Highly sensitive and selective colorimetric tin optode based on rhodamine B-cysteine immobilized on agarose membrane

IF 8 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2025-07-13 DOI:10.1016/j.snb.2025.138323

Elaheh Mohammadi, Mohammad Javad Khodayar, Zahra Ramezani, Mehrnoosh Moosavi, Behzad Sharif Makhmalzadeh, Mehdi Safdarian

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Abstract

An eco-friendly agarose-based optode was developed for the selective and sensitive detection of tin ions in aquatic and biological environments using UV-Vis spectroscopy. For this purpose, in a green synthesis method, cysteine was attached to rhodamine B and immobilized on an agarose membrane to prepare an optical sensor. For the first time, the agarose membranes were prepared using a specially designed homemade mold, which ensured uniform surface and dimensions, thereby significantly enhancing the reproducibility of the assays. The developed optode showed superior selectivity for tin ions over various interfering cations in an aqueous environment. The absorption studies indicated that the optode achieved its best performance at pH 4, enabling direct detection of Sn²⁺ ions within a concentration range of 0.5-25×10²ng mL^-1. Colorimetric analysis revealed a detection limit of 4.96 ng mL⁻¹ for the optode, with intra-day and inter-day relative standard deviations (RSD %) of 1.01% and 1.04%, respectively. This optode successfully determined Sn²⁺ in environmental and biological samples without matrix separation.

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琼脂糖膜固定化罗丹明b型半胱氨酸的高灵敏度、选择性比色锡光电器件

开发了一种基于琼脂糖的生态友好型光电二极管，用于紫外可见光谱法对水生和生物环境中的锡离子进行选择性和敏感检测。为此，采用绿色合成方法，将半胱氨酸附着在罗丹明B上，固定在琼脂糖膜上，制备光学传感器。首次采用特制的自制模具制备琼脂糖膜，保证了膜的表面和尺寸均匀，从而显著提高了检测的重复性。在所研制的光电器件在水环境中对锡离子的选择性优于各种干扰阳离子。吸收研究表明，该光电器件在pH为4时达到最佳性能，可以在0.5-25×102 ng mL-1的浓度范围内直接检测Sn 2 +离子。比色分析显示检测极限4.96 ng毫升⁻¹optode,盘中和inter-day相对标准偏差(RSD %)的1.01%和1.04%,分别。该光电器件在没有基质分离的情况下成功地测定了环境和生物样品中的Sn 2 +。

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.