Abstract:

Treated the green tea infusion with Ca2+, Mg2+, Al3+ and their mixture solution, found out the influence of metal ions. The results showed that, Ca2+ had significant influence on turbidity, and the mixture solution had cumulative effect. When treated with metal ions and their mixture solution, the conductivity increased, pH and the content of polyphenol and caffeine decreased. The total content of catechin, GC, EGC, C, EC, EGCG, ECG and CG decreased, while GCG and amino acids increased. The sensory of the green tea declined, aroma became softer and taste became bitter. In all the treatments, tap water had the greatest influence on the sensory and quality.