In order to study the anti-viral mechanism of extracted ZG from Gardenia,the effect of extracted ZG on Hep-2 cell membrane potential,Na+-K+-ATPase activity and membrane fluidity post infected with parainfluenza virus type 1(PIV-1)was observed.Acetylcholine which was fluorescent labeled with DiBAC4(3)was taken as positive control to observe the changes of membrane potential and was measured by flow cytometer.The phosphorus determination method and spectrophotometer were used to measure the Na+-K+-ATPase acti...