| 摘要 |
A process comprises contacting a carotenoid-containing liquid with a composition comprising at least one pi-bondÂphilic species, and removing the carotenoid complex from the liquid. The pi-bond-Âphilic species may be a metal or metalloid. The composition may comprise a clay, zeolite AgO, Ag2O or silver silicates. Food-grade carotene was extracted from palm oil by treating with Ag-clay of formula Ag1.2[Mg4.8Li1.2 Si8O20(OH)4]. Alternatively, a hectorite clay is described wherein some of the sodium ions are replaced by silver ions. A synthetic hectorite clay was prepared from MgCl2.6H2O, LiCl, Na2Si3O7 and Na2CO3 in water under microwave irradiation; subsequent treatment with AgNO3 gave a silver intercalated synthetic clay. |
