Study on Stability of Polyphenols Extracting Solution in Guava Leaves
Guava leaf extraction has many medicinal effects such antioxidant activity ,antibacterial function, al-leviating spasm, curing cough, and reducing blood sugar, and the main components were the aromatic metabo-lites in second phrase which were polyphenols. In this study , attention was paid on the stability of guava leaves polyphenols extracting solution. It had good stability when under weak acid condition and in a cool and dark place. Sucrose had no effects on stability but high concentration of glucose and sodium benzoate had;salts had obvious effect on stability;citric acid had hyper chromic effect on the polyphenols;potassium sorbate led to un-stable result;it was stabled with Mg2+and instability with Zn2+,Fe2+and Fe3+, for K+and Ca2+, stabled in low con-centration, instabled in high concentration.