John Ita Njagi

Thesis: Implantable (bio)sensors for in vivo monitoring of

 neurotransmitters: design, characterization and


Research: - Developing a sensitive electrochemical microbiosensors to analyze nitric oxide in brain slices  

- Design an electrochemical  enzymatic sensor for dual detection of L-glutamate and nitric oxide

- The use of ceria and mixed ceria oxides based biosensors for dopamine evaluation in oxygen restrictive environments 

- Electrochemical quantification of serotonin in the embryonic zebrafish intestine

- Design an electrochemical  enzymatic sensor for dual detection of L-glutamate and nitric oxide

- Development of stable biosensors based on chemically synthetized Au-polypyrolle nanocomposite

Awards and honors:


[9]  Electrochemical quantification of serotonin in the live embryonic zebrafish intestine

  J. Njagi, M. Ball, K.N. Wallace and S. Andreescu 

    Anal. Chem., 82(5), 2010, 1822-1830

[8]  Amperometric detection of dopamine in vivo with an enzyme based carbon fiber microbiosensor 

   J. Njagi, M.M. Chernov, J.C. Leiter and S. Andreescu

    Anal. Chem., 82(3), 2010, 989-996

[7]  A sensitive electrochemical sensor based on chitosan and electropolymerized Meldola blue for monitoring NO in brain slices 

   J. Njagi, J.S. Erlichman, J.W. Aston, J.C. Leiter, and S. Andreescu

    Sens. Actuators B Chem., 143(2), 2010, 673-680

[6]  Applications of advanced nanomaterials for environmental monitoring 

  S. Andreescu, J. Njagi, C. Ispas, and M. Ravalli

    J. Environ. Monit., 11, 2009, 27-40. (Critical review) 

(JEM Spotlight article, Top 10 most accessed articles in 2009 and 2010) 

[5]  Chapter VII - Nanostructured materials for enzyme immobilization and biosensors

S. Andreescu, J. Njagi, and C. Ispas 

in: The New Frontiers of Organic and Composite Nanotechnology,  (Eds. V. Erokin, M. K. Ram and O. Yavuz), Elsevier, 2008, 355-394

[4]  Mixed Ceria Based Metal Oxides Biosensor for Operation in Oxygen Restrictive Environments 

  J. Njagi, C. Ispas, and S. Andreescu

    Anal. Chem., 80(19), 2008, 7266-7274 

[3]  Electrochemical Studies of ceria as electrode material for sensing and biosensing applications 

  C. Ispas, J. Njagi, and S. Andreescu

    J. Electrochem. Soc., 155(8), 2008, F169-F176 

[2]  Stable enzyme biosensors based on chemically synthesized Au-polypyrrole nanocomposite 

  J. Njagi, and S. Andreescu

    Biosens. Bioelectron., 23(2), 2007, 768-775 

[1]  A Bioanalytical Chemistry Experiment for Undergraduate Students: Biosensors Based on Metal Nanoparticles 

  J. Njagi, J. Warner, and S. Andreescu

    J. Chem. Educ.,  84(7), 2007, 1180-1182


   - "Enzyme sensors for real-time monitoring of clinically important analytes with high sensitivity and low oxygen dependence"

The 238th ACS National Meeting, August 16-20, 2009, Washington, DC

- "Nanostructured hybrid microfibers for enzyme immobilization and biosensor fabrication"

Eastern Analytical Symposium (EAS), Somerset, NJ, November 13-16, 2006

-  The 240th ACS National Meeting, Boston, MA August 22-26, 2010

-  The 37th Northeast Regional Meeting, Potsdam, NY, June 2-5, 2010 

- The 238th ACS National Meeting, Washington, DC, August 16-20, 2009 

- The CAMP Annual Meeting, Canandaigua, NY, May 14, 2009 

- The 236th ACS National Meeting, Philadelphia, PA, August 17-21, 2008 

- The 35th ACS-Northeast Regional Meeting (NERM), Burlington, VT, June 29 - July 2, 2008 

- The 40th Middle Atlantic Regional Meeting, Bayside, NY, May 17–21, 2008 

- The 234th ACS National Meeting, Boston, MA, August 19-23, 2007 

- The Annual Eastern New York ACS Undergraduate Research Symposium, Saratoga Spring, NY, March 04, 2006 

John, the 1st Ph.D. student of Andreescu lab. 

August 2005, the BIOsem group was born ...

and the research has begun ...


Thesis defense: November, 2009

Committee: Profs: Silvana Andreescu, Dan Goia, Evgeny Katz, Craig Woodworth and James Leiter

Congratulation Dr. Njagi !