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    "title": "Bacteriostatic Water for Peptides Explained for the Bench",
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            "value": "Bacteriostatic water is sterile water with benzyl alcohol added as a preservative, sold in multiple-dose vials; sterile water has no preservative and comes",
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            "value": "What is bacteriostatic water?",
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            "value": "Bacteriostatic water vs sterile water: what is the difference?",
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            "value": "What is benzyl alcohol and why is a preservative added?",
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            "value": "Can a preservative affect the protein you are dissolving?",
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            "value": "What are the common mistakes with bacteriostatic water?",
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            "value": "Where does bacteriostatic water 30 ml fit in a research workflow?",
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            "value": "Related reading",
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            "q": "What is bacteriostatic water?",
            "a": "It is a sterile preparation of water for injection with benzyl alcohol added as a bacteriostatic preservative. One Hospira label describes it as supplied in a multiple-dose container for repeated withdrawals when diluting or dissolving drugs."
        },
        {
            "q": "What is the difference between bacteriostatic water and sterile water?",
            "a": "Bacteriostatic water contains benzyl alcohol and comes in a multiple-dose container. A Cardinal Health sterile water label says its product has no bacteriostat or antimicrobial agent and is supplied only in single-dose containers."
        },
        {
            "q": "What preservative is in bacteriostatic water?",
            "a": "Benzyl alcohol. The Hospira label lists 0.9% (9 mg/mL) or 1.1% (11 mg/mL). Our 30 ml Pfizer Hospira USP vial is recorded at 0.9% benzyl alcohol."
        },
        {
            "q": "Why does bacteriostatic water come in a multiple-dose vial?",
            "a": "The preservative is added so repeated withdrawals can be made from one container. The Hospira label says the multiple-dose container is designed for repeated withdrawals to dilute or dissolve drugs."
        },
        {
            "q": "Is the Hospira bacteriostatic water label the same as sterile water for injection?",
            "a": "No. The Hospira label lists benzyl alcohol and a multiple-dose container. The Cardinal Health sterile water label lists no bacteriostat or antimicrobial agent and single-dose containers only."
        },
        {
            "q": "Can preservatives like benzyl alcohol change protein stability in solution?",
            "a": "In a 2017 study of one IgG1 antibody, preservatives were shown to decrease protein stability in solution and cause aggregation. That result covers that antibody, not peptides in general."
        },
        {
            "q": "What is the chemical formula and molecular weight of benzyl alcohol?",
            "a": "PubChem lists benzyl alcohol as C7H8O with a molecular weight of 108.14 and the IUPAC name phenylmethanol."
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                        "text": "It is a sterile preparation of water for injection with benzyl alcohol added as a bacteriostatic preservative. One Hospira label describes it as supplied in a multiple-dose container for repeated withdrawals when diluting or dissolving drugs."
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                        "text": "Benzyl alcohol. The Hospira label lists 0.9% (9 mg/mL) or 1.1% (11 mg/mL). Our 30 ml Pfizer Hospira USP vial is recorded at 0.9% benzyl alcohol."
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    "dates": {
        "published": "2026-10-28",
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