Microbial propagation source of nutrition

Should be aware of the toxicity of various preservatives and scope , in accordance with the safe use of volume and scope to add it. Such as sodium benzoate , Zinc lactate its toxic and in some countries has been disabled , and the Chinese are strictly uncertain only in its sauce , jams , pickles , canned and some alcohol use . 3 , should be aware of the effective use of various preservatives environment , lactic acid powder used only in a strong acidic environment of an effective anti-corrosion effect, but is used in a neutral or alkaline environment but not much effect , such as sorbic acid potassium, sodium benzoate ;