Reviewed by Vitthia Rama Murti, Lab Pharmacist (BSc Hons Pharmacy), Bionutricia. Written for B2B ingredient buyers — general guidance, not a substitute for your own regulatory and QA review.
Every bulk botanical extract should ship against a written contaminant specification covering four families of risk: heavy metals, microbial load, pesticide residues, and mycotoxins. A compliant Certificate of Analysis (COA) states a defined limit and a tested result for each — not a blank or a “complies” tick. This checklist shows B2B buyers exactly what to require before a purchase order.
Quick facts
- Four contaminant families: heavy metals · microbial · pesticides · mycotoxins
- Golden rule: a real spec shows a numeric limit + a tested result for each parameter
- Verify against: your destination market’s food/supplement regulation and each product’s own COA
- Bionutricia QC: FSSC 22000, GMP, HACCP, JAKIM Halal, US FDA registration, MeSTI & NanoVerify; per-lot testing
What contaminants should a botanical extract specification control?
A botanical extract concentrates whatever the raw plant carried — including trace contaminants — so a bulk ingredient buyer needs a specification that names limits for each contaminant family and evidences them on a batch-specific COA. The four families that belong in every spec are heavy metals, microbiological load, pesticide residues, and mycotoxins. Identity and adulteration controls sit alongside them: a clean contaminant profile means little if the material isn’t the species you ordered. Treat any parameter that is missing, blank, or marked only “complies” as an open question to resolve before you release a purchase order.
What heavy-metal limits should you require?
Heavy metals are the most commonly specified contaminant class because plants take up metals from soil and water. Four elements are controlled almost universally. The limits below are typical values referenced across recognised standards such as USP <2232> (elemental contaminants in dietary supplements), Codex, and EU Regulation 2023/915 — confirm the exact figure required by your market and check each product’s COA, as tighter limits apply to some categories and destinations.
| Element | Commonly specified limit | Why it matters |
|---|---|---|
| Lead (Pb) | ≤ 3.0 ppm (often tighter) | Most heavily regulated; limits vary by market and product form |
| Arsenic (As) | ≤ 1.5–3.0 ppm | Inorganic vs total arsenic may be specified separately |
| Cadmium (Cd) | ≤ 1.0 ppm | Accumulates in leafy and root botanicals |
| Mercury (Hg) | ≤ 0.1 ppm | Lowest typical threshold of the four |
Ask which analytical method was used. ICP-MS is the modern reference technique and detects far below these thresholds; older colourimetric methods are less sensitive. A credible COA names the method and reports an actual figure (for example “Pb: 0.21 ppm”), not just “pass”.
Which microbial limits matter for extract powders?
Microbiological specifications protect against spoilage organisms and pathogens. For botanical ingredients, buyers typically reference USP <2021>/<2022> or equivalent pharmacopoeial and food-safety limits. Two are expressed as maximum counts and the rest as presence/absence in a defined sample size:
| Parameter | Typical limit |
|---|---|
| Total aerobic microbial count (TAMC / TPC) | ≤ 104 cfu/g |
| Total yeast & mould (TYMC) | ≤ 103 cfu/g |
| Bile-tolerant Gram-negative / coliforms | ≤ 102–103 cfu/g |
| Escherichia coli | Absent in 1 g |
| Salmonella | Absent in 10 g (or 25 g) |
| Staphylococcus aureus | Absent in 1 g |
The sample size behind an “absent” result matters — absence in 25 g is a stricter claim than absence in 1 g. Confirm the tested quantity and, for pathogens, that the method follows a recognised protocol (ISO or pharmacopoeial). Water activity also belongs on the same conversation: a low, stable water activity is what keeps microbial counts down through shelf life.
What about pesticides, mycotoxins and adulteration?
Beyond metals and microbes, three further checks separate a serious supplier from a repacker:
- Pesticide residues: require conformance to Codex or EU maximum residue limits (MRLs), or a multi-residue screen (e.g. GC-MS/MS and LC-MS/MS panels). Field-grown botanicals carry the highest risk.
