The thesis mainly relates to a process to obtain xanthophylls concentrates of high purity from plant extracts. After drying under high vaccum, the crystalline is analyzed to be lutein with purity of more than 80 percent with IR, UV,NMR and HPLC.The thesis also relates to a process leading to the isomerization of Lutein to zeaxanthin and/or zeaxanthin-like epimers. The marigold extract is admixed with glycols and enough alkali. At the inert atmosphere, the mixture is heated to the temperature of about 100℃ f...
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