Characterization and chemistry of imidazolidinyl urea and diazolidinyl urea

  title={Characterization and chemistry of imidazolidinyl urea and diazolidinyl urea},
  author={S{\o}ren Vig Lehmann and Ulla Hoeck and Jens Breinholdt and Carl Erik Olsen and Bo Kreilgaard},
  journal={Contact Dermatitis},
For several decades, the cosmetic preservatives imidazolidinyl urea (IU) and diazolidinyl urea (DU) have not only been poorly characterized but have also had misleading chemical structures assigned to them. The most common trade names of IU and DU are Germall 115 and Germall II, respectively. This publication gives an insight into what these 2 well‐known contact allergens consist of and their degradation patterns. Approximately, 30–40% of both products can be characterized by mixtures of… 

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Determination of diazolidinyl urea in cosmetic formulations by capillary electrophoresis

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Introducing concentrated solutions of preservatives (CSP) provides a methodology both for the use of preservative systems and for their routine control in cosmetic products.