“…Mathematical spectrophotometric methods using built in spectrophotometer's software are now being utilized more frequently for evaluation of drugs in pharmaceutical formulations ( Obaydo et al, 2021 ; Lotfy and Saleh, 2016 ; Saleh et al, 2022 ; Rostom et al, 2021 , 2022 ; Lotfy and Hagazy, 2012 ; Lotfy and Omran, 2018 ; Lotfy et al, 2014 , 2019 , 2020a , 2020b , 2020c , 2021 , 2022 ; Ahmed and Lotfy, 2021 , 2022 ; Samir et al, 2014 ; Obaydo and Sakur, 2019 ; Obaydo and Alhaj Sakur, 2019 ; Al Zakri et al, 2019 ; Darweish et al, 2022 ) as well as the recently developed approaches based on absorptivity centering ( Lotfy et al, 2020a , 2020c ; Lotfy and Omran, 2018 ; Obaydo et al, 2021 ) owing to their inherent benefits such as simplicity, accuracy, reduction of expensive reagents consumption and eschewing time consuming or special software utilization.…”