Selective dual-mode detection of doxycycline using orange carbon dots/calcium-murexide composite system: From spectroscopic analysis to smartphone-based sensing

IF 4.1 Q1 CHEMISTRY, ANALYTICAL
Fatma A.M. Abdel-aal , Ashraf M. Mahmoud , Azza H. Rageh , Mohamed R. Elmasry , Yousef A. Bin Jardan , Mohamed M. El-Wekil , Al-Montaser Bellah H. Ali
{"title":"Selective dual-mode detection of doxycycline using orange carbon dots/calcium-murexide composite system: From spectroscopic analysis to smartphone-based sensing","authors":"Fatma A.M. Abdel-aal ,&nbsp;Ashraf M. Mahmoud ,&nbsp;Azza H. Rageh ,&nbsp;Mohamed R. Elmasry ,&nbsp;Yousef A. Bin Jardan ,&nbsp;Mohamed M. El-Wekil ,&nbsp;Al-Montaser Bellah H. Ali","doi":"10.1016/j.talo.2025.100438","DOIUrl":null,"url":null,"abstract":"<div><div>A novel and selective analytical method has been developed for doxycycline (DOX) determination, addressing the critical need for monitoring this widely used antibiotic in environmental samples. The method employs a hybrid sensing system combining orange-emitting carbon dots (O-CDs) with a calcium-murexide (Ca@Mu) complex, offering a unique dual-mode detection approach. Unlike conventional methods that rely on direct fluorescence quenching by DOX, which often suffer from poor selectivity, this system utilizes the competitive binding between DOX and murexide for Ca<sup>2+</sup> ions. Initially, the pink-colored Ca@Mu complex formed under alkaline conditions causes fluorescence quenching of O-CDs at 552 nm. Upon introduction of DOX, its stronger Ca<sup>2+</sup>-binding affinity leads to the formation of a calcium-DOX complex, liberating free Mu and triggering both colorimetric (pink to orange) and fluorometric (restoration of O-CDs emission) responses. Comprehensive characterization and mechanistic investigations employing different spectroscopic techniques confirmed the sensing mechanism. The method demonstrates excellent selectivity for DOX among other tetracyclines and potential interferents, along with impressive analytical performance including good linearity (1.0-35.0 μM), low detection limit (325 nM), and high precision. Additionally, a smartphone-based colorimetric platform was developed for convenient on-site analysis. The practical utility of this method was validated through successful determination of DOX in environmental water samples with excellent recovery rates, offering a reliable and user-friendly approach for environmental monitoring of this important antibiotic.</div></div>","PeriodicalId":436,"journal":{"name":"Talanta Open","volume":"11 ","pages":"Article 100438"},"PeriodicalIF":4.1000,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Talanta Open","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2666831925000402","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
引用次数: 0

Abstract

A novel and selective analytical method has been developed for doxycycline (DOX) determination, addressing the critical need for monitoring this widely used antibiotic in environmental samples. The method employs a hybrid sensing system combining orange-emitting carbon dots (O-CDs) with a calcium-murexide (Ca@Mu) complex, offering a unique dual-mode detection approach. Unlike conventional methods that rely on direct fluorescence quenching by DOX, which often suffer from poor selectivity, this system utilizes the competitive binding between DOX and murexide for Ca2+ ions. Initially, the pink-colored Ca@Mu complex formed under alkaline conditions causes fluorescence quenching of O-CDs at 552 nm. Upon introduction of DOX, its stronger Ca2+-binding affinity leads to the formation of a calcium-DOX complex, liberating free Mu and triggering both colorimetric (pink to orange) and fluorometric (restoration of O-CDs emission) responses. Comprehensive characterization and mechanistic investigations employing different spectroscopic techniques confirmed the sensing mechanism. The method demonstrates excellent selectivity for DOX among other tetracyclines and potential interferents, along with impressive analytical performance including good linearity (1.0-35.0 μM), low detection limit (325 nM), and high precision. Additionally, a smartphone-based colorimetric platform was developed for convenient on-site analysis. The practical utility of this method was validated through successful determination of DOX in environmental water samples with excellent recovery rates, offering a reliable and user-friendly approach for environmental monitoring of this important antibiotic.
橙碳点/氧化钙复合体系选择性双模检测强力霉素:从光谱分析到智能手机传感
一种新的、选择性的多西环素(DOX)测定分析方法,解决了在环境样品中监测这种广泛使用的抗生素的迫切需求。该方法采用一种混合传感系统,将橙色发射碳点(O-CDs)与氧化钙(Ca@Mu)配合物结合在一起,提供了一种独特的双模式检测方法。与依赖DOX直接荧光猝灭的传统方法不同,这种方法通常具有较差的选择性,该系统利用DOX和mureoxide之间对Ca2+离子的竞争结合。最初,在碱性条件下形成的粉红色Ca@Mu配合物导致O-CDs在552nm处荧光猝灭。在引入DOX后,其更强的Ca2+结合亲和力导致钙-DOX复合物的形成,释放游离Mu并触发比色(粉红色到橙色)和荧光(恢复O-CDs发射)响应。综合表征和机理研究采用不同的光谱技术证实了传感机制。该方法对DOX在其他四环素和潜在干扰物中具有良好的选择性,具有良好的线性度(1.0 ~ 35.0 μM)、低检出限(325 nM)和高精度。此外,还开发了一个基于智能手机的比色平台,方便现场分析。通过成功测定环境水样中的DOX,验证了该方法的实用性,回收率高,为这种重要抗生素的环境监测提供了一种可靠且用户友好的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Talanta Open
Talanta Open Chemistry-Analytical Chemistry
CiteScore
5.20
自引率
0.00%
发文量
86
审稿时长
49 days
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信