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  • elution
  • It is necessary to determine the range of pore diameters and pore volume of a silica gel by a special experimental procedure that is designed to obtain accurate retention volume measurements for solutes eluted in relatively small elution volumes. (chromatography-online.org)
  • The processes involve ligand-assisted elution or displacement chromatography methods using robust, low-cost, inorganic sorbent titania or polymeric sorbents. (phys.org)
  • Because of the abundant separating columns, elution systems, and detectors available, chromatography has developed into the main method for ion analysis. (wikipedia.org)
  • impurities
  • All of these indicated the presence of a large amount of impurities. (issuu.com)
  • Peptides having a greater number of amino acid residues than eight can be synthesized, but, unfortunately, as the number of residues increases so does the amount of peptide impurities that results from incomplete reaction in earlier stages of the synthesis. (chromatography-online.org)
  • Wang has developed new chromatography separation techniques that could separate rare earth elements first from other impurities and then from each other by using only a few chromatography units. (phys.org)
  • amino
  • 1/ The bonded silica carrying the anchoring amino acid is washed with dioxane and the tertiary butoxy protecting group attached to the amino acid removed with 4N-HCl. (chromatography-online.org)
  • 3/ The amino acid chloride that is now attached to the silica is treated with triethylamine in chloroform to release the base. (chromatography-online.org)
  • 5/ The next protected amino acid is coupled to the amino acid on the silica by a peptide bond using a solution of the amino acid in chloroform containing the coupling agent dicyclohexylcarbodiimide(DCC). (chromatography-online.org)
  • This type of separation technique is also used in steroids, amino acids, dyes and pharmaceutical intermediates. (column-chromatography.com)
  • HPTLC
  • Separation of both these drugs were achieved on aluminum backed silica gel 60 RP-18 F 254 S HPTLC plates, prewashed with methanol using methanol: toluene: ammonia (7:3:0.5 v/v) as mobile phase. (scielo.cl)
  • To better separate and quantify the amount of violacein and deoxyviolacein, samples were further analyzed by HPTLC and mass spectroscopy. (igem.org)
  • Quantitative determination of violacein and deoxyviolacein in the samples (ethyl-acetate extracts) was performed by TLC on 10cm×20cm HPTLC silica gel 60 plates (Merck, Darmstadt, Germany). (igem.org)
  • packings
  • In addition to stabilizing the bed when packed, the system allows the rapid packing and unpacking of media which can range from gel packings such as cross linked agaroses to 8 m m silica. (chromatography-online.org)
  • aluminum
  • Additionally, the byproducts of our process include silica gel, aluminum oxide, and other metal oxides of commercial value, making the overall process profitable and economical. (phys.org)
  • techniques
  • Solid-phase techniques are one solution to provide great advantages with respect to compound separation and have also proven to be effective for automated synthesis and combinatorial chemistry. (intechopen.com)
  • Not until 1975 was "ion chromatography" established as a name in reference to the techniques, and was thereafter used as a name for marketing purposes. (wikipedia.org)