Ulrika Nilsson is a Professor at Stockholm University, leading a research group focused on the development of analytical methods and techniques for studying and measuring compounds involved in skin sensitization, particularly in the context of contact allergy. Her work aims to analyze complex dye mixtures in textiles and identify allergens that may cause skin sensitization. Ulrika is particularly interested in the levels of chemicals used in dyes and the identification of specific skin sensitizers, including fragrance hydroperoxides, isothiocyanates, and resin acids derived from colophonium. Her research employs high-sensitivity and high-selectivity methods, such as 2D-reversed phase and normal phase high-performance liquid chromatography coupled with mass spectrometry (HPLC/MS) and solid-phase microextraction gas chromatography coupled with mass spectrometry (SPME/GC/MS), to measure trace amounts of skin sensitizers in complex commercial products and materials. Nilsson collaborates with external members in her research projects, indicating a strong network within the field of analytical chemistry, particularly concerning health and environmental safety.