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    "title": "Your pepper pen click delivers less than you think",
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    "tldr": "Most reconstitution pens have dead volume that makes each click deliver less than the label suggests. Here's the exact volume math for the Gansulin pen.",
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            "value": "Most reconstitution pens have dead volume that makes each click deliver less than the label suggests. Here's the exact volume math for the Gansulin pen.",
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            "value": "What it is",
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            "value": "Metal housing vs. plastic: what changes at the bench",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-pepper-pen-click-delivers-less-than-you-think)",
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            "value": "Glass cartridge tolerances and what they mean for your data",
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            "value": "Dead volume and click math: the calculation most researchers skip",
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            "value": "NCBI PubChem CID 244: Benzyl Alcohol (C7H8O) - pubchem.ncbi.nlm.nih.gov",
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            "value": "Jonker et al., Int J Clin Pharmacol Ther 2021: First pre-filled pen device with highly purified human menopausal gonadotropin (HP-hMG, Menopur) in liquid is shown to be bioequivalent to powder for reconstitution - pmc.ncbi.nlm.nih.gov",
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            "value": "Bacteriostatic Water for Injection, USP: FDA label on DailyMed, U.S. National Library of Medicine (0.9% benzyl alcohol) - dailymed.nlm.nih.gov",
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            "q": "What is a pepper pen used for in peptide research?",
            "a": "A pepper pen is a reusable, metal-bodied pen that accepts a standard 3 ml glass cartridge loaded with reconstituted peptide solution and dispenses precise, click-metered volumes at the bench across an experiment."
        },
        {
            "q": "How do I calculate click volume for a peptide pen?",
            "a": "Fill the cartridge with water, dial out 10 clicks onto a tared analytical balance, and divide the mass by 10. That gives your actual µL per click for that cartridge batch, since water density is approximately 1.00 g/mL."
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            "q": "What diluent should I use with a 3 ml glass cartridge peptide pen?",
            "a": "Use bacteriostatic water (0.9% benzyl alcohol) for multi-session experiments stored at 4°C. Use dilute acetic acid for peptides that aggregate at neutral pH. Use plain sterile water for single-session use only."
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