| http://www.w3.org/ns/prov#value | - In virtually all the processes described in the literature, including patents, invariably the first step of isolation and purification of the xanthophylls, such as lutein, is the aqueous saponification of oleoresin (specifically marigold) using an alcoholic and/or aqueous alkali preferably KOH. The saponification steps in these processes generally employ the use of water in the process.
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