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Determining the Cellular Structure of Two Cereal Food Foams by X-ray Micro-Tomography

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Abstract

The cellular structure of two products, an extruded breakfast cereal and a short dough biscuit, was characterized by two different X-ray micro computed tomographic systems. Acquisitions were made by a compact desktop system Skyscan 1174 (Bruker μCT, Belgium) and at the European Synchrotron Radiation Facility (ESRF, beamline ID19, France) at different resolutions (voxel size of 6.5 μm, 7.5 μm, 16.2 μm and 25.8 μm). 3D images were processed for the density, the connectivity index and the granulometry of cells and cell walls. These experiments underlined the importance of the resolution for determination of quantitative measurements such as densities and thicknesses. The median width calculated for the cell walls distribution in the biscuit dropped from 141 to 50 μm when the voxel size changed from 25.8 to 7.5 μm. Images well showed that even though the food products had close values of porosity 0.6 and 0.7 for biscuit and extruded breakfast cereal respectively, their cellular structures were very different. The biscuit had small cells (median value of the distribution varied from 125 to 152 μm, according to resolution) and larger cell walls (50–141 μm) than the extrudate (32–109 μm) which, on the contrary, exhibited very large cells (307–400 μm). Beyond methodological issues, these differences could be clearly attributed to the differences of compositions and processes.

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Acknowledgments

Part of the research leading to these results has received funding from the European Community’s Seventh Framework Programme (FP7/2007–2013) under the grant agreement n_FP7-222 654, Dream project: Design and development of REAlistic food Models with well characterized micro- and macro structure and composition.

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Correspondence to Sylvie Chevallier.

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Chevallier, S., Réguerre, AL., Le Bail, A. et al. Determining the Cellular Structure of Two Cereal Food Foams by X-ray Micro-Tomography. Food Biophysics 9, 219–228 (2014). https://doi.org/10.1007/s11483-014-9336-5

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  • DOI: https://doi.org/10.1007/s11483-014-9336-5

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