high selective HPLC-packings, first of all developed to analyze pharmaceutical
products, which are often very polar and strong basic. The extreme small content
of metallic ions in these packings must be pointed out. With such columns one
can work at low buffer
ES PHARM SPEZIAL bears methylalkyl groups and possesses a selectivity different
to that of UltraSep ES PHARM.
For strongly basic substances
UltraSep ES PHARM columns are available also with endcapped materials.
this manner the following main variables can be used for the optimization
of a separation:
of the alkyl chain C8/C18
ES PHARM/UltraSep ES PHARM SPEZIAL
of the eluent
the preparation of buffer solutions it is of advantage to avoid alkali ions. By
it the lifespan of the columns will be enlarged. Furthermore there will
be no blockage by precipitated salts at high concentrations of organic solvents.
Favorable is the adjustment of pH by triethylamine.
Packings are also qualified for the chromatography of many biologically
important classes of compounds, for instance peptides. An example is the