Important questions in emulsion science are composition, release kinetics, and structure of multiple emulsions (Fig. 1).  In a quasi-continuous phase, an emulsion is dispersed, consisting of oil and an inner water phase. As these systems are often opaque and dilution additionally influences the system's equilibrium states, NMR is ex-ploited to give insight into geometrical structure as well as composition and molecular dynamics.Structure can be addressed by PFG-NMR. Signals of the different phases can be dis-criminated either by chemical shift, relaxation or diffusion contrasts[1-5]. Apart from size distributions, influencing e.g. mouth feel, microbial and physical stability and shelf life stability, also composition is of interest, mainly in the context of process and product development. NMR spectros-copy can be exploited, also at low magnetic fields. Additional differentiation is found in terms of diffusion or relaxation fro double emulsions. Different schemes will be compared in this respect. Molecular dynamics is addressed by either PFG-STE NMR or spectroscopy in combination with paramagnetic relaxation enhancement.References: [1] M. L. Johns et al., Progr. NMR Spectroscopy 2007  , 50, 51.  [2] X. Z. Guan et al., EJLST 2010  , 112, 828.  [3] R. Bernewitz et al., Magn. Reson. Chem. 2011  , 49, S93.  [4] J. P. M. van Duynhoven et al., Magn. Reson. Chem. 2002  , 40, S51.  [5] M. A. Voda et al., Trends Food Sci. Technol. 2009  , 20, 533.

Structure and molecular dynamics in (double-)emulsions by NMR

245th National Meeting (2013)

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