Detector cell based on plastic liquid-core waveguides suitable for aqueous solutions: one-to-two decades improved detection limits in conventional-size column liquid chromatography with absorption detection

Gooijer, C.; Hoornweg, G.Ph.; Beer, Tjipke de; Bader, Arjen N.; Iperen, Dick J. van; Brinkman, U.A.Th.

doi:10.1016/s0021-9673(98)00668-2

Cited by 29 publications

(13 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Results obtained with uranine immobilized on anionicexchange resin were also considered (24). The developed procedure presented a detection limit at least two times lower (14,23,24) and a sampling rate 70-80% higher (8,16).…”

Section: Luminol-hypochlorite Systemmentioning

confidence: 99%

“…LCWs have been widely used in long pathlength spectrophotometry (8)(9)(10)(11)(12), allowing detection of species at the nmol/L range. Dasgupta et al reported that LCW can be also used for nephelometric, phosphorimetric, fluorimetric and Raman spectroscopic measurements (1,13,14), as well as coupled to capillary electrophoresis (14,15) and high-performance liquid chromatography (16). It was also shown that the utilization of LCW can improve the detection limits in CL measurements, in comparison to the attained with other flow-cell designs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A critical evaluation of a flow‐cell based on a liquid core waveguide for chemiluminescence measurements

Sanchez

Rocha

2008

Luminescence

View full text Add to dashboard Cite

Liquid-core waveguides (LCWs), devices that constrain the emitted radiation minimizing losses during the transport, are an alternative to maximize the amount of detected radiation in luminescence. In this work, the performance of a LCW flow-cell was critically evaluated for chemiluminescence measurements, by using as model the oxidation of luminol by hydrogen peroxide or hypochlorite. An analytical procedure for hypochlorite determination was also developed, with linear response in the range 0.2-3.8 mg/L (2.7-51 micromol/L), a detection limit estimated as 8 microg/L (0.64 micromol/L) at the 99.7% confidence level and luminol consumption of 50 microg/determination. The coefficients of variation were 3.3% and 1.6% for 0.4 and 1.9 mg/L ClO(-), respectively, with a sampling rate of 164 determinations/h. The procedure was applied to the analysis of Dakin's solution samples, yielding results in agreement with those obtained by iodometric titration at the 95% confidence level.

show abstract

Section: Luminol-hypochlorite Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A critical evaluation of a flow‐cell based on a liquid core waveguide for chemiluminescence measurements

Sanchez

Rocha

2008

Luminescence

View full text Add to dashboard Cite

show abstract

“…Teflon-AF-based materials are optically transparent and have refractive index (RI) of 1.29-1.31, slightly lower than the refractive index of water. Various applications such as detectors, chemical sensors, and pollution measurement systems have been developed using LCWs with Teflon AF coatings [4,[16][17][18]. However, Teflon AF has proven not to be an ideal material for many applications due to: (i) its poor adhesion to common solid substrates used for manufacturing of microfluidic chips, (ii) difficulties in chemical functionalization of the interface between Teflon AF coating and the aqueous core liquid, and (iii) low refractive index contrast which limits the fraction of photons generated within the aqueous core which can be efficiently collected and guided [9].…”

Section: Introductionmentioning

confidence: 99%

Versatile liquid-core optofluidic waveguides fabricated in hydrophobic silica aerogels by femtosecond-laser ablation

et al. 2015

View full text Add to dashboard Cite

“…They used Teflon AF 2400 as the absorption cell for the determination of several chemical species. [7] Dasgupta et al found its application is successful even for chemiluminescence. [7] Dasgupta et al found its application is successful even for chemiluminescence.…”

mentioning

confidence: 99%

Fluorometric Characteristics of a Wave‐Guide Cell with Low Refractive Index

Fujiwara

Kagoshima

Uchida

et al. 2003

Spectroscopy Letters

View full text Add to dashboard Cite

Recently, Teflon AF2400 (AF 1600, and AF 1601) was commercialized (DuPont Fluoroproducts, Wilmington, DE, U.S.A), that has a refractive index (1.29) lower than water (1.33), and which means that the waveguiding of light is possible in water. In this study, we used Teflon AF 2400 as a waveguide capillary longpath cell for fluorometry. He-Cd and Ar + lasers were used as the excitation source, at 325 nm and 514.5 nm respectively. The length of the capillary wave-guide cell was 18.70 cm. The was wound twice on a flat surface (loop diameters: 2 cm and 3 cm). The excitation was executed through the wave-guide cell and the fluorescence from the wound capillary cell wall was collected in a perpendicular direction to the loop. With excitation at 325 nm, the fluorescence intensity at 450 nm emitted from the cell wall decreased along with the increase in the refractive index of the solvent. This can be caused by attenuation of the source light due to absorption by the solvent. In our experiment, the solvent of higher refractive index has the higher absorption at 325 nm. On the other hand, the fluorescence intensity at 590 nm, with excitation at 514.5 nm, increases with increased refractive index of the solvent. This result shows that an increase in the refractive index of the solvent is preferable for maintaining the waveguiding of the source light. Here, the characteristics of fluorescence spectrometry are discussed in terms of the collection of fluorescence from the wave-guide capillary cell wall.

show abstract

Detector cell based on plastic liquid-core waveguides suitable for aqueous solutions: one-to-two decades improved detection limits in conventional-size column liquid chromatography with absorption detection

Cited by 29 publications

References 6 publications

A critical evaluation of a flow‐cell based on a liquid core waveguide for chemiluminescence measurements

A critical evaluation of a flow‐cell based on a liquid core waveguide for chemiluminescence measurements

Versatile liquid-core optofluidic waveguides fabricated in hydrophobic silica aerogels by femtosecond-laser ablation

Fluorometric Characteristics of a Wave‐Guide Cell with Low Refractive Index

Contact Info

Product

Resources

About