RT Journal Article T1 Novel gas-diffusion microextraction followed by gas chromatography coupled to tandem mass spectrometry methodology for the determination of fragrance allergens in cosmetic products A1 Castiñeira Landeira, Ana A1 Gómez-Feas, Ángel A1 Carro Díaz, Antonia María A1 Dagnac, Thierry A1 Almeida, Paulo J. A1 Llompart Vizoso, María del Pilar K1 GDME K1 GC–MS/MS K1 Fragrance allergens K1 Cosmetic products K1 Sample preparation K1 Analytical metrics K1 AGREEPrep AB An efficient sample preparation method using gas-diffusion microextraction (GDME) followed by gas chromatography coupled to tandem mass spectrometry (GC-MS/MS) is proposed for the first time to determine fragrance allergens in both aqueous and alcohol-based cosmetic products. The most significant GDME parameters were optimized, starting with extraction temperature as a preliminary experiment. Subsequently, an experimental design was performed to evaluate the influence of six parameters: acceptor solution volume, acetonitrile percentage in the acceptor solution, sample dilution, salting-out effect, extraction time, and sample volume. Under the optimized conditions, the method was validated in terms of linearity, precision, trueness, obtaining a good performance. The validated methodology was applied to twelve real cosmetic samples, demonstrating the widespread occurrence of these allergens in cosmetics. Notably, lilial, a compound prohibited by Regulation EC No 1223/2009, was detected in one cosmetic product (460 μg mL-1); and the concentrations of some of the target fragrance allergens in some samples reach values above 1000 μg mL-1. This methodology represents a sustainable and practical approach, supported by AGREEPrep and BAGI metrics, respectively. PB Elsevier YR 2025 FD 2025 LK https://hdl.handle.net/10347/41684 UL https://hdl.handle.net/10347/41684 LA eng NO Castiñeira-Landeira, A., Gomez-Feas, A., Carro, A. M., Dagnac, T., Almeida, P. J., Llompart, M. (2025). Novel gas-diffusion microextraction followed by gas chromatography coupled to tandem mass spectrometry methodology for the determination of fragrance allergens in cosmetic products. "Advances In Sample Preparation", vol. 14, 00187 NO This research is based on the Sample Preparation Study Group and Network, supported by the Division of Analytical Chemistry of the Eu ropean Chemical Society. Some of the authors are affiliated with the National Network for Sustainable Sample Preparation, RED2022–134079-T (Ministry of Science, Innovation and Universities, Spain). M.L. acknowledges the IUPAC project 2021–015–2–500: Greenness of official standard sample preparation methods DS Minerva RD 24 abr 2026