我们观察了43名足月适于胎龄儿孕38至41周脐血及母血中多胺的变化情况。发现在妊娠后期,脐血内多胺在孕40周达到高峰,母血内多胺在孕39周达到高峰,而胎盘组织内多胺在孕40周处于低谷;且发现男性新生儿胎盘组织内精胺及精眯精胺总量高于女性新生儿。结果表明,胎盘在母体与胎儿-胎盘系统之间的多胺平衡过程中起着重要作用,且不同性别胎儿-胎盘系统有其各自的特点。 We observed 43 full-term suitable for gestational age 38 to 41 weeks pregnant umbilical cord blood and polyamines in maternal changes. Found in the late pregnancy, polyamines in cord blood reached a peak at 40 weeks of gestation, polyamines in maternal blood peaked at 39 weeks of pregnancy, while placental polyamines in the 40 weeks of pregnancy at a low trough; and found that male neonates placenta Sperms and spermidine sperm total higher than female neonates. The results show that the placenta plays an important role in the polyamines balance between maternal and fetal-placental systems, and that different sexes have their own characteristics.