Diode Laser-Based Absorption Detector for Conventional-Size Liquid Chromatography

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A diode laser-based absorption detector is designed for conventionalsize liquid chromatography (LC). To this end, various detection setups and individual components have been evaluated. A ratioing system using a 10-mW 670-nm diode laser allowed the detection of 6 × 10-10 M mitoxantrone [signal-to-noise (S/N) = 3; N = root-mean-square (rms) noise], an anti-tumor drug, in a biological matrix without any sample cleanup. Multipass detection and intensity modulation of the excitation light did not improve the detection limit. A fiber-optic detector cell, utilizing a gradient-index lens on the light-guiding fiber, was a good and robust alternative for the standard absorption detector cell. Detection limits with the use of the diode laser-based detector are 20-fold better than those obtained with a commercial absorption detector for LC.

Keywords: Absorption detector; Diode laser; Liquid chromatography; Mitoxantrone

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702963906681

Affiliations: Department of General and Analytical Chemistry, Free University, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands

Publication date: January 1, 1996

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