Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Al-Azhar University, Assiut, Egypt;
Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Assiut University, Assiut, Egypt;
Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Minia University, Minia, Egypt;
Pharmaceutical Chemistry Department, Faculty of Pharmacy, King Abdulaziz University, Jeddah, KSA;
Spectrophotometric; Method; 1; 4-DHP; Validated; Selective; Vanillin; Reagent;