Establishment of bacterial endotoxin detection method for PBMC suspension
Objective:To establish a method for the quantitative detection of bacterial endotoxins in human pe-ripheral blood mononuclear cell(PBMC)suspensions and to validate the feasibility of the detection method.Methods:According to the standards for photometric determination of bacterial endotoxin in General Notice 1143 of Chinese Pharmacopoeia(ChP)part Ⅲ(2020 edition)and 1085 of USP.A preliminary detection method of bacterial endotoxin content in PBMC suspension was established from standard curve reliability verification and primary interferential screening test.Bacterial endotoxins in three batches of PBMC suspensions were quantitative-ly detected by this method.Results:In the establishment of standard curve and reliability verification test,the linear regression equation was lgt=2.910 9-0.300 1lgC,r=-0.999 8,negative control t＞3 600 s,repeated reaction tube RSDs were less than 3％,the standard curve was established successfully.The results of the primary interferential screening test showed that the PBMC suspension had interference on limulus test at the dilution ratio of 10 and the recovery rate was close to 100％at the dilution ratio of 80,indicating that 80-fold was the best interference dilution ratio without interference.The results of the three batches of samples showed that the endo-toxin contents were all less than 1.0 EU·mL-1 at the dilution ratio of 80,and the RSDs were less than 10％.The positive recoveries were 80.8％-100.3％,which complied with ChP 2020.Conclusion:This method can quickly and quantitatively detect the content of endotoxin in PBMC suspension.
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