- Mycotoxins: for susceptible materials, specify aflatoxins (total and B1) and, where relevant, ochratoxin A, tested to your market’s threshold — EU limits for aflatoxin B1 in many botanicals are in the low parts-per-billion.
- Identity & adulteration: ask for the botanical (species) confirmation and a marker/assay figure so you know the material is the correct plant part at the declared strength — not a diluted or substituted lot.
Residual-solvent controls also apply to solvent-based processes. (Bionutricia does not publish process solvent details; the finished extract is released against residual-solvent conformance where applicable.)
How do you read these limits on a COA?
A contaminant spec is only as good as the COA that evidences it. On a compliant certificate, each parameter appears on its own row with three columns: the parameter, the specification limit, and the tested result for that specific lot. Watch for three red flags — a “complies”/”conforms” tick with no number, a result identical across unrelated batches (a sign of a copied template), and a report date that predates the manufacturing date. For a line-by-line walkthrough, see our guide on how to read a botanical extract COA, linked below.
Your contaminant-spec checklist
Before you release a bulk order, confirm every line:
| Check | What “good” looks like |
|---|---|
| Heavy metals (Pb, As, Cd, Hg) | Numeric limit + tested result, method named (ICP-MS) |
| Microbial panel | TAMC, TYMC + pathogen absence with sample size stated |
| Pesticides | Codex/EU MRL conformance or residue screen |
| Mycotoxins (where relevant) | Aflatoxin limit tested to market threshold |
| Identity & strength | Species confirmed + marker/assay figure |
| Batch traceability | Lot number links COA to the delivered material |
| Testing source | In-house QC plus accredited third-party verification |
How Bionutricia controls contaminants
Bionutricia is a Malaysian botanical-extract manufacturer operating a food-safety system certified to FSSC 22000, with GMP, HACCP, JAKIM Halal, US FDA registration, MeSTI and NanoVerify. Contaminant control starts at raw-material intake and runs through in-process checks to finished-goods release, with heavy-metal, microbial, pesticide and mycotoxin testing applied per lot and confirmed by accredited third-party laboratories. Our patented enzymatic and ultrasonic extraction process (MY-188945-A) is designed for high active yield under controlled conditions. Every bulk shipment is released against a batch-specific COA, and full specification and documentation packs are available to qualified B2B buyers on request.
Need a full contaminant spec and sample COA for a specific extract?
Related guides
Frequently asked questions
Which heavy metals are tested in botanical extracts?
The four controlled almost universally are lead (Pb), arsenic (As), cadmium (Cd) and mercury (Hg). Some markets and product categories add elements such as chromium or require inorganic arsenic to be reported separately. ICP-MS is the reference method.
What is a typical total plate count limit for extract powders?
A total aerobic microbial count (TAMC/TPC) of ≤ 104 cfu/g and total yeast & mould of ≤ 103 cfu/g are common references, alongside absence of E. coli, Salmonella and S. aureus. Always confirm the sample size behind each “absent” result.
Do botanical extracts need pesticide-residue testing?
Field-grown botanicals carry a real pesticide risk, so buyers commonly require conformance to Codex or EU maximum residue limits, or a multi-residue screen. The requirement is stricter for leaf and aerial-part materials than for many fruit-derived extracts.
What is the difference between in-house and third-party COA testing?
In-house testing gives fast per-lot control; accredited third-party testing provides independent verification a buyer’s own QA can trust. The strongest suppliers do both — routine in-house release testing plus periodic or per-lot third-party confirmation.
Does Bionutricia test every batch for contaminants?
Yes. Contaminant testing is applied per lot as part of finished-goods release, and every bulk shipment is accompanied by a batch-specific Certificate of Analysis. Full specification and documentation packs are available to qualified buyers on request.
