Products & safety
Patulin: apple spoilage, juice processing, action levels and testing quality
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Patulin is a toxin produced by molds that can grow on apples and contaminate apple juice. The mold is an organism; patulin is a chemical contaminant. Killing microbes does not automatically remove a toxin already in the juice.[1]
Sound fruit is a preventive control
FDA's juice guidance identifies rotten, moldy, bruised, damaged and improperly stored apples as potential sources of elevated patulin. The useful control is preventing spoiled material from entering the process and verifying appropriate sourcing and handling. A juice appearing clear or tasting normal does not provide a toxin measurement. Conversely, the fact that apples can carry patulin does not establish that every apple or every juice contains a dangerous concentration.[1]
Concentrate, single-strength juice and mixed drinks require different interpretation
FDA's compliance guidance applies its action criteria to single-strength apple juice, reconstituted single-strength juice from concentrate, or the single-strength apple-juice component when juice is an ingredient. Concentration before dilution and concentration in the drink actually consumed are different quantities. A supplier result must identify which material was tested. A limit expressed per kilogram juice is not a personal daily dose and cannot be compared directly with a body-weight-based intake value.[2]
Pasteurization and chemical decontamination are distinct
FDA warns that high patulin can remain in pasteurized juice because ordinary thermal processing does not destroy it. Pasteurization addresses microbial hazards under defined conditions; it is not a universal removal step for chemicals formed before heating. Pasteurization does not settle every food-safety question. Preventive sorting and sound fruit remain relevant, and consumers should not treat household boiling as a validated way to rescue spoiled juice.[1]
Evidence & uncertainty
Selected guidance and processing studies distinguish microbial control, toxin reduction and measurement quality. WHO describes genotoxic concern without demonstrated carcinogenic potential. An old paper's broader cancer claim does not override that distinction or establish a personal diagnosis.[3][5]
Selected-source overview · Independent review pendingPublished questions
Does pasteurized mean patulin-free?
Selected-source overview · Independent review pending. Read the evidence context.
No. FDA explains that ordinary thermal processing does not destroy patulin already present. Microbial control and toxin prevention are separate food-safety tasks.[1]
Evidence behind this answer
- Juice HACCP Hazards and Controls Guidance, first edition
agency guidance or assessment · 2004
Original official page and selected relevant passages inspected · Section V chemical hazards, patulin: spoiled apples, pasteurized juice and controls
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Can a concentrate number be compared directly with the juice action level?
Selected-source overview · Independent review pending. Read the evidence context.
The FDA guidance specifies a reconstituted single-strength basis for concentrate. The tested material and dilution basis must be identified.[2]
Evidence behind this answer
- CPG 510.150: Apple Juice Adulteration with Patulin
agency guidance or assessment · 2005
Original official page and selected relevant passages inspected · Regulatory action guidance: 50 μg/kg, sample basis, original/check analysis and confirmation
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Is patulin established as a human carcinogen?
Selected-source overview · Independent review pending. Read the evidence context.
WHO describes genotoxicity but says carcinogenic potential has not been demonstrated. Hazard claims should retain that distinction.[3]
Evidence behind this answer
- Mycotoxins
agency guidance or assessment · 2023
Original official page and selected relevant passages inspected · Patulin paragraph: genotoxic concern versus unproven carcinogenic potential
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Does a filter always remove the same percentage?
Selected-source overview · Independent review pending. Read the evidence context.
No. The pilot-scale study found process- and toxin-specific effects, including limited patulin reduction. One experimental treatment cannot guarantee another process's performance.[6]
Evidence behind this answer
- Processing effects on OTA, patulin and alternariol in apple juices
original pilot scale processing experiment · 2021
Original research abstract and figure design captions inspected; full study not inspected · Original abstract: spiked pilot-scale juices, filtration effects and 20% patulin reduction
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Can clearer juice leave toxin in the removed solids?
Selected-source overview · Independent review pending. Read the evidence context.
Yes. The laboratory clarification study linked reductions to binding in separated solids. A reduced juice result does not show destruction throughout the process.[5]
Evidence behind this answer
- Reduction of patulin during apple juice clarification
original processing experiment · 2001
Original research abstract inspected; full paper not inspected · Abstract methods/results: spiked pulp, clarification and transfer to solids; broad cancer assertion not adopted
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Does nondetect establish exact zero?
Selected-source overview · Independent review pending. Read the evidence context.
