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Chemiluminescence System (chemiluminescence + system)
Selected AbstractsDetermination of Sudan IV in hot chilli powder with luminol/dissolved oxygen chemiluminescence systemJOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE, Issue 2 2010Lichuan Niu Abstract BACKGROUND: A green, simple and sensitive flow injection chemiluminescence (CL) procedure is proposed for the determination of Sudan dyes. The method is based on the finding that Sudan I, II, III and IV markedly enhance the CL intensity of the luminol/dissolved oxygen reaction. RESULTS: The increment in CL intensity was proportional to the concentration of Sudan I, II, III and IV, giving calibration graphs linear over the ranges 0.007,1, 0.5,30, 1,10 and 0.7,300 ng mL,1 respectively (R2 , 0.9981), with limits of detection of 0.002, 0.2, 0.3 and 0.2 ng mL,1 respectively. At a flow rate of 2 mL min,1, complete determination of Sudan dyes, including sampling and washing, could be accomplished in 40 s, with relative standard deviations of less than 5% (n = 7). CONCLUSION: The proposed method was successfully applied to the determination of Sudan IV in contaminated hot chilli powder, with recoveries ranging from 89.3 to 108.4%. The possible mechanism of enhancement of the lumininol/dissolved oxygen CL reaction by Sudan IV can be attributed to the acceleration of electron transfer. Compared with other procedures, the proposed CL method offers the highest sensitivity and the least reagent consumption for the determination of Sudan IV. Copyright © 2009 Society of Chemical Industry [source] A novel flow-injection chemiluminescence system for the determination of guanineLUMINESCENCE: THE JOURNAL OF BIOLOGICAL AND CHEMICAL LUMINESCENCE, Issue 4-5 2005Yang Mei Abstract A novel flow-injection chemiluminescence (CL) method for the determination of guanine was developed. The procedure is based on the CL reaction of guanine with hydrogen peroxide in borax buffer (pH 8.5) with Co2+ as a catalyst. The calibration graph is linear within the range of 3 × 10,7,9 × 10,5 g/mL. A detection limit of 1 × 10,7 g/mL, along with a relative standard deviation of 2.23% (3 × 10,7 g/mL guanine, n = 11), were obtained. The present procedure was applied to the measurement of guanine in urine with recoveries of 97.5,107.5%. A possible CL mechanism of the reaction system is proposed. Copyright © 2005 John Wiley & Sons, Ltd. [source] The role of triterpenoid on reactive oxygen scavenging system: Approach from the new chemiluminescence system (XYZ system)BIOFACTORS, Issue 1-4 2000Kazuyoshi Okubo Abstract We propose that the reactive oxygen species/hydrogen donor/mediator system (XYZ system) is a new chemiluminescence system for the measurement of reactive oxygen scavenging activity. By using this method, we demonstrated the role of triterpenoid on a reactive oxygen scavenging system. DDMP (2,3-dihydro-2,5-dihydroxy-6-methyl-4H-pyran-4-one) conjugated saponin from soybean, produced a low level light emission in the presence of H_2O_2 (X) and gallic acid (Y). The soybean saponin acted as a mediator (Z) on the reactive oxygen scavenging system. When comparing the data of photon emission properties of saponin with that of cholic acids, it concludes that DDMP moiety of soybean saponin plays an important role rather than the aglycon moiety in the radical scavenging system. [source] | ||||||||||