an increasing trendP<0.001
Within 90 sec, the fluorescence intensity was continuously declining in the TP and F + TP groups (P<0.001 and P=0.024, respectively), suggesting that Cl − could be accumulated in OCs in these groups; however, the fluorescence intensity in the F group exhibited an increasing trend (P<0.001), suggesting that OCs in the F group did not retain Cl − .