I would like to check TLC for some high polar Flavonoid glycosides soluble in DMSO. what should be the ideal developing solvent system for silica glass TLC?
Acetonitrile-water systems are commonly used for many oligosaccharides and monosaccharides. Depending on the polarity of the aglycone, you should try anything from 98% acetonitrile/2% water to 75% acetonitrile/25% water. Multiple ascents may also be useful. This entails running the solvent to the top of the plate, drying the plate, and running it again. Be sure to dry all of the DMSO from the applied spot before running the plate; otherwise, it will cause streaking and poor resolution. Since DMSO is difficult to completely remove, you might consider other solvents.
Thank you very much for your answer. however, it is very difficult to remove DMSO from the TLC spot. In general, what method do you use to remove it. Can you suggest other solvents as substitute of DMSO. In my understanding water is also not good and moreover, all glycoside are not soluble in it.
I almost never use DMSO as a solvent, so my experience is limited. It may be helpful if you could dilute your samples with ethanol or water prior to spotting them on the plate, and spot the sample in incremental amounts, drying with a hair dryer in between each spotting. The best advice I can offer is just to try it, make sure the spot is as dry as possible, and see what happens.
You can use ethyl acetate: methanol: water (20:2.5:2.5) for mono and di glycoside. if you see more polar compounds than increase some more polarity by adding methanol and see what happens
In general, the mobile phase TLC for flavonoid glycosides is ethyl acetate - formic acid - glacial acetic acid - water (100:11:11:26). If the addition of methyl ethyl ketone (ethyl acetate-methyl ethyl ketone-formic acid-glacial aseta acid - water (50:30:7:3:10)
detection is by uv light
or hydrolise the glycosides and try for the aglycones is another best method for tlc.
some more solvwent systems: may be useful for flavonoid glycosides tlc