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Shopping My Account Logoff My Cart Checkout Quick Find    Use CAS #, Catalog #, or keywords to find the products. Advanced Search Products dPEG®’s Amino Acids Peptides Pre-Packs Reagents/Linke… Resins Catalog Mail a Copy Download Catalog

Analytical Testing Resins Amino Acids & Derivatives Peptides NITROGEN CONTENT Substitution of amine resins and loaded resins LOSS ON DRYING Amount of residual solvent in resin FTIR Confirms Identity PARTICLE SIZE Measures size of bead MESH SIZE Bead size range and uniformity of beads SWOLLEN VOLUME Swelling of the resin in DCM solvent DIPEPTIDE CONTENT Test for dipeptide side products on loaded resins that may form in manufacture CROSSLINKING The level of linking between polymer chains. Relates to resin swelling KAISER TEST Test for unprotected Amine groups on resin OPTIONAL TESTS may attract an additional charge ELEMENT ANALYSIS Measures substitution FmPip Spectroscopic substitution measurement MOLECULAR FORMULA Empirical identity marker MOLECULAR WEIGHT Empirical identity marker FTIR Confirms identity MELTING POINT Indicates identity and purity OPTICAL ROTATION Indicates identity and purity SOLUBILITY Test for insoluble impurities, inorganic salts NMR Confirms identity TLC Test of purity HPLC Test of purity NITROGEN ASSAY Test of purity RESIDUAL SOLVENTS Residual solvents from manufacture. Purification by 1H NMR integration LOSS ON DRYING Test for residual volatile solvents WATER CONTENT Test hydrate form and residual water content OPTIONAL TESTS may attract an additional charge OPTICAL PURITY Measures amount of opposite enantiomer KAISER TEST FOR FREE AMINO ACIDS Test for unprotected amino acid impurities ELEMENTAL ANALYSIS Confirms molecular formula and purity MOLECULAR FORMULA Empirical identity marker MOLECULAR WEIGHT Empirical identity marker SEQUENCE Report of amino acid order HPLC Test purity MASS SPEC Confirms identity OPTIONAL TESTS may attract an additional charge ENDOTOXIN Level of pyrogenic substances AMINO ACID ANALYSIS Confirms identity AMINO ACID CONTENT Identifies amino acid AMINO ACID SEQUENCE Denotes order of amino acids PEPTIDE CONTENT Determines quanity of peptide in sample CE Test purity WATER CONTENT Indicates in part peptide content - mg of actual peptide in mg of product ELLMAN’S TEST Test for uncyclized cysteine side chains NMR Confirms identity pH/pl Measurement Confirms electronic state Melting Point Indicates identity and purity

Wednesday 22 February, 2012

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