Smartphone-assisted colorimetric detection of arsenic using Co-functionalized silver nanoparticles in agarose gel matrix

IF 3.4 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society Pub Date : 2025-09-02 DOI:10.1016/j.jics.2025.102089

M. Yashini , Ayush Kumar Singh , K.N. Sheeba , Paramasivam Suresh Kumar , Haritha CI

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Abstract

A novel colorimetric sensor for the sensitive and rapid detection of arsenic ions (As³⁺) was developed using starch and citrate co-functionalized silver nanoparticles embedded into an agarose gel matrix (SC–AgNP/AG Gel). The SC-AgNP/AG gel was synthesized, and their characteristics analysis such as UV, SEM, XRD, and FTIR were extensively studied. Upon exposure to arsenic, the color response of the sensor changed from yellowish-brown to reddish, facilitating visual identification without the need for complex equipment. Smartphone-based colorimetric detection demonstrated a linear response in the concentration range of 0–50 ppm and a detection limit of 1.11 ppm. Validation of sensor was conducted using Atomic absorption spectroscopy and the results showed a significant correlation coefficient (R² = 0.97). The sensor exhibited an excellent selectivity to As³⁺, stability up to 30 days at 4 °C, sensitivity and reproducibility. SC-AgNP/AG gel was found to benefit in the practical applications such as environmental monitoring and food safety due to its simplicity, stability and ease of operation.

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琼脂糖凝胶基质中协同功能化银纳米粒子的智能手机辅助比色法检测砷

将淀粉和柠檬酸盐共功能化的银纳米颗粒包埋在琼脂糖凝胶基质（SC-AgNP /AG gel）中，开发了一种灵敏快速检测砷离子（As3+）的新型比色传感器。合成了SC-AgNP/AG凝胶，并对其进行了紫外、扫描电镜、XRD、FTIR等表征分析。接触砷后，传感器的颜色响应从黄褐色变为红色，无需复杂的设备即可进行视觉识别。基于智能手机的比色检测在0-50 ppm的浓度范围内呈线性响应，检测限为1.11 ppm。采用原子吸收光谱法对传感器进行验证，结果显示相关系数显著（R2 = 0.97）。该传感器对As3+具有优异的选择性，在4°C下可保持30天的稳定性，灵敏度高，重复性好。SC-AgNP/AG凝胶因其简单、稳定和易于操作而在环境监测和食品安全等实际应用中受益。

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来源期刊

Journal of the Indian Chemical Society 化学-化学综合

CiteScore

3.50

自引率

7.70%

发文量

492

审稿时长

3-8 weeks

期刊介绍： The Journal of the Indian Chemical Society publishes original, fundamental, theorical, experimental research work of highest quality in all areas of chemistry, biochemistry, medicinal chemistry, electrochemistry, agrochemistry, chemical engineering and technology, food chemistry, environmental chemistry, etc.