The Use of Poly(Tetrafluoroethylene-Co-Hexafluoropropylene) Tubing as a Waveguide Capillary Cell for Liquid Absorption Spectrometry

Tsunoda, Kin-ichi; Nomura, Akihiro; Yamada, Joseph; Nishi, Sueo

doi:10.1366/0003702904085949

Cited by 25 publications

(10 citation statements)

References 10 publications

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“…As a result, several promising flow injection analysis (FIA) systems including on-line sample pre-treatment and flowthrough detection have been constructed. [13][14][15] In order to increase the sensitivity in such FIA systems, some researchers have employed the liquid core waveguide as an optical cell with a long pathlength, [16][17][18] and others have applied solid-phase spectrophotometry, 19,20 in which the absorbance of analyte species adsorbed and enriched on a solid support placed inside the light path of the flow cell is directly measured.…”

Section: Introductionmentioning

confidence: 99%

Sensitive measurement of methylene blue active substances by attenuated total reflection spectrometry with a trimethylsilane-modified glass slab optical waveguide

Umemura¹,

Kasuya²,

Odake³

et al. 2001

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Attenuated total reflection spectrometry with a slab optical waveguide (SOWG) was explored for the simple, rapid and sensitive measurement of total anionic surfactants by the methylene blue active substance (MBAS) method. A fused-silica sheet used as a guiding layer was modified with trimethylsilane (TMS) to extract and concentrate the MBASs on the SOWG surface. Based on preliminary studies of the adsorption behavior and visible ATR spectrum of MB on the modified silica surface, a detection wavelength of 600 nm was chosen for the sensitive measurement of anionic surfactants. When the concentration of MB was set at 10 microM in the final measurement solution, the calibration curve for a typical anionic surfactant (sodium dodecylbenzenesulfonate) was linear up to 0.6 microM and the detection limit was 0.07 microM. The proposed method was applied to the determination of total anionic surfactants in river water.

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Section: Introductionmentioning

confidence: 99%

Sensitive measurement of methylene blue active substances by attenuated total reflection spectrometry with a trimethylsilane-modified glass slab optical waveguide

Umemura¹,

Kasuya²,

Odake³

et al. 2001

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“…12 Tsunoda et al demonstrated the application of using 45% w/w ethanol for the light-guiding device and applied it for a long path absorption measurement of tryptophan. 13 Teshima et al applied a concentrated NaOH medium as an mLCW in the FEP tube for a long path absorption measurement for the acetone determination in exhaled breath. 14 Recently, the syrup or ethanol was used as cost-effective environmentally friendly mLCW in a GD-FI system employing a butterfly pea flower extract reagent for ammonium determination.…”

Section: Introductionmentioning

confidence: 99%

A Cost-effective Liquid Core Waveguide Based on a Concentrated Acid Medium for Colorimetric Determination of Sulfide

2021

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“…The concern on insufficient sensitivity of optical measurement could be overcome by using the liquid core waveguide (LCW) technique [18][19][20]. In this technique, the cell is made of material of a smaller refractive index than that of the liquid in the cell core, which facilitates total reflection of transmitting light at the liquid core-cell wall interface.…”

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confidence: 99%

High-sensitivity Microvolume UV Absorption Spectrometry for Routine Analysis of Small-volume Biological Samples

et al. 2021

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Substantial improvement of microvolume UV absorption spectrometry in sensitivity, robustness and ease of operation was achieved for routine biological applications. A unique microtubing-based absorption cell (208 μm internal diameter) featuring enhanced light transmission with a liquid core waveguide technique provided dramatically enhanced absorption sensitivity, proportional to the extended path length (50 mm, from the typical 1 mm), while robust measurement performance was attained by implementation of preventive measures against bubble trapping along the light path. For pBR322 plasmid DNA, absorbance at 260 nm was reliably measurable down to 0.1 ng/μl with repeatability typically 2–3% RSD. The detection limit was 0.03 ng/μl dsDNA, far lower than the current state-of-the-art ∼1 ng/μl. Sample consumption for each measurement was 2.4 μl. Automated operation implemented for the first time in microvolume spectrophotometry facilitated the ease in handling with small-volume biological samples.

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The Use of Poly(Tetrafluoroethylene-Co-Hexafluoropropylene) Tubing as a Waveguide Capillary Cell for Liquid Absorption Spectrometry

Cited by 25 publications

References 10 publications

Sensitive measurement of methylene blue active substances by attenuated total reflection spectrometry with a trimethylsilane-modified glass slab optical waveguide

Sensitive measurement of methylene blue active substances by attenuated total reflection spectrometry with a trimethylsilane-modified glass slab optical waveguide

A Cost-effective Liquid Core Waveguide Based on a Concentrated Acid Medium for Colorimetric Determination of Sulfide

High-sensitivity Microvolume UV Absorption Spectrometry for Routine Analysis of Small-volume Biological Samples

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