The document introduces a fast, convenient, and cost-effective preparative method development that can be achieved by scaling up from analytical HPLC separation conditions. The peak shape and separation of three antibiotics - dicloxacillan, cloxacillan, and oxacillan - are evaluated on four different ZORBAX bonded-phase selectivities, and the best separation method is scaled up in a linear manner to a 21.2 × 150 mm, 5 µm, ZORBAX PrepHT Eclipse XDB-C18 preparative column. When following the suggested easy scale-up procedure, the preparative separation results provide high yields with excellent throughput and purity.
This document details a method for scaling up preparative HPLC separations of three antibiotics (dicloxacillin, cloxacillin, and oxacillin) from analytical to preparative columns. The authors demonstrate that scaling up from analytical ZORBAX bonded-phase columns to the ZORBAX PrepHT Eclipse XDB-C18 preparative column allows for efficient method development with excellent yield, purity, and throughput.
The text provides specific guidelines for scaling up, including formulas to calculate flow rate and injection volume based on column dimensions. It compares different bonded-phase selectivities and presents chromatographic data showing the separation of the target compounds on both analytical and preparative scales.
| Analytical Flow Rate | 1 mL/min |
|---|---|
| Preparative Flow Rate | 21.2 mL/min |
| Detection Wavelength | 254 nm |
| Mobile Phase A | 65% 0.1% Trifluoroacetic acid (TFA) |
| Mobile Phase B | 35% ACN +0.1% TFA |
The sample load should be scaled in proportion to the column volume in both mass load and volume load.
The analytical and preparative column lengths should be identical, making the ratio equal to one.