Food Taint and Off-Odour Recalls: How Sensory Defects Become Withdrawals in the US and EU

What is food taint?

Food taint is an unpleasant odour or flavour that is foreign to the product and enters it from outside: from packaging, pallets, cleaning chemicals, fuel or the storage environment. An off-flavour is broader and also covers defects that form inside the food itself, such as oxidised fat or microbial spoilage. ISO 5492 sets out the standard sensory vocabulary for both terms^[7].

The distinction matters because the investigation starts in a different place. A taint points outward to a material or environment; an off-flavour may point to the recipe, process or shelf life. Some tainting compounds are detectable at parts-per-trillion levels: a musty note from 2,4,6-tribromoanisole (TBA) was perceptible in wine at 4 ng/L^[8]. So a defect can reach the shelf before any routine analytical test would flag it.

Taint is not only a quality problem. In the US, food is adulterated if it consists in whole or in part of a filthy, putrid or decomposed substance, is otherwise unfit for food, or was held under insanitary conditions that may have contaminated it^[2]. In the EU, food that is unfit for human consumption, including through contamination or deterioration, is classed as unsafe and must not be placed on the market^[1].

Common sources: packaging, cleaning and storage

• Packaging: printing inks, adhesives, lacquers, films with residual solvent, and board or wood treated with halophenol preservatives.
• Cleaning and maintenance: residues of chlorinated or fragranced cleaning agents, lubricants, paint and floor sealants.
• Storage and transport: food stored beside strong-smelling goods, fuel or exhaust fumes, and damp warehouses or containers with treated timber.

TCA, TBA and other musty haloanisoles

The best-known taints are the haloanisoles. 2,4,6-trichloroanisole (TCA), the cause of cork taint in wine, and its bromine analogue TBA give musty, mouldy or earthy notes. Both form when moulds and bacteria O-methylate halophenols (chlorophenols or bromophenols) used, or once used, as wood and board preservatives and fungicides^[8][10]. Researchers identified TBA as a potential cause of mustiness in packaged food as early as 1997^[9].

The source is often outside the plant. Chatonnet and colleagues traced TBA cases to recently treated wood, older structural timbers and used wooden containers, and found that residues adsorbed on walls could keep a store contaminated after the original source was removed^[8]. For a food business this has two practical consequences: a pattern of complaints across several batches points to a shared material, pallet or store rather than one production run, and removing a single pallet may not end the problem.

From sensory complaint to recall decision

Detection usually starts with a release check or a consumer complaint. The team then confirms the defect, traces the source, defines the affected lots and answers one question: is the food unsafe, unfit or simply below specification? Four points shape the decision:

• Hazard: could the tainting substance or its source harm health, or does it signal wider contamination?
• Scope: how many lots, packaging deliveries and markets are affected?
• Strength: how strong is the defect against a retained control sample, and would consumers reject the product?
• Reach: has the product left your control, and has it reached consumers?

Retained samples and a coded difference test against a known-good control answer the strength and scope questions; analytical work answers the hazard question. Panel bias and context can distort a confirmation test, so blind coding and balanced presentation matter (see FRL’s guide to challenges in sensory evaluation of food). How to set up that confirmation test is covered in our pillar guide to designing a sensory study.

How US recalls and market withdrawals work (FDA and USDA-FSIS)

Most US food recalls are carried out by the firm. Under 21 CFR Part 7, a recall is a firm’s removal or correction of a marketed product that FDA considers violative and against which it would take legal action; a market withdrawal covers a minor violation that would not be subject to FDA legal action, or no violation at all^[3]. FDA scientists carry out a health hazard evaluation and FDA assigns the class^[3]:

• Class I: reasonable probability of serious adverse health consequences or death.
• Class II: temporary or medically reversible effects, or a remote probability of serious ones.
• Class III: exposure is not likely to cause adverse health consequences.

A taint with no health hazard therefore usually sits in Class III or, if the defect is minor and not a violation, a market withdrawal. A taint that makes food unfit for food, or that points to insanitary storage, can still be a violation even without a health risk^[2]. The recall strategy also sets the depth of the recall: consumer, retail or wholesale level^[3].

