相关实验视频

Updated: Jul 21, 2025

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography

Published on: January 17, 2020

开发一种灵敏的SERS方法,用于使用卡比马逆位反应在茶中的六价的无标签检测

Limei Yin¹, Heera Jayan², Jianrong Cai¹

¹Key Laboratory of Modern Agricultural Equipment and Technology of Ministry of Education, School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China.

Foods (Basel, Switzerland)

|July 29, 2023

概括

使用金银纳米粒子的新方法检测了茶中的有毒六价 (Cr6+). 这种敏感表面增强拉曼光谱 (SERS) 技术确保了更安全的茶饮.

科学领域:

分析化学分析化学
环境科学环境科学
材料科学材料科学材料科学

背景情况:

茶叶植物从受污染的环境中积累有毒的六价 (Cr6+).
通过茶叶过度摄入Cr6+对人类健康构成重大风险.
精确检测茶中的Cr6+对公共健康和安全至关重要.

研究的目的:

开发一种敏感和选择性的方法来确定茶样中的Cr6+.
使用表面增强的拉曼光谱法 (SERS) 与新型纳米粒子用于Cr6+检测.
建立一种可靠的分析技术,用于监测茶叶中的Cr6+污染.

主要方法:

制造的金银核心外纳米粒子 (Au@AgNPs) 功能化与carbimazole.
利用Cr6+和carbimazole之间的还氧反应来产生信号.
使用SERS通过监测Raman强度在595cm-1的变化来量化Cr6.
将SERS结果与标准的感应合等离子体质谱法 (ICP-MS) 方法进行比较.

主要成果:

碳醇功能化的Au@AgNP对Cr6+具有很高的选择性.
在Cr6+度和拉曼强度的对数之间观察到一个线性关系.
在茶样中,Cr⁶⁺的低检测极限 (0.945 mg/kg) 已实现.
该SERS方法显示高特异性,即使在其他金属离子的存在.

结论:

成功开发了一种可靠而敏感的SERS方法,用于在茶中确定Cr6+.
功能化的Au@AgNP为选择性Cr6+检测提供了有效的基质.
已建立的SERS技术适用于茶叶中Cr6+的实际监测,提供与ICP-MS相似的结果.

关键词:

在Au@Ag纳米粒子.在SERS检测中检测到SERS.碳二醇的水解剂污染是因为污染.茶样茶样茶样茶样

更多相关视频

Source and Route of Pyrrolizidine Alkaloid Contamination in Tea Samples

Source and Route of Pyrrolizidine Alkaloid Contamination in Tea Samples

Published on: September 28, 2022

ELIME Enzyme Linked Immuno Magnetic Electrochemical Method for Mycotoxin Detection

ELIME Enzyme Linked Immuno Magnetic Electrochemical Method for Mycotoxin Detection

Published on: October 23, 2009

相关概念视频

Redox Titration: Other Oxidizing and Reducing Agents

Redox Titration: Other Oxidizing and Reducing Agents

Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...

Redox Titration: Overview

Redox Titration: Overview

Redox titration is a chemical analysis technique used to determine the concentration of an unknown substance by measuring the electron transfer in a redox (reduction-oxidation) reaction. The process involves gradually adding a titrant with a known concentration of an oxidizing or reducing agent, to the analyte, the solution with an unknown concentration, until reaching the endpoint, which indicates the completion of the reaction between the two substances. Ensuring the analyte is in a single...