Taking Penicillium sp. of Kiwi Fruit as experimental subjects, the bacteriostasis of chlorine dioxide gas on both Penicillium sp. and the leakage of main cellular content of kiwi fruit are studied. The results shows that chlorine dioxide gas could both inhibit the germination of Penicillium sp. spores and the growth of mycelium. The germination of Penicillium sp. spores were completely inhibited when the kiwi fruit was treated with chlorine dioxide gas about 0.8 mg/L for 7 minutes and about 0.6 mg/L for 10 minutes. And a 25-minute treatment of chlorine dioxide gas under the concentration of 2.8 mg/L might exterminate the growth of mycelium. Chlorine dioxide gas damaged the barrier function and the membrane permeability of Penicillium sp. cells. No matter how long the time of treatment of Penicillium sp. toward kiwi fruit would be, there is always a strong correlation between the leakage of protein, DNA and the inhibition rate of Penicillium sp., which may be the important reason of inhibiting Penicillium sp. Meanwhile, there are minor effects of chlorine dioxide gas on the leakage of magnesium ions and calcium ions.

Penicillium sp.; chlorine dioxide gas; kiwi fruit; antibacterial mechanism