1. Department
of Analytical Chemistry; Reference Materials, BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str.
11, D-12489 Berlin, Germany
2. Department
of Organic Chemistry, University Autónoma of Madrid, Cantoblanco, 28049 Madrid, Spain
3. Branch
Bioanalytics and Bioprocesses, IZI-BB Fraunhofer Institute for Cell Therapy and Immunology, Am Mühlenberg 11, D-14476 Potsdam, Germany
4. Faculty
of Sciences, Department of Organic and Macromolecular Chemistry, Organic
and Biomimetic Chemistry Research Group, Ghent University, Krijgslaan
281 (S4), 9000 Ghent, Belgium
5. IMDEA Nanoscience, c/Faraday,
9, Cantoblanco, 28049 Madrid, Spain