Water Adsorption Isotherms of Lipids

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Water Adsorption Isotherms of Lipids Derek Marsh Biophysical Journal Volume 101, Issue 11, Pages 2704-2712 (December 2011) DOI: 10.1016/j.bpj.2011.10.031 Copyright © 2011 Biophysical Society Terms and Conditions

Figure 1 Water adsorption (solid symbols) and desorption (open symbols) isotherms for dipalmitoyl phosphatidylcholine, (16:0)2PC (squares), and dipalmitoyl phosphatidylethanolamine, (16:0)2PE (circles), at 25°C (6). (Solid lines) Nonlinear least-squares fits of Eq. 4 to the isotherms and (dashed lines) fits of the BET isotherm (Eq. 4 with q = 1) given in the original publication (6) for water activities: aw = 0.1−0.4 for (16:0)2PC and aw = 0.1−0.3 for (16:0)2PE. Biophysical Journal 2011 101, 2704-2712DOI: (10.1016/j.bpj.2011.10.031) Copyright © 2011 Biophysical Society Terms and Conditions

Figure 2 Water adsorption isotherms of saturated phosphatidylcholines. (Top to bottom) Dicapryl phosphatidylcholine, (10:0)2PC, at 22°C (8); dimyristoyl phosphatidylcholine, (14:0)2PC, at 22°C (8); dipalmitoyl phosphatidylcholine, (16:0)2PC, at 22°C (circles (8)) and at 25°C (squares (6), triangles (14)); and distearoyl phosphatidylcholine, (18:0)2PC, at 22°C (8). (Solid lines) Nonlinear least-squares fits of Eq. 4 (dotted lines) and of Eq. 8 from hydration theory. Biophysical Journal 2011 101, 2704-2712DOI: (10.1016/j.bpj.2011.10.031) Copyright © 2011 Biophysical Society Terms and Conditions

Figure 3 Dependence of the interbilayer repulsive pressure, pint, on degree of hydration, nw, deduced from the water adsorption isotherms for dioleoyl phosphatidylcholine, (18:1cΔ9)2PC (solid circles), and 1-palmitoyl-2-oleoyl phosphatidylcholine, (16:0/18:1cΔ9)PC (open circles), at 25°C, according to Eq. 11. Data from Binder et al. (11,12). (Straight solid lines) Single exponential fits over the range of water contents: 2 ≤ nw ≤ 9. Biophysical Journal 2011 101, 2704-2712DOI: (10.1016/j.bpj.2011.10.031) Copyright © 2011 Biophysical Society Terms and Conditions