echoroom67

I agree with the bacteriostatic water for fridge storage. However, for freezing, I have heard that repeated freeze thaw cycles can be detrimental. It is better to aliquot into smaller vials if you plan on freezing and only thawing what you need.

coldmind64

The pH of the solution is super important. Some peptides degrade rapidly in acidic or basic conditions. Always check the optimal pH range for your specific compound if you are looking for maximum stability.

ligandden

From my experience, bacteriostatic water is generally the gold standard for most research peptides stored refrigerated. The benzyl alcohol helps prevent bacterial growth, which is a major factor in degradation. Freezing is even better for very long term.

salthands

While bacteriostatic water is good, some peptides are sensitive to benzyl alcohol. For those, sterile water for injection, possibly with a small amount of mannitol as a cryoprotectant if freezing, might be a better option. You really need to know your specific peptide's properties.

vialfiles38

That is a great point about benzyl alcohol sensitivity. I had not considered that for all peptides. Do you have any resources or general guidelines on which peptides might be more susceptible to benzyl alcohol degradation?

compoundhands26

I always use bacteriostatic water and freeze. Never had an issue with degradation over a year or more. The key is to avoid light exposure and temperature fluctuations.

amberrat

I have seen some research suggesting that certain buffer solutions, like phosphate buffered saline at a specific pH, can offer superior stability for some very sensitive peptides compared to just water. It is more complex to prepare but might be worth it for critical research.

clinicalhead

I have actually run some basic HPLC analysis on peptides stored in bacteriostatic water versus sterile water over 6 months at 4 degrees C. The ones in bacteriostatic water showed significantly less degradation. For research, that difference can be crucial.

molarstack35

I would be cautious with complex buffers unless absolutely necessary. Simpler is often better for research consistency. Bacteriostatic water and proper freezing protocols have served me well for years.