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Brief Guidelines for Freezing and Thawing Protein Samples

Disclaimer: These guidelines are intended for use in general with protein solutions, but the stability of individual proteins varies widely. The investigator must determine the proper storage and freeze-thaw conditions for each protein.

For proteins purchased from PBL InterferonSource, refer first to the data sheet . In the absence of written guidance, contact technical service (at 1 877-PBL-8881 or + 1 732-777-9123 for recommendations on handling of specific proteins.

It is usually best to work with protein solutions on wet ice. The low temperature will slow inactivation of the protein.

Never vigorously agitate a protein sample. The preferred method of mixing protein solutions is to gently mix with a micropipettor using a polypropylene tip. (Do not use larger pipettors with polystyrene pipettes.)

An alternative for larger solutions is gentle inversion in a 15 to 50 ml capped polypropylene tube.

For volumes over 50 ml, mixing using a stir bar is acceptable, but not too vigorously. Never introduce foam or air bubbles ?these denature proteins.

Do not use glass or polystyrene containers or pipettes for antibodies or interferons unless these proteins are diluted in serum or albumin-containing media.

Freeze/Thaw of proteins. Usually a quick freeze and a quick thaw are the best methods for retaining protein activities. Rapid freezing and thawing prevent phase partitioning of the salts or protein. If a protein solution is found to be cloudy upon thawing, the bioactivities of the protein are likely to have been adversely affected.

Freezing method
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  • ¸½¼þ 1 : General Protein Handling Guideline Ö®¶³ÈÚµ°°×µÄ»ù±¾²ßÂÔ.pdf
  • 2011-12-05 11:38:53, 52.67 K

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