Product Description
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Merck Chemicals (Shanghai) Co., Ltd. is the subsidiary of the globally operating group Merck KGaA, Darmstadt (Germany) and provides Chinese market with high quality life science and chemical products and services
The contact persons for the specific product groups of the Chemicals businesses are listed on the website of Merck Group in China.
AI Product Description
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Thin Layer Chromatography (TLC) and High-Performance Thin Layer Chromatography (HPTLC) are essential analytical techniques widely utilized in pharmaceutical, chemical, food, and environmental industries for the separation, identification, and quantification of compounds within complex mixtures. TLC serves as a rapid, cost-effective screening tool, allowing scientists to monitor reaction progress, assess purity, or identify components using silica gel or other stationary phases coated on glass, plastic, or aluminum plates. The process involves applying a sample spot near the bottom of the plate, placing it in a developing chamber with a solvent system, and observing the migration distance of separated bands based on their polarity.
HPTLC represents an advanced evolution of traditional TLC, offering superior resolution, sensitivity, and reproducibility. Utilizing plates with smaller particle sizes and uniform layer thickness, HPTLC enables precise quantitative analysis that was previously difficult to achieve with standard methods. It is particularly valuable for fingerprinting herbal medicines, detecting adulterants in food products, and analyzing drug formulations in quality control laboratories. Both techniques require careful selection of mobile phases and stationary phases tailored to specific analytes to ensure optimal separation efficiency.
Key precautions include working in well-ventilated areas due to volatile organic solvents, wearing appropriate personal protective equipment such as gloves and safety goggles, and handling plates by edges to prevent contamination. Plates must be stored in desiccators to maintain dryness before use, as moisture can significantly alter retention factors. Furthermore, development chambers should be saturated with solvent vapor prior to running samples to ensure consistent migration rates. Post-development visualization often requires UV light or chemical derivatization reagents, which also demand strict safety protocols. While both methods are robust and versatile, proper calibration and adherence to standardized operating procedures are critical for generating reliable, reproducible data suitable for regulatory compliance and scientific research.