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141.
Xiaochuan Li 《Tetrahedron letters》2005,46(32):5409-5412
A new photochromic compound based on the hexatriene backbone was prepared by one-step coupling. The photochromic backbone, composed of three thiophene ring, undergoes reversible ring-opening and ring-closing photoisomerization reactions when irradiated with ultraviolet and visible light, respectively. It exhibited fatigue resistance and thermally irreversible photochromic properties. The ring-open form exhibits appreciable fluorescence, while quenched by the ring-closed form. 相似文献
142.
Analysis of methyl- and ethylmercury (MM and EM) halides in biological and environmental samples is generally performed by gas chromatography with electron capture detection. Tedious sample work-up protocols and poor chromatographic response (using packed columns) have, however, shown the need for the development of new methods in this field. This paper reports a sensitive method, free from these deficiencies, for the determination of methyl- and ethylmercury. The organomercury compounds (MM and EM) are first released from the sample matrix, by the combined action of acidic potassium bromide and cupric ions, and then extracted into dichloromethane. The initial extracts are subjected to thiosulfate clean-up and the organomercury species are isolated as their chloride derivatives by addition of cupric chloride, and subsequent extraction into a small volume of organic solvent. Capillary GC coupled with atomic fluorescence detection provided excellent separation efficiencies for methyl- and ethylmercury and proved to be a very selective and sensitive technique. The absolute detection limit for both MM and EM was found to be 0.2 pg. 相似文献
143.
144.
145.
Cheikhousman R Zude M Bouveresse DJ Léger CL Rutledge DN Birlouez-Aragon I 《Analytical and bioanalytical chemistry》2005,382(6):1438-1443
The potential of fluorescence spectroscopy for characterizing the deterioration of extra virgin olive oil (EVOO) during heating was investigated. Two commercial EVOO were analysed by HPLC to determine changes in EVOO vitamin E and polyphenols as a result of heating at 170°C for 3 h. This thermal oxidation of EVOO caused an exponential decrease in hydroxytyrosol and vitamin E (R2=0.90 and 0.93, respectively) whereas the tyrosol content was relatively stable. At the same time, amounts of preformed hydroperoxides (ROOH), analysed by an indirect colorimetric method, decreased exponentially during the heating process (R2=0.94), as a result of their degradation into secondary peroxidation products. Fluorescence excitation spectra with emission at 330 and 450 nm were recorded to monitor polyphenols and vitamin E evolution and ROOH degradation, respectively. Partial least-squares calibration models were built to predict these indicators of EVOO quality from oil fluorescence spectra. A global approach was then proposed to monitor the heat charge from the overall fluorescence fingerprint. Different data pretreatment methods were tested. This study indicates that fluorescence spectroscopy is a promising, rapid, and cost-effective approach for evaluating the quality of heat-treated EVOO, and is an alternative to time-consuming conventional analyses. In future work, calibration models will be developed using a wide range of EVOO samples. 相似文献
146.
Protease sensors for bioimaging 总被引:2,自引:0,他引:2
Optical imaging of specific molecular targets and pathways in vivo has recently become possible through continued developments in imaging equipment, reconstruction algorithms, and more importantly the availability of imaging reporter molecules. These reporter molecules encompass photoproteins expressed in vivo and exogenously administered probes detectable by fluorescence and/or bioluminescence imaging. One particularly enticing aspect of optical imaging is the ability to design activatible probes with inherent amplification. This review summarizes our experience in developing novel near-infrared fluorescent (NIRF) imaging agents that report on protease activities. These agents are designed to be biocompatible, highly activatible, and able to produce bright NIRF following protease cleavage. 相似文献
147.
Christel Hempen 《Analytica chimica acta》2004,521(2):117-122
A detection scheme for the simultaneous evaluation of two bioassays based on fluorescence spectroscopy is presented. For the determination of hydrogen peroxide-generating enzymes or peroxidases, the non-fluorescent 4-(N-methylhydrazino)-7-nitro-2,1,3-benzooxadiazole (MNBDH) is converted to the strongly fluorescent 4-(N-methylamino)-7-nitro-2,1,3-benzooxadiazole (MNBDA). Phosphatases are detected based on the cleavage of the non-fluorescent 5-fluorosalicyl phosphate (5-FSAP) under formation of the fluorescent 5-fluorosalicylic acid (5-FSA). While excitation of the fluorophores may be carried out at the same wavelength, their emission spectra differ significantly. This allows the read-out of both assays using commercially available microplate readers without additional chemometric tools. Compared with individual assays, limits of detection are similar, and linearity of the calibration functions for both enzymes is observed over 2-3 concentration decades starting at the limit of quantification. The simultaneous determination of glucose oxidase and acid phosphatase in honey is presented as example for the application of the detection scheme. 相似文献
148.
Gold nanoparticles in polyelectrolyte multilayers film can be easily prepared by repeating immersion of a substrate in poly(diallyl dimethylammonium) chloride (PDDA)-AuCl4− complexes solution followed by reduction Au3+ through heating. UV-vis spectroscopy, cyclic voltammetry (CV) and tapping-mode atomic force microscopy (AFM) are used to confirm the successful construction of the polyelectrolyte multilayers film and the formation of gold nanoparticles. The multilayers film shows electrocatalytic activity to dioxygen reduction. 相似文献
149.
Llorent-Martínez EJ Ortega-Barrales P Molina-Díaz A 《Analytical and bioanalytical chemistry》2005,383(5):797-803
Multicommutation implemented with flow-through optosensors is a very promising area of research. This recent approach benefits
from the advantages of both methods and results in high sensitivity, selectivity, and speed, and little waste generation.
This paper reports the simultaneous determination of furosemide and triamterene, two widely used diuretics, by measurement
of their native fluorescence. The system has been proved to be useful for determination of both analytes in pharmaceutical
preparations and for determination of triamterene in human urine and serum. A minicolumn filled with Sephadex SPC-25 microbeads
was used to achieve separation of both analytes before detection in a flow-through cell filled with the same resin. The sensor
is linear in the range 50–1200 and 0.4–8 ng mL−1 with detection limits of 15 and 0.1 ng mL−1 for furosemide and triamterene, respectively. 相似文献
150.