Miles Scientific Analtech 150 Silica Gel G (Gypsum) Prep TLC Plates, Glass-backed, 1000 um, 20 x 20 cm, 25/Pk - P18013

Glass-backed Prep TLC PLATES

Miles Scientific Analtech Brand 150Å Pore Silica Gel G Prep TLC Plates - Glass-backed - 1000µm thickness - 20x20cm - Box of 25 Plates

Product Number: P18013

• G - (Gypsum) Calcium Sulfate Hemihydrate binder

Silica Gel G & GF UNIPLATES™

These plates use a 150 Angstrom pore silica gel.  Its polarity is slightly less than the standard 60 Angstrom pore TLC plates.  It may be necessary to reduce the polarity of the mobile phase to obtain equivalent separation.  However, this decrease produces greater separation in the higher Rf regions of the plate while maintaining resolution in the lower zones.  They are suitable for moderately to strongly polar compounds.

The 150A Silica Gel plates use an organic polymer binder which results in a stable, abrasion resistant surface.  The moderately hard surface offers easier handling and simplifies sample application.  It can be written upon with a dull lead pencil.  The 150A Silica Gel plates are compatible with most organic solvents and will tolerate approximately 70-80% water in the mobile phase.  They are compatible with most visualization reagents but are not recommended for aggressive techniques such as sulfuric acid charring.  Layers are available with and without a UV254 fluorescent indicator.  A variety of sizes is available.

Silica Gel G & GF UNIPLATES are the most widely used silica gel TLC plates. No organic substances are added to these products, thus making them compatible with sulfuric acid charring visualization. These plates are commonly scraped from the glass backing to isolate separated components for other analytical procedures. They are compatible with all organic solvents, however, they are not recommended for use in systems containing greater than 20% water because of the solubility of the gypsum binder in aqueous solutions (For water tolerance see the GHL & GHLF series of plates).

The “G” stands for Gypsum and indicates that calcium sulfate hemihydrate (CaSO4•1/2H2O), a refined form of gypsum, has been included in the adsorbent formulation. Gypsum functions as a binder, improving the cohesion of the adsorbent particles and increasing the adhesion of the layer to the glass substrate. The “F” indicates the presence of a short wave UV indicator that is fluorescent at 254 nm.

Preparative TLC plates have adsorbent layers thicker than the 250m microns. Thus, preparative plates can be used for separation of larger quantities of materials. The loading capacity for a given degree of sample component resolution increases roughly as the square root of the adsorbent layer thickness. In preparative TLC, materials to be separated are often applied as long streaks rather than spots. After development, specific compounds may be recovered by scraping the adsorbent layers from the plate in the region of interest and eluting the separated material from the adsorbent using a strong solvent.

• Thicker layers for higher capacity 
• Full range of plate sizes
• Prep-scored option for convenient zone location
• Available with preadsorbent sample loading zone
• Calcium sulfate binder-soft later for easy scraping