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  • 한국과학기술정보연구원(KISTI) 서울분원 대회의실(별관 3층)
  • 2024년 07월 03일(수) 13:30
 

  • P-ISSN1225-0163
  • E-ISSN2288-8985
  • SCOPUS, ESCI, KCI

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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

Structural evaluation of degradation products of Loteprednol using LC-MS/MS: Development of an HPLC method for analyzing process-related impurities of Loteprednol

분석과학 / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2024, v.37 no.2, pp.98-113
https://doi.org/10.5806/AST.2024.37.2.98
Rajesh Varma Bhupatiraju (Department of Chemistry, GITAM Institute of Science, GITAM (Deemed to be University), Visakhapatnam – 530 045, India)
Bikshal Babu Kasimala (Department of Chemistry, Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur – 522 302, A.P., India)
Lavanya Nagamalla (Department of Chemistry, Hyderabad Institute of Technology and Management, Hyderabad – 502 401, Telangana, India)
Fathima Sayed (Department of Chemistry, Hindu College, Guntur –522 003, A.P., India)
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Abstract

The current investigation entails the characterization of five degradation products (DPs) formed under different stress conditions of loteprednol using liquid chromatography–tandem mass spectrometry (LC-MS/ MS). In addition, this study developed a stable high-performance liquid chromatography (HPLC) method for evaluating loteprednol along with impurities. The method conditions were meticulously fine-tuned which involved the exploration of the appropriate solvent, pH, flow of the mobile phase, columns, and wavelength. The method conditions were carefully chosen to successfully resolve the impurities of loteprednol and were employed in subsequent validation procedures. The stability profile of loteprednol was exposed to stress degradation experiments conducted under five conditions, and DPs were structurally characterized by employing LC-MS/MS. The chromatographic resolution of loteprednol and its impurities along with DPs was effectively achieved using a Phenomenex Luna 250 mm C18 column using 0.1 % phosphoric acid, methanol, and acetonitrile in 45:25:30 (v/v) pumped isocratically at 0.8 mL/min with 243 nm wavelength. The method produces an accurate fit calibration curve in 50-300 μg/mL for loteprednol and LOQ (0.05 μg/mL) – 0.30 μg/mL for its impurities with acceptable precision, accuracy, and recovery. The stress-induced degradation study revealed the degradation of loteprednol under basic, acidic, and photolytic conditions, resulting in the formation of seven distinct DPs. The efficacy of this method was validated through LCMS/ MS, which allowed for the verification of the chemical structures of the newly generated DPs of loteprednol. This method was appropriate for assessing the impurities of loteprednol and can also be appropriate for structural and quantitative assessment of its degradation products.

keywords
loteprednol, stress degradation products, characterization, impurity analysis


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