Miles Scientific Analtech Silica Gel G (Gypsum) TLC Plates, 250 um, 20 x 20 cm, Channelled, with Preadsorbent Zone, 25Pk - P31911

Glass-backed Analytical TLC Plates

Miles Scientific Analtech Brand Silica Gel G (Gypsum) TLC Plates, 250µm, 20x20cm, channelled, with Preadsorbent Zone, 25Pk

Product Number: P31911

Weight: 15.10 LBS

The preadsorbent zone on HPTLC UNIPLATES is 1.5 cm high. Low-form plates have the preadsorbent zone along the 20 cm edge. High-form plates have the preadsorbent zone along the 10 cm edge.

G - (Gypsum) Calcium Sulfate Hemihydrate binder

Analtech Brand Silica Gel G / GF

• Silica Pore: 60Å
• Silica Particle Size: 8-10 μm average
• Binder: Calcium sulfate a.k.a. gypsum (inorganic)
• Hardness: 20-40

Acceptable Solvents:

All typical chromatography solvents (20% water max)

Visualization Techniques:

Compatible with essentially all visualization reagents, even sulfuric acid charring. Spraying reagent is suggested; layer is incompatible with aqueous dipping technique.

General Description:

Considered to be the original “Classic” TLC plate. Gypsum (calcium sulfate) binder produces softer layer for easy scraping and removal of spots or bands for further analysis. This is the best choice when preparative work is needed using thicker coatings to isolate larger quantity of material. Because the binder is inorganic, it is compatible with aggressive visualization techniques such as sulfuric acid charring. Limited water tolerance due to slight solubility of calcium sulfate in water precludes dipping procedure but is applicable with spray techniques.

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 adsorption 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.

• Fluorescent indicator has green fluorescence at 254 nm
• Soft Layers with gypsum binder enable easy scraping of bands from plate
• G & GF layers contain no organic materials 

Preadsorbent UNIPLATES™

• 3cm wide sample application zone
• Concentrates sample spots on the plate
• Simplifies sample preparation and application
• Channeled version available

Preadsorbent UNIPLATES have an inert spotting zone along the bottom edge of the plate. This sample application region serves as a “holding zone” for sample spots until development of the plate is initiated. There is no significant resolution of sample components by the stationary phase in this region. All soluble components migrate with the solvent front, concentrating diffuse sample spots into vertically narrow
bands.

The adsorbent zone extends from the upper edge of the preadsorbent zone and covers the remaining area of the TLC plate. This zone exhibits the selective retention of sample components characteristic of the adsorbent employed. Separation of sample components occurs in the adsorbent zone in the same way as on a standard TLC plate.

Preconcentration of the sample results in compact zones at the beginning of the separation. Also, resolution and sensitivity are less dependent on sample application technique since all samples are concentrated to narrow bands regardless of the size or position in the zone of the sample spots.

Channeled UNIPLATES™

Channeled UNIPLATES are available in a variety of adsorbents and plate sizes including the preadsorbent format. These plates have 9 mm wide adsorbent tracks which are separated by 1 mm wide channels where the adsorbent layer has been removed. Channeled plates prevent cross contamination and the spreading of the sample components during development.