Abstract
Carotenoids are important antioxidants found in various foods including those for nutrition of infants. In this investigation, the total carotenoid content (TCC) of nine different commercially available baby foods was quantified using colorimetric index \(a\)* obtained via reflectance colorimetry (RC) and by laser photoacoustic spectroscopy (LPAS) at 473 nm. The latter requires a minimum of sample preparation and only a one time calibration step which enables practically direct quantification of TCC. Results were verified versus UV–Vis spectrophotometry (SP) as the reference technique. It was shown that RC and LPAS (at 473 nm) provide satisfactory results for \(a\)*, \(R^{2}\) = 0.9925 and \(R^{2}\) = 0.9972, respectively. Other color indices do not show a correlation with TCC. When determining the TCC in baby foods containing tomatoes, it is necessary to select a different analytical wavelength to compensate for the effect of lycopene’s presence in the test samples.
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Dóka, O., Ajtony, Z., Bicanic, D. et al. Direct Quantification of Carotenoids in Low Fat Baby Foods Via Laser Photoacoustics and Colorimetric Index \({{\varvec{a}}}\)*. Int J Thermophys 35, 2197–2205 (2014). https://doi.org/10.1007/s10765-014-1575-7
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DOI: https://doi.org/10.1007/s10765-014-1575-7