No. Detection depends on the method and matrix. The collaborative validation study illustrates recovery and reproducibility limits that affect analytical interpretation.[7]
Evidence behind this answer
- LC determination of patulin in clear/cloudy juice and puree: collaborative study
original collaborative method validation · 2000
Original method-validation abstract inspected; not a current assay certification · Abstract: 14 collaborators, matrices, recoveries and reproducibility
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
The tolerable value concerns repeated exposure
JECFA's database records a provisional maximum tolerable daily intake of 0.4 micrograms per kilogram body weight per day, established in 1995 using an animal no-effect level and a safety factor. It changed an earlier weekly value to a daily framework based on the toxin's behavior and consumption pattern. This is a historical health-based assessment, not an individual poisoning threshold. An intake estimate requires juice consumption, concentration and body weight; young children drinking the same volume as adults can have higher exposure per kilogram.[4]
The US action level includes analytical confirmation
FDA's posted compliance policy describes action consideration when original and check analyses show at least 50 micrograms per kilogram, or 50 parts per billion, on the specified juice basis and identity is confirmed by the stated method. It is guidance describing enforcement thinking, not a certificate for every serving below the number. Sampling, measurement uncertainty and the applicable food basis matter. A dilution calculation alone should not substitute for appropriate contamination prevention.[2]
Clarification can transfer toxin into another fraction
A 2001 laboratory study spiked apple pulp and compared clarification methods, reporting substantial reductions in the resulting juice. It linked reduction to binding to solid substrates and measured the separated pulp, pellets or filter material. Lower concentration in the juice therefore did not imply that toxin had disappeared from the entire process. These specific laboratory conditions should not be rewritten as a household treatment recommendation or proof that every commercial clarification line produces the same reduction.[5]
Later pilot-scale results show why conditions matter
A 2021 pilot-scale study spiked raw juice and tested clear and cloudy production steps. Common processing steps did not reliably eliminate patulin. In one clear-juice treatment, activated charcoal/bentonite and ultrafiltration reduced patulin only 20 percent, while other tested toxins responded differently; cloudy-juice processing was ineffective in that experiment. Differences from earlier clarification results may involve starting material and specific operations. A reduction percentage is process-specific, not a universal property of filtration or proof of safety after a treatment.[6]
Reliable numbers need a method suited to the sample
An original collaborative validation study sent clear juice, cloudy juice and puree samples to 14 collaborators in 12 European countries. Recoveries ranged from 80 to 92 percent, and precision differed across conditions. This illustrates why the sample matrix, recovery and reproducibility belong with a result. A nondetect means below the method's relevant detection capability, rather than absolute chemical absence. A claim of tested purity should identify the lot, method, reporting limit and which juice form was sampled.[7]
References
- Juice HACCP Hazards and Controls Guidance, first edition
Agency guidance or assessment
US FDA · Content/publication date: 2004
Accessed: 2026-10-13 UTC · Original official page and selected relevant passages inspected
Cited sections: Section V chemical hazards, patulin: spoiled apples, pasteurized juice and controlsSelected-source access only; check date is distinct from publication date. No independent expert review.
- CPG 510.150: Apple Juice Adulteration with Patulin
Agency guidance or assessment
US FDA · Content/publication date: 2005
Accessed: 2026-10-13 UTC · Original official page and selected relevant passages inspected
Cited sections: Regulatory action guidance: 50 μg/kg, sample basis, original/check analysis and confirmationSelected-source access only; check date is distinct from publication date. No independent expert review.
- Mycotoxins
Agency guidance or assessment
WHO · Content/publication date: 2023
Accessed: 2026-10-13 UTC · Original official page and selected relevant passages inspected
Cited sections: Patulin paragraph: genotoxic concern versus unproven carcinogenic potentialSelected-source access only; check date is distinct from publication date. No independent expert review.
- Patulin: JECFA evaluation database
Agency technical assessment
FAO/WHO JECFA · Content/publication date: 1995
Accessed: 2026-10-13 UTC · Original official page and selected relevant passages inspected
Cited sections: 1995 evaluation: PMTDI 0.4 μg/kg/day, daily versus weekly rationale and animal endpointSelected-source access only; check date is distinct from publication date. No independent expert review.
- Reduction of patulin during apple juice clarification
Original processing experiment
Bissessur et al. · Content/publication date: 2001
Accessed: 2026-10-13 UTC · Original research abstract inspected; full paper not inspected
Cited sections: Abstract methods/results: spiked pulp, clarification and transfer to solids; broad cancer assertion not adoptedSelected-source access only; check date is distinct from publication date. No independent expert review.
- Processing effects on OTA, patulin and alternariol in apple juices
Original pilot scale processing experiment
Aroud et al. · Content/publication date: 2021
Accessed: 2026-10-13 UTC · Original research abstract and figure design captions inspected; full study not inspected
Cited sections: Original abstract: spiked pilot-scale juices, filtration effects and 20% patulin reductionSelected-source access only; check date is distinct from publication date. No independent expert review.
- LC determination of patulin in clear/cloudy juice and puree: collaborative study
Original collaborative method validation
MacDonald et al. · Content/publication date: 2000
Accessed: 2026-10-13 UTC · Original method-validation abstract inspected; not a current assay certification
Cited sections: Abstract: 14 collaborators, matrices, recoveries and reproducibilitySelected-source access only; check date is distinct from publication date. No independent expert review.
Scope & review
- Population
- General readers; food exposure, occupational settings and vulnerable populations are distinguished where relevant
- Exposure or intervention
- Patulin
- Comparison
- Chemical forms, routes, dose and duration; health guidance versus product limits
- Outcomes
- Identity, everyday sources, evidence, practical interpretation and uncertainty
- Timeframe
- Selected sources checked 2026-10-13; historical evidence is dated separately
- Jurisdiction
- US and explicitly identified European or international sources; local rules differ
Bounded selected-source educational explanation. Official assessments, original studies and editorial inference are distinguished. No exhaustive search, independent systematic synthesis or qualified medical review.
Sources checked on their individual access dates. Selected sources were checked; ongoing surveillance and qualified review have separate statuses on the coverage page.
Revision history
- 2026-10-13 UTC: Added definition-first explanation, categories, practical questions and source-linked uncertainty.
What this article still leaves open
- No product-specific safety certificate or individualized exposure diagnosis is provided.
- Jurisdiction-specific implementation, sampling methods and newly published evidence require separate assessment.
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