, were prepared from Laoshan green coarse tea. TPSâ…¢was prepared through Sepharose Fast Flow and Sephadex G-100 by using TPSâ…¡, and it performed a single peak on HPLC, so it indicated that TPSâ…¢was pure tea polysaccharides. The relative molecular weight of TPSâ…¢was between 10KDa and 12KDa after determination and calculation.TPSâ…¢were used as the standard sample to determine the content of polysaccharides in TPSâ… and TPSâ…¡by the anthrone-sulfuric acid method in order to increase the veracity of determination of polysaccharides in tea. The result showed that content of polysaccharides in TPSâ… and TPSâ…¡is 27.80% and 57.60%, respectively. TPSâ… and TPSâ…¡can meet the need of food processing.Solubility, capacities of oil absorption, frothing, froth maintenance, moisture absorption, moisture retention, apparent viscosity and caloric properties of TPSâ… and TPSâ…¡were studied in the research. TPSâ… and TPSâ…¡could dissolve in water and not in high concentration of organic solvent. With the increasing of temperature, their solubility increased. Solubility of TPSâ… and TPSâ…¡was 0.1g/mL and 0.02g/mL, respectively. Salt solution had effect on the solubility of TPSâ… and TPSâ…¡. Solubility...