A Novel High Selective Colorimetric Chemosensor for Determination of Copper in Food Samples: Visual Detection

• Published in: ChemistrySelect (Weinheim) Vol. 5; no. 43; pp. 13690 - 13693
• Main Authors: Mohammadnejad, Masoumeh, Shiri, Morteza, Heydari, Masumeh, Faghihi, Zeinab, Afshinpoor, Leila
• Format: Journal Article
• Language: English
• Published: 20.11.2020
• Subjects: Colorimetric sensors; Copper; Food sample; Rhodamine B derivatives
• ISSN: 2365-6549; 2365-6549
• DOI: 10.1002/slct.202003364

Rhodamine B hydrazide and 2‐chloroquinoline‐3‐carbaldehyde derivatives were used to synthesize novel colorimetric sensors for highly selective detection of copper ion. The measurement was based on the interaction between the synthesized ligands and Cu2+ and the sharp color change of the ligand from yellow to pink in the presence of Cu2+. Increase in absorbance intensity at the new appeared absorbance peak was used as an analytical signal. The effect of parameters, such as time and sensor concentration were also investigated and discussed. The calibration curve was considered too under the optimum experimental conditions and was linear in the range 0.05–5.00 μg mL−1 with a limit of detection 0.016 μg mL−1. The interferences of some common ions were studied and the synthetic ligand was found to be a high selective sensor. Selectivity of the proposed method makes it as an applicable technique for the determination of copper in foodstuff samples. Synthesis of rhodamine based ligand by Rhodamine B hydrazide and 2‐chloroquinoline‐3‐carbaldehyde derivatives was studied and the product was employed as a novel colorimetric sensor for highly selective detection of copper ion. Sharp ligand color change and increase in absorbance intensity was used as an analytical signal for sensitive determination of copper in low level. The synthetic ligand was applied for determination of copper in food samples successfully.