Near-infrared Light Emission from Nanomolar-level Singlet Molecular Oxygen Generated with an Ultra low Concentration Mixture of Hypochlorite and Hydrogen Peroxide

Autor:	Katsuko Kakinuma, Takuo Shiraishi, Humio Inaba, Makiuchi Masao
Rok vydání:	1998
Předmět:	Range (particle radiation) Singlet molecular oxygen Analytical chemistry Hypochlorite General Medicine Photochemistry Biochemistry Emission intensity chemistry.chemical_compound Wavelength Reaction rate constant chemistry Light emission Physical and Theoretical Chemistry Hydrogen peroxide
Zdroj:	Photochemistry and Photobiology. 68:16-19
ISSN:	1751-1097 0031-8655
DOI:	10.1111/j.1751-1097.1998.tb03246.x
Popis:	— We report the detection of a weak near-infrared light emission originating from 8 nM singlet molecular oxygen (1O2) produced in a mixture of 1 mM hypochlorite (OC1-) and 8 nM hydrogen peroxide (H2O2). The measurements were made with a highly sensitive detection system for ultraweak light emission in the 1.0-1.5 μm wavelength region. The emission intensity exhibited linear dependence for H2O2 concentrations in the range of 8-670 nM. The mixture containing a lower concentration (33 μM) of OCl- pseudocontinuously emitted near-infrared light for 5 s. The rate constant for 1O2 production obtained from the kinetic analysis agrees with that previously reported. Our results demonstrate the possibility of measuring very low concentrations of 1O2 in a OCi-/H2O2 mixture as well as 1O2 production in intact living systems.
Databáze:	OpenAIRE
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