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Browsing by Author "Nacapricha D."

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A "dual-acceptor channel" membraneless gas-diffusion unit for simultaneous determination of ethanol and acetaldehyde in liquors using reverse flow injection

Choengchan N.; Poontong B.; Mathaweesansurn A.; Maneerat N.; Motomizu S.; Ratanawimarnwong N.; Nacapricha D. (2018)

A new design of membraneless gas-diffusion unit with dual acceptor channels for separation, collection and simultaneous determination of two volatile analytes in liquid sample is presented. The unit is comprised of three ...
A Multiple processing hybrid flow system for analysis of formaldehyde contamination in food

Teerasong S.; Amornthammarong N.; Grudpan K.; Teshima N.; Sakai T.; Nacapricha D.; Ratanawimarnwong N. (2010)

This work proposes a flow system suitable for the rapid screening of formaldehyde contaminated in food. The system is based on the concept of a flow analyzer with a Hantzsch reaction. An operating procedure was developed ...
A reagent-free SIA module for monitoring of sugar, color and dissolved CO2 content in soft drinks

Teerasong S.; Chan-Eam S.; Sereenonchai K.; Amornthammarong N.; Ratanawimarnwong N.; Nacapricha D. (2010)

This work presents a new sequential injection analysis (SIA) method and a module for simultaneous and real-time monitoring of three key parameters for the beverage industry, i.e., the sugar content (measured in Brix), color ...
Contactless conductivity detector from printed circuit board for paper-based analytical systems

Chantipmanee N.; Sonsa-ard T.; Fukana N.; Kotakanok K.; Mantim T.; Wilairat P.; Hauser P.C.; Nacapricha D. (2020)

This work presents a capacitively coupled contactless conductivity detector (C4D) etched out from a printed circuit board (PCB) as potential sensor for paper-based analytical systems. Two lines of any desirable pattern ...
Development of flow systems incorporating membraneless vaporization units and flow-through contactless conductivity detector for determination of dissolved ammonium and sulfide in canal water

Alahmad W.; Pluangklang T.; Mantim T.; Cerdà V.; Wilairat P.; Ratanawimarnwong N.; Nacapricha D. (2018)

Use of membraneless vaporization (MBL-VP) unit with two cone-shaped reservoirs is presented for on-line separation and detection of non-volatile species. A flow system comprising two sets of MBL-VP units with a single ...
Dual-Purpose Photometric-Conductivity Detector for Simultaneous and Sequential Measurements in Flow Analysis

Mantim T.; Chaisiwamongkhol K.; Uraisin K.; Hauser P.C.; Wilairat P.; Nacapricha D. (2020)

This work presents a new dual-purpose detector for photometric and conductivity measurements in flow-based analysis. The photometric detector is a paired emitter-detector diode (PEDD) device, whilst the conductivity detection ...
Green analytical flow method for the determination of total sulfite in wine using membraneless gas-liquid separation with contactless conductivity detection

Chantipmanee N.; Alahmad W.; Sonsa-Ard T.; Uraisin K.; Ratanawimarnwong N.; Mantim T.; Nacapricha D. (2017)

A green analytical flow method was developed for the determination of total sulfite in white wine. The method employs the membraneless vaporization (MBL-VP) technique for gas-sample separation allowing direct analysis of ...
Green analytical method for simultaneous determination of salinity, carbonate and ammoniacal nitrogen in waters using flow injection coupled dual-channel C4D

Chaneam S.; Inpota P.; Saisarai S.; Wilairat P.; Ratanawimarnwong N.; Uraisin K.; Meesiri W.; Nacapricha D. (2018)

A flow injection analysis system (FIA) for the simultaneous determination of salinity, carbonate and ammoniacal nitrogen has been developed and reported in this paper. FIA incorporating membrane units was used, not only ...
Membraneless Gas-Separation Microfluidic Paper-Based Analytical Devices for Direct Quantitation of Volatile and Nonvolatile Compounds

Phansi P.; Sumantakul S.; Wongpakdee T.; Fukana N.; Ratanawimarnwong N.; Sitanurak J.; Nacapricha D. (2016)

This work presents new chemical sensing devices called "membraneless gas-separation microfluidic paper-based analytical devices" (MBL-GS μPADs). MBL-GS μPADs were designed to make fabrication of the devices simple and ...
Microfluidic analysis with front-face fluorometric detection for the determination of total inorganic iodine in drinking water

Inpota P.; Strzelak K.; Koncki R.; Sripumkhai W.; Jeamsaksiri W.; Ratanawimarnwong N.; Wilairat P.; Choengchan N.; Chantiwas R.; Nacapricha D. (2018)

A microfluidic method with front-face fluorometric detection was developed for the determination of total inorganic iodine in drinking water. A polydimethylsiloxane (PDMS) microfluidic device was employed in conjunction ...
Microfluidic paper-based analytical device for quantification of lead using reaction band-length for identification of bullet hole and its potential for estimating firing distance

