Experiment OP - 10.1021/bi00687a021/1

Article DOI 10.1021/bi00687a021
Data DOI N/A
Internal ID 10.1021/bi00687a021/1
Membrane composition (molar fraction)
DPPC 1,2-dipalmitoyl-sn-glycero-3-phosphocholine 1
Solution composition Pure water
Temperature (K) 322
Total hydration 50 (mass %)
pH UNKNOWN
Reagent sources
DPPC Synthesized locally (dipalmitoyl-3-sn-phosphatidylcholine), specifically deuterated at the choline (alpha, beta, gamma) and glycerol (C-3) positions.
water H2O and D2O
Sample protocol DPPC bilayers were prepared by thoroughly mixing lipid (50 wt %) and water (50 wt %). Approximately 200-500 mg of liquid crystalline phase was used for measuring powder type spectra. Samples were sealed in ampoules and equilibrated above the phase transition temperature.
Show on GitHub experiments/OrderParameters/10.1021/bi00687a021/1 main

Name Value
DATE 1975
NMR
Key Value
T_RF_HEATING UNKNOWN
INSTUMENT Bruker-Spectrospin HX-90-FT and WH-270-FT
METHOD 2H:SP
SIGN_MEASURED NONE
DETAILS The experiment studied the headgroup and glycerol backbone (g3) conformation. Absolute values of order parameters (|S_CD| = 0.00784 x Δν) were given in the publication as a function of temperature. The numbers given here were calculated (by @markussmiettinen) by fitting a line to the data points nearest to 322K and reading the value of the fit at 322K. For g3 the deuterium magnetic resonance spectra reveal two quadrupole splittings with separations of about 27 and 29 kHz" = 0.21168 and 0.22736 in terms of order parameters.The values below are extracted from Fig 6 of the publication, which showed the average value of two couplings with a difference of about 2 kHz" = 0.016, hence the values below are the fitted value of 0.220136724393763 +/- 0.008. It is not specified in the publication which hydrogen corresponds to which splitting value, so HA has been assigned the largest magnitude and HB the smallest. Signs determined as described in http://arxiv.org/abs/1309.2131v2

Order Parameters DPPC

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