title: [Collection, processing and cryopreservation of placental cord blood hematopoietic stem cells].
abstract: OBJECTIVE
  To establish methods of collection, processing and cryopreservation of placental cord blood units.
  
  
  METHODS
  Between July 1997 and July 2000, 3,744 placental cord blood (CB) units were stored in Beijing Cord Blood Bank. All of CB units had been HLA-typed with molecular (sequence specific primer/sequence specific oligonucleotide, SSP/SSO) and serological methods. CB units were collected by trained midwives while the placentas remained in utero. Collected CB units were temporarily stored at room temperature and processed within 18 hours after collection. Depletion of red blood cells was performed using hydroxythyl starch with one time centrifuge. CB units were cryopreserved with DMSO and hydroxythyl starch.
  
  
  RESULTS
  The mean volume collected from 3,744 CB units was (93 +/- 22) ml (mean +/- s, range 45-198 ml). The mean total nucleated cell count per unit was 11.2 x 10(8) +/- 5.3 x 10(8) (rang 4.5 x 10(8)-45.1 x 10(8)). After depletion of red blood cells, the mean nucleated cell count was 9.7 x 10(8) +/- 4.6 x 10(8) (rang 3.1 x 10(8)-30.5 x 10(8)) with mean nucleated cell recovery of 79%. Forty CB units were thawed for testing, and trypan blue viability of nucleated cells was 88.2%. The recoveries of CFU-GM and CD34+ cells (ProCOUNT) were 97.6%, 86.4% respectively.
  
  
  CONCLUSIONS
  We have established a CBB, and have shown that our system of the whole procedure and methods is functional for supplying qualified cord blood units in transplantation.
authors.affiliation: Institute of Hematology, Peking University People's Hospital, Beijing 100044, China. kaiyanliu@mail.china.com
authors.forename: Kaiyan
authors.initials: K
authors.lastname: Liu
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Gao
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Jiang
authors.forename: Wenchuan
authors.initials: W
authors.lastname: Dong
authors.forename: Dan
authors.initials: D
authors.lastname: Li
authors.forename: Yilan
authors.initials: Y
authors.lastname: Wang
authors.forename: Ningwei
authors.initials: N
authors.lastname: Huang
authors.forename: Daopei
authors.initials: D
authors.lastname: Lu
mesh_terms: D001771:Blood Banks; D015925:Cryopreservation; D005260:Female; D005312:Fetal Blood; D006412:Hematopoietic Stem Cells; D006801:Humans; D010920:Placenta; D011247:Pregnancy