Chromatography

  QuEChERS(pronounced“catchers") stands for Quick, Easy, Cheap, Effective, Rugged and Safe - the qualities that describe this sample preparation method for food substances.The technique is quite simple, involving a minimum of steps, and is effective for the cleanup of complex samples. ＋ Welchrom®QuEChERS  Workflow Step 1: Extraction Transfer homogenized sample (10g or 15g) to a 50ml tube; then aad extraction sovent and salt, shake for centrifuge > 1500 rcf for 1 minute. Welchrom® QuEChERS Extraction Kits: ·50 ml tubes ·Pre-packaged MgSO4, NaCl or other salts Step 2: Clean up Choose a right clean-up tube; transfer the extracted sample in Step 1 to clean up tube; shake for 30 seconds, then centrifuge > 1500 rcf for 1 minute. ＋ Method Introduction The QuEChERS method is a residue detection method for multiple target objects in the analysis of pesticide residues in the matrix  with high water content (80-95%). It is the fast version of SPE with the similar purification ...

When you look up the pharmacopoeia method, you may find that it only stipulates the bonding phase of column and the information of other columns is not available. Therefore, you may feel confused about how to choose a suitable column. Welch Materials, as the most professional chromatographic consumables manufacturers in China, would like to share with you some experience as follows. 01 Basic Knowledge of Column Chromatography is a separation analysis method, separation is the core, so the column which can achieve separation is like the heart of the chromatographic system. Common requirements for column are high column efficiency, good selectivity, fast analysis speed, etc. Packing materials for HPLC are mainly all-porous spherical silica gel, organic polymer matrix, core-shell silica gel, etc. The particle size is generally 3,5,7,10 µm, etc. And theoretical number of plates can reach 80,000 / m. 02 Selection of S...