Bacteriostatic Water · Purity & Testing
Purity & Testing
Purity is central to reproducible research: an impure or mis-identified material produces unreliable data. This reference explains what the purity figure for Bacteriostatic Water (USP grade; benzyl alcohol 0.9% (9 mg/mL)) means, how it is measured, and why third-party verification matters. It concerns analytical quality for laboratory work, not suitability for any human or animal use. For research use only. Not for human consumption, diagnostic, or therapeutic use.
What the purity figure means
Bacteriostatic Water is documented at USP grade; benzyl alcohol 0.9% (9 mg/mL). A purity percentage states the proportion of the sample that is the target compound versus related impurities, as resolved by the stated analytical method. A higher, verified figure means fewer confounding species in an experiment.
Purity is only meaningful alongside the method that measured it. That is why the verification methods are stated explicitly.
- Documented purity
- USP grade; benzyl alcohol 0.9% (9 mg/mL)
- Identity method
- Mass spectrometry (LC-MS)
- Purity method
- HPLC
- Testing
- Third-party tested; COA available
How purity is measured
High-performance liquid chromatography (HPLC) separates a sample into its components so the target can be quantified against impurities; this comparison yields the purity percentage. Liquid chromatography–mass spectrometry (LC-MS) confirms the compound's identity by its mass.
Together, HPLC and LC-MS answer the two core questions: is this the right molecule, and how pure is it?
Why third-party testing matters
Independent testing removes the conflict of interest in a supplier grading its own material. Blueprint Labs' research compounds are third-party tested, with a certificate of analysis available for the batch (see the sourcing & COA reference for what that document contains).
For research, this traceability is what makes results defensible and repeatable. For research use only. Not for human consumption, diagnostic, or therapeutic use.
Available from Blueprint Labs
Bacteriostatic Water - 10ml
Third-party tested, Bacteriostatic Water supplied as a research material with a certificate of analysis available.
Questions, answered
How pure is Bacteriostatic Water?
Bacteriostatic Water is documented at USP grade; benzyl alcohol 0.9% (9 mg/mL), verified by HPLC and LC-MS.
How is the purity of Bacteriostatic Water verified?
HPLC quantifies purity by separating the sample; LC-MS confirms identity by mass. Both are reflected on the certificate of analysis.
Is Bacteriostatic Water third-party tested?
Yes. Blueprint Labs' materials are third-party tested with a certificate of analysis available for the batch.
Does high purity mean it is safe for people?
No. Purity is an analytical-quality figure for research materials and says nothing about human or animal safety. For research use only. Not for human consumption, diagnostic, or therapeutic use.