Impedimetric Approach for Estimating the Presence of Metanil Yellow in Turmeric Powder from Tunable Capacitance Measurement
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This article investigates the possibility of using electrical impedance spectroscopy (EIS) technique for detection and quantification of metanil yellow (MY) in turmeric powder. The observation is supported by ultraviolet–visible (UV–Vis) absorption spectroscopy and Fourier transform mid infrared (FT-MIR) spectroscopy. Variation of electrical parameters like capacitance, impedance, conductance, and current–voltage (I–V) characteristics for pure as well as adulterated turmeric are analyzed. System capacitance, conductance, and current are observed to increase, whereas the impedance values have been found to decrease with increase in MY content. Also, UV–Vis and FT-MIR spectroscopic measurements suggest the increase of absorbance with gradual increment of MY in the solution. Electrical and optical results have been physically corroborated with respect to the system internal energy. This study sought to provide a deterministic approach towards developing an EIS-based adulterant sensor for simple, rapid, economical, and precise quantification of controlled percentage weights of MY in pure turmeric powder.
KeywordsTurmeric adulteration detection Metanil yellow Effective dipole moment Electrical impedance spectroscopy UV–Vis spectroscopy
The authors would like to thank Mr. Amartya Bhattacharya for his help regarding the UV–Vis spectroscopy measurements.
Mr. C. Das likes to acknowledge the Sensor and System Development Group (UGC/338/JRF UPE-II) sponsored by UGC-UPE-II for providing the funding to pursue his research. Mr. S. Chakraborty likes to acknowledge the Department of Science and Technology (DST), Government of India for providing the INSPIRE Fellowship (IF150216) to support his research work. Lastly, the authors like to acknowledge the funding support from DST PURSE (I/005/7502), Government of India for developing the Electrical Characterization Laboratory.
Compliance with Ethical Standards
Conflict of Interest
Chirantan Das declares that he has no conflict of interest. Subhadip Chakraborty declares that he has no conflict of interest. Nirmal Kumar Bera declares that he has no conflict of interest. Krishnendu Acharya declares that he has no conflict of interest. Dipankar Chattopadhyay declares that he has no conflict of interest. Anupam Karmakar declares that he has no conflict of interest. Sanatan Chattopadhyay declares that he has no conflict of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
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