Propolis was dissolved in alkalescent condition and filtered. The filtrate was acidified and extracted after a degrease step. The purified sample was finally determined by back-titration.
采用弱碱溶解蜂胶再酸化萃取的方法纯化样品，用返滴法测定，以水杨酸作为对照品检测样品中游离酸含量。
2
It includes direct titration, backtitration, selective titration, replaceable titration, indirect titration, REDOX titration and others.
直接滴定法和返滴定法、选择性滴定法、置换滴定法、间接滴定法和氧化还原滴定法，其它滴定法。
3
The activity of catalase in hemolysates of erythrocytes and myocardial homogenate in rats was measured by backtitration method with permanganate, using perborate as the substrate.