# Hydration of Single Crystals of Dipalmitoylphosphatidylcholine

 Title: Hydration of Single Crystals of Dipalmitoylphosphatidylcholine Author: Urabe, T.; Asher, S. A.; Pershan, Peter S. Note: Order does not necessarily reflect citation order of authors. Citation: Urabe, T., S. A. Asher, and Peter S. Pershan. 1981. Hydration of single crystals of dipalmitoylphosphatidylcholine. Proceedings of the National Academy of Sciences 78(8): 4941-4945. Full Text & Related Files: Urabe_Hydration.pdf (867.2Kb; PDF) Abstract: Optical birefringence and x-ray measurements are reported for single crystals $$(0.5 mm \times 2 mm \times 5 \mu m)$$ of dipalmitoylphosphatidylcholine as a function of temperature and relative humidity. Large single crystals grown in $$CHCl_3$$/acetone at a low water concentration undergo an irreversible phase transformation at $$20^{\circ}C$$ and 70% relative humidity or at $$60^{\circ}C$$ and 65% relative humidity. After this transformation occurs, the crystals can be made to undergo a reversible transformation into and out of the $$L_{\alpha}$$ phase. The x-ray-determined mosaic spread in the hydrated crystal is less than $$\approx 0.04^{\circ}$$ both above and below the main transition. Published Version: doi:10.1073/pnas.78.8.4941 Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10361922 Downloads of this work: