Crocheted PTFE reactors for post-column photochemistry in HPLC

Poulsen, J.C. Navarro; Birks, K. S.; Gandelman, Mitchell S.; Birks, John W.

doi:10.1007/bf02268764

Cited by 55 publications

(22 citation statements)

References 15 publications

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“…A different immersion well type FEP-capillary setup (‘inside-out’ irradiation) was recently reported but required a custom-built quartz tube [34]. Capillary-based reactors were originally developed for post-column photochemical derivatizations to enhance detection in HPLC [35–37] but are now commonly used in flow photochemical studies [5–9]. FEP is transparent above 230 nm and shows a good UV-stability [37].…”

Section: Resultsmentioning

confidence: 99%

Microflow photochemistry: UVC-induced [2 + 2]-photoadditions to furanone in a microcapillary reactor

Bachollet¹,

Terao²,

Aida³

et al. 2013

Beilstein J. Org. Chem.

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Summary[2 + 2]-Cycloadditions of cyclopentene and 2,3-dimethylbut-2-ene to furanone were investigated under continuous-flow conditions. Irradiations were conducted in a FEP-microcapillary module which was placed in a Rayonet chamber photoreactor equipped with low wattage UVC-lamps. Conversion rates and isolated yields were compared to analogue batch reactions in a quartz test tube. In all cases examined, the microcapillary reactor furnished faster conversions and improved product qualities.

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Section: Resultsmentioning

confidence: 99%

Microflow photochemistry: UVC-induced [2 + 2]-photoadditions to furanone in a microcapillary reactor

Bachollet¹,

Terao²,

Aida³

et al. 2013

Beilstein J. Org. Chem.

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“…with 0. 0.05-mm wall thickness) purchased from Small Parts, Inc., were plumbed and crocheted by the method of Poulsen et al (23). A water-filled housing was designed for use with pencil lamps that allowed the temperature of the photoreactor to be regulated by an external circulation pump while maintaining an anaerobic environment ( Figure 2).…”

Section: Methodsmentioning

confidence: 99%

Photoreduction fluorescence detection of quinones in high-performance liquid chromatography

Poulsen¹,

Birks²

1989

Anal. Chem.

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A slmple, reagent-free photochemlcai reactlon detector for quinones Including, but not ilmited to, the K vitamins is presented. Quinones are photoreduced to dihydroqulnones vla hydrogen abstraction from the hlgh-performance liquid chromatography (HPLC) moblie phase in a postcolumn photoreactor. An advantage over previous reaction-detection methods for quinones Is the slmpiiclty of thls system. No postcolumn reagent addttlon pumps are required. Additionally, the reaction Is accompilshed In a very short reactor which mlnhnlres band broadening and anatysis time. Detectlon Ihnits for many qukrone derlvatlves are In the low -ram range with good selectlvlty. I n this paper, the photochemistry of the detection scheme and its optimization for use in HPLC are discussed. As a sample appllcatlon, the detection of vitamin K, in a plant extract (Capsella bursa pasfw/us) without prefractlonatlon Is Included. A new photoreactor housing for carrying out anaeroblc reactions In low-dlsperslon, PTFE photoreactors is described.

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“…The post-column apparatus was placed between the UV detector and the electrochemical detector. The NaOH reagent at 0.6 mL min 21 was added to the eluent via a mixingtee, followed by a 250 mL, knitted, Teflon TM tubing reaction coil [19] to achieve a final solution concentration of ca. 0.1 M NaOH.…”

Section: Instrumentationmentioning

confidence: 99%

Pulsed Electrochemical Detection of Aryl‐ and Alkylglycosides Following Reversed‐Phase Liquid Chromatography

Marple

LaCourse

2004

Journal of Liquid Chromatography & Related Technologies

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Pulsed electrochemical detection (PED) coupled to reversed-phase high performance liquid chromatography is applied to the detection of aryland alkylglycosides. PED is used to detect these compounds sensitively without the need of derivatization. Detection limits using an optimized waveform are typically 80 -40 and 400-200 nM for aryl-and alkylglycosides, respectively. For arylglycosides, PED proved generally to be comparable to absorbance detection at 254 nm (300 -5 nM) and 204 nm (40 -20 nM). The advantages of PED over UV detection are highlighted for alkylglycosides, for which optical detection at 204 nm produced no analytical signal. This work is applied to the determination of a

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Crocheted PTFE reactors for post-column photochemistry in HPLC

Cited by 55 publications

References 15 publications

Microflow photochemistry: UVC-induced [2 + 2]-photoadditions to furanone in a microcapillary reactor

Microflow photochemistry: UVC-induced [2 + 2]-photoadditions to furanone in a microcapillary reactor

Photoreduction fluorescence detection of quinones in high-performance liquid chromatography

Pulsed Electrochemical Detection of Aryl‐ and Alkylglycosides Following Reversed‐Phase Liquid Chromatography

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