Optimization of post-column photolysis and electrochemical detection for the liquid chromatographic determination of 3-nitro-L-tyrosine.
A new post-column photolysis technology has been developed based on the use of a low pressure, low temperature UV lamp and TiO2 coated knitted reaction coil. As a test case the developed technique was used for the determination of 3-nitro-L-tyrosine by liquid chromatography with electrochemical detection. Different photolysis lamps and reactor tubing lengths were evaluated in terms of their effect on the separation efficiency and/or photolysis efficiency. A detection limit of 0.5 nM (10 fmol) for 3-nitro-L-tyrosine was achieved under optimized conditions, with a linear correlation coefficient of R2 = 0.9898 over a concentration range of 2-100 microM. Pre-injection photolysis of 3-nitro-L-tyrosine indicated that dihydroxyphenylalanine is the main photolysis product. In general, use of the photoreactor prior to liquid chromatography is an excellent method for exploring photodegradation products of an analyte in conjunction with the full range of available liquid chromatography detectors.
Liu
H
H
Department of Chemistry, Peking University, Beijing, China.
Duda
C T
CT
Huang
T
T
Aruda
W O
WO
Kissinger
P T
PT
D000818:Animals; D002853:Chromatography, Liquid; D004563:Electrochemistry; D008027:Light; D010782:Photolysis; D051381:Rats; D013056:Spectrophotometry, Ultraviolet; D014443:Tyrosine / Q000031:analogs & derivatives* / Q000032:analysis / Q000097:blood / Q000528:radiation effects
C002744:3-nitrotyrosine; D014443:Tyrosine