Sr. De Vriese et al., The composition of saturated fatty acids in plasma phospholipids changes in a way to counteract changes in the mean melting point during pregnancy, LIPIDS, 36(1), 2001, pp. 15-20
It has been demonstrated that in pathological conditions with an increase i
n the calculated mean melting point (MMP) of phospholipid (PL) fatty acids
(FA) there are changes in the composition of the saturated FA (SFA), which
partially counteract this effect: shorter-chain SFA with lower melting poin
ts are increased, while longer-chain less fluid SFA are suppressed. The aim
of this study was to determine whether there are differences in MMP during
pregnancy and in the newborn and, if so, whether similar adaptive changes
occur in the composition of the SFA. The FA composition of plasma PL was de
termined in healthy women (n = 16) twice during pregnancy (15-24 wk and 29-
36 wk) and at delivery and in umbilical venous blood obtained at birth. The
MMP of maternal PL was significantly higher at delivery compared to mid-ge
station, due to a loss of highly unsaturated FA (HUFA) which were replaced
by SFA. In addition, changes in the SFA occurred: 16:0 with lower melting p
oint was higher while 18:0 with higher melting point was lower at delivery.
MMP of PL FA in umbilical plasma was lower than in maternal plasma at deli
very, which was due to higher HUFA content. In contrast to maternal plasma,
16:0 was lower while 18:0, 20:0, and 24:0 were higher in umbilical plasma
resulting in a higher MMP of SFA, tending to raise the overall MMP. It can
be concluded that, during pregnancy and in the newborn, the FA composition
of SFA changes in a way to counteract changes in MMP induced by reduced and
increased HUFA, respectively.