Bacteriostatic Water pH Question

[vale113]

There's plenty of discussion around bacteriostatic water, yet I haven't come across any pH reference values.

I picked up bac water that has a pH of 5.7; would that work for the majority of peptides, or might it lead to issues with certain ones?

 

[Torque]

Hospira normally sits at 5.7, range 4.5-7.0. A pH of 5.7 is a good place to be.

 

[vale113]

Torque said:

Hospira normally sits at 5.7, range 4.5-7.0. A pH of 5.7 is a good place to be.

Alright, I'll grab pH strips to verify it myself. Getting Hospira is a bit of a hassle where I am, though.

 

[Zelmar702]

https://labeling.pfizer.com/ShowLabeling.aspx?id=4666


A brief point regarding test strips: bear in mind that strips differ from one another. Certain types are made for particular liquids, and a lot of ordinary water-testing strips fail to include the exact pH ranges that bacteriostatic water needs.

In selecting strips, aim for items supplied in a sealed container that span roughly 4.0 to 9.0, ideally in 0.5 pH steps. Keep in mind that 4.5–7.0 is the safe range. Should the pH fall beneath that, the solution is turning acidic; at the 4.0 mark it is regarded as unsafe, and the preservative is probably losing strength. Conversely, when the pH climbs to 7.0 or above, that usually points to contamination from the container.

 

[vale113]

Zelmar702 said:


https://labeling.pfizer.com/ShowLabeling.aspx?id=4666


A brief point regarding test strips: bear in mind that strips differ from one another. Certain types are made for particular liquids, and a lot of ordinary water-testing strips fail to include the exact pH ranges that bacteriostatic water needs.

In selecting strips, aim for items supplied in a sealed container that span roughly 4.0 to 9.0, ideally in 0.5 pH steps. Keep in mind that 4.5–7.0 is the safe range. Should the pH fall beneath that, the solution is turning acidic; at the 4.0 mark it is regarded as unsafe, and the preservative is probably losing strength. Conversely, when the pH climbs to 7.0 or above, that usually points to contamination from the container.

So from what I gather, a gel-like consistency in the peptides means the pH has risen too much?

 

[CNCCurrency]

vale113 said:

Torque said:

Hospira normally sits at 5.7, range 4.5-7.0. A pH of 5.7 is a good place to be.

Alright, I'll grab pH strips to verify it myself. Getting Hospira is a bit of a hassle where I am, though.

For the majority of these peptides, a pH range of 4.5-7.2 is fine. When it comes to Cagri, the pH level varies widely.

 

[eidos]

A physiological pH tends to work better in the majority of situations. Roughly 7.3-7.4, like what you see in kwikpen, for instance. The exception is some peptides that are more difficult to dissolve or that turn into a gel at particular pH values. Forum threads contain the best practices.

AI can also be used to verify the isoelectric point: request references so you don't get hallucinations. The Tirz, Reta, and Sema patents include both the isoelectric point reference and the target pH. Take Reta, whose PI is estimated at under 5, meaning a higher pH is preferable; approximately 6 is acceptable.