Shahzeb Ahmad,
Ankita Shukla,
Bala Subramanyam,
- Research Scholar, Department of Pharmacy, Millennium College of Pharmacy, Bhopal, Madhya Pradesh, India
- Professor, Department of Pharmacy, Millennium College of Pharmacy, Bhopal, Madhya Pradesh, India
- Professor, Department of Pharmacy, Millennium College of Pharmacy, Bhopal, Madhya Pradesh, India
Abstract
A rapid, sensitive, and highly selective UPLC-MS/MS method was developed and validated for the quantitative estimation of Levothyroxine in human plasma using Levothyroxine-D₃ as the internal standard (IS). Chromatographic separation was achieved on a Gemini NX-C18 column (50 × 3.0 mm, 3 µm) with a mobile phase consisting of acetonitrile and water (70:30, v/v) containing 0.015% formic acid at a flow rate of 0.5 mL/min. The total run time was 0.9 minutes per sample. Detection was carried out in positive electrospray ionization mode using multiple reaction monitoring (MRM) with transitions m/z 777.60→731.65 for Levothyroxine and m/z 780.70→734.60 for the IS. The method was validated over a linear range of 0.5–2000 ng/mL, with correlation coefficients (r²) consistently greater than 0.998. Intra- and inter-day precision (%CV) and accuracy values were within the acceptable limits of ±15% as per USFDA and ICH M10 guidelines. High and consistent recoveries were obtained using solid-phase extraction (SPE), with negligible matrix effects across six plasma lots. The analyte exhibited acceptable stability under all tested conditions including freeze–thaw, bench-top, autosampler, and long-term storage. Dilution integrity and system suitability parameters confirmed the robustness and reliability of the method. The validated method is simple, reproducible, and suitable for high-throughput analysis of Levothyroxine in clinical and pharmacokinetic studies, making it a strong candidate for application in therapeutic drug monitoring and bioequivalence evaluations.
Keywords: Levothyroxine, UPLC-MS/MS, Bioanalytical Method Validation, Human Plasma, ICH M10, USFDA, SPE Extraction, Pharmacokinetics
Shahzeb Ahmad, Ankita Shukla, Bala Subramanyam. Bioanalytical Method Development and Validation for the Estimation of Levothyroxine in Human K₃EDTA Plasma by Using UPLC-MS/MS. Research & Reviews: A Journal of Drug Formulation, Development and Production. 2025; 12(03):-.
Shahzeb Ahmad, Ankita Shukla, Bala Subramanyam. Bioanalytical Method Development and Validation for the Estimation of Levothyroxine in Human K₃EDTA Plasma by Using UPLC-MS/MS. Research & Reviews: A Journal of Drug Formulation, Development and Production. 2025; 12(03):-. Available from: https://journals.stmjournals.com/rrjodfdp/article=2025/view=223210
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| Volume | 12 |
| 03 | |
| Received | 19/07/2025 |
| Accepted | 29/07/2025 |
| Published | 13/08/2025 |
| Publication Time | 25 Days |
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