Method developed for detecting toxic substances
Researchers at the Spain-based Igualada School of Engineering (EEI), a school associated with the Universitat Politècnica de Catalunya (UPC), have developed a new analytical method that improves detection of dimethyl fumarate (DMFu) in leather and footwear.
The use of DMFu in consumer products is prohibited in the European Union as it causes allergic contact dermatitis. The new method is based on detection using the headspace solid-phase micro extraction (HS-SPME) technique. Unlike more widespread methods of sample preparation, HS-SPME obtains samples from the product without damaging it. In addition, it reduces analysis time, minimises chemical use and laboratory waste, and provides greater detection sensitivity, according to the researchers.
The samples in which DMFu is detected are analysed using an acetone extraction method and the substance is determined quantitatively in a gas chromatography system equipped with a mass detector.
In 2009, the European Commission adopted Directive 2009/251, which prohibits the use of DMFu in consumer products. In the absence of an official method of analysis, laboratories in the leather and footwear industries have developed their own techniques to achieve a rapid and efficient analysis. The authorities responsible for consumer safety, including the Catalan Consumer Agency, periodically analyse leather products in the EEI laboratory to ensure products contain no trace of DMFu. The leather manufactured by several tanneries is also monitored in the laboratory.
