title: Storage of Buffy-coat-derived platelets in additive solutions: in vitro effects on platelets prepared by the novel TACSI system and stored in plastic containers with different gas permeability.
abstract: BACKGROUND
  The novel TACSI system is designed for automated preparation of platelets (PLTs) from pooled buffy coats (BCs). One TACSI device will handle 6 units at the same time. The aim of our in vitro study is to investigate the effects of using this automated equipment with subsequent storage in two different plastic containers and to compare these results with PLTs prepared by the OrbiSac system.
  
  
  METHODS
  Buffy-coat-derived PLTs (n=8) were prepared by using the TACSI system, including storage in polyvinyl chloride (PVC)-based plastic containers with di, n-decyl phthalate (DnDP) (TACSI R) and BTHC (TACSI T)-based plasticizers. As a reference, the OrbiSac System was used to prepare PLTs (n=8) with subsequent storage in a PVC plastic container with a citrate-based plasticizer (BTHC). In total, 16 TACSI and eight reference units, supplied by approximately 30% plasma and 70% SSP+, were analysed for various in vitro variables during the 7-day storage period.
  
  
  RESULTS
  No significant difference in PLT counts, LDH, mean platelet volume (MPV) and adenosine triphosphate between the groups was detected. Glucose was lower (P<0·05) and lactate was higher (P<0·05) in TACSI R vs. OrbiSac. With exception of day 7 (P<0·05 TACSI R vs. OrbiSac), HSR reactivity were not different between groups. Extent of shape change was lower and CD62P higher in TACSI T when compared with TACSI R and OrbiSac units (P<0·05). pH was maintained at >6·8 (day 7) and swirling remained at the highest level (score=2) for all units throughout storage.
  
  
  CONCLUSIONS
  Platelets prepared by the TACSI system with subsequent storage in two different PVC-based plastic containers were equivalent to reference PLTs with regard to in vitro characteristics during 7 days of storage.
authors.affiliation: Department of Clinical Immunology and Transfusion Medicine, Karolinska University Hospital, Stockholm, Sweden. per.sandgren@karolinska.se
authors.forename: P
authors.initials: P
authors.lastname: Sandgren
authors.forename: M
authors.initials: M
authors.lastname: Hild
authors.forename: A
authors.initials: A
authors.lastname: Sjödin
authors.forename: H
authors.initials: H
authors.lastname: Gulliksson
mesh_terms: D058621:Blood Buffy Coat / Q000166:cytology*; D001792:Blood Platelets / Q000166:cytology*; D005260:Female; D006801:Humans; D008297:Male; D010983:Plateletpheresis / Q000295:instrumentation / Q000379:methods; D011309:Preservation, Biological / Q000295:instrumentation / Q000379:methods; D013997:Time Factors