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<p>A rapid, cost-effective, and user-friendly colorimetric method was developed for the detection of Metanil Yellow (MY) using copper nanoparticles (CuNPs) stabilized by carboxymethylcellulose. Compared to conventional techniques such as chromatography and mass spectrometry, this approach offers a practical alternative for on-site analysis without the need for complex instrumentation. FTIR, UV-Vis, XRD, FESEM, and HR-TEM techniques were used for the characterisation of the CuNPs. FESEM confirmed nanoscale particle formation, while HR-TEM revealed discrete trigonal-shaped nanoparticles with defined borders. XRD confirmed their crystalline metallic nature. In the presence of MY, CuNP formation was inhibited, resulting in agglomeration and loss of typical morphology, as evidenced by changes in SPR intensity and visible colour shifts. A strong logarithmic correlation between absorbance and MY concentration (R² = 0.9857) confirms the method’s reliability. Recovery rates ranged from 95.2% to 103.4%, indicating good accuracy with minimal matrix interference from turmeric. Intra-day and inter-day RSD% ranged from 1.8 to 3.2% and 2.1–4.5%, respectively. The method showed high sensitivity with an LOD of 0.05&#xa0;µg/mL and an LOQ of 0.15&#xa0;µg/mL. Due to its simplicity, speed, low cost, and visual readout, this CuNP-based method is well-suited for routine field screening of MY in the food samples, especially in resource-limited settings.</p>

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Detection of Metanil yellow through interference synthesis of carboxymethyl cellulose stabilized copper nanoparticles: A colorimetric approach

  • 期刊论文

  • 发表日期：

    2026年1月27日

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  • Surabhi Gupta,
  • Vandana Singh

摘要

A rapid, cost-effective, and user-friendly colorimetric method was developed for the detection of Metanil Yellow (MY) using copper nanoparticles (CuNPs) stabilized by carboxymethylcellulose. Compared to conventional techniques such as chromatography and mass spectrometry, this approach offers a practical alternative for on-site analysis without the need for complex instrumentation. FTIR, UV-Vis, XRD, FESEM, and HR-TEM techniques were used for the characterisation of the CuNPs. FESEM confirmed nanoscale particle formation, while HR-TEM revealed discrete trigonal-shaped nanoparticles with defined borders. XRD confirmed their crystalline metallic nature. In the presence of MY, CuNP formation was inhibited, resulting in agglomeration and loss of typical morphology, as evidenced by changes in SPR intensity and visible colour shifts. A strong logarithmic correlation between absorbance and MY concentration (R² = 0.9857) confirms the method’s reliability. Recovery rates ranged from 95.2% to 103.4%, indicating good accuracy with minimal matrix interference from turmeric. Intra-day and inter-day RSD% ranged from 1.8 to 3.2% and 2.1–4.5%, respectively. The method showed high sensitivity with an LOD of 0.05 µg/mL and an LOQ of 0.15 µg/mL. Due to its simplicity, speed, low cost, and visual readout, this CuNP-based method is well-suited for routine field screening of MY in the food samples, especially in resource-limited settings.