Buking S.; Saetear P.; Tiyapongpattana W.; Uraisin K.; Wilairat P.; Nacapricha D.; Ratanawimarnwong N. (2018)

A low-cost and user-friendly microfluidic paper-based analytical device (μPAD) was developed for identification of bullet hole from gunshot residue (GSR) on cotton fabric target. The device (25 × 82 mm) is made of filter ...
New membraneless vaporization unit coupled with flow systems for analysis of ethanol

Ratanawimarnwong N.; Pluangklang T.; Chysiri T.; Nacapricha D. (2013)

This work presents the development of a new design for a membraneless vaporization (MBL-VP) unit, called dual chamber MBL-VP for measurement of volatile compounds. With this unit, exact volumes of sample and reagent are ...
Paper-based colorimetric biosensor of blood alcohol with in-situ headspace separation of ethanol from whole blood

Thepchuay Y.; Sonsa-ard T.; Ratanawimarnwong N.; Auparakkitanon S.; Sitanurak J.; Nacapricha D. (2020)

This work presents a novel development that exploits the concept of in-situ gas-separation together with a specific enzymatic colorimetric detection to produce a portable biosensor called “Blood Alcohol Micro-pad” for ...
Pervaporation-flow injection with chemiluminescence detection for determination of iodide in multivitamin tablets

Nacapricha D.; Sangkarn P.; Karuwan C.; Mantim T.; Waiyawat W.; Wilairat P.; Cardwell T.; McKelvie I.D.; Ratanawimarnwong N. (2007)

This paper describes the use of a pervaporation (PV) technique in a flow injection (FI) system for selective improvement in iodide analysis. Iodide in the sample zone is oxidized to iodine, which permeates through a ...
Pulsed amperometry for anti-fouling of boron-doped diamond in electroanalysis of β-agonists: Application to flow injection for pharmaceutical analysis

Karuwan C.; Mantim T.; Chaisuwan P.; Wilairat P.; Grudpan K.; Jittangprasert P.; Einaga Y.; Chailapakul O.; Suntornsuk L.; Anurukvorakun O.; Nacapricha D. (2006)

This work presents the construction and application of boron-doped diamond (BDD) thin film electrode as sensor for the determination of three β-agonists, viz. salbutamol, terbutaline and clenbuterol. Although well-known ...
Quality control of gasohol using a micro-unit for membraneless gas diffusion

Muncharoen S.; Sitanurak J.; Tiyapongpattana W.; Choengchan N.; Ratanawimarnwong N.; Motomizu S.; Wilairat P.; Nacapricha D. (2009)

This work describes the development of a new spectrophotometric flow technique suitable for monitoring of ethanol content in gasohol fuel. Membraneless gas-diffusion (MBL-GD) was applied with one-step aqueous extraction ...
Reagent-free analytical flow methods for the soft drink industry: Efforts for environmentally friendly chemical analysis

Mantim T.; Saetear P.; Teerasong S.; Chan-Eam S.; Sereenonchai K.; Amornthammarong N.; Ratanawimarnwong N.; Wilairat P.; Meesiri W.; Uraisin K.; Nacapricha D. (2012)

The evolution of an entirely green analytical system for industrial quality control of carbonated drinks is described. The developed flow system is capable of providing analytical data of the dissolved CO 2, sucrose, and ...
Repeatability in column preparation of a reversed-phase C18 monolith and its application to separation of tocopherol homologues

Kositarat S.; Smith N.W.; Nacapricha D.; Wilairat P.; Chaisuwan P. (2011)

This work investigated the repeatability of column preparation for a reversed-phase C18 monolith, namely stearyl methacrylate-co-ethylene glycol dimethacrylate (SMA-EDMA). The columns were thermally polymerised using three ...
Sequential injection system for simultaneous determination of sucrose and phosphate in cola drinks using paired emitter-detector diode sensor

Saetear P.; Khamtau K.; Ratanawimarnwong N.; Sereenonchai K.; Nacapricha D. (2013)

This work presents the simultaneous determination of sucrose and phosphate by using sequential injection (SI) system with a low cost paired emitter-detector diode (PEDD) light sensor. The PEDD uses two 890 nm LEDs. Measurement ...
Simple and fast analysis of iohexol in human serums using micro-hydrophilic interaction liquid chromatography with monolithic column

Chaloemsuwiwattanakan T.; Sangcakul A.; Kitiyakara C.; Nacapricha D.; Wilairat P.; Chaisuwan P. (2016)

A simple and rapid method based on micro-liquid chromatography using a synthetic monolithic capillary column was developed for determination of iohexol in human serums, a marker to evaluate the glomerular filtration rate. ...

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