Miles Scientific Analtech Silica Gel G (Gypsum) TLC Plates, 250 um, 20 x 20 cm, Scored (2.5 x 20 cm), with Preadsorbent Zone - P31311

Glass-backed Analytical TLC Plates

Miles Scientific Analtech Brand Silica Gel G (Gypsum) TLC Plates, 250µm, 20x20cm, scored (2.5x20cm), with Preadsorbent Zone

Product Number: P31311

Weight: 11.10 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.

Scored UNIPLATES™

Most UNIPLATES can be supplied with the glass backing scored at specific locations to permit convenient “snapping” into smaller plates. This Analtech feature provides increased versatility and can mean cost savings over plates already cut to smaller sizes.

Different adsorbents, mobile phases, and analytical conditions can be tested quickly and economically. A plate can be spotted, then snapped into several smaller plates for developing in different solvent mixtures to determine the best separation.

A plate can be spotted, developed, then snapped into several smaller plates, and then subjected to different visualization techniques.

Scored UNIPLATES are available in two standard formats:

1) 20 x 20 cm scored UNIPLATES have three score marks 5 cm apart. Each plate can be snapped to produce four 5 x 20 cm plates or any multiple of 5 cm width.

2) 10 x 20 cm scored UNIPLATES have seven score marks 2.5 cm apart. Each can be snapped to produce eight 2.5 x 10 cm plates or any multiple of 2.5 cm width.