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Assessment of the impact of different SARS-CoV-2 inactivation operations on colistin sulfate plasma concentration results

Ma Ying-Chao,Yang Xiu-Ling,Gu Jian-Jun

ObjectiveTo evaluate the effects of different SARS-CoV-2 inactivation methods on the blood concentration of colistin sulfate.Methods A colistin sulfate reference substance, a quality control plasma sample, and a clinically measured sample were transferred and heated in a 56 °C water batch for 30 min or irradiated under an ultraviolet (UV) lamp for 60 min to examine the stability of the reference solution and quality control plasma sample. Statistical analysis was conducted for the concentration of the clinically measured sample before and after inactivation with the intraclass correlation coefficient (ICC) method, the Passing–Bablok regression, and the Bland–Altman analysis.Results The reference substance of colistin sulfate was unstable under UV inactivation. Under moist heat inactivation, the reference substance and quality control plasma sample of colistin sulfate were stable. The ICC of the concentration results of 27 clinical blood samples with and without moist heat inactivation was 0.995 (P < 0.001). The Passing–Bablok regression equation was Y = 0.01347 + 0.9861X (R2 = 0.994, n = 27). Finally, 96.30% (26/27) of test data was within the 95% limit of agreement. The results obtained with the three statistical analysis methods all showed a high correlation and agreement between the plasma concentration results of samples not inactivated and inactivated with moist heat inactivation.Conclusion The clinical plasma concentration test samples for colistin sulfate can be processed with the moist heat virus inactivation method to reduce the risk of virus infection of medical staff.