Heat treatment to eliminate or microorganism degradation, such as boiling
Chemical เพื่อให้เกิด reactions with oxygen, such as the use of sulfur dioxide
.Inhibition toxicity, such as smoked using carbon dioxide, vinegar, alcohol, etc.
removing water from foods such as dried
inhibition of plaque, nutrient absorption Such as welding, pickling
.Food storage in low temperature, such as freezing, freezing up.
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