nutrient source for microbial growth

1 , before adding preservatives should ensure food sterilization completely , there should be a large number of biological existence , or preservatives added will not play the desired results. Such as potassium sorbate, not only does not play a role in anti-corrosion , it will become a source of nutrition for microbial growth .
2 , 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 , because of its toxic and in some Lactic acid  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 , acidic preservatives 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 , lactic acid powder  sorbic acid potassium, sodium benzoate ; while the ester type preservatives parabens , but can also be used between the pH4 ─ 8 , and the effect is also good. 4 , should be aware of all kinds of preservatives can inhibit the microbial species , some have the effect of preservatives on the mold , and some have an effect on the yeast , preservatives only master this feature , you can remedy , generally have complex forms preservation of the more comprehensive , such as corrosion Wang Jianying and mildew preservation agent products. 5 , according to the different types of food processing technology , should take into account the price of preservatives and solubility , as well as whether it will affect the flavor of food and other factors, consolidated its advantages and disadvantages , and then add flexibility to use .