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Silica Gel differences - Help Needed :)
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mk-1

Joined: 20 Feb 2005
Posts: 86
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Fri Feb 25, 2005 6:46 am
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Ive been pondering. Say I got a ref which has rF values for my product on a certain silica gel type (like type G, H, different mesh sizes, etc...).
If I was to replace that type with another, would the rF values change as well?

M.K.1
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methyl_ethyl
Riedel De Haen
Joined: 18 Feb 2005
Posts: 107
Location: Estonia
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Fri Feb 25, 2005 8:12 am
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More than likely yes, any time you change any aspect of the system it is possible to realize a change in rf, and many times if you try to reproduce exactly what you have done with the same exact system you may still see a change in RF Sad Your analyte could have affinity/interaction (bad terminology I know) with Gypsum, therefore rf could be different between a G and H plate. If you change the mesh size you will also more than likely experience a change in rf. As far as I am concerned the only way to more accurately qualitatively analyze your separation is by running a known standard, under optimized conditions. But then again I can't see myself ever running a TLC plate for any reason, so I guess you can take this advice with a grain of salt. Hopefully there are some TLC experts lurking around here, (I am sure there are) that can give you a better practical explanation than I.

much_love

methyl_ethyl
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mk-1

Joined: 20 Feb 2005
Posts: 86
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Fri Feb 25, 2005 6:24 pm
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OK, so if rF values will change, how will I know how to clean my end product if I can no longer rely on literature?

M.K.1
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