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1H-decoupled 31P NMR powder spectra of DMPC MLV samples as a function of concentration and pH: with sorbic acid at pH 4.4 (A) and 7.4 (B), with decanoic acid at pH 4.4 (C) and 7.4 (D), obtained using a Hahn-echo pulse sequence under static condition at 35 °C. The concentrations of the weak acids are 0 (in black), 5 (in red), and 10 (in blue) mol %, respectively.
