PMC:2812708 / 5765-6903 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/2812708","sourcedb":"PMC","sourceid":"2812708","source_url":"https://www.ncbi.nlm.nih.gov/pmc/2812708","text":"There are two forms of hydrosol that are explained in Auweter et al. (1999). β-carotenes can precipitate as H-aggregate or J-aggregate; the two morphologies do not interconvert and are regarded to be kinetically stable over years. The H-aggregate is observed in precipitation of dilute solutions (0.3 weight%) whereas the J-aggregate is observed at higher concentration (1.0 weight%). Auweter et al. (1999) calculated a 40 nm hypsochromic shift observed for an H-aggregate and a bathochromic shift in J-aggregates. This results in a significant color change from yellow to red of the product depending on the precipitation conditions and hybrid particle size (Figs. 1, 2). This color change is the basis for the industrial application of the β-carotenes as pigments for food applications.\nFig. 1 Dashed line UV/vis spectrum of the core-shell β-carotene/gelatin sample with 0.05 g/l concentration; solid line UV/vis spectrum of gelatin at 1 g/l\nFig. 2 Left side Assumed structure of the β-carotene microparticle system (Auweter et al. 1999), right side color change of β-carotene/gelatin microparticles due to particle size and structure","divisions":[{"label":"figure","span":{"begin":789,"end":944}},{"label":"label","span":{"begin":789,"end":795}},{"label":"caption","span":{"begin":796,"end":944}},{"label":"p","span":{"begin":796,"end":944}},{"label":"label","span":{"begin":945,"end":951}}],"tracks":[]}