Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 430827
Title The use of ATR-FTIR imaging to study coated oil capsules
Author(s) Heussen, P.C.M.; Dalen, G. van; Nootenboom, P.; Smit, I.; Duynhoven, J.P.M. van
Source Vibrational Spectroscopy 60 (2012). - ISSN 0924-2031 - p. 118 - 123.
DOI https://doi.org/10.1016/j.vibspec.2012.01.012
Department(s) Biophysics
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) ir microspectroscopy - array detector - microscopy - compaction - samples
Abstract Fourier transform infrared (FTIR) spectroscopic imaging using a large Internal Reflection Element (IRE), also called Attenuated Total Reflection (ATR) crystal, can be used for the identification and localisation of chemical compounds in solid food products. In this study ATR-FTIR imaging, by means of a large area crystal with a contact diameter of 600 µm with a linear array detector, was used to elucidate the microstructure of the coating of a sophisticated multi-layered oil capsule with active ingredients (sodium ascorbate, sucrose, gelatine, gum, isoflavone). ATR-FTIR imaging with the aid of principal component analysis (PCA) showed the spatial location of the individual ingredients within the layers and that these ingredients are not uniformly distributed within the layers. By ATR-FTIR imaging it was determined that the layer thickness of the soft central coating layer containing lycopene, sodium ascorbate, sucrose and air is about ~156 µm, the 1st sucrose layer ~180 µm and the gelatine/gum ~28 µm. The latter was confirmed by X-ray microtomography (µCT). The other layers could not be identified by µCT.
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