What is cereulide toxin in milk? Risks and effective testing methods

– In the dairy industry, controlling microorganisms always comes first. However, a hazard that is often missed is the cereulide toxin (often misspelled "cereuline"), produced by the bacterium Bacillus cereus.

– Unlike the bacterium itself, cereulide is a heat-stable toxin that can persist even after pasteurization, posing a great risk to consumer health — especially for children.

⚠️ What is cereulide? Why is it dangerous in milk?

– Cereulide is an emetic toxin with alarming characteristics:

🔥 Highly heat-resistant → not destroyed by pasteurization
❄️ Stable at cold temperatures → bacteria can still produce the toxin under suboptimal storage conditions
🧪 No sensory change → hard to detect by taste or smell

👉 In milk, cereulide can appear when:

– Raw milk is contaminated with B. cereus

– Equipment sanitation is substandard

– Storage and transport do not maintain the temperature

Symptoms of cereulide toxin exposure

Consumers can experience symptoms after only 1–5 hours:

Nausea, violent vomiting
Abdominal pain
In severe cases: liver effects

👉 High-risk groups:

Young children
The elderly
People with weakened immune systems

🔬 Testing methods for cereulide toxin in milk

Testing cereulide today requires combining several different techniques:

1. LC-MS/MS method (the gold standard)

Technique: LC-MS/MS

Principle:

Extract the toxin from the milk sample
Separate by liquid chromatography
Identify by mass spectrometry

Advantages:

Accurate qualitative and quantitative determination
Very high sensitivity

Disadvantages:

Large investment cost
Needs a specialized laboratory

👉 This is the official confirmation method in modern testing laboratories.

2. PCR method – effective risk screening

- Technique: PCR (Real-time PCR)

– Detection: the ces gene — the gene encoding the cereulide toxin

Advantages:

– Fast, highly sensitive

– Suited to controlling raw material and the production environment

Note: PCR does not directly detect the toxin, only the bacterium's toxin-producing ability of the bacterium

👉 This is an extremely useful tool for dairy plant QC

3. Biological method (bioassay)

– Based on cereulide's toxicity to cells

– Evaluates the effect on mitochondria

Limitations:

– Not specific

– Long analysis time

👉 Rarely applied in practical testing today

4. Immunological method (ELISA, rapid test)

– Under development

- Not yet common because making a cereulide-specific antibody is difficult

Comparing the methods

So sánh các phương pháp test độc tố cereulide trong sữa

Solutions for controlling cereulide in the dairy industry

For safety, businesses should apply a combined strategy:

✅ Proactive screening

Checking B. cereus and the ces gene by PCR

✅ In-depth confirmation

Use LC-MS/MS when suspected

✅ Process control

– Maintain a strict cold chain

– Sanitize equipment (CIP)

– Control incoming raw materials

Conclusion

– The cereulide toxin is an "invisible" but extremely dangerous hazard in milk. Testing only microorganisms is not enough; busines

Understand the toxin-formation mechanism
Apply suitable testing methods
Proactively control from raw material to finished product

📞 Testing solutions from Thai Binh Duong

Thai Binh Duong Company provides:

– PCR test kits detecting the cereulide toxin-producing gene (ces gene)

– Fast, accurate testing solutions suited to dairy plant QC

👉 Contact us now for advice on the right solution for your system!