State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources;
Guangxi University;
Nanning;
China;
Zurich University of Applied Sciences;
Institute of Chemistry and Biological Chemistry;
Wädenswil;
Switzerland;
Institute of Pharmacology and Toxicology;
Dept.Biomedical Sciences;
University of Veterinary Medicine;
Vienna;
Austria;
Department of Physics;
Guangxi University;
Nanning;
China;
Coffee; Tea; Free Radicals; Antioxidants; EPR Spectroscopy; Quality;