In the present manuscript, we fabricated screen-printed electrode based biosensor and enzymatic optical biosensor for detection of carcinogenic formaldehyde. The biosensor strip using cyclic voltammetry technique exhibited high sensitivity of 352 μA mg−1 L cm−2 with detection limit of 0.03 mg/L, and sensitivity of 0.186 Abs (mg/L)−1 with detection limit of 0.02 mg/L was obtained with optical biosensor over the concentration range of 0.01–0.5 mg/L. This electrochemical sensing result was compared with that of enzymatic optical sensing obtained with α-Fe2O3/ITO bioelectrode on the same sample, under similar environmental conditions, obtaining a high correlation (r2 = 0.988). The non-availability of biosensor for formaldehyde detection in corn as a food and feed stimulated our research efforts in this direction. The results of the study may have implications in developing a range of biosensors for the quantification of adulterants and contaminants along the whole food supply chain from farm to fork.
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We are highly grateful to Director, CSIR-National Physical Laboratory, New Delhi, India, for providing the research facilities, necessary for conducting the study.
This work was supported by the ICAR-Indian Agricultural Research Institute, New Delhi, India.
This article does not contain any studies with human participants or animals performed by any of the authors.
Informed consent was obtained from all individual participants included in the study.
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Kundu, M., Rajesh, Krishnan, P. et al. Comparative Studies of Screen-Printed Electrode Based Electrochemical Biosensor with the Optical Biosensor for Formaldehyde Detection in Corn. Food Bioprocess Technol 14, 726–738 (2021). https://doi.org/10.1007/s11947-021-02604-3
- Screen-printed electrode
- Electrochemical and optical biosensor