Download Inorganic Synthesis, Vol. 8 by Holtzclaw H.F. (ed.) PDF

By Holtzclaw H.F. (ed.)

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Figure 11a shows the same chromatogram on TLC silica gel 60 material, both photographed under 254-nm UV light before derivatization with the Neu’s reagent. This example confirms the improvement in the separation efficiency by changing from TLC to HPTLC precoated layers. Figure 11: see Photograph Section. The newly introduced HPTLC-LiChrospher® Si 60 F254s precoated plates in many cases show a still better separation efficiency than the HPTLC silica gel 60 precoated plates. For example, Fig. 12a (HPTLC silica gel 60) and Fig.

These packages, protected in this way, are taken from the store or the TLC storage cabinet. Although the cardboard carton and styrofoam packaging are easy to remove (Fig. 16a,b), many fingernails have been broken opening the packages. Practical Tip: When opening the cardboard carton, use scissors or a screwdriver as a tool. The plastic film can then be opened using a laboratory scalpel in two ways: either the plates are left in the styrofoam container and the top film is cut twice diagonally, enabling the plates to be removed (Fig.

It is also to be recommended for stability testing and in trace analysis. g. raw materials testing, prewashed plates should always be used, as a dirty front would otherwise appear at the height of the substance zones under investigation (Fig. 19a,b). Figure 19: see Photograph Section. Prewashing is performed either by dipping (once or twice, using dipping times in the range 1–7 min) or by blank chromatography of the plate [16]. If dipping is performed over shorter time periods a uniform layer is certainly obtained, but the desired cleaning effect is often not as good.

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