NDLI: Hydroxyapatite/L-Lysine Composite Coating as Glassy Carbon Electrode Modifier for the Analysis and Detection of Nile Blue A

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Hydroxyapatite/L-Lysine Composite Coating as Glassy Carbon Electrode Modifier for the Analysis and Detection of Nile Blue A

Content Provider	MDPI
Author	Ngouoko, Jimmy Julio Kouanang Tajeu, Kevin Yemele Temgoua, Ranil Clément Tonleu Doungmo, Giscard Doench, Ingo Tamo, Arnaud Kamdem Kamgaing, Théophile Osorio-Madrazo, Anayancy Tonle, Ignas Kenfack
Copyright Year	2022
Description	An amperometric sensor was developed by depositing a film coating of hydroxyapatite (HA)/L-lysine (Lys) composite material on a glassy carbon electrode (GCE). It was applied for the detection of Nile blue A (NBA). Hydroxyapatite was obtained from snail shells and its structural properties before and after its combination with Lys were characterized using X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and Brunauer–Emmett–Teller (BET) surface area analyses. The coupling of Lys to HA was attributed to favorable interaction between negatively charged $-COO^{−}$ groups of Lys and divalent ions $Ca^{2+}$ of HA. Electrochemical investigations pointed out the improvement in sensitivity of the GCE/Lys/HA sensor towards the detection of NBA in solution. The dependence of the peak current and potential on the pH, scan rate, and NBA concentration was also investigated. Under optimal conditions, the GCE/Lys/HA sensor showed a good reproducibility, selectivity, and a NBA low detection limit of 5.07 × $10^{−8}$ mol $L^{−1}$. The developed HA/Lys-modified electrode was successfully applied for the detection of NBA in various water samples.
Starting Page	4262
e-ISSN	19961944
DOI	10.3390/ma15124262
Journal	Materials
Issue Number	12
Volume Number	15
Language	English
Publisher	MDPI
Publisher Date	2022-06-16
Access Restriction	Open
Subject Keyword	Materials Analytical Chemistry Hydroxyapatite Lysine Inorganic–organic Composite Glassy Carbon Electrode Electrode Coating Electrochemical Analysis Nile Blue A
Content Type	Text
Resource Type	Article

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