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Selected Publication:

Schmidt, J; Gergely, S; Schonlechner, R; Grausgruber, H; Tomoskozi, S; Salgo, A; Berghofer, E.
(2009): Comparison of Different Types of NIR Instruments in Ability to Measure beta-Glucan Content in Naked Barley
CEREAL CHEM. 2009; 86(4): 398-404. FullText FullText_BOKU

Abstract:
Importance of beta-glucan in human nutrition is mirrored in numerous approval applications registering beta-glucan containing products as health beneficial products in accordance with forthcoming EU Health Claims Regulation. In comparison to other cereals, barley contains considerable amounts of beta-glucan. Naked barley is of particular interest because it circumvents the costs and loss of beneficial substances related to dehusking. In this study, the potential of near-infrared spectroscopy as an accurate, fast and economic method of determination of beta-glucan in naked barley was appraised. Four different near-infrared instruments were used to analyze 107 barley samples, in both whole grain and milled form. Importantly, both black and purple pericarp samples, which are of additional nutritional interest due to high anthocyanin content, and waxy samples, which show an extraordinary high beta-glucan content could be analyzed within the same calibration set as the normal samples. All tested dispersive near-infrared reflection instruments showed suitability for supervision of breeding experiments and beta-glucan monitoring in food industries (R-2 > 0.78). Common, industrially used near-infrared transmission instruments also provided reasonable results, although only suitable for rough selection according to beta-glucan levels. On the other hand, the Fourier transform near-infrared reflection instrument was able to perform analytical analyses (R-2 = 0.96-0.98).
Authors BOKU Wien:
Berghofer Emmerich
Grausgruber Heinrich
Schmidt Julia
Schönlechner Regine



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