1. Laboratory of Biophysics Wageningen University and Research Stippeneng 4 Wageningen 6708 WE The Netherlands
2. Laboratory of Biochemistry Wageningen University and Research Stippeneng 4 Wageningen 6708 WE The Netherlands
3. Groningen Research Institute of Pharmacy Pharmaceutical Analysis University of Groningen P.O. Box 196 9700 AD Groningen The Netherlands
4. Stichting Imec Nederland within OnePlanet Research Center Bronland 10 Wageningen 6708 WH The Netherlands
5. Microspectroscopy Research Facility Wageningen University and Research Stippeneng 4 Wageningen 6708 WE The Netherlands