1, chemical methods mainly include antistaling agent. Common fresh-keeping agent has at present: daub coating agent, ethylene treatment agent (absorbent), sterilization anti-corrosive antistaling agent, etc.
When used for family use less with Suggestions of preservation of chemical preservatives, most commonly used physical methods, such as low temperature storage (refrigerator), cellar, exhaust sealed (low temperature and humidity) or in the water, and often need to have a fresh cold storage of auxiliary.
2, physical methods mainly include: low temperature storage, controlled atmosphere storage, reduced pressure storage, electromagnetic radiation, storage, etc.
Among them, the more advanced technology mainly include critical low temperature and humidity preservation, intercellular structured modified atmosphere, ozone water modified atmosphere, etc., these fresh is widely used, but the need for special equipment, complicated operation, high cost, large scale use has the certain difficulty.