Expert problem solving
Our investigation began with an informal sensory analysis which described the taint as a strong petroleum-like odour.
Based on this profile, we used a solid phase microextraction chromatography linked mass spectrometry technique (SPME GC-MS) to compare the tainted product with a control sample. This analysis enabled us to identify the components attributed to the taint as aliphatic hydrocarbons.
We then turned to the question of where this specific taint could have come from. By tracing the product through the manufacturing process and supply chain, we discovered that the product was stored under containers of white spirit in the retailer’s warehouse. This suggested that there had been a transfer of white spirit to the savoury sauce product, which we subsequently confirmed through further analysis.
Using this information to quantify the amount of white spirit in the tainted product and carry out a toxicology risk assessment, we concluded that the risk to public health was minimal.