The metastability of saturated phosphatidylcholines depends on the acyl chain length.

The metastability of saturated phosphatidylcholines depends on the acyl chain length.
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饱和磷脂酰胆碱的亚稳定性取决于酰基链的长度。

DOI:
10.1016/0005-2736(86)90086-6
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发表时间:
1986
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Singer,MA
Singer,MA
中科院分区:
--
文献类型:
--
作者:
Finegold,L;Singer,MA

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We report the peak temperatures and enthalpies of the main (gel to liquid crystal) transitions and‘s-transitions’ of symmetric saturated PC's (C n, PC) with n varying from 12 to 22, where s-transition is defined as the transition between metastable and stable phases. The line for s-transition peak temperature versus n (t= 1.98 n–16.0° C) the crosses the corresponding pre-and main-transition curves between n= 12 and 14. We also find that the metastability pattern for lipids of n less than 14 is different to that for n greater than 14 (and is similar to that of the phosphatidylethanolamine analogs). For n greater than 14 the enthalpy of the s-transition decreases with increasing n and extrapolates to zero above n= 20, implying that the s-(orthorhombic) and gel (quasi-hexagonal) phases become identical. That simultaneous gel-liquid crystal transition and metastability is restricted to the range n= 12 to 20 may be correlated with the predominance in natural lipids of these acyl chain lengths.
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