Hydration of synthetic polydialkylphosphate (PPF) ? a simplified model for natural teichoic acids

Abstract

Abstract:The hydration of synthetic poly(P-hydroxy 1,3 propylenephosphate) in hydrogen and mixed H § § forms has been studied by means of the pulsed NMR method. This polymer may be regarded as a simplified model of natural teichoic acids appearing in a cell wall of gram-positive bacteria. The investigations of nuclear magnetic relaxation of water protons in polymer gels prove the existence of two phases of water. One is water strongly bound to phosphate groups which does not freeze at low temperature and the other is weakly bound water freezing at 243-253 K. The distribution of correlation times has been stated for water in the first hydration shell of phosphate groups. For both acid and magnesium salt forms the hydration shell is composed of three water molecules.

Pulsed NMR studies of translational mobility of polymer molecules in polydialkylphosphate gels

“…The average degree of polymerization (r~) has been determined by the end group method [7]. The preparation of PPP in hydrogen and mixed hydrogen-magnesium (a --0.5) forms of water content from 2 to 18 moles of water per one mole of phosphate groups (n) were described in our previous paper [1].…”

“…In our previous papers [1,2] we presented the results of investigations of hydration of low molecular weight PPP (r~ = 8). The proton magnetic relaxation K 23 and the translational mobility of water molecules in polymer gels, as studies by the pulsed NMR method, were discussed.…”

Polymers with Esters of Phosphoric Acid Units: From Synthesis, Models of Biopolymers to PolymerInorganic Hybrids

“…The translational motions of water in poly(trimethylene phosphate) ( 13 ) gels has been studied by the NMR pulsed field gradient technique 61–63. In polymer gels there are two phases of water with different translational mobility.…”

“…In polymer gels there are two phases of water with different translational mobility. One is water strongly bound to phosphate groups, which does not freeze at low temperatures, and the other is weakly bound water, which freezes at 243–253 K 61…”

Hydration of synthetic polypropylenephosphate (PPP) ? a simplified model for natural teichoic acids Part 3. Bound (nonfreezing) water in PPP gels by the pulsed Fourier transform NMR method

“…The results of pulsed HNMR studies of synthetic poly(1,3 propylenephosphate) hydration, a simplified model for membrane teichoic acids, appearing in gram-positive bacteria, have been published earlier [1][2][3]. The results of temperature investigations of the longitudinal and transverse relaxation and translational mobility of water and polymer molecules in PPP gels have mainly given us an insight into the dynamics of molecular motion within the gels.…”