1. Department of Chemistry, University of Dschang, Dschang, Cameroon
2. Department of Biochemistry, University of Dschang, Dschang, Cameroon
3. Department of Biochemistry, University of Yaoundé, Yaoundé I, Cameroon
4. Department of Chemistry, Faculty of Science, Eskisehir Technical University, Eskisehir, Turkey
5. Doping and Narcotic Compounds Analysis Laboratory, Faculty of Pharmacy, Anadolu University, Eskisehir, Turkey