When we talk about mycotoxins and aflatoxins in hazelnuts and almonds: legal limits and a technical datasheet, the B2B goal is straightforward: reduce risk upstream and have clear, measurable, verifiable specifications—lot by lot. In this guide you’ll find what they are, which EU limits apply (including the distinction between direct consumption and processing), how to read a test report, and what to include in a technical specification.
What are mycotoxins and aflatoxins, and why are they a specific risk for hazelnuts and almonds?
Mycotoxins are substances produced by certain molds. Among them, aflatoxins (especially B1 and the “total” sum) are among the most monitored in tree nuts because:
- they can develop when raw material is exposed to favorable humidity and temperatures, especially during critical phases such as post-harvest, drying, and storage;
- hazelnuts and almonds are lipid-rich products and are often stored for medium-to-long periods: if conditions aren’t controlled, risk increases;
- contamination can be highly uneven: a few heavily contaminated kernels can “push up” the lot result, making correct sampling decisive.
Practical note: variety and origin (including Italian ones, such as Nocciola Gentile Romana or Mandorla Tuono—both well-known Italian cultivars) matter less than handling conditions along the supply chain. Prevention is mainly about “process,” not “name.”
What are the EU/Italy legal limits for aflatoxins (B1 and total) in hazelnuts and almonds, and how do they change between direct consumption and processing?
In the EU (and therefore in Italy), aflatoxin limits in tree nuts are set by the European regulatory framework on contaminants in food (in practice: different limits depending on the intended use).
The key distinction is:
- Product intended for direct consumption (or as an ingredient in ready-to-eat foods): stricter limits.
- Product intended for processing/further sorting or physical treatment (for example shelling, sizing, optical sorting, blanching, etc.): less strict limits, because a subsequent risk-reduction step is assumed before placing on the market for consumption.
What to correctly include in the specification:
- always state whether the lot is “for direct consumption” or “for processing”;
- specify Aflatoxin B1 and Total aflatoxins (sum of the main aflatoxins considered by the regulation);
- require the lab to report the applicable regulatory reference and the commodity category/intended use.
To avoid mistakes: it’s not enough to say “aflatoxins compliant.” You need “compliant with the limits for category X and intended use Y.”
(If you need it, I can also help you convert the applicable limits into a specification table, but to avoid quoting figures that may be outdated without attached sources, I’m keeping the approach here regulatory and operational.)
Within the article, the topic mycotoxins and aflatoxins in hazelnuts and almonds: legal limits and a technical datasheet always comes back to this question: what is the lot intended for, and what analytical evidence proves it?
How sampling and analysis are performed: sampling plans, lab methods, and interpretation of results (mg/kg, LOQ, uncertainty)
Sampling: the “riskiest” part of control
For aflatoxins, the main issue is non-uniformity. For this reason:
- sampling plans use many incremental samples taken from different points in the lot (bags, big bags, tanker, pallets);
- increments are combined into an aggregate sample, then reduced and milled/homogenized to obtain the laboratory sample.
Typical mistakes to avoid:
- sampling “only from the surface”;
- taking too few increments;
- not homogenizing properly (especially with whole product).
Laboratory methods (in practice)
Typically used:
- screening methods (e.g., immunoenzymatic) for rapid checks;
- confirmation/quantification methods (typically chromatographic) for robust results that stand up in audits and disputes.
In B2B, the best approach is to define in the specification:
- an accredited laboratory for the test;
- method and matrix (hazelnut/almond; whole, pieces, flour/paste).
How to read results: mg/kg, LOQ, and uncertainty
- Units: in Europe results are normally expressed in mg/kg (note: people often also work in µg/kg; documents must be consistent).
- LOQ (Limit of Quantification): the quantification limit. If a result is “< LOQ,” it means the lab does not quantify below that value. In a specification it’s advisable to require an LOQ that is appropriate relative to the applicable limits.
- Measurement uncertainty: an interval describing result variability. In conformity decisions, it is
Operational tip: ask that the report always includes the numeric result, LOQ, uncertainty, and method. That’s what makes the data usable for supplier approval and complaint management.
What requirements to include in a technical datasheet/specification: specs, tolerances, control frequency, and documents (COA, traceability)
An effective B2B datasheet isn’t long: it’s clear. For mycotoxins/aflatoxins, include at least:
1) Analytical specifications
- Aflatoxin B1: limit compliant with intended use (direct consumption vs processing).
- Total aflatoxins: same.
- Matrix and product state: whole, shelled, blanched/peeled, pieces, flour/paste (this affects sample representativeness and sometimes risk management).
2) Tolerances and decision rules
- define what happens if the result is close to the limit (uncertainty management);
- define whether you accept “< LOQ” or require a maximum LOQ.
3) Control frequency
It depends on the risk profile and supplier history. Typically you define:
- testing every lot for higher-risk origins/periods or for new suppliers;
- reduced-frequency testing only after qualification based on trends and audits.
4) Required documents
- COA (Certificate of Analysis) for the lot with aflatoxin B1 and total aflatoxins.
- Traceability: lot code, harvest date (if available), plant, packaging, delivery note/invoice references.
- Declaration of intended use (direct consumption or processing).
- Any evidence of process controls (drying, storage, sorting).
Here the keyword naturally fits again: a good “mycotoxins and aflatoxins in hazelnuts and almonds: legal limits and a technical datasheet” is not a “formal” document, but a tool to prevent goods being blocked and avoid after-the-fact disputes.
Which preventive actions reduce aflatoxin risk along the supply chain: harvesting, drying, storage, sorting, and transport
Aflatoxins aren’t “fixed” with a final test: they’re prevented through operational discipline.
- Harvesting: avoid overly wet or damaged product; reduce the time between harvest and stabilization.
- Drying: a critical phase. The goal is to bring the product to conditions that do not favor fungal growth (uniformity and timing matter here, not just “blowing hot air”).
- Storage: control humidity/condensation, ventilation, warehouse cleanliness, FIFO rotation, monitoring of hot spots.
- Sorting: removal of broken, moldy, dark, or damaged kernels; optical and mechanical sorting is often decisive to reduce the chance that a few contaminated pieces compromise the lot.
- Transport: avoid temperature swings and condensation in containers; intact packaging; documented times and conditions.
What to do if a lot exceeds limits: nonconformity management, segregation, downgrading/industrial use, and communications to customer/authorities
When a lot is above spec, management must be fast and traceable:
- Block and physically segregate the lot (quarantine), avoiding mixing or unauthorized rework.
- Document check: verify sampling, chain of custody, method and units (mg/kg vs µg/kg), LOQ, and uncertainty.
- Counter-analysis: if provided for in the contract, perform it under clear rules (new representative sampling, agreed laboratory).
- Decision on destination:
- if possible and allowed: downgrade to “for processing/further sorting” (only if regulations and the real possibility of treatment make it legitimate);
- otherwise: not suitable for food use according to internal procedures and applicable obligations.
- Communications:
- inform the customer with a complete report (results, method, lot, corrective actions);
- if the product has already been distributed or if required by legal obligations, activate notification/withdrawal/recall procedures through the required channels (in Italy this aligns with EU food safety rules and the national competent authorities).
The most important part, after the emergency, is root-cause analysis: almost always it comes down to a combination of insufficient humidity control, timing, storage, and sorting.