Measurement of DNA adducts using surface-enhanced Raman spectroscopy

Journal Article · Fri Jan 01 00:00:00 EST 1993 · Journal of Toxicology and Environmental Health; (United States)

DOI:https://doi.org/10.1080/15287399309531787· OSTI ID:6976005

Helmenstine, A; Uziel, M; Vo-Dinh, T ^[1]

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1. Oak Ridge National Lab., TN (United States)

Hazardous pollutants emitted from energy-related technologies, chemical industries, or waste materials are of increasing public concern because of their potential adverse health effects. Many pollutants have chemical groups of toxicological importance that can be characterized and detected by Raman spectroscopy. Raman spectroscopy, however, has not been widely used in trace organic detection, even though the information contained in a Raman spectrum is valuable for chemical identification. One limitation of conventional Raman spectroscopy is its low sensitivity, which often necessitates the use of powerful and costly laser sources for sample excitation. Raman spectroscopists have recently been able to analyze dilute biological samples as a result of enhancements in the Raman scattering cross section by factors up to 10[sup 10] when a compound is adsorbed on or near a special electron-conducting surface. These spectacular enhancement factors of the normally weak Raman scattering process help overcome the low sensitivity of Raman spectroscopy through a combination of electromagnetic and chemical interactions between the analyte molecule and the surface. The technique associated with this phenomenon is known as surface-enhanced Raman scattering spectroscopy (SERS). The special conductive surface responsible for the scattering enhancement is referred to as a SERS substrate. For the past few years we have developed the SERS technique, using practical SERS-active substrate materials based on silver-coated microspheres deposited on glass. A wide variety of biomarkers have been investigated, including benzo[a]pyrene, dibenz[a,h]anthracene epoxides, 1, N[sup 9]-ethenoadenine, 3, N[sup 4]-ethenocytosine, and other substances. The experimental results are of great analytical interest, since these chemicals are difficult to detect by other techniques, such as luminescence spectroscopy, because of the weak luminescence quantum yields of these DNA adducts. 7 refs., 4 figs.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6976005
• Journal Information: Journal of Toxicology and Environmental Health; (United States), Vol. 40:2-3; ISSN 0098-4108
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
DNA ADDUCTS
DETECTION
RAMAN SPECTROSCOPY
FEASIBILITY STUDIES
SENSITIVITY
TOXIC MATERIALS
RADIOCHEMICAL ANALYSIS
BIOLOGICAL MARKERS
ADDUCTS
CHEMICAL ANALYSIS
HAZARDOUS MATERIALS
LASER SPECTROSCOPY
MATERIALS
QUANTITATIVE CHEMICAL ANALYSIS
SPECTROSCOPY
550200* - Biochemistry
560300 - Chemicals Metabolism & Toxicology
440102 - Radiation Instrumentation- Radiation Dosemeters