{
    "schema": 1,
    "fid": "why-your-3ml-peptide-cartridge-might-hold-less-than-you",
    "type": "article",
    "object_id": 668,
    "title": "Why your 3ml peptide cartridge might hold less than you",
    "entity": "Why your 3ml peptide cartridge might hold less than you",
    "url": "https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you",
    "facts_url": "https://www.preppinpeppers.com/facts/why-your-3ml-peptide-cartridge-might-hold-less-than-you",
    "currency": null,
    "tldr": "Dead volume is the liquid left trapped inside a cartridge after withdrawal. In a 3ml cartridge it typically takes 0.1ml to 0.4ml of the nominal capacity.",
    "facts": [
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:title",
            "category": "identity",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "title",
            "value": "Why your 3ml peptide cartridge might hold less than you",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:published",
            "category": "identity",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "published",
            "value": "2026-08-15",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:author",
            "category": "identity",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "author",
            "value": "Preppin' Peppers Editorial Team",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:topics",
            "category": "identity",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "topics",
            "value": "3ml cartridge, peptide pen, reconstitution, research",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:summary",
            "category": "content",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "summary",
            "value": "Dead volume is the liquid left trapped inside a cartridge after withdrawal. In a 3ml cartridge it typically takes 0.1ml to 0.4ml of the nominal capacity.",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:section-1",
            "category": "content",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "section",
            "value": "What dead volume is",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:section-2",
            "category": "content",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "section",
            "value": "What actually determines usable volume",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:section-3",
            "category": "content",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "section",
            "value": "Glass vs plastic: the purity question",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:section-4",
            "category": "content",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "section",
            "value": "Pen compatibility and what \"3ml\" really means",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:section-5",
            "category": "content",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "section",
            "value": "The mistakes that cost researchers the most",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:section-6",
            "category": "content",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "section",
            "value": "What actually matters when you're at the bench",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:section-8",
            "category": "content",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "section",
            "value": "What the research community gets wrong about 3ml peptide cartridges",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:source-pubmed-ncbi-nlm-nih-gov",
            "category": "source",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "cites",
            "value": "Jiang et al. 2013 - pubmed.ncbi.nlm.nih.gov",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://pubmed.ncbi.nlm.nih.gov/23872443/"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:source-pmc-ncbi-nlm-nih-gov",
            "category": "source",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "cites",
            "value": "Goebel-Stengel et al. 2011 - pmc.ncbi.nlm.nih.gov",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://pmc.ncbi.nlm.nih.gov/articles/PMC3290000/"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:source-pubmed-ncbi-nlm-nih-gov-2",
            "category": "source",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "cites",
            "value": "Grohganz et al. 2004 - pubmed.ncbi.nlm.nih.gov",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://pubmed.ncbi.nlm.nih.gov/14757490/"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:product-gansulin-metal-peptide-pen",
            "category": "products",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "references product",
            "value": "Gansulin Pen · Reusable Click-Dial, 3 ml (1-60 Units)",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://www.preppinpeppers.com/products/gansulin-metal-peptide-pen"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:product-gansulin-3ml-cartridge",
            "category": "products",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "references product",
            "value": "Gansulin-Compatible 3 ml Glass Cartridge for Pens (10-Pack)",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://www.preppinpeppers.com/products/gansulin-3ml-cartridge"
        },
        {
            "id": "why-your-3ml-peptide-cartridge-might-hold-less-than-you:source-pubmed-ncbi-nlm-nih-gov-3",
            "category": "source",
            "entity": "Why your 3ml peptide cartridge might hold less than you",
            "attribute": "cites",
            "value": "Jenke, Expert Opin Drug Deliv 2014: Extractables and leachables considerations for prefilled syringes - pubmed.ncbi.nlm.nih.gov",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you)",
            "evidence": "https://pubmed.ncbi.nlm.nih.gov/24955780/"
        }
    ],
    "buy": [],
    "faq": [
        {
            "q": "What is dead volume in a peptide cartridge?",
            "a": "Dead volume is the liquid that stays trapped in the cartridge after you draw what you need, usually 0.1-0.4ml depending on cartridge design."
        },
        {
            "q": "Glass vs plastic cartridge for peptides?",
            "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)."
        },
        {
            "q": "How do I calculate correct peptide concentration with cartridge dead volume?",
            "a": "Subtract the dead volume from your total diluent added, then calculate concentration based on the usable volume actually in your vial."
        }
    ],
    "jsonld": [
        {
            "@context": "https://schema.org",
            "@type": "Article",
            "headline": "Why your 3ml peptide cartridge might hold less than you",
            "url": "https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you",
            "mainEntityOfPage": "https://www.preppinpeppers.com/blogs/the-lab/why-your-3ml-peptide-cartridge-might-hold-less-than-you",
            "datePublished": "2026-08-15",
            "dateModified": "2026-10-16",
            "author": {
                "@type": "Person",
                "name": "Preppin' Peppers Editorial Team"
            },
            "publisher": {
                "@type": "Organization",
                "name": "PreppinPeppers"
            },
            "description": "Dead volume is the liquid left trapped inside a cartridge after withdrawal. In a 3ml cartridge it typically takes 0.1ml to 0.4ml of the nominal capacity."
        },
        {
            "@context": "https://schema.org",
            "@type": "FAQPage",
            "url": "https://www.preppinpeppers.com/facts/why-your-3ml-peptide-cartridge-might-hold-less-than-you",
            "mainEntity": [
                {
                    "@type": "Question",
                    "name": "What is dead volume in a peptide cartridge?",
                    "acceptedAnswer": {
                        "@type": "Answer",
                        "text": "Dead volume is the liquid that stays trapped in the cartridge after you draw what you need, usually 0.1-0.4ml depending on cartridge design."
                    }
                },
                {
                    "@type": "Question",
                    "name": "Glass vs plastic cartridge for peptides?",
                    "acceptedAnswer": {
                        "@type": "Answer",
                        "text": "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)."
                    }
                },
                {
                    "@type": "Question",
                    "name": "How do I calculate correct peptide concentration with cartridge dead volume?",
                    "acceptedAnswer": {
                        "@type": "Answer",
                        "text": "Subtract the dead volume from your total diluent added, then calculate concentration based on the usable volume actually in your vial."
                    }
                }
            ]
        }
    ],
    "dates": {
        "published": "2026-08-15",
        "modified": "2026-10-16"
    }
}