Broadband cavity enhanced absorption spectroscopy as a detector for HPLC

L. Nitin Seetohul, Zulfiqur Ali, Meez Islam

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


The first demonstration of a cavity enhanced absorption spectroscopy (CEAS) based technique, applied to HPLC detection is reported. Broadband cavity enhanced absorption spectroscopy (BBCEAS) has been used for detection in a HPLC system (HPLC-BBCEAS). Measurements were made on the dyes rhodamine 6G and rhodamine B between 450 and 600 nm. The sensitivity of the measurements as determined by the minimum detectable change in the absorption coefficient, αmin, were 2.9 × 10-5 cm-1 at 527 nm and 1.9 × 10-5 cm-1 at 556 nm, the peak absorption wavelengths of rhodamine 6G and rhodamine B, respectively. The limits of detection (LOD) for the two dyes were 426 and 271 pM, respectively. The LOD of the HPLC-BBCEAS setup was found to be between 54 and 77 times lower than with a Perkin-Elmer HPLC (series 200) comprising a 200EP photodiode array detector. The sensitivity of the developed setup also compared favorably with the previous single wavelength HPLC-CRDS studies while using a considerably lower cost experimental setup and simpler experimental methodology. The use of BBCEAS detection also allowed the discrimination following an isocratic HPLC separation of the nearly co-eluting dyes rhodamine 6G and rhodamine B.

Original languageEnglish
Pages (from-to)4106-4112
Number of pages7
JournalAnalytical Chemistry
Issue number10
Publication statusPublished - 15 May 2009


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