Simple Colourimetric Method and Development of A Colour Kit for on-the-spot Azelnidipine Estimation using A Smartphone Application, with Comparison to the UV-Spectroscopic Method

In the proposed research paper, a simple and accurate colorimetric method has been developed for the estimation of Azelnidipine in bulk. Instead of a traditional UV spectrophotometer, the proposed method measures the colour intensity of a solution using a smartphone camera and an application. This colorimetric method was found to be linear in the concentration range of 2µg/ml to 10µg/ml with an r² value of 0.9993. The limits of detection (LOD) and quantification (LOQ) were found to be 0.024µg/ml and 0.068µg/ml, respectively.