Please click on the thumbnails to view it in full size. Inorganic Cations Standards   Inorganic Cations in Beaverages Inorganic Cations Std. 10um capillary  Inorganic Anions Std./urine Amino Acids in Beer  Protease and Reverse Transcriptase Inhibitors © Innovative Sensor Technologies GmbH 2015 In capillary electrophoresis, small charged analytes with a high equivalent conductivity can be detected in the ppb and sub-ppb range as long as low conducting background electrolytes are used. In order to separate inorganic cations, buffers consisting of a mixture of morpholinoethanesulfonic acid (MES) and Histidin (His) at a slightly acidic pH are suitable. For anionic analytes, basic background electrolytes, such as a mixture of arginine (Arg) and sorbic acid give best results.  Contactless conductivity detection is not limited to inorganic ions. Organic ions usually exhibit a lower inherent conductivity compared with inorganic ions, however, they can be detected using indirect conductivity detection. In order to limit the baseline noise of background electrolytes with a higher conductivity, capillaries with small I.D.s, e.g. 25 µm, are used.