A novel HPLC flow cell integrated UV light emitting diode induced fluorescence detector as alternative for sensitive determination of aflatoxins

2018 ◽  
Vol 1033 ◽  
pp. 81-86 ◽  
Author(s):  
Xuhui Geng ◽  
Nan Wang ◽  
Yan Gao ◽  
Haijing Ning ◽  
Yafeng Guan
Keyword(s):  
Uv Light ◽  
Light Emitting Diode ◽  
Flow Cell ◽  
Fluorescence Detector ◽  
Light Emitting ◽  
Sensitive Determination

Sensitive determination of l-hydroxyproline in dairy products by capillary electrophoresis with in-capillary optical fiber light-emitting diode-induced fluorescence detection

2018 ◽  
Vol 10 (19) ◽  
pp. 2211-2216 ◽  
Author(s):  
Hongyun Ji ◽  
Xueyan Zhang ◽  
Feng Yang ◽  
Jiali Wang ◽  
Hongyan Yuan ◽  
...  
Keyword(s):  
Capillary Electrophoresis ◽  
Optical Fiber ◽  
Fluorescence Detection ◽  
Dairy Products ◽  
Light Emitting Diode ◽  
Electrophoretic Method ◽  
Light Emitting ◽  
Sensitive Determination ◽  
Capillary Electrophoretic

A sensitive capillary electrophoretic method with in-capillary optical fiber light-emitting diode-induced fluorescence detection (ICOF-LED-IFD-CE) was developed for determination of l-Hyp and further for identification of hydrolyzed leather proteins in dairy products.

Sensitive determination of carbohydrates labelled withp-nitroaniline by capillary electrophoresis with photometric detection using a 406 nm light-emitting diode

2006 ◽  
Vol 27 (20) ◽  
pp. 4039-4046 ◽  
Author(s):  
Fariborz Momenbeik ◽  
Cameron Johns ◽  
Michael C. Breadmore ◽  
Emily F. Hilder ◽  
Miroslav Macka ◽  
...  
Keyword(s):  
Capillary Electrophoresis ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Photometric Detection ◽  
Sensitive Determination

A glycerol assisted light-emitting diode-induced fluorescence detector for capillary flow systems

Talanta ◽  
2008 ◽  
Vol 75 (4) ◽  
pp. 885-889 ◽  
Author(s):  
Jing Xu ◽  
Shiheng Chen ◽  
Yan Xiong ◽  
Bingcheng Yang ◽  
Yafeng Guan
Keyword(s):  
Capillary Flow ◽  
Light Emitting Diode ◽  
Fluorescence Detector ◽  
Light Emitting ◽  
Flow Systems

scholarly journals Determination of 3,4,5-Trihydroxybenzoic Acid Exploiting a Visible-Light-Driven Photoelectrochemical Platform: Application in Wine and Tea Samples

2022 ◽  
Author(s):  
Kayni Lima ◽  
Ridvan Fernandes ◽  
Clenilton dos Santos ◽  
Flavio Damos ◽  
Rita de Cássia Luz
Keyword(s):  
Light Emitting Diode ◽  
Glass Slide ◽  
Experimental Conditions ◽  
Amperometric Determination ◽  
Light Emitting ◽  
Promising Tool ◽  
Visible Light Driven ◽  
Photoelectrochemical Method ◽  
Acid Determination

The present work is based on the development and application of a photoelectrochemical method for the amperometric determination of 3,4,5-trihydroxybenzoic acid in different samples. The method is based on the use of a photoelectrochemical platform based on a glass slide coated with fluorine-doped tin oxide, which has been modified with cadmium sulfide and poly(D-glucosamine) and subjected to a light-emitting diode (LED) lamp. The photoelectrochemical platform was sensitive to the increase of the concentration of the antioxidant 3,4,5-trihydroxybenzoic acid in the solution. Under the optimized experimental conditions, the photoelectrochemical method presented a linear response for a 3,4,5-trihydroxybenzoic acid concentration ranging from 0.2 up to 500 μmol L-1. The method was applied to 3,4,5-trihydroxybenzoic acid determination in samples of wines and teas with recoveries between 95.88 and 101.72%. The results obtained suggest that the developed platform is a promising tool for quantifying the 3,4,5-trihydroxybenzoic acid.

scholarly journals Determination of Dental Adhesive Composition throughout Solvent Drying and Polymerization Using ATR–FTIR Spectroscopy

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3886
Author(s):  
Arwa Almusa ◽  
António H.S. Delgado ◽  
Paul Ashley ◽  
Anne M. Young
Keyword(s):  
Light Exposure ◽  
Light Emitting Diode ◽  
Attenuated Total Reflectance ◽  
Drying Time ◽  
Light Emitting ◽  
Spectral Changes ◽  
One Step ◽  
Urethane Dimethacrylate ◽  
Kinetics Of

The of this study aim was to develop a rapid method to determine the chemical composition, solvent evaporation rates, and polymerization kinetics of dental adhesives. Single-component, acetone-containing adhesives One-Step (OS; Bisco, USA), Optibond Universal (OU; Kerr, USA), and G-Bond (GB; GC, Japan) were studied. Filler levels were determined gravimetrically. Monomers and solvents were quantified by comparing their pure Attenuated Total Reflectance-Fourier Transform Infra-Red (ATR–FTIR) spectra, summed in different ratios, with those of the adhesives. Spectral changes at 37 °C, throughout passive evaporation for 5 min, then polymerisation initiated by 20 s, and blue light emitting diode (LED) (600 mW/cm2) exposure (n = 3) were determined. Evaporation and polymerisation extent versus time and final changes were calculated using acetone (1360 cm−1) and methacrylate (1320 cm−1) peaks. OS, OU, and GB filler contents were 0, 9.6, and 5.3%. FTIR suggested OS and OU were Bis-GMA based, GB was urethane dimethacrylate (UDMA) based, and that each had a different diluent and acidic monomers and possible UDMA/acetone interactions. Furthermore, initial acetone percentages were all 40−50%. After 5 min drying, they were 0% for OS and OU but 10% for GB. Whilst OS had no water, that in OU declined from 18 to 10% and in GB from 25 to 20% upon drying. Evaporation extents were 50% of final levels at 23, 25, and 113 s for OS, OU, and GB, respectively. Polymerisation extents were all 50 and 80% of final levels before 10 and at 20 s of light exposure, respectively. Final monomer polymerisation levels were 68, 69, and 88% for OS, OU, and GB, respectively. An appreciation of initial and final adhesive chemistry is important for understanding the properties. The rates of evaporation and polymerisation provide indications of relative required drying and light cure times. UDMA/acetone interactions might explain the considerably greater drying time of GB.

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