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Quantification Ladder

A four-tier framework for measuring compound or enzyme content in Open Enzyme outputs (engineered koji, medicinal mushroom extracts, future TCM and siRNA tracks). The ladder lets a distributed open-source contributor work at the lowest rigor tier their use case tolerates, while staying anchored to a higher-rigor calibration done once per protocol revision.

This page is the canonical definition of the framework. Track-specific instantiations (assay chemistry, target compounds, calibration anchors) live in their own protocol pages and reference this one.

The four tiers

Tier Equipment ceiling Output type Use case
1. Kitchen Hand tools, eyes, kitchen scale, basic reagents (vinegar, milk, starch, gelatin). Marginal cost ~$0. Visual or categorical readings; inter-sample ratios at fixed conditions. Not absolute units. Batch-to-batch consistency check; "did this batch ferment to a normal load?"; end-user dosing tied to a Tier 3-calibrated extract ratio.
2. Smartphone colorimetry Tier 1 plus a phone photometer rig (3D-printed cuvette holder or a DIY box with a fixed light source) plus a small reagent kit (DNS, ninhydrin, p-NPP, DTNB, phenol-sulfuric, etc.; ~$50–80 in single-experiment quantities). A405 / A440 / A540 readings translated to relative concentration; with proper standard curves, semi-absolute units. Batch tracking against a calibrated reference; mid-rigor surveillance for distributed contributors without lab access.
3. Bench Calibrated spectrophotometer, HPLC or comparable, balance, pipettes, qualified analytical standards. Equipment ~$2K capital, ~$200–500 per run. Publication-grade U/mL or mg/g with cited standards and a validated method. Initial calibration per protocol revision; clinical / synergy-experiment-grade data; the ground truth that anchors every Tier 1 and Tier 2 reading.
4. Outsourced Contract lab (GMP / GLP tier). ~$300–1,500 per sample. Audit-trail-grade certified analysis. One-time benchmarking before committing to in-house Tier 3; independent verification of a surprising Tier 3 result; regulatory submission.

The operational pattern: calibrate once, track batches cheap

  1. Initial Tier 3 calibration. Quantify a reference batch by the protocol's canonical bench method. Anchor numbers (e.g., mg cordycepin / g extract; U lipase / g koji). Document extract source, batch ID, lot, harvest conditions.
  2. Batch tracking at Tier 1 or Tier 2. For each new batch from the same protocol, run a cheap assay against the reference batch as the standard curve anchor. If the batch reads within ±20% of reference, accept. If outside, escalate to Tier 3 re-quantification or investigate the deviation.
  3. End-user dosing follows the Tier 3-calibrated ratio. "1 g of this batch ≈ 8 mg cordycepin per the SOP done on this lot." Tier 1 at the consumption side, not the characterization side.
  4. Tier 4 only on demand. Invoked when regulatory submission requires it, or when in-house Tier 3 produces a result surprising enough to want independent verification before publishing or acting clinically.

Why this matters operationally

Without the tiered framework, every batch would need a full Tier 3 instrumented assay. That is cost-prohibitive at scale and impossible for distributed open-source contributors without lab access. With it, Tier 3 is invoked once per protocol revision; Tier 2 handles batch consistency cheaply; Tier 1 keeps end-user dosing tied to verified content. This is the same discipline that lets the koji track work as a home-fermentation project rather than a CRO-only project, and that lets the medicinal mushroom track ship characterized compounds without an HPLC in every contributor's basement.

The ladder also catches a specific class of failure: dose-vs-product-content mismatches. If a commercial extract is marketed at one content level but a Tier 2 colorimetric check shows another, the discrepancy surfaces before downstream therapeutic-dose reasoning depends on the marketed number. See medicinal-mushroom-complement-track.md §"Reality check" for the Real Mushrooms Cordyceps-M case (3–4 mg cordycepin per 1 g serving at 0.4% content, surfaced by tier-discipline thinking).

Low-cost automation add-on (Picolab prior art, 2026-05-19). The ladder's main reproducibility bottleneck is often not assay chemistry; it is operator variation in serial dilution, mixing, transfer order, and image timing. Picolab v2 shows an open-source, non-production pattern for reducing that variance at tube scale: repurposed printer gantry, syringe actuation, G-code planning, camera snapshots, and operator-approved action execution. Treat this as optional method infrastructure for Tier ⅔ development, not as evidence that OE assays are automated or validated. First OE use should be benign dye/standard-curve work before any biological material. (Engineering prior art; source: Picolab v2 repository; see practitioner-toolkit.md)

Instantiations

  • Koji digestive enzyme quantification. enzyme-quantification-protocol.md. Lipase (olive-oil titration → p-NPP smartphone → spectrophotometer p-NPP or pH-stat → outsourced HUT or USP units). Amylase (starch-iodine clearance → DNS reducing-sugar smartphone → bench DNS or Bernfeld → outsourced). Protease (gelatin liquefaction or skim-milk plate → ninhydrin or azocasein smartphone → bench azocasein or pH-stat → outsourced).
  • Medicinal mushroom extract characterization. medicinal-mushroom-extract-sops.md §SOP-6. Cordycepin (visual dosing-by-ratio → speculative diazo Tier 2 pending verification, UV 260 nm fallback → HPLC SOP-2 → outsourced GMP-HPLC). EGT (visual → DTNB Ellman's thiol smartphone → HILIC-HPLC SOP-3 → outsourced). GLPP (visual + mass-balance → phenol-sulfuric total-polysaccharide smartphone → SEC-MALS SOP-1 → outsourced).
  • Microbiome-derived butyrate / SCFA quantification. tier-2-butyrate-assay-audit-computational.md (comp-038) found no ready-to-adopt home/colorimetric butyrate Tier 2 assay. Current path: GC-MS remains the Tier 3 anchor; HPLC-UV is a plausible Tier 2-lab candidate for culture supernatants after spike-recovery + GC-MS validation; electrochemical fecal SCFA profiling is a promising stool-specific future direction, not production-ready.
  • Future tracks. TCM compound triage (per tcm-modern-rigor-intersection.md) and siRNA / URAT1 modality (per sirna-urat1-modality.md) inherit the framework as new compound classes are added.

Discipline notes

  • Single source of truth for tier definitions. This page. Tier-specific assay details live in the instantiation pages; the abstract framework definition stays here. Reason: two parallel definitions diverge over time. The 2026-05-14 walkthrough caught the early drift between enzyme-quantification-protocol.md and medicinal-mushroom-extract-sops.md SOP-6 and consolidated them here.
  • Tier 3 is the calibration anchor for the others. Every Tier 1 and Tier 2 reading needs to translate back to an absolute number, and the only way to get there is through a Tier 3 standard curve. Skipping Tier 3 ("we'll just do Tier 1 forever") collapses inter-sample ratios into vibes.
  • Tier 4 is not a default escalation. Outsourced assay is for one-time benchmarking or regulatory submission, not routine analysis. The 10× cost gap from Tier 3 to Tier 4 is not value-additive unless you specifically need the audit trail or the GMP chain of custody.
  • The framework is operational quality, not novelty. Adopting it does not require any new science. It requires the discipline to run the calibration step once, log the reference numbers somewhere persistent, and trust the cheap-tier readings against that anchor.

See also