HU Wei-qi,LIU Qiu-fen,DING Ya,et al.Determination of Nirmatrelvir by Quantitative Nuclear Magnetic Resonance[J].Journal of Instrumental Analysis,2023,42(07):876-881.
HU Wei-qi,LIU Qiu-fen,DING Ya,et al.Determination of Nirmatrelvir by Quantitative Nuclear Magnetic Resonance[J].Journal of Instrumental Analysis,2023,42(07):876-881. DOI: 10.19969/j.fxcsxb.23022706.
Determination of Nirmatrelvir by Quantitative Nuclear Magnetic Resonance
A quantitative nuclear magnetic resonance(,1,H qNMR) method was developed for the determination of the absolute content of nirmatrelvir API.Based on the conformationally stable conditions of nemativir in solution,the proton signals at ,δ,4.96(1H,dd),,δ,4.67(1H,dd) and ,δ,6.22(1H,t),,δ,5.84(1H,d) were selected as the quantitative peaks for nirmatrelvir and lamivudine respectively in DMSO-D,6, and D,2,O(5∶1,by volume) solvents on BRUKER AV-500 NMR instrument.The qNMR method exhibited a high specificity,and an linear fitting equation ,Y ,= 0.456 4,X ,- 0.000 5(,r,2, = 0.999 9) was obtained in the range of 0.5∶1.0-1.2∶1.0 for the molar ratio of sample to internal standard,and the results showed good durability,reproducibility,recovery and 48-hour stability.The content of nirmatrelvir was determined to be 99.23%(RSD = 0.24%) by qNMR.The ,1,H qNMR method is simple,non-destructive,accurate and rapid,which is suitable for determination on the absolute content of nirmatrelvir API.
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