Hydroxyapatite High-Performance Liquid Chromatography: Detailed Investigations on Chromatographic Efficiencies for the Case of Plate-Like Crystals

Abstract
Earlier, hydroxyapatite (HA) high-performance liquid chromatography HPLC) using plate-like crystals was developed. With this HPLC, behaviors of both elution molarity and standard deviation of chromatographic peak are investigated as functions of (a) sample load, (b) flow rate, (c) total column length, and (d) slope of the molarity gradient of the development buffer; from these data, experimental conditions giving optimal chromatographic efficiencies are explored. On the basis of the present study, previously obtained HPLC data are reconsidered. The present study is compared with the earlier study of classical open HA columns. Finally, the data are analyzed on the basis of the chromatographic theory developed earlier, from which important information is available.

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