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Calcium Carbonate Originating from Snail Shells for Synthesis of Hydroxyapatite/L-Lysine Composite: Characterization and Application to the Electroanalysis of Toluidine Blue
| Content Provider | MDPI |
|---|---|
| Author | Ngouoko, Jimmy Julio Kouanang Tajeu, Kevin Yemele Fotsop, Cyrille Ghislain Tamo, Arnaud Kamdem Doungmo, Giscard Temgoua, Ranil Clément Tonleu Kamgaing, Théophile Tonle, Ignas Kenfack |
| Copyright Year | 2022 |
| Description | Snail shells (Anadora Fulica) calcined at different temperatures were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermal analyses (TG-DTG), scanning electron microscopy (SEM) and $N_{2}$ adsorption–desorption experiments (surface area measurements were found using the coupled BET/BJH method). The principal objective was to identify different forms of calcium carbonate and calcium hydroxide in snail shells as raw materials. The calcium hydroxide thus obtained was used in the synthesis of the hydroxyapatite/L-lysine (HA/Lys) composite. The composite used to chemically modify a glassy carbon electrode (GCE) was characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It appeared that the developed sensor Lys/HA/GCE facilitated electronic transfer compared to the pristine electrode. In a strongly acid medium, this surface protonated and therefore became positively charged, which allowed it to have a good affinity with [Fe(CN)_{6}$]^{3-}$. An application in toluidine blue (TB) electroanalysis in the phosphate buffer was carried out. Optimal sensor performances were obtained using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The performance of the sensor was determined in the concentration range 1 to 10 µM of TB, and the limit of detection (LOD) obtained by the S/N = 3 method was 2.78 × $10^{−7}$ M. The sensor was also used to detect the TB in spring water at 96.79% recovery. |
| Starting Page | 1189 |
| e-ISSN | 20734352 |
| DOI | 10.3390/cryst12091189 |
| Journal | Crystals |
| Issue Number | 9 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-08-24 |
| Access Restriction | Open |
| Subject Keyword | Crystals Analytical Chemistry Spectroscopy Hydroxyapatite Electroanalysis Calcination Snail Shells Toluidine Blue |
| Content Type | Text |
| Resource Type | Article |
