Studing Of Producing Tannin And Ellagic Acid From Tara

Tannin have been associated with anti-cancer, anti-virus,complexation with metal ions activities. It can be used as leather tanningagents, pharmaceutical, food preservatives, stabilizer, liquor filtrationadsorption agent, but also an important raw material for chemical industry.Ellagic acid is a kind of natural polyphenolic compound, which have beenassociated with anticancer, antiviral, antioxidant effect. In recent years,ellagic acid has been used in food, medicine, cosmetics more and morewidely. We are looking for a new plant Tara which is instead of traditionalmedicine gallnut, researching a new technique to get tara tannic acid andellagic acid. The main research contents and results are as follows:1.Analysis the effect of different methods, extraction reagents andextraction times on tara tanning yield and purity. The optimum methodwas selected with a reflux method and choice of80%methanol solutionas solvent, resulting in73%of purity and96%of extraction rate.2. The purification method of tara tannin was optimized by threekinds of methods: freezing clarification, solvent extraction, macroporous resin adsorption. Freezing method can improve the purity of3%. Ethylacetate extraction improve the products purity from70%to more than79%, in line with the state industrial tannic acid standard. Macroporousadsorption resin has good physical adsorption capacity, adsorptionselectivity, wide applicable range and performance stable on oxygen, heat,organic solvent, is easy to be regenerated. We used HP2MG resin topurificate tannin, the purity of the product can be increased by15~20%,up to85%. The recovery rate is93%.3.In studies of oxidation reaction of tara tannin, the optimal processconditions was determined as follow: water was17times of tannin,0.375mol/L of NaOH,0.4mol/L of NaHCO3,24hours of reaction time. Inthis process, the purity of ellagic acid was40%.4. The aqueous solubility of ellagic acid was changed by pH. Usingthis character, the method for purification of ellagic acid has beendevelop. This study investigated the effect of EA Concentration, NaOHSolution Concentration, pH, HCL Concentration and washing times.Ellagic acid was yellow and it’s purity reached95%.5.Technics of ellagic acid manufactured by tannin in Laboratory wasmagnified to achieve industrialization.