Optimization of extraction process and nitrite-scavenging ability of total flavones from Guanxiang Tea
DAI Juanxiu
TANG Guangzhi
LIANG Xiubi
LU Yuting
LI Weiqiao
GUO Lianxian
LI Linqiu
Abstract：Objective To optimize the ultrasonic-assisted extraction technology and evaluate the nitrite-scavenging ability of total flavonoids from Guanxiang Tea.Methods The paper took Guanxiang Tea into the ethanol,used response surface methodology to determine the optimal ultrasonic extraction technology for total flavonoids.At the same time,the total flavonoid content and nitrite-scavenging ability of Guanxiang Tea,fresh Guanxiang leaves and other common fermented teas were compared.Results The results showed that the optimal extraction conditions predicted by the response surface experiment were:ethanol concentration of 61.98%,ultrasonic temperature of 57.92 °C,ultrasonic time of 3.47 h,the predicted extraction rate of 2.76%,which was in agreement with the measured value of 2.74%.Under the optimal extraction conditions,the extraction rates of total flavonoids from three brands of Guanxiang Tea and fresh Guanxiang leaves were 2.48%,2.69%,2.79%,and 2.54%.The removal efficiency of total flavonoids in different tea from high to low was as follows:Guanxiang tea NO.3(72.85%),Guanxiang tea NO.2(71.06%),Oolong tea NO.1(70.93%),fresh Guanxiang leaves(70.35%),Oolong tea NO.2(Dahongpo)(69.39%),black tea NO.2(69.38%),Puer tea(68.87%),Guanxiang tea NO.1(67.14%)and black tea NO.1(40.38%).Conclusion At ethanol concentration of 61.98%,ultrasonic temperature of 57.92℃and ultrasonic time of 3.47 h,the extraction efficiency of total flavonoids was good,and the removal of nitrite was good.
Keywords：Guanxiang Teatotal flavonoidsresponse surface methodologyextraction process optimizationnitrite removal rate
Publication Date：2025-02-27
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 67-73 )