Objective To perform a methodological evaluation study of 4 HPLC based systems and a capillary electrophoresis based system , with the International Federation of Clinical Chemistry and Laboratory Medicine ( IFCC) glycated hemoglobin reference method as a comparative method .Methods 40 hemolysis samples of variety concentrations were prepared .The samples were measured by IFCC reference method and 5 glycated hemoglobin testing systems , respectively and trueness verification was performed according to the Clinical &Laboratory Standards Institute (CLSI) guideline EP9-A3.Whole blood samples were used to test the systems'precision, linearity and analytical interferences .Results The average CV of IFCC reference method results of 40 hemolysis samples was 1.4％( range from 0.2％to 2.5％).No outlier was found in the results of the 5 testing system.The slopes ranged from 0.9902 to 1.0267, and intercepts from -0.1526 mmol/mol to +0.1512 mmol/mol, squared correlation coefficient from 0.9962-0.9971, biases at two medical decision level were less than 0.3％HbA1c.Within-laboratory precisions were less than 2％ (NGSP unit).Bias between all test results and predicted results were less than 5％.High concentration of glucose showed certain interference to glycated Hemoglobin tests but had little influence in clinical practice.Conclusions The results of the 5 testing system are comparable to the IFCC reference method , the results of precision and linearity evaluation meet the requirements of related guidelines .

Objective:To explore the antagonistic effect of Fengzhecao extract against human red blood cell (RBC) hemolysis induced by wasp venom.Methods:Water extract method was used to extract dried Fengzhecao and vacuum-dried to obtain Fengzhecao extract. It was diluted into 1 g/L for next use. Wasp venom was collected from the wasp workers. A, B, O, AB type healthy blood donors' suspended RBC solution was obtain to make washed RBC solutions and adjust the RBCs count (4.0-80.0)×10 9/L (the number of RBC counted on the hemocytometer is 1-20 cells/small checker). According to treatment factors, they were divided into the normal saline controlled group (NS group; 200 μL RBC solution+20 μL normal saline), Fengzhecao extract group (FZC group; 200 μL RBC solution+10 μL Fengzhecao extract+10 μL normal saline), wasp venom group (FD group; 200 μL RBC solution+10 μL wasp venom+10 μL normal saline), and Fengzhecao extract+wasp venom group (FCD group; 200 μL RBC solution+10 μL Fengzhecao extract+10 μL wasp venom), with 10 blood samples per group of every blood type. The solutions were put into the glass test tube respectively, and then into 37 ℃ water bath thermostat. After 10 minutes, the blood cell counting plate was directly observed under the microscope and the RBCs was counted. Differences in RBC count was compared between the same treatment factors of different blood types and between different treatment factor groups of the same blood type. Results:There was no statistically significant difference in RBC count between blood types under the same treatment factors. The RBC count (×10 9/L) of the type A, B, O, AB in the NS group were 5.567±1.368, 5.146±1.690, 4.577±0.774, 5.197±1.587 ( F = 0.852, P = 0.475), the FZC group were 5.751±1.489, 5.268±1.418, 4.727±1.174, 5.298±1.229 ( F = 0.987, P = 0.410), the FD group were 0.546±0.450, 0.804±0.428, 0.679±0.283, 0.846±0.453 ( F = 1.089, P = 0.366), and the FCD group were 5.532±1.330, 5.051±1.596, 4.589±0.879, 5.140±1.492 ( F = 0.820, P = 0.492), respectively. Comparison of RBC count between groups with different treatment factors of the same blood type was done. There was no significant difference between the FZC group and the NS group, indicating that the extract of Fengzhecao extract had no effect on hemolysis of RBC; in the FD group, it was significantly lower than the NS group (all P < 0.05), indicating that wasp venom had a significant hemolytic effect on RBC; but there was no statistically significant difference in RBC count between the FCD group and the NS group, indicating that the Fengzhecao extract antagonizes the hemolytic effect of wasp venom without affecting the RBC count; however, the RBC count in the FCD group was significantly higher than that in the FD group (all P < 0.05), further indicating that the Fengzhecao extract antagonizes the hemolytic effect of wasp venom. Conclusion:Wasp venom has a significant hemolytic effect which can be effectively antagonized by Fengzhecao extract and has nothing to do with the human ABO blood type.

Objective:To establish a candidate reference method for simultaneous determination of whole blood iron and copper based on ICP-MS technology.Methods:Cobalt (Co) was chosen as the internal standard, and was added gravimetrically into the standard solution and the whole blood sample. The whole blood sample was digested by electric heating plate and diluted. The isotopic ratios of 57Fe/ 59Co and 63Cu/ 59Co were measured by ICP-MS in the isotopic analysis mode. The precision, standard recovery and accuracy of the method were verified by measuring EQA materials and certified standard materials, and the performance of the method was further evaluated by method comparison. Results:The detection limit of iron is 0.136 mg/kg and the limit of quantification was 0.454 mg/kg in this method. The detection limit of copper in whole blood was 0.008 mg/kg and the limit of quantification was 0.027 mg/kg. The standard curve of copper ranges from 0.83-3.33 mg/kg, iron ranges from 167-667 mg/kg. The calibration curve of iron and copper was good linearity ( R 2>0.999 90). The precision of the method did well. The total CV range was 0.42%-0.68% for iron and 0.14%-0.94% for copper. The spike recoveries were all around 100%, the range of iron: 99.69%-100.07%; copper: 99.26%-100.51%. The correlation between this method and the existing clinical mass spectrometry methods was good. Conclusions:A candidate reference ICP-MS method for simultaneous determination of whole blood Fe and Cu was established. This is a simple and rapid method with good precision and spike recovery compared to the traditional one.