Chemical Research in Chinese Universities ›› 2021, Vol. 37 ›› Issue (3): 629-638.doi: 10.1007/s40242-020-0339-0

• Articles • Previous Articles     Next Articles

Flow Injection Chemiluminescence Method for Nalbuphine Hydrochloride in Pharmaceutical Formulations Using Tris(2,2'-bipyridyl)ruthenium(II) Chloride-diperiodatocuprate(III) Reaction

AHMED Khan, MUHAMMAD Asghar, MOHAMMED Yaqoob, MASOOD Ahmed Siddiqui, SAMAR Ali   

  1. Department of Chemistry, University of Balochistan, Sariab Road, Quetta-87300, Pakistan
  • Received:2020-10-24 Revised:2020-11-08 Online:2021-06-01 Published:2020-11-18
  • Contact: MOHAMMED Yaqoob E-mail:yaqoob2001@hotmail.com
  • Supported by:
    The authors acknowledge the Department of Chemistry, University of Balochistan, Quetta, Pakistan for providing research facilities.

Abstract: Asensitive and selective method employing chemiluminescence(CL) coupled with flow injection(FI) is reported for nalbuphine hydrochloride(NAL) assay in pharmaceutical formulations. The enhancement effect of NAL on the CL reaction between tris(2,2'-bipyridyl)ruthenium(II) chloride-diperiodatocuprate(III) {Ru[(bpy)3]2+-Cu(III) complex} in acidic medium is used as analytical measurement. The optimal conditions of the CL reaction were sulfuric acid 1.0×10-3 mol/L, Ru[(bpy)3]2+ 7.5×10-5 mol/L, Cu(III)/Ag(III) complexes 4.0×10-4/5.0×10-4 mol/L, sample loop volume of 120 μL and flow rate of 2.5 mL/min. The sensitivities of the method in terms of detection(S/N=3) and quantification(S/N=10) limits are 5×10-4 and 0.001 ppm(1 ppm=1 mg/L), respectively. The linear response of the instrument in the form of CL intensity with respect to NAL concentration is over the range 0.001-15.0 ppm(R2=0.9999) with relative standard deviation from 0.8% to 3.2% and injection throughput of 120 injection/h. The applications of the method include the quantitative analysis of NAL in pharmaceutical injection samples. Variations and the average results of the proposed method are not signi-ficantly different from the results of a reported method by applying F- and paired student t-test. The most likely CL reaction mechanism is written in accordance with spectrophotometric and CL studies.

Key words: Ru[(bpy)3]2+, Cu(III)/Ag(III) complex, Chemiluminescence, Flow injection analysis, Nalbuphine hydrochloride, Pharmaceutical