How can I remove the pigments and get purified starch from chenopodium album seed during isolation?
For removal of green color, you can use solvent used for chlorophyll estimation such as acetone or even you can use EtOh or MeOH. DMF (dimethyl formamide) also you can use.
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From chenopodium album seed, use of sulphur dioxide will be beneficial during extraction procedure. Besides these there are some commercial available food grade bleaching agents that can be used during extraction steps.
Please go through this article
http://www.ripublication.com/ijafst_spl/ijafstv4n10spl_05.pdf
I suggest you to sequentially filter your seed extract through activated charcoal. It will selectively adsorb all the pigments such as chlorophyll and gives you clear, colorless extract. The filtered extract can be confirmed for the presence of starch by qualitative analysis using iodine test.
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