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Global small-angle x-ray scattering data analysis of triacylglycerols in the α-phase (part II)

DOI: 10.1021/acs.jpcb.8b06708 DOI Help

Authors: Marjorie Ladd Parada (University of Leeds) , Amin Sadeghpour (University of Leeds; Empa) , Josélio Vieira (Nestlé) , Megan Povey (University of Leeds) , Michael Rappolt (University of Leeds)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: The Journal Of Physical Chemistry B

State: Published (Approved)
Published: October 2018
Diamond Proposal Number(s): 15990

Abstract: The early stage crystallisation behaviour in a triacylglycerol mixture has been investigated on the nanoscale with a novel global small angle X-ray scattering analysis technique. This method has been tailored for the determination of the electron density profiles (EDP) replicating both, (i) the nanostructural texture of molten TAGs (refer to part I ‘Global Small-Angle X-ray Scattering Data Analysis of Triacylglycerols in the Molten State’ of this publication series), and (ii) the lamellar structure of the metastable α-polymorph. In a first stage, the α-phase scattering contribution alone was examined by classical Fourier analysis as well as by globally fitting the data, leading to practically identical EDPs. Based on these findings, we extended our analysis to the entire X-ray scattering contribution arising from molten TAGs and the solid α-phase fraction. Remarkably, the experimental and theoretical data agree very well, providing for the first time a detailed nanostructural understanding about the coexisting molecular assemblies. This allowed in turn, also to quantitatively determine the solid fat content (SFC) with X-ray scattering data. Our new theoretical approach for measurement of SFC is based on the global analysis of small angle scattering/diffraction patterns and the SFC-results are in good agreement with values obtained from other techniques such as NMR spectroscopy.

Subject Areas: Chemistry

Instruments: I22-Small angle scattering & Diffraction