Metal Complexes And Free Radical Toxins Produced By Pfiesteria Piscicida
Metal-containing organic toxins produced by Pfiesteria piscicida were characterized, for the first time, by corroborating data obtained from five distinct instrumental methods: nuclear magnetic resonance spectroscopy (NMR), inductively coupled plasma mass spectrometry (ICPMS), liquid chromatography particle beam glow discharge mass spectrometry (LC/PB-GDMS), electron paramagnetic resonance spectroscopy (EPR), and X-ray absorption spectroscopy (XAS). The high toxicity of the metal-containing toxins is due to metal-mediated free radical production. This mode of activity explains the toxicity of Pfiesteria, as well as previously reported difficulty in observing the molecular target, due to the ephemeral nature of radical species. The toxins are highly labile in purified form, maintaining activity for only 2-5 days before all activity is lost. The multiple toxin congeners in active extracts are also susceptible to decomposition in the presence of white light, pH variations, and prolonged heat. These findings represent the first formal isolation and characterization of a radical forming toxic organic-ligated metal complex isolated from estuarine/marine dinoflagellates. These findings add to an increased understanding regarding the active role of metals interacting with biological systems in the estuarine environment, as well as their links and implications to human health.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 953949
- Report Number(s):
- SLAC-REPRINT-2009-443; ESTHAG; TRN: US201004%%686
- Journal Information:
- Environ. Sci. Tech.41:1166,2007, Vol. 41, Issue 4; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
60 APPLIED LIFE SCIENCES
ABSORPTION SPECTROSCOPY
CHROMATOGRAPHY
COMPLEXES
DECOMPOSITION
DINOFLAGELLATE
ELECTRON SPIN RESONANCE
GLOW DISCHARGES
HEAT
LIQUIDS
MASS SPECTROSCOPY
METALS
NUCLEAR MAGNETIC RESONANCE
PARTICLE BEAMS
PLASMA
PRODUCTION
RADICALS
SPECTROSCOPY
TOXICITY
TOXINS
VARIATIONS
VISIBLE RADIATION
Other
ENV