Abstract
In this paper, humic acid bonded silica (HAAS) stationary phase was prepared through the spacer of aminoalkyl silanes. The high performance liquid chromatographic behavior of several polar compounds, including four alkaloids and clenbuterol, was studied on HAAS. The effect of mobile phase variables such as organic solvent content, buffer pH, and ionic strength on their chromatographic behavior was investigated. The retention mechanism of tested compounds on the stationary phase was elucidated. The results indicate that the HAAS stationary phase behaved as hydrophilic interaction chromatographic packing, using high content organic solvent as mobile phase, and the stationary phase showed good separation selectivity for four alkaloids and clenbuterol.
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