If possible, the polypeptide should be preserved at -2℃ in the form of freeze-dried powder, which will avoid the degradation of bacteria, the formation of secondary structure, oxidation or other modifications within a few years. The stability of polypeptide in solution is poor, so it is strongly recommended to use sterilized water or sterilized filtration to dissolve it. If there are residues such as Cys,Met or Trp in the sequence, dissolve it in an oxygen-free solvent to avoid oxidation. When using cold frozen solution, it is suggested that the solution should be divided into packages to avoid the damage to the polypeptide caused by repeated dissolution and freezing. The recommended range of pH is 3-6. Before use, ensure that the packaging container and its contents are warmed to room temperature to avoid water absorption. It is best to prepare the peptide solution immediately, and keep the peptide solution at a low temperature but not frozen during use. Long-term storage (3 months to 5 years): freeze-dried powder, freeze-dried at -2℃; Mid-term preservation (-3 months): freezing liquid or freeze-dried powder at -2℃; Short-term preservation (<: 1 week): refrigerated liquid or freeze-dried powder.
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