Meat, poultry and egg products regulated by USDA’s Food Safety and Inspection Service follow FSIS Directive 8080.1, which uses the same three classes and also allows public health alerts^[4]. For a recent FDA example with a clear health hazard, see our analysis of undeclared allergen recalls.

How the EU handles taint: withdrawal, recall and RASFF

Under Regulation (EC) No 178/2002, food is unsafe if it is injurious to health or unfit for human consumption, and unfitness includes contamination and deterioration that make it unacceptable for its intended use (Article 14)^[1]. If an operator considers or has reason to believe that food it has placed on the market does not meet these requirements, it must immediately start withdrawing it, inform the competent authorities and, where the food may have reached consumers, inform them and recall it if other measures are not enough (Article 19)^[1].

The Rapid Alert System for Food and Feed (RASFF) links national authorities and the Commission. Members notify the system when they have information about a serious direct or indirect risk to human health (Article 50)^[1][5]. Implementing Regulation (EU) 2019/1715 sets the notification types (alert, information and border rejection notifications, plus news) and the deadlines: an alert notification must reach the Commission within 48 hours of the risk being reported, and the Commission passes it on within 24 hours^[6]. A purely sensory taint with no health risk is normally handled nationally as a withdrawal, not as a RASFF alert.

Table 1. Food taint recall routes in the US and EU compared

Preventing taint before it reaches the shelf

• Specify packaging and pallets: ask suppliers to confirm that board, wood and pallets are free of halophenol preservatives, and include an odour check in packaging approval.
• Screen incoming materials: a quick odour check of each new packaging or ingredient delivery against an approved reference catches many problems at goods-in.
• Control cleaning and maintenance chemicals: use food-safe, low-odour products and keep paints, sealants and fuels away from open product and packaging.
• Segregate storage: keep food and packaging away from strong-smelling goods, damp areas and newly treated timber.
• Check at release and keep retained samples of every finished lot and every packaging lot.

Supplier approval is where most taint is prevented; our supplier qualification protocol for spices shows how to build a material-specific check into approval. If a taint develops over time rather than arriving with a material, a real-time or accelerated shelf-life study with sensory end-points will show when it appears.

What to do when a taint issue is found

1. Hold the suspect lots and stop further dispatch.
2. Log every consumer complaint with lot code, purchase location and description of the odour.
3. Confirm the defect with a coded difference test against a retained control, then characterise it.
4. Trace the source through packaging, pallet, ingredient and storage records, and confirm suspected compounds analytically.
5. Decide on hold, withdrawal or recall with regulatory advice, using the US or EU route for each market where the product is sold.

A minimum investigation record should hold:

• Coded sensory results comparing suspect and control samples, with the test method and number of assessors.
• Analytical confirmation where a source compound is suspected.
• Lot, supplier, pallet and distribution traceability.
• The written decision, its rationale and any contact with regulators.

Precise evidence keeps the action narrow. When the source of a problem is misidentified, recalls can spread to unaffected lots and products; an expert elicitation for FDA estimated median spillover costs per producer of $3.0 million to $72.7 million for overly broad recalls following an FDA advisory^[11]. For a spoilage case where root cause shaped the response, see our analysis of the Slimsy squash recall.

Conclusion

Food taint is a sensory defect that can become a legal one. In the US, food that is unfit for food is adulterated; in the EU, unfit food is unsafe food. Early sensory detection, a documented root cause and the right route for each market keep the response proportionate, and supplier, pallet and storage controls stop the taint coming back.

For brands & formulators

Food Research Lab, based in Chennai, India, supports US and EU brands with taint and off-flavour investigations. Our sensory research and analytics team designs the confirmation tests, builds a descriptive lexicon for the defect and interprets the results; panel testing and instrumental analysis such as GC-MS are run in-house or arranged through accredited partner laboratories. Our regulatory and scientific research team helps you document the decision for the US or EU route, and new food product development builds supplier and packaging controls into new products.

Contact us with the product, the complaint pattern and your retained samples.

In this series

• Flavour trends 2026: swicy and the flavour directions US and EU shoppers are buying.
• Natural flavour labelling: FDA vs EU: how the two systems define and label natural flavourings.
• Off-odour and taint recalls: how food taint becomes a withdrawal or recall in the US and EU (you are here).
• Designing a sensory study: tests, panels and statistics that hold up (cluster guide).
• Flavour validation with sensory panels: a worked example from brief to decision.
• Sensory testing regulations in the US and EU: common questions answered.
• Sensory research and analytics: FRL’s sensory service for product teams.

1. European Parliament & Council of the European Union. (2002). Regulation (EC) No 178/2002 laying down the general principles and requirements of food law (Articles 14, 19 and 50). EUR-Lex. https://eur-lex.europa.eu/eli/reg/2002/178/oj (cited for unsafe and unfit food, operator withdrawal, recall and notification duties, and the rapid alert system)
2. United States Code. (2024). 21 U.S.C. § 342: Adulterated food (FD&C Act § 402(a)(3)–(4)). Legal Information Institute, Cornell Law School. https://www.law.cornell.edu/uscode/text/21/342 (cited for food that is otherwise unfit for food or held under insanitary conditions being adulterated)
3. U.S. Food and Drug Administration. (2026). 21 CFR Part 7, Subpart C: Recalls (including product corrections) (§§ 7.3, 7.41, 7.42). Electronic Code of Federal Regulations. https://www.ecfr.gov/current/title-21/chapter-I/subchapter-A/part-7 (cited for recall and market withdrawal definitions, health hazard evaluation, Class I to III and depth of recall)
4. U.S. Department of Agriculture, Food Safety and Inspection Service. (2023). FSIS Directive 8080.1, Revision 8: Recall of meat, poultry and egg products. https://www.fsis.usda.gov/policy/fsis-directives/8080.1 (cited for the FSIS recall route, its three classes and public health alerts, and the inclusion of egg products)
5. European Commission. (n.d.). RASFF: Food and feed safety alerts. https://food.ec.europa.eu/food-safety/rasff_en (cited for the purpose and operation of RASFF)
6. European Commission. (2019). Commission Implementing Regulation (EU) 2019/1715 laying down rules for the functioning of the information management system for official controls (IMSOC) (Articles 2 and 17). EUR-Lex. https://eur-lex.europa.eu/eli/reg_impl/2019/1715/oj (cited for RASFF notification types and the 48-hour and 24-hour alert deadlines)
7. International Organization for Standardization. (2008). ISO 5492:2008 Sensory analysis: Vocabulary (amended 2016). https://www.iso.org/standard/38051.html (cited for standard sensory terminology, including taint and off-flavour)
8. Chatonnet, P., Bonnet, S., Boutou, S., & Labadie, M.-D. (2004). Identification and responsibility of 2,4,6-tribromoanisole in musty, corked odors in wine. Journal of Agricultural and Food Chemistry, 52(5), 1255–1262. https://doi.org/10.1021/jf030632f (cited for the 4 ng/L perception level, O-methylation of tribromophenol and treated-wood and building sources)
9. Whitfield, F. B., Hill, J. L., & Shaw, K. J. (1997). 2,4,6-Tribromoanisole: A potential cause of mustiness in packaged food. Journal of Agricultural and Food Chemistry, 45(3), 889–893. https://doi.org/10.1021/jf960587u (cited for TBA as a cause of mustiness in packaged food)
10. Callejón, R. M., Ubeda, C., Ríos-Reina, R., Morales, M. L., & Troncoso, A. M. (2016). Recent developments in the analysis of musty odour compounds in water and wine: A review. Journal of Chromatography A, 1428, 72–85. https://doi.org/10.1016/j.chroma.2015.09.008 (cited for haloanisoles such as TCA as musty odour compounds and their analysis)
11. Ackerley, N., Berlind, A., Black, M., Kho, K., McLaughlin, C., Sassi, A., Sertkaya, A., & Walker, S. (2025). Costs of overly broad recalls. Journal of Food Protection, 88(3), 100450. https://doi.org/10.1016/j.jfp.2025.100450 (cited for median per-firm spillover costs of overly broad recalls)