Capturing natural chromophores on natural and synthetic aluminosilicates

摘要

Several materials such as zeolites, clays, alumina, and hydrotalcite were tested as adsorbents of carmine cromophores from hibiscus Sabdariffa L. tropical flower. Majority of materials were unable to trap and stabilize the chromophore, some of them were not coloured and by the other ones the chromophore was chemically degraded, a change of colour was observed. The best adsorbents were natural mordenite zeolite from Oaxaca, Mexico and montmorillonite from Wyoming, USA. These two materials sequester the colour of flower and maintain this colour for several months and they resist even acid attacks. From characterization of pigments the interaction anthocyanine-adsorbent is proposed.