King Mongkut's University of Technology Thonburi (KMUTT)

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Wijitar Dungchai, Ph.D.

ดร.วิจิตรา เดือนฉาย

Associate Professor


Research Field: Analytical Chemistry, Electrochemistry

Telephone: 02-470-9553

Fax: 02-470-8843

E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Office: SCL 1002 (7)


Research Interests

Paper-based device


Pathogen determination


Research Topics

  • Metal nanoparticles for colorimetric and electrochemical sensors
  • Development of point-of-care test kit for the developing country
  • Paper-based microfluidic devices for biochemical and environmental analysis

Current Projects

  • Distance-based measurement on paper-based device for hydrogen peroxide
    อาจารย์ที่ปรึกษาโครงการ: ทุนอุดหนุนการทำกิจกรรมและสนับสนุนการวิจัย (สำนักงานการวิจัยแห่งชาติ)
  • การดัดแปรพื้นผิวกราฟีนด้วยโบรอนและไนโตรเจน เพื่อใช้ตรวจวัดทางเคมีไฟฟ้าสำหรับสารกลุ่มอะมิโน
    อาจารย์ที่ปรึกษาโครงการ: ทุนอุดหนุนการทำกิจกรรมและสนับสนุนการวิจัย (สำนักงานการวิจัยแห่งชาติ)
  • Development of paper-based device for troponin in blood
    อาจารย์ที่ปรึกษาโครงการ: ทุนเพชรพระจอมดุษฎีบัณฑิต (มจธ.)




University (Country)

Graduation Year




Chulalongkorn University (Thailand)





Chulalongkorn University (Thailand)



Visiting Experiences

3 December 2009 – 30 April 2010 (5 moths)

Place: Department of chemistry, Colorado state University, Fort Collins, Colorado, USA 
Collaboration: Prof. Charles S. Henry
Research Title: Paper-based microfluidic


1 July 2008 – 30 June 2009 (1 year)

Place: Department of chemistry, Colorado state University, Fort Collins, Colorado, USA 
Collaboration: Prof. Charles S. Henry
Research Title: Paper-based microfluidic


1 April 2007 – 20 June 2007 (2 months and 20 days)

Place: Division of Chemistry and Biochemistry, Okayama University, Okayama, Japan
Collaboration: Prof. Motomizu Shoji
Research Title: Sequential injection analysis for heavy metals analysis


1 April 2006 – 31 May 2006 (2 months)

Place: Department of Chemistry, Tsinghua University, Beijing, China
Collaboration: Prof. Jin-Ming Lin
Research Title: Chemiluminescence enzyme immunoassay for diagnosis



April 2017 – May 2019

TRF funding (MRG)


Oct 2014 – Aug 2017

TRF funding (RTA)


Jan 2011 – Jan 2012

Research funding from Science Faculty, KMUTT


Jun 2005 – 2010

The Royal Golden Jubilee Ph.D Program from Thailand Research Fund, Thailand


International Publications

  1. Khachornsakkul, K.; Dungchai, W. (2020) Development of an ultrasound-enhanced smartphone colorimetric biosensor for ultrasensitive hydrogen peroxide detection and its applications. RSC Advances, 10(41), 24463-24471.
  2. Ratnarathorn, N.; Dungchai, W. (2020) Paper-based analytical device (PAD) for the determination of borax, salicylic acid, nitrite, and nitrate by colorimetric methods. Journal of Analytical Chemistry, 75(4), 487-494.
  3. Ninwong, B.; Sangkaew, P.; Hapa, P.; Ratnarathorn, N.; Menger, R.F.; Henry, C.S.; Dungchai, W. (2020) Sensitive distance-based paper-based quantification of mercury ions using carbon nanodots and heating-based preconcentration. RSC Advances, 10(17), 9884-9893.
  4. Wonsawat, W.; Limvongjaroen, S.; Supromma, S.; Panphut, W.; Ruecha, N.; Ratnarathorn, N.; Dungchai, W. (2020) A paper-based conductive immunosensor for the determination of Salmonella TyphimuriumAnalyst, 145(13), 4637-4645.
  5. Income, K.; Ratnarathorn, N.; Khamchaiyo, N.; Srisuvo, C.; Ruckthong, L.; Dungchai, W. (2019) Disposable nonenzymatic uric acid and creatinine sensors using μPAD coupled with screen-printed reduced graphene oxide-gold nanocomposites. International Journal of Analytical Chemistry, 3457247.
  6. Income, K.; Ratnarathorn, N.; Themsirimongkon, S.; Dungchai, W. (2019) An oxalic acid sensor based on platinum/carbon black-nickel-reduced graphene oxide nanocomposites modified screen-printed carbon electrode. Journal of Electrochemical Science and Technology, 10(4), 416-423.
  7. Khatha, P.; Phutthaphongloet, T.; Timpa, P.; Ninwong, B.; Income, K.; Ratnarathorn, N.; Dungchai, W. (2019) Distance-based paper device combined with headspace extraction for determination of cyanide. Sensors, 19(10), 2340.
  8. Wicaksono, D.H.B.; Syazwani, I.N.; Ratnarathorn, N.; Sadir, S.; Shahir, S.; Ruckthong, L.; Dungchai, W.; Yuliarto, B.; Dipojono, H.K. (2019) Cotton fiber-based assay with time-based microfluidic absorption sampling for point-of-care applications. Bioanalysis, 11(9), 855-873.
  9. Jarangdet, T.; Pratumyot, K.; Srikittiwanna, K.; Dungchai, W.; Mingvanish, W.; Techakriengkrai, I.; Sukwattanasinitt, M.; Niamnont, N. (2018) A fluorometric paper-based sensor array for the discrimination of volatile organic compounds (VOCs) with novel salicylidene derivatives. Dyes and Pigments, 159, 378-383.
  10. Phoonsawat, K.; Ratnarathorn, N.; Henry, C.S.; Dungchai, W. (2018) A distance-based paper sensor for the determination of chloride ions using silver nanoparticles. Analyst, 143(16), 3867-3873.
  11. Worramongkona, P.; Seeda, K.; Phansomboon, P.; Ratnarathorn, N.; Chailapakul, O.; Dungchai, W. (2018) A simple paper-based colorimetric device for rapid and sensitive urinary oxalate determinations. Analytical Sciences, 34(1), 103-108.
  12. Ratnarathorn, N.; Chailapakul, O.; Dungchai, W. (2015) Highly sensitive colorimetric detection of lead using maleic acid functionalized gold nanoparticles. Talanta, 132, 613-618.
  13. Rattanarat, P.; Dungchai, W.; Cate, D.; Volckens, J.; Chailapakul, O.; Henry, C.S. (2014) Multilayer paper-based device for colorimetric and electrochemical quantification of metals. Analytical Chemistry, 86(7), 3555-3562.
  14. Cate, D.M.; Dungchai, W.; Cunningham, J.C.; Volckens, J.; Henry, C.S. (2013) Simple, distance-based measurement for paper analytical devices. Lab on a Chip, 13(12), 2397-2404.
  15. Dungchai, W.; Sameenoi, Y.; Chailapakul, O.; Volckens, J.; Henry, C.S. (2013) Determination of aerosol oxidative activity using silver nanoparticle aggregation on paper-based analytical devices. Analyst, 138(22), 6766-6773.
  16. Noiphung, J.; Songjaroen, T.; Dungchai, W.; Henry, C.S.; Chailapakul, O.; Laiwattanapaisal, W. (2013) Electrochemical detection of glucose from whole blood using paper-based microfluidic devices. Analytica Chimica Acta, 788, 39-45.
  17. Rattanarat, P.; Dungchai, W.; Cate, D.M.; Siangproh, W.; Volckens, J.; Chailapakul, O.; Henry, C.S. (2013) A microfluidic paper-based analytical device for rapid quantification of particulate chromium. Analytica Chimica Acta, 800, 50-55.
  18. Ninwong, B.; Chuanuwatanakul, S.; Chailapakul, O.; Dungchai, W.; Motomizu, S. (2012) On-line preconcentration and determination of lead and cadmium by sequential injection/anodic stripping voltammetry. Talanta, 96, 75-81.
  19. Preechakasedkit, P.; Pinwattana, K.; Dungchai, W.; Siangproh, W.; Chaicumpa, W.; Tongtawe, P.; Chailapakul, O. (2012) Development of a one-step immunochromatographic strip test using gold nanoparticles for the rapid detection of Salmonella typhi in human serum. Biosensors & Bioelectronics, 31(1), 562-566.
  20. Ratnarathorn, N.; Chailapakul, O.; Henry, C.S.; Dungchai, W. (2012) Simple silver nanoparticle colorimetric sensing for copper by paper-based devices. Talanta, 99, 552-557.
  21. Rattanarat, P.; Dungchai, W.; Siangproh, W.; Chailapakul, O.; Henry, C.S. (2012) Sodium dodecyl sulfate-modified electrochemical paper-based analytical device for determination of dopamine levels in biological samples. Analytica Chimica Acta, 744, 1-7.
  22. Songjaroen, T.; Dungchai, W.; Chailapakul, O.; Henry, C.S.; Laiwattanapaisal, W. (2012) Blood separation on microfluidic paper-based analytical devices. Lab on a Chip, 12(18), 3392-3398.
  23. Wonsawat, W.; Chuanuwatanakul, S.; Dungchai, W.; Punrat, E.; Motomizu, S.; Chailapakul, O. (2012) Graphene-carbon paste electrode for cadmium and lead ion monitoring in a flow-based system. Talanta, 100, 282-289.
  24. Wonsawat, W.; Dungchai, W.; Motomizu, S.; Chuanuwatanakul, S.; Chailapakui, O. (2012) Highly sensitive determination of cadmium and lead using a low-cost electrochemical flow-through cell based on a carbon paste electrode. Analytical Sciences, 28(2), 141-146.
  25. Dungchai, W.; Chailapakul, O.; Henry, C.S. (2011) A low-cost, simple, and rapid fabrication method for paper-based microfluidics using wax screen-printing. Analyst, 136(1), 77-82.
  26. Leesutthiphonchai, W.; Dungchai, W.; Siangproh, W.; Ngamrojnavanich, N.; Chailapakul, O. (2011) Selective determination of homocysteine levels in human plasma using a silver nanoparticle-based colorimetric assay. Talanta, 85(2), 870-876.
  27. Sameenoi, Y.; Mensack, M.M.; Boonsong, K.; Ewing, R.; Dungchai, W.; Chailapakul, O.; Cropek, D.M.; Henry, C.S. (2011) Poly(dimethylsiloxane) cross-linked carbon paste electrodes for microfluidic electrochemical sensing. Analyst, 136(15), 3177-3184.
  28. Siangproh, W.; Dungchai, W.; Rattanarat, P.; Chailapakul, O. (2011) Nanoparticle-based electrochemical detection in conventional and miniaturized systems and their bioanalytical applications: A review. Analytica Chimica Acta, 690(1), 10-25.
  29. Songjaroen, T.; Dungchai, W.; Chailapakul, O.; Laiwattanapaisal, W. (2011) Novel, simple and low-cost alternative method for fabrication of paper-based microfluidics by wax dipping. Talanta, 85(5), 2587-2593.
  30. Apilux, A.; Dungchai, W.; Siangproh, W.; Praphairaksit, N.; Henry, C.S.; Chailapakul, O. (2010) Lab-on-paper with dual electrochemical/colorimetric detection for simultaneous determination of gold and iron. Analytical Chemistry, 82(5), 1727-1732.
  31. Dungchai, W.; Chailapakul, O.; Henry, C.S. (2010) Use of multiple colorimetric indicators for paper-based microfluidic devices. Analytica Chimica Acta, 674(2), 227-233.
  32. Injang, U.; Noyrod, P.; Siangproh, W.; Dungchai, W.; Motomizu, S.; Chailapakul, O. (2010) Determination of trace heavy metals in herbs by sequential injection analysis-anodic stripping voltammetry using screen-printed carbon nanotubes electrodes. Analytica Chimica Acta, 668(1), 54-60.
  33. Dungchai, W.; Chailapakul, O.; Henry, C.S. (2009) Electrochemical detection for paper-based microfluidics. Analytical Chemistry, 81(14), 5821-5826.
  34. Sangjarusvichai, H.; Dungchai, W.; Siangproh, W.; Chailapakul, O. (2009) Rapid separation and highly sensitive detection methodology for sulfonamides in shrimp using a monolithic column coupled with BDD amperometric detection. Talanta, 79(4), 1036-1041.
  35. Siangproh, W.; Leesutthipornchai, W.; Dungchai, W.; Chailapakul, O. (2009) Electrochemical detection for flow-based system: A review. Journal of Flow Injection Analysis, 26(1), 5-25.
  36. Chuanuwatanakul, S.; Dungchai, W.; Chailapakul, O.; Motomizu, S. (2008) Determination of trace heavy metals by sequential injection-anodic stripping voltammetry using bismuth film screen-printed carbon electrode. Analytical Sciences, 24(5), 589-594.
  37. Dungchai, W.; Siangproh, W.; Chaicumpa, W.; Tongtawe, P.; Chailapakul, O. (2008) Salmonella typhi determination using voltammetric amplification of nanoparticles: A highly sensitive strategy for metalloimmunoassay based on a copper-enhanced gold label. Talanta, 77(2), 727-732.
  38. Dungchai, W.; Siangproh, W.; Lin, J.-M.; Chailapakul, O.; Lin, S.; Ying, X. (2007) Development of a sensitive micro-magnetic chemiluminescence enzyme immunoassay for the determination of carcinoembryonic antigen. Analytical and Bioanalytical Chemistry, 387(6), 1965-1971.