Das Upama, Daimari Nikhil Kumar, Islam Khairul, Biswas Rajib
Applied Optics and Photonics Research Laboratory, Department of Physics, Tezpur University, Tezpur, Assam, 784028, India.
Recent Pat Nanotechnol. 2025;19(4):535-543. doi: 10.2174/0118722105316267240807072122.
Milk contamination has been a longstanding global concern, with Heavy Metals (HM) like lead (Pb), mercury (Hg), arsenic (As), and cadmium (Cd) posing significant risks. These contaminants often infiltrate milk through contaminated water sources or during pasteurization. This petent introduces a novel approach to detecting milk contaminants by analyzing the current- voltage (I-V) characteristics of copper (Cu) electrodes modified with gold nanoparticle (AuNPs).
Leveraging the exceptional conductivity of metal nanoparticles, electrons freely traverse the surface, facilitating electron movement across the copper substrate. Additionally, the nanoparticles serve as binding agents, aiding in the comparative detection of contaminants. This method enables the preliminary detection of two HM (As, Cd) by evaluating their current gains in milk supernatant samples at varying concentrations.
AuNPs deposited on Cu electrodes exhibited a linear I-V trend, with a significant increase in current compared to bare electrodes. Spiked milk supernatant drop cast on the electrode system displayed a current gain, which was evaluated towards sensing application of HM ions in milk. The synthesized AuNPs underwent initial characterization using a UV-Vis spectrophotometer, revealing a prominent plasmonic peak around 520 nm, confirming nanoparticle formation. X-Ray Diffraction (XRD) analysis confirmed the Face-Centred Cubic (FCC) crystal structure.
Notably, different concentrations (1 and 10 ppm) and types of HM (As, Cd, Hg, and Pb) in milk supernatant yielded varying current gains, providing insights specifically targeting As and Cd contamination.
牛奶污染一直是全球长期关注的问题，铅（Pb）、汞（Hg）、砷（As）和镉（Cd）等重金属构成了重大风险。这些污染物常常通过受污染的水源或在巴氏杀菌过程中渗入牛奶。本文介绍了一种通过分析用金纳米颗粒（AuNPs）修饰的铜（Cu）电极的电流-电压（I-V）特性来检测牛奶污染物的新方法。
利用金属纳米颗粒的卓越导电性，电子可在其表面自由移动，从而促进电子在铜基底上移动。此外，纳米颗粒充当结合剂，有助于对污染物进行比较检测。该方法通过评估不同浓度牛奶上清液样品中的电流增益，能够初步检测两种重金属（As、Cd）。
沉积在铜电极上的金纳米颗粒呈现出线性I-V趋势，与裸电极相比电流显著增加。滴铸在电极系统上的加标牛奶上清液显示出电流增益，这是针对牛奶中重金属离子传感应用进行评估的。合成的金纳米颗粒首先使用紫外-可见分光光度计进行表征，在520 nm左右显示出一个突出的等离子体峰，证实了纳米颗粒的形成。X射线衍射（XRD）分析证实了面心立方（FCC）晶体结构。
值得注意的是，牛奶上清液中不同浓度（1和10 ppm）和类型的重金属（As、Cd、Hg和Pb）产生了不同的电流增益，为专门针对As和Cd污染提供了见解。
