You will get an insight about your query from these articles :
Isolation of 6-, 8-, and 10-Gingerol from Ginger Rhizome by HPLC and Preliminary Evaluation of Inhibition of Mycobacterium avium and Mycobacterium tuberculosis
R. D. Hiserodt, S. G. Franzblau, and R. T. Rosen
J. Agric. Food Chem., 1998, 46 (7), pp 2504–2508
Preparative separation of gingerols from Zingiber officinale by high-speed counter-current chromatography using stepwise elution
Xiao Wanga, Zhenjia Zhengb
Food Chemistry
Volume 125, Issue 4, 15 April 2011, Pages 1476-1480
Thank you Dr.Preetha for your reply, I already saw these articles but the problem is that I want simpler technique using column chromatography on silica gel to isolate 6-gingerol