Qualifying a supplier for a functional assay material is a different exercise from qualifying one for a marker botanical, because the headline number on the CoA is only meaningful if you know how it was produced. A white kidney bean supplier can be honest, cheap and useless at the same time — honest units from a generous assay. This framework scores what actually predicts a repeatable, functional material, and names the red flags that should end a conversation before the scoring starts.
Before You Score Anyone: Three Disqualifying Red Flags
These are not point deductions. They are reasons to stop.
- An activity figure with no method behind it. "Amylase inhibition: 4,000 U/g" with no assay identified, and no protocol available on request, is not a specification — it is a number chosen to be larger than yours. For a functional assay material, the method is the meaning.
- No lectin line, or reluctance about one. Every serious Phaseolus vulgaris supplier tests haemagglutinating activity, because the thermal step that destroys PHA is the heart of their process. A supplier who has never run the test either does not control processing or does not do the processing — both disqualifying for this material.
- A price at bean-flour level. Processed, activity-verified extract carries real manufacturing cost above the food-commodity bean. A quotation near the price of flour is telling you what is in the drum. Ask for the explanation; do not expect a good one.
On comparing quotations: unit figures from different suppliers are not comparable — a 6,000 U/g offer is not "twice as strong" as a 3,000 U/g offer unless both were assayed under one protocol. The only clean comparison is a side-by-side assay of both candidates at a single laboratory you nominate. Collect quotes on price per kilogram, but award the business on price per verified unit of activity, measured on your terms.
The Scoring Framework
Weighted to 100 points across five dimensions. Score each supplier independently, ideally before you see their price, so that commercial pressure does not colour the technical assessment.
1. Activity, Identity and Analytical Rigour — 30 points
| Criterion | Points |
|---|---|
| Batch-specific CoA with methods named per parameter | 7 |
| Activity by in-vitro enzymatic assay, protocol and unit definition disclosed on request | 8 |
| Assay method held constant across consecutive batches | 4 |
| Total protein by Kjeldahl, NLT 40%, plus SDS-PAGE species identity | 5 |
| Ash, acid-insoluble ash and loss-on-drying lines present | 4 |
| Carriers and excipients declared by name and percentage | 2 |
2. Safety and Compliance Readiness — 25 points
| Criterion | Points |
|---|---|
| Lectin (PHA) tested by haemagglutination assay on every batch, not detectable | 8 |
| Heavy metals by ICP-MS with numeric per-element limits (not "complies") | 5 |
| Full USP microbiological panel including pathogens | 4 |
| EU pesticide MRL screening available with a real report; non-ETO declaration | 4 |
| Testing at a NABL-accredited (or ISO 17025 equivalent) laboratory | 4 |
The PHA weighting is deliberate. On most botanicals the anchor safety line is heavy metals; on this one it is the lectin, because it is the parameter where processing failure becomes a consumer-safety issue rather than a potency shortfall. A supplier who treats the haemagglutination test as exotic has not shipped this material into a seriously audited supply chain.
3. Traceability and Sourcing — 15 points
| Criterion | Points |
|---|---|
| Seed-only, correct-species (P. vulgaris, white-seeded) declaration per batch | 5 |
| Country and region of origin stated; food-grade raw-material chain | 4 |
| Batch traceable back to raw-material lot | 4 |
| Non-GMO IP chain intact where non-GMO is claimed | 2 |
4. Consistency and Capability — 15 points
| Criterion | Points |
|---|---|
| Three consecutive batch CoAs showing activity consistency under one method | 6 |
| Multiple grades available (3,000 U/g, high-activity, ratio, non-GMO) | 4 |
| Custom specification capability confirmed in writing | 3 |
| Retention samples held and available | 2 |
The three-consecutive-batch request works even harder here than on marker botanicals, because it checks two things at once: whether the process holds its activity, and whether the assay method quietly changed between certificates. Identical figures across batches are their own warning — a functional assay on natural material varies.
5. Commercial Terms and Responsiveness — 15 points
| Criterion | Points |
|---|---|
| Incoterms quoted properly (EXW/FOB/CIF/CIP) to your named destination | 4 |
| Written payment terms on a proforma invoice, not verbal | 3 |
| Realistic stated lead times, including documentation | 3 |
| Samples supplied with the same CoA standard as bulk | 3 |
| Technical questions answered by someone who understands the assay | 2 |
That last line is cheap to test: ask why their units might differ from another supplier's. A contact who can explain method dependence in plain terms has real technical depth behind the sales desk; one who answers "ours is stronger" has just scored the point for someone else.
Interpreting the Score
| Score | Reading |
|---|---|
| 85–100 | Qualified for bulk supply. Proceed to sample and side-by-side verification. |
| 70–84 | Workable with conditions. Identify the gaps and require them closed in writing before first bulk order. |
| 55–69 | Suitable for trial quantities only, with independent testing on every lot. |
| Below 55 | Not a supplier for a regulated market. The documentation burden will fall on you. |
The Sample Stage Is Part of the Assessment
- Does the sample come with a batch-specific CoA including the activity figure, method and PHA line — or a generic specification sheet?
- Is the sample from a production batch? Ask for the batch number, then order bulk against that same specification and verify.
- How long did it take? Seven to fourteen business days including documentation is normal for India-origin material.
- Did they ask you anything? A supplier who does not ask about your format's process temperatures has not understood their own product — heat sensitivity is the first question a competent maker of this material asks a formulator.
First-Order Protocol
- Nominate an independent laboratory — Eurofins, SGS or Intertek — for pre-shipment sampling, testing activity, protein and PHA at your cost, side by side with your incumbent material where one exists.
- Compare the independent report line by line against the supplier CoA, remembering that an activity gap may be method difference rather than fraud — which is precisely why the protocol must be disclosed.
- Retain your own sealed, dated sample of the shipped lot for the shelf life of the material, stored below 25°C.
- Re-verify at batch three and then annually, or on any change of season, site or assay method.
SV Botanica supplies bulk white kidney bean extract from certified manufacturing facilities in India with batch-specific CoAs from NABL-accredited laboratories, disclosed assay conditions, and PHA verified not detectable per batch — and welcomes buyer-nominated third-party pre-shipment testing. The full parameter list is on the product page; the specification logic behind it is in the buyer's guide, and the failure modes it defends against are in adulteration and authenticity.
Source Activity-Standardised White Kidney Bean Extract from India
α-Amylase inhibitory activity NLT 3,000 U/g · lectin (PHA) controlled · high-activity, ratio & non-GMO grades · CoA-backed · samples for qualified buyers