来自酸和尿素的碳点作为度探针,用于确定婴儿配方奶粉样本中的胺污染
Souliyanh Phimmasone1, Pornthip Boonsri1, Weena Siangproh1,2
1Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Wattana, Bangkok 10110, Thailand.
Methods and applications in fluorescence
|August 30, 2023
概括
一种新方法使用光碳点 (CD) 来检测乳制品中的胺. 这种敏感和选择性的方法准确量化了胺,确保了消费者的安全.
科学领域:
- 分析化学 分析化学
- 材料科学 材料科学 材料科学
- 食品安全 食品安全
背景情况:
- 食品中,特别是婴儿乳制品中的胺造,由于故意添加以人工膨胀蛋白质含量,造成了严重的健康风险.
- 准确和灵敏的检测方法对于监测食品中的胺含量至关重要,以防止消费者暴露.
研究的目的:
- 开发一种新,敏感和选择性的方法来量化乳制品中的胺.
- 使用绿色光碳点 (CD) 作为用于检测胺的传感探头.
主要方法:
- 通过微波辐射从酸和尿素中合成绿色光碳点 (CD).
- 研究了胺在CD上的光灭效应,建立了最佳检测条件 (pH 6,CD:样本比 2:8,15分钟反应时间).
- 采用分析表征技术来阐明CDS和胺之间的相互作用机制.
主要成果:
- 开发的方法表现出高灵敏度和选择性来检测胺,光强度与胺度成比例下降.
- 实现了广泛的检测范围 (1.0200.0 ppm),高精度 (<5% RSD),以及低检测极限 (LOD: 0.47 ppm) 和量化极限 (LOQ: 1.56 ppm).
- 确定的胺含量在美国食品和药物管理局为乳制品设定的监管限制内.
结论:
- 开发的基于碳点的光火方法为乳制品中的胺定量提供了可靠和高效的方法.
- 拟议的结相互作用机制为传感原理提供了洞察力.
- 这种方法有助于提高食品安全,通过准确监测胺造.
相关概念视频
03:46Qualitative Analysis
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...
02:23Acid-Base Titration Curves
A titration curve is a plot of some solution property versus the amount of added titrant. For acid-base titrations, solution pH is a useful property to monitor because it varies predictably with the solution composition and, therefore, may be used to monitor the titration’s progress and detect its endpoint. Acid-base titration can be performed with a strong acid and a strong base, a strong acid and a weak base, or a strong base and a weak acid.
For a titration carried out for 25.00 mL of 0.100...
For a titration carried out for 25.00 mL of 0.100...
01:08Titration of a Weak Acid with a