【Objective】 To evaluate the quality of platelet concentrates prepared by two different blood collection bags, so as to provide references for the development of high-quality platelet preparation. 【Methods】 Platelet concentrates were prepared using buffy coating from the whole blood collected by conventional and optimized single-use blood collection bags with leukoreduction filter, respectively. The volume of whole blood collected was 400 mL, and 60 bags in total. They were divided into group A (conventional collection bags, n=30), and the size of buffy coating pouch was 15 cm×12 cm; group B (optimized collection bags, n=30), and the size of buffy coating pouch was 11 cm×9 cm. 【Results】 There were significant differences between group A and group B in the amount of red blood cells contamination, platelet content, and platelet yielding rate (P<0.05), which were (2.62±0.57)×10⁹/mL vs (1.37±0.35)×10⁹/mL, (4.41±0.31)×10¹⁰/mL vs (6.21±0.63)×10¹⁰/mL, and (55.03±0.06)% vs (79.23±0.09)%, respectively. 【Conclusion】 The buffy coating pouch with the size of 11 cm×9 cm can produce better platelet concentrates, thus improves the safety and efficacy of clinical blood transfusion.

【Objective】 To investigate the quality of cryoprecipitates prepared from buffy coat-derived plasma of fresh whole blood at room temperature 20℃-24℃ isolated at different time periods, explore the optimal time for preparing cryoprecipitates, so as to improve the utilization rate of blood. 【Methods】 A total of 250 bags of whole blood collected by CPDA-1 and stored at 20℃-24℃ from October 2020 to December 2020 were randomly selected as the experimental group, and divided into groups A1 (0-8 h), A2 (8-10 h), A3 (10-12 h), A4 (12-14 h) and A5 (14-16 h) (with 50 bags in each group) according to the preparation time point. The upper-buff-coat plasma was separated and quickly frozen as the source for cryoprecipitates. Meanwhile, another 50 bags of fresh frozen plasma prepared within 0-16h after routine storage at 2℃-6℃ were randomly selected as the control group (group B), which was used as the raw plasma to make cryoprecipitate. Coagulation factor Ⅷ (Ⅷ factor) and fibrinogen (FIB) were detected, and the effect of different preparation time and different storage temperature on the content of factor Ⅷ and FIB and the pass rate were compared. 【Results】 In comparison to the control group, the Ⅷ factor content of groups A4 and A5 was significantly decreased, and the differences between groups A4, A5 and B were statistically significant (P<0.001). There was no statistically significant difference in the effect of preparation of buffy coat-derived plasma on the FIB quality of cryoprecipitate in different time periods (P>0.05). The Factor Ⅷ content ≥60 IU/ bag prepared from buffy coat-derived plasma accounted for 96.4% (1.5 U) in the experimental group. 【Conclusion】 The buffy coat-derived plasma prepared within 12 h at 20℃-24℃ is suitable for preparing 2 U cryoprecipitate coagulation factor, while that prepared within 12-16 h is suitable for preparing 1.5 U cryoprecipitate coagulation factor.