Cereulide in Food Products: Risks, Detection, and Regulatory Insights

What is Cereulide?

Cereulide is a heat-stable emetic toxin produced by specific strains of Bacillus cereus. It is therefore not the bacterium itself, but a pre-formed toxin present in the food matrix.

This distinction is critical in practice, as microbiological detection of Bacillus cereus does not automatically confirm the presence of cereulide. Due to the heat stability of the toxin, a negative result is also not sufficiently conclusive. EFSA, BfR, and FDA accordingly classify cereulide as a toxicologically relevant compound in its own right.

In addition, cereulide is highly stable to acid, heat, and enzymatic degradation. Once present in a product, the associated risk cannot be reliably eliminated through standard preparation, heating, or reconstitution.

Especially in infant formula and other sensitive food categories, targeted toxin analysis is therefore scientifically justified.

Regulatory Status in the EU

Based on the current publicly available information, no harmonized EU maximum limit for cereulide across all food categories has been established.

Regulatory handling is currently based on crisis management, scientific risk assessment, and specific risk-based measures. In 2026, in response to the cereulide incident in infant formula, the European Commission activated the crisis coordination network and published key measures at EU level.

The primary scientific reference is the EFSA risk assessment from 2026. EFSA established an acute reference dose (ARfD) of 0.014 µg/kg body weight for infants and identified concentration levels in reconstituted infant formula and follow-on formula that may be of safety concern.

A specific EU measure concerns arachidonic acid oil (ARA oil) from China. Implementing Regulation (EU) 2026/459 strengthened official import controls following the identification of a contamination risk with cereulide.

According to Commission records, there is currently no immediate plan to introduce a general legal maximum limit for cereulide in ARA oil or infant formula. Risk management therefore remains case-based, relying on EFSA assessments and general food law principles.

How Does Cereulide Enter
Food Products?

Cereulide formation occurs when cereulide-producing Bacillus cereus strains generate the toxin under suitable conditions in food or ingredients.

Contamination is therefore a two-step process:

• The relevant microorganism must be present in raw materials, intermediates, or the production environment.
• Toxin formation must occur under favorable conditions.

The FDA explicitly describes cereulide as a “pre-formed toxin” in food.

Recent international incidents have demonstrated that contamination can propagate across multiple finished products and countries via shared ingredient streams.

WHO, EFSA, and ECDC linked recalls to arachidonic acid-containing oil (ARA oil) as a common ingredient in affected infant formula products. WHO reported that affected products and related ingredients were distributed across 99 countries and territories.

From an analytical perspective, cereulide determination is particularly challenging in complex matrices. The FDA describes quantitative analysis involving acetonitrile extraction followed by LC-MS/MS.

This highlights that cereulide cannot be reliably inferred from microbiological results alone and requires targeted chemical analysis.

What Are the Effects of Cereulide?

Typical acute effects of cereulide exposure include nausea and vomiting, and in some cases diarrhea.

EFSA and BfR consistently identify these as the primary acute symptoms. In EFSA’s risk assessment, vomiting was explicitly used as the critical endpoint for deriving the ARfD for infants.

Infants are particularly at risk due to their increased susceptibility to dehydration and electrolyte imbalance.

EFSA and ECDC explicitly classify very young infants as a vulnerable group in the current event context, while WHO assessed the public health risk as moderate.

In rare cases, cereulide exposure may result in severe outcomes. BfR notes that, beyond typical gastrointestinal symptoms, life-threatening intoxications may occur in exceptional cases.

For sensitive product categories, even comparatively low concentrations require robust analytical and toxicological evaluation.

Why Direct Toxin Detection Matters

Microbiological testing for Bacillus cereus provides valuable insights into hygiene status, process control, and potential contamination sources.

However, when the emetic toxin cereulide is the focus, direct detection of the toxin itself is essential.

A robust risk assessment requires answering three key questions:

• Is cereulide present?
• In which matrix does it occur?
• At what concentration is it present?

These data are critical for:

• Suspected cases, complaints, and sensory deviations
• Retain samples and atypical batches in quality assurance
• Release and hold decisions for sensitive products
• Risk assessments in product categories such as infant formula, cereal-based foods, and high-fat products
  
  

Analytical Services by ALS

ALS in Germany

ALS offers cereulide analysis in food using LC-MS/MS. Testing is performed according to an in-house method based on ISO 18465:2017, employing a ¹³C-labeled internal standard.

The method supports companies in suspected cases, complaint investigations, release decisions, and evaluation of sensitive product categories.

Method Characteristics and Advantages

• Targeted cereulide detection using LC-MS/MS
• In-house method based on ISO 18465:2017
• ¹³C-labeled internal standard for accurate quantification
• Selective and sensitive determination in validated food matrices
• Short turnaround times and practical implementation

Sample Requirements

• Sample amount: minimum 50–100 g
• Sampling: aseptic, preferably in sterile bags or containers
• Shipping: ideally chilled
• Storage: frozen until analysis
  
  

Validated Food Matrices and Limits of Quantification (LOQ) in Germany

ALS in Singapore

ALS Singapore has currently validated the method for powdered infant formula, liquid milk, and infant cereals.

Extension to oil-containing and starch-rich food matrices is planned. This complements the German service portfolio and supports international customer requirements.

The applied LC-MS/MS technology provides high sensitivity, high specificity, and a broad dynamic range for the determination of low-level analytes in complex matrices.

Matrix effects can be minimized while delivering precise results within short timeframes. LC-MS/MS is therefore the analytical method of choice for demanding food matrices.

ALS in New Zealand

Through its JV company CAIQTEST (Pacific)

Cereulide analysis in dairy products by LC-MS/MS. Testing is performed according to an in-house method based on ISO 18465:2017 and is used for testing raw materials used in dairy product manufacture as well as finished dairy products for toxin residues.

Method Characteristics and Advantages

• Targeted cereulide detection using LC-MS/MS with low levels of detection
• In-house method based on ISO 18465:2017
• Developed with knowledge of methods being used for cereulide analysis in China
• Short turnaround times
• Submitted for ISO17025 accreditation under NZ (IANZ) and Chinese (CNAS) scopes

Sample Requirements

• Sample amount: 100 g
• Sampling: normal procedures for dairy products being submitted for chemical analysis
• Shipping: ideally chilled

Validated Food Matrices and Limits of Quantification (LOQ) in New Zealand

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