1. Academic Validation
  2. Innovative use of σ and π electron acceptors in the development of three high throughput 96-microwell spectrophotometric assays for crizotinib

Innovative use of σ and π electron acceptors in the development of three high throughput 96-microwell spectrophotometric assays for crizotinib

  • Spectrochim Acta A Mol Biomol Spectrosc. 2021 Oct 5;259:119884. doi: 10.1016/j.saa.2021.119884.
Ibrahim A Darwish 1 Nourah Z Alzoman 2 Jamilah M Alshehri 2 Hany W Darwish 3 Mohammed A Hamidaddin 4 Ahmed Y Sayed 2
Affiliations

Affiliations

  • 1 Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia. Electronic address: idarwish@ksu.edu.sa.
  • 2 Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia.
  • 3 Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia; Department of Analytical Chemistry, Faculty of Pharmacy, Cairo University, Kasr El-Aini St., Cairo 11562, Egypt. Electronic address: hdarwish@ksu.edu.sa.
  • 4 Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia; Department of Medicinal and Analytical Chemistry, Faculty of Pharmacy, Sana's University, Sana's, Yemen.
Abstract

Crizotinib (CZT) is a potent and selective tyrosine kinase inhibitor used for treatment of non-small cell lung Cancer (NSCLC). The development of high-throughput assays for its quality control (QC) is very essential to assure its therapeutic benefits. CZT molecule has multiple electron-donating atoms that can contribute to the formation of colored charge-transfer (CT) complex with iodine as σ-electron acceptor and with 2,5-dichloro-3,6-dihydroxy-1,4-benzoquinone (CHBQ) and 7,7,8,8-tetracyanoquinodimethane (TCNQ) as π-electron acceptors. These reactions were prospective basis for development of three innovative 96-microwell-based spectrophotometric assays for CZT. The reactions of CZT with iodine, CHBQ and TCNQ were performed in 96-microwell assay plates and absorbances of the CT complexes were measured by microwell absorbance reader at their corresponding maximum absorption peaks. The measured absorbances were correlated with the CZT concentrations in its sample solutions. Beer's law was obeyed with excellent correlation coefficients in the range of 0.5-30, 2-500, and 5-500 µg mL-1 for assays using iodine, CHBQ and TCNQ, respectively. The limits of detection were 2.17, 0.85 and 6.23 µg mL-1 for assays using iodine, CHBQ and TCNQ, respectively. The validation studies confirmed the accuracy and precision of all the proposed assays. The assays were successfully applied in the determination of CZT in Xalkori capsules. The proposed assays have very simple procedures to run in QC laboratories. Also, both assays enable analyst to process large number of samples and use of very small volumes of the organic solvent (ecofriendly and inexpensive).

Keywords

2,5-Dichloro-3,6-dihydroxy-1,4-benzoquinone; 7,7,8,8-tetracyanoquinodimethane; Charge-transfer reaction; Crizotinib; High throughput analysis; Iodine; Microwell assay; Spectrophotometry.

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