|Molecular Weight||90.078 g/mol|
Lactic acid (milk acid) is natural organic acid that plays an important role in biochemical processes. It has carboxylic and hydroxy-groups which upon standing can react with each other and forms dimers, trimers and higher oligomers. Lactic acid is a polar molecule that produces no retention on reversed-phase column. Primesep B2 mixed-mode anion-exchange column is used for separation of lactic acid and its oligomers by combination of weak reversed-phase and anion-exchange mechanisms. Oligomers of lactic acid can be converted to lactic acid by hydrolysis. Primesep B2 column can be used for analysis of lactic acid alone and lactic acid in the mixture of oligomers. Lactates can be monitored by low UV, ELSD or LC/MS. In case of ELSD, CAD or LC/MS, phosphoric acid in the mobile phase needs to be replaced with buffer compatible with these detection techniques (ammonium formate or TFA).
Lactic acid (milk acid) is a hydrophilic acid which plays important role in many bioprocesses. Lactic acid has a tendency to self-condense to form dimers, trimers and high molecular weight oligomers. Lactic acid and it’s oligomers are retained by a combination of weak reversed-phase and weak anion-exchange mechanisms on Primesep D mixed-mode HPLC column. Retention time is controlled by amount of acetonitrile, buffer concentration and buffer pH. Method is compatible with LC/MS and other detection techniques and can be used for analysis of lactic acid in various matrices.