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Peroxynitrite, as a derivative of nitric oxide, is a potent oxidant. It reacts with several biological molecules, makes cellular and tissue damages, and is related with many diseases; therefore, it is of major concern in current medical research works. In this work, a special perm-selective cellulose acetate membrane sampler is used to implement flow injection analysis (FIA)/chemiluminscence (CL)-detection...
A chemiluminescence (CL) biosensor on a chip coupled to microfluidic system is described in this paper. The CL biosensor measured 25x45x5 mm in dimension, was readily produced in analytical laboratory. Glucose oxidase (GOD) was immobilized onto controlled-pore glass (CPG) via glutaraldehyde activation and packed into a reservoir. The analytical reagents, including luminol and ferricyanide, were electrostatically...
A chemiluminescence (CL) method for the determination of barbituric acid (BA) was proposed, which is based on the enhancement of BA to the CL intensity of Tris-(1,10-phenanthroline)ruthenium(II) (Ru(phen) 32+ )-cerium(IV) (Ce(IV)) system. The concentration of BA is proportional to the CL intensity in the range of 5.0x10 -3 -2.0 μg ml -1 . The detection limit...
A simple, sensitive and selective chemiluminescence (CL) method was developed for the determination of cysteine. This method is based on that the weak CL of cysteine oxidized with cerium (IV) can be greatly enhanced by quinine. The calibration curve was linear over the range 3.5x10 -9 -3.5x10 -6 M with a detection limit of 2.5x10 -9 M (S/N=3). The RSD was found...
A novel chemiluminescence (CL) detection scheme has been developed for detecting underivatized amino acids following capillary electrophoresis (CE) separation. This detection was based on the inhibitory effect of amino acids on the CL reaction between luminol and BrO - in alkaline aqueous solution. Detection of amino acids was accomplished with a borate-based background electrolyte at pH 9...
The presence of carbonate or Tris causes a dramatic enhancement in the cheminluminescence (CL) for the oxidation of luminol with hydrogen peroxide catalyzed by microperoxidase 8 (MP8). A nearly constant enhancement in CL was observed over a wide range of H 2 O 2 and luminol concentrations. The enhancement in CL is strongly pH-dependent, varying from 1.3 to 22.2 for carbonate and 1...
For the first time, promethazine hydrochloride chemiluminescence emission was monitored. The paper describes a new, specific and highly sensitive flow injection (FI) method for the determination of promethazine hydrochloride using both a peristaltic and a syringe pump. The method was based on the chemiluminescence emission intensity produced as a result of its oxidation reaction with permanganate...
A sensitive chemilumimetric method for the determination of novalgin at the sub-nanogram level is presented. The method is based on immobilized luminol and dichromate chemiluminescence detection coupled with a flow injection system. The intensity of the chemiluminescence can be strongly inhibited by novalgin and the decrement of CL intensity was linear with the logarithm of novalgin concentration...
Chemiluminescence detection has already been combined with different separation techniques such as HPLC and capillary electrophoresis. In this work, it was applied to gravitational field-flow fractionation, a low-cost, flow-assisted separation technique for micronsized particles suited to further on-line detection of the separated analytes. Horseradish peroxidase was used as model sample, either free...
A new FI-direct chemiluminescence method is proposed for the determination of tyrosine, based on the oxidation of the amino acid by K 3 Fe(CN) 6 in potassium hydroxide medium, at room temperature and enhanced by the presence of β-cyclodextrin and formic acid. The dynamic range was linear over the range 1.0-10.0 mgl -1 . A large study of the influence of foreign compounds...
A new, simple, clean and selective flow injection strategy based on the tandem photochemical reaction-chemiluminescence detection was applied to the determination of chloramphenicol. The determination is based on the on-line photodegradation of the drug in a glycine buffer at pH 8.8 by using a photoreactor consisting of 697 cmx0.5 mm PTFE tubing helically coiled around an 8 W low-pressure mercury...
This paper shows the influence of different sample storage protocols, on the chemiluminescence signal of some metal ions. The storage protocols studied were: acid addition (HCl or HNO 3 ) and no reagent addition to filtered and refrigerated (T=4 o C) samples. Light emission was produced for the chemiluminescence reaction between luminol and hydrogen peroxide in buffer carbonate conditions...
A paper from this laboratory 'J. Anal. Chem. 73 (2001) 4301' was recently published and dealing with the first attempt to apply molecular connectivity calculations to predict a chemical property with analytical usefulness; namely, the chemiluminescent behaviour of substances when react with common strong oxidants in liquid phase. In the present work, the usefulness of molecular topology on the search...
Combination of a novel NH 3 converter based on nanosized materials with chemiluminescence (CL) detector for the determination of NH 3 gas was demonstrated in this paper. NH 3 gas is oxidized on different nanosized catalysts to produce NO x , which can react with luminol to generate CL emission. Eight nanosized materials were investigated as catalyst, and CL was detected...
A simple, rapid and sensitive method for the determination of two fluoquinolones (FQs), enoxacin (ENX) and ofloxacin (OFLX) is described by using flow injection analysis with potassium permanganate-sodium sulfite chemiluminescence detection. The calibration graphs for ENX and OFLX are linear in the range of 8.0x10 -10 -1.0x10 -5 and 1.0x10 -9 -1.0x10 ...
A novel chemiluminescence (CL) system for automatic determination of chemical oxygen demand (COD) combined with flow injection analysis is proposed in this paper. In this system, potassium permanganate is reduced to Mn 2+ which is first adsorbed on a strongly acid cation-exchange resin mini-column to be concentrated during chemical oxidation of the organic compounds at room temperature,...
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