Monitoring of aqueous humor metabolites using Raman spectroscopy

James P. Wicksted, Roel J. Erckens, Massoud Motamedi, Wayne F. March

Research output: Contribution to journalConference article

12 Scopus citations

Abstract

Laser Raman scattering has been used to monitor glucose and lactate metabolites within aqueous humor specimens obtained from nine human eyes during cataract surgery. Nine postmortem rabbit eyes were also investigated. Raman measurements were obtained using a single grating Raman spectrometer with a liquid nitrogen cooled CCD. A 514.5 nm line from an argon laser was used to illuminate capillaries containing several microliters of aqueous humor. A water background was subtracted from each of the aqueous humor Raman spectra. This experimental system was calibrated so that each metabolite in water could be measured down to 0. 1 weight percent (wt. %). Raman peaks indicative of the stretching vibrations of methylene and methyl groups associated with glucose and lactate, respectively, were observed in the human specimens. A second stretching mode characteristic of lactate between the carbon atom and either the carboxylic acid group or carboxylate ion group was also observed providing a distinguishing feature between the glucose and lactate Raman peaks. Similar structure was observed from the rabbit specimens, but these samples have recently been found to have been contaminated during euthanasia.

Original languageEnglish (US)
Pages (from-to)264-274
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume2135
DOIs
StatePublished - May 19 1994
EventAdvances in Laser and Light Spectroscopy to Diagnose Cancer and Other Diseases 1994 - Los Angeles, United States
Duration: Jan 23 1994Jan 29 1994

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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