Katja Quass
Ciba Specialty Chemicals
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Publication
Featured researches published by Katja Quass.
Photochemistry and Photobiology | 2009
Bernd Herzog; Monika Wehrle; Katja Quass
Sunscreens are used to protect the human skin against harmful UV radiation. Today there is a trend toward higher sun protection factors (SPF) and better UVA protection. Methods for the assessment of SPF and UVA protection involve irradiation of the product, and the photostability properties of the sunscreen have an influence on its performance. Sunscreens often contain more than one UV filter. Thus it is important to understand the photostability properties of the complete system. The filter combinations used may exhibit destabilizing, stabilizing or inert interactions. For that reason, besides assessment of the properties of the single filters, photostabilities of binary filter combinations are investigated. Destabilization occurs when two UV absorbers undergo a chemical reaction after absorption of UV radiation. Stabilization may be achieved when the optical density of the system is very high, giving rise to a self‐protection effect of the sunscreen film. Photounstable UV absorbers may be additionally stabilized by employing triplet quenchers. Being aware of these mechanisms and applying them for specific UV filter combinations can help in designing efficient sunscreens.
Journal of Pharmaceutical Sciences | 2004
Bernd Herzog; Sebastien Mongiat; Katja Quass; Cyrille Deshayes
Journal of Colloid and Interface Science | 2004
Bernd Herzog; Armin Katzenstein; Katja Quass; Albert Stehlin; Helmut Luther
Journal of Colloid and Interface Science | 2004
Bernd Herzog; Katja Quass; Erika Schmidt; Stefan Müller; Helmut Luther
Archive | 2008
Bernd Herzog; Katja Quass; Stephanie Acker
Archive | 2006
Stefan Müller; Jochen Giesinger; Thomas Ehlis; Bernd Herzog; Peter König; Gilbert Kreyer; Katja Quass
Archive | 2008
Bernd Herzog; Katja Quass; Stephanie Acker
Archive | 2006
Stefan Mueller; Jochen Giesinger; Thomas Ehlis; Bernd Herzog; Peter Koenig; Gilbert Kreyer; Katja Quass
Archive | 2006
Stefan Mueller; Jochen Giesinger; Thomas Ehlis; Bernd Herzog; Peter Koenig; Gilbert Kreyer; Katja Quass
Archive | 2005
Stefan Müller; Bernd Herzog; Katja Quass