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            "value": "Why metal peptide pens beat plastic for research",
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            "q": "Does the V1 pen work with any 3ml glass cartridge?",
            "a": "The V1 accepts standard 3ml glass cartridges with matching thread specifications; always verify compatibility before purchasing cartridges."
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            "q": "How does metal compare to plastic for peptide storage?",
            "a": "Neither glass nor plastic is perfectly inert: glass flakes due to chemical delamination have been observed in parenteral liquid formulations after long-term storage (Jiang et al. 2013), the unpredictable nature of peptide binding to surfaces requires optimization of experimental containers (Goebel-Stengel et al. 2011), and cetrorelix adsorbed more to glass than to polypropylene (Grohganz et al. 2004)."
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