What does this research mean for the field?

Mass rearing of Tenebrio molitor larvae on cereal-based substrates presents minor risks for mycotoxin and heavy metal contamination, with concentrations generally remaining below limits of detection. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To assess chemical and microbiological food safety risks by screening for microfungi, mycotoxins, and heavy metals in mass-reared Tenebrio molitor larvae and their feeding substrates.

August 22, 2026InsectsOpen Access

Microfungi, Mycotoxins and Heavy Metals in the Mass Rearing of Tenebrio molitor L. Larvae

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To assess chemical and microbiological food safety risks by screening for microfungi, mycotoxins, and heavy metals in mass-reared Tenebrio molitor larvae and their feeding substrates.
Screened microfungi species via MALDI-TOF, evaluated colony-forming units (CFU), and measured water activity across four substrate and meal samples with nine replicates each.
Quantified multi-mycotoxin profiles across nine samples using LC-MS/MS and analyzed six heavy metals (Cd, Pb, Hg, Sb, As, Cr) in three substrates and insect meal using ICP-OES/MS.
Identified eight mycobiont species with low CFU counts (<3 × 10³ CFU/g) and low water activity levels (0.35–0.59), indicating minimal risk of fungal proliferation.
All mycotoxin concentrations were below limits of detection (aflatoxins <0.50 µg/kg; DON/FuB1/FuB2 <50 µg/kg; HT2/T2 <20 µg/kg; NIV <150 µg/kg; OTA <1 µg/kg; ZEA <5 µg/kg).
Heavy metal concentrations across substrates and insect meal were below detection limits (<0.2 mg/kg), except for chromium in malt residual pellets (0.4 mg/kg).

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Implication

Risk assessment reveals low fungal, mycotoxin, and heavy metal contamination in mass-reared mealworms, suggesting safe potential for insect-based novel food production.

Cite This Study

Rehorska et al. (2026) studied this question.

synapsesocial.com/papers/6a895ffeca7ade938187f043 https://doi.org/10.3390/insects17080866

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Implication

Risk assessment reveals low fungal, mycotoxin, and heavy metal contamination in mass-reared mealworms, suggesting safe potential for insect-based novel food production.

Microfungi, Mycotoxins and Heavy Metals in the Mass Rearing of Tenebrio molitor L. Larvae

Key Points

Discussion

Implication

Cite This Study

Microfungi, Mycotoxins and Heavy Metals in the Mass Rearing of Tenebrio molitor L. Larvae

Key Points

Discussion

Implication

Cite This Study