Effect of tea infusions on inhibition of nitrosifi cation
Various tea infusions were used as the test samples, the scavenging rate of nitrite and interdiction rate of nitrosylation were measured under simulate gastric juice in vitro. The results showed that the scavenging rate of nitrite was significant positive correlation with the concentration of tea polyphenols. Green tea, black tea, oolong tea, pu'er tea had some effect on scavenging nitrite, the average scavenging rates were 75.90%, 37.25%, 64.29% and 70.45%. Under the condition of pH3.0 and 37 ℃, green tea had higher interdiction rate of nitrosamine, at 54.20%; Black tea, oolong tea, pu'er tea also had certain effect on inhibition of nitrosifi cation, the average interdiction rate were 44.16%, 51.23% and 53.00%, respectively. The order of scavenging rates and interdiction rate were: green teapu'er teaoolong teablack tea. But the scavenging rate of nitrite and interdiction rate existed differences of all kinds of tea infusions.