DERIVATIVE SPECTROPHOTOMETRIC DETERMINATION OF QUININE, ADENINE AND METOCLOPRAMIDE HYDROCHLORIDE IN THEIR BINARY MIXTURE USING ZERO-CROSSING TECHNIQUE. - Naggar, Ahmed H.; Alfarsi, Anas; Farghaly, Othman A.; Taher, Mahmoud A.; El-Sayed, Abd El-Aziz Y.; Abdelwahab, Adel A. (Bulletin of the Chemical Society of Ethiopia, 2025)