Abstract
Background: Simple, sensitive, and economic colorimetric device based on a smartphone
digital image coupled with Color Grab™ application was developed for DCH drug determination.
The method is based on the diazotization reaction of benzocaine with DCH drug to get an orange azo
dye.
Methods: Variable parameters such as volumes of reagents, the internal walls and ambient light have
been analyzed and optimized. From the optimized conditions, a calibration curve was created by the
effective intensity (IG) of an orange azo dye, a correlation of determination is 0.999 and limit of detection
0.808 mg/L.
Results: The results of the Smartphone method were statistically compared with the reference method
using a t-test and found to be a good agreement.
Conclusion: This method requires neither solvent extraction and temperature control, also it has
achieved an extensive linear range and low limit of detection compared with different methods reported
in the literature.
Keywords:
Color grab, colorimetric analysis, DCH, digital image, RGB, smartphone.
Graphical Abstract
[7]
Aziz, A.T.; Sultan, S. H. Spectrophotometric determination of mesalazine in pharmaceutical preparations by diazotization and coupling with 2, 6-Dihydroxytoluene as a new coupling agent. Raf. J. Sci., 2019, 47-55.
[10]
Gajda, A.; Posyniak, A.; Pietruszka, K. Analytical procedure for the determination of doxycycline residues in animal tissues by liquid chromatography. Bull. Vet. Inst. Pulawy, 2008, 52, 417-420.
[14]
Kogawa, A.C.; de Mello, N.; Salgado, H.R. Quantification of doxycycline in raw material by an eco-friendly method of infrared spectroscopy. Pharm. Anal. Acta, 2016, 7(2), 463-466.
[20]
Al-Abachi, M.Q.; Al-Nedawi, Z.A. Batch and flow injection spectrophotometric determination of doxycycline hyclate in pharmaceutical preparations. Al-Nahrain J. Sci., 2015, 18(3), 24-32.
[25]
Ramesh, P.J.; Basavaiah, K.; Tharpa, K.; Vinay, K.B.; Revanasiddappa, H.D. Development and validation of RP-HPLC method for the determination of doxycycline hyclate in spiked human urine and pharmaceuticals. J. Pre-Clin. Clin. Res., 2010, 4(2), 101-107.