Bacteriostatic water has gained plenty of popularity lately, mainly because of its convenience in scientific and medical settings. The compound is so popular because it has 0.9% benzyl alcohol, which acts as a gentle yet highly reliable bacteriostatic agent. This means bacteria are successfully prevented from growing and multiplying within the solution.

From this point of view, you can reuse a multi-dose vial safely for up to 28 days. To help you understand better, without bacteriostatic water, you’d have to get rid of the vial after one use. Now, what is bacteriostatic water used for and how does it work? Here’s what you need to know.

What Makes Bacteriostatic Water Unique

The 0.9% benzyl alcohol is the keyword here. This form of alcohol is a bacteriostatic preservative. It will inhibit the growth of bacteria once a vial has been opened. Normally, vials can’t be reused due to contamination risks. However, the alcohol makes it reusable.

This means that you can preserve product integrity during regular access, especially when stored and handled by the book under strict, sanitary conditions.

Compared to sterile water, bacteriostatic water allows multiple uses or applications without degrading into a breeding ground for microorganisms. Sterile water has nothing, hence its intention to be used once.

Now, it’s important to understand that bacteriostatic water won’t replace sterile techniques. In other words, you’ll still have to be careful and handle the vial as intended.

Reasons Why Bacteriostatic Water Is So Popular

Here are some of the reasons why bacteriostatic water is so popular.

·       Multiple uses. Regular sterile water is thrown away after one use. Having a preservative allows you to use it multiple times over a standard four-week period.

·       Cost. Using the same vial multiple times will also save money. From a medical point of view, it’s a great way to reduce waste.

·       Peptide dilution. Bacteriostatic water is also used to dissolve powders, such as hormones, peptides or different medications. Why? It doesn’t alter the core components at all which ensures delicate molecular chains retain their therapeutic potency and structural stability.

·       Extra shelf life. At the end of the day, the benzyl alcohol is a preservative, so it can extend the life and safety of remaining liquids for weeks without compromising purity.

How Bacteriostatic Water Works

What is bacteriostatic water and how does it work? The concept is relatively simple to understand. With 0.9% benzyl alcohol, bacteria are successfully prevented from entering and growing in the environment. Without the benzyl alcohol, bacteria would inevitably get into a vial after opening.

Sterile water has no preservatives, hence the impossibility to get the same results with it. But at the same time, it’s important to know that bacteriostatic water can’t sterilize equipment. Using it doesn’t mean that you can forget about essential laboratory practice or standard sanitation guidelines.

This means that proper handling and storage are still mandatory.

At its base, bacteriostatic water is sterile water. That’s the basis. The benzyl alcohol is added later for its beneficial action against bacterial growth.

Why Alcohol?

Adding 0.9% benzyl alcohol to sterile water and making it bacteriostatic helps with preservation. This form of alcohol is a strong preservative. It prevents bacterial growth once a vial is opened. Without it, you’d have sterile water, which isn’t as protective.

In other words, alcohol is the main preservative responsible for the benefits of bacteriostatic water.

Typical Laboratory Applications of Bacteriostatic Water

So, what is bacteriostatic water used for? Bacteriostatic water makes an excellent addition to environments where regular vial access is needed. The addition of alcohol inhibits bacterial growth.

This means that you can use it in preparing different laboratory solutions, controlled research projects, repeated vial access and general laboratory preparation and handling techniques.

Of course, different people will use bacteriostatic water for different reasons. The intended application will vary widely from one place or individual to another. The unique lab protocol will make a difference in its use, as well as the requirements of the research.

How to Store Bacteriostatic Water

Bacteriostatic water does have a series of beneficial properties, but they can all fade away if handled or stored incorrectly. Proper storage allows you to retain its integrity and beneficial uses. Here are some useful tips on storage.

• Make sure the location is clean and dry. Exposure to moisture and wet environments will expose it to even more bacteria increasing the risk of exterior vial contamination.
• Direct sunlight can also ruin some of the properties of bacteriostatic water, so keep it away from direct sunlight, ideally inside a dark cupboard or enclosed storage drawer.
• Excessive temperature is just as bad, whether it’s too cold or hot. For instance, freezing conditions are just as bad as direct sunlight during a heatwave.
• Seal it thoroughly when not in use. Bacteriostatic water comes in vials. Make sure the protective cap is well secured when not using it.
• Check the label. Most manufacturers will also offer instructions and guidance on labels. While these tips can be helpful, do take a look at the label and follow those instructions as well.

Bottom line, what is bacteriostatic water? From many points of view, it’s just sterile water with benzyl alcohol that allows multiple uses over weeks. It’s a superior form of sterile water, allowing excellent results and convenience in laboratories.​