I would not try to separate them, but instead use a quatitative approach like solid-state 13C NMR to determine relative amounts. See publications by P.G. Hatcher et al.

Thanks, but I need separation method.

Thanks Paul Lyons, can you try for separation method..

hello majid .about your question you can see the paper in Journal of Food and Nutrition Sciences, 2011, 2, 780-784 attached .

Hi, Alaa Mahrath, Thanks a lot, it is very useful.