Cereulide-mediated emetic (vomiting) toxicity of Bacillus cereus in infant formula: mitochondrial mechanisms, analytical methods, and risk assessment.

Abstract

Cereulide is a heat stable cyclic dodecadepsipeptide and potassium selective ionophore produced by Bacillus cereus, recognized as the causative agent of emetic food poisoning. Data indicate it exerts potent mitochondrial toxicity by collapsing membrane potential, uncoupling oxidative phosphorylation, depleting ATP, and triggering apoptosis at nanomolar concentrations. Its extreme lipophilicity (logPₒw ≈ 4) suggests partitioning into lipid rich ingredients including microbial oils used in powdered infant formula. In vitro studies demonstrate dose dependent suppression of oxygen consumption rate (EC₅₀ = 98-127 nM), indicating high bioenergetic toxicity. Neonates are considered uniquely vulnerable because immature renal clearance may prolong exposure, lipid rich matrices could increase absorption, and developing mitochondria may contribute to increased susceptibility. However, no cereulide-specific toxicokinetic or toxicodynamic data in this age group have been published. LC-MS/MS is the accepted reference method, but performance varies substantially, with elevated LOQs in lipid matrices likely due to ion suppression, and no matrix matched certified reference materials exist to support standardized measurement. Critical gaps include lack of neonatal models, developmental dose response data, and sufficient exposure data to calculate quantitative risk. Artificial intelligence shows only theoretical potential with no validated models available for risk assessment. Contamination has been linked to biofilms in oil processing environments, and heat stability means thermal treatments applied during manufacture are unlikely to reduce levels once formed. This review synthesizes available evidence, explicitly identifying uncertainties and data gaps as the main limitation to robust regulation, and defines five priorities to guide future research and safety standards.