Investigation into the Suitability of Screen Printed Graphene-Melanin pH Sensors for use in Bacterial Culturing Applications

Background: Recently, Derris scandens, a Thai herbal medicine with anti-inflammatory activity, is widely used as beverage and supplementary food. When the traditional medicine is a choice for health therapy, the simple and reliable equipment is required to control the suitable consuming amount of the active component. Objective: To develop the electrochemical sensor for genistein determination in Derris scandens with high sensitivity and rapid operation. Methods: An in-house screen-printed electrochemical sensor consisting of a three-electrode system was developed for genistein determination. A silver/silver chloride (Ag/AgCl) reference electrode, a carbon counter electrode and a carbon working electrode were prepared on a 0.3-mm-thick plastic substrate by the screen-printing technique using conductive ink. The dimensions of each sensor were 2.5×1.0 cm. Only 50 µL of sample solution was required on this device for the determination of genistein concentration by rapid response square wave voltammetry. Results: The oxidation peak of genistein appeared with good response in acidic media at a peak potential of 0.6 V. Moreover, the signal was enhanced by modifying the conductive carbon ink with cobalt( II) phthalocyanine. Under the optimized conditions, the linear range was found to be 2.5-150 µM and the detection limit was 1.5 µM. Moreover, the small volume extraction was successfully developed without any further pre-concentration. This proposed method was applied to determine genistein in Derris scandens with satisfying results. Conclusion: The proposed method is promising as an alternative method for genistein determination with facile and fast analysis.

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Electrochemical sensing of Sudan I using the modified graphite screen-printed electrode

International Journal of Environmental & Analytical Chemistry ◽

10.1080/03067319.2020.1738418 ◽

2020 ◽

pp. 1-14

Author(s):

Somayeh Tajik ◽

Hadi Beitollahi ◽

Fariba Garkani Nejad ◽

Mohadeseh Safaei ◽

Peyman Mohammadzadeh Jahani

Keyword(s):

Electrochemical Sensing ◽

Screen Printed Electrode ◽

Sudan I ◽

Screen Printed

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Derivatization of SWCNTs with cobalt phthalocyanine residues and applications in screen printed electrodes for electrochemical detection of thiocholine

Electrochimica Acta ◽

10.1016/j.electacta.2011.01.123 ◽

2011 ◽

Vol 56 (11) ◽

pp. 3988-3995 ◽

Cited By ~ 30

Author(s):

Elena Jubete ◽

Kamila Żelechowska ◽

Oscar A. Loaiza ◽

Pedro J. Lamas ◽

Estibalitz Ochoteco ◽

...

Keyword(s):

Electrochemical Detection ◽

Cobalt Phthalocyanine ◽

Screen Printed Electrodes ◽

Screen Printed

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Voltammetric measurement of entacapone in the presence of other medicines against Parkinson’s disease by a screen-printed electrode modified with sulfur-tin oxide nanoparticles

Microchimica Acta ◽

10.1007/s00604-021-04733-0 ◽

2021 ◽

Vol 188 (3) ◽

Author(s):

Ebrahim Naghian ◽

Faezeh Shahdost-fard ◽

Mostafa Najafi ◽

Mohammad Reza Manafi ◽

Leila Torkian ◽

...

Keyword(s):

Parkinson’S Disease ◽

Parkinson's Disease ◽

Tin Oxide ◽

Oxide Nanoparticles ◽

Screen Printed Electrode ◽

Voltammetric Measurement ◽

Tin Oxide Nanoparticles ◽

Screen Printed

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Reduced drift of CMOS ISFET pH sensors using graphene sheets

IEEE Sensors Journal ◽

10.1109/jsen.2021.3074748 ◽

2021 ◽

pp. 1-1

Author(s):

Christoforos Panteli ◽

Pantelis Georgiou ◽

Kristel Fobelets

Keyword(s):

Graphene Sheets ◽

Ph Sensors

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Titanium Nitride Thin Film Based Low-Redox-Interference Potentiometric pH Sensing Electrodes

Sensors ◽

10.3390/s21010042 ◽

2020 ◽

Vol 21 (1) ◽

pp. 42

Author(s):

Shimrith Paul Shylendra ◽

Wade Lonsdale ◽

Magdalena Wajrak ◽

Mohammad Nur-E-Alam ◽

Kamal Alameh

Keyword(s):

Thin Film ◽

Titanium Nitride ◽

Orange Juice ◽

Ph Sensor ◽

Reference Electrode ◽

Cost Effective ◽

Ph Sensing ◽

Ph Sensors ◽

Potential Shift ◽

Double Junction

In this work, a solid-state potentiometric pH sensor is designed by incorporating a thin film of Radio Frequency Magnetron Sputtered (RFMS) Titanium Nitride (TiN) working electrode and a commercial Ag|AgCl|KCl double junction reference electrode. The sensor shows a linear pH slope of −59.1 mV/pH, R2 = 0.9997, a hysteresis as low as 1.2 mV, and drift below 3.9 mV/h. In addition, the redox interference performance of TiN electrodes is compared with that of Iridium Oxide (IrO2) counterparts. Experimental results show −32 mV potential shift (E0 value) in 1 mM ascorbic acid (reducing agent) for TiN electrodes, and this is significantly lower than the −114 mV potential shift of IrO2 electrodes with sub-Nernstian sensitivity. These results are most encouraging and pave the way towards the development of miniaturized, cost-effective, and robust pH sensors for difficult matrices, such as wine and fresh orange juice.

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