[Determination of catechin by three wavelength spectrophotometry and the antioxidation effect in natural teas and their beverages].
OBJECTIVE
To determine the catechin and the antioxidation effect in natural tea and their beverages.


METHODS
Three wavelength spectrophotometry can eliminate the absorbance error of interfering components, turbid solution and the scattering effect. Background changedwith concentration changed and asymmetric absorption peak problems can be solved, and the antioxidation effect of natural tea and their beverages was studied by the flow-injection chemiluminescence.


RESULTS
The recovery is 95.2%-102.0% and the coefficient of variation is 1.05%. Conclusion The results have shown that natural tea and their beverages are abundant in the catechin compounds and strong antioxidative effect.
Hui
Rui-hua
RH
Department of Chemistry, Anshan Normal University, Anshan 114005, China.
Hou
Dong-yan
DY
Liu
Xiao-yuan
XY
Tang
Rui
R
D000975:Antioxidants / Q000032:analysis* / Q000302:isolation & purification; D002392:Catechin / Q000032:analysis* / Q000302:isolation & purification; D013053:Spectrophotometry / Q000379:methods*; D013662:Tea / Q000737:chemistry*
D000975:Antioxidants; D013662:Tea; D002392:Catechin