Hishar Hassan
◽
Muhammad Faiz Othman
◽
Zainul Amiruddin Zakaria
◽
Fathinul Fikri Ahmad Saad
◽
Hairil Rashmizal Abdul Razak
Background::
Organic solvents play an indispensable role in most of the radiopharmaceutical production stages. It is almost impossible to remove them entirely in the final formulation of the product.
Objective::
In this presented work, an analytical method by gas chromatography coupled with flame ionization detection (GC-FID) has been developed to determine organic solvents in radiopharmaceutical samples. The effect of injection hold time, temperature variation in the injection port, and the column temperature on the analysis time and resolution (R ≥ 1.5) of ethanol and acetonitrile were studied extensively.
Methods::
The experimental conditions were optimized with the aid of further statistical analysis; thence, the proposed method was validated following the International Council for Harmonisation (ICH) Q2 (R1) guideline.
Results::
The proposed analytical method surpassed the acceptance criteria for the linearity > 0.990 (correlation coefficient of R2), precision < 2%, LOD, and LOQ, accuracy > 90% for all solvents. The separation between ethanol and acetonitrile was acceptable with a resolution, R > 1.5. Further statistical analysis of Oneway ANOVA revealed that the increment of injection holds time and variation of temperature at the injection port did not significantly affect the analysis time. Nevertheless, the variation of injection port temperature substantially influences the resolution of ethanol and acetonitrile peaks (p < 0.05).
Conclusion::
The proposed analytical method has been successfully implemented to determine the organic solvent in the [18F]fluoro-ethyl-tyrosine ([18F]FET), [18F]fluoromisonidazole ([18F]FMISO), and [18F]fluorothymidine ([18F]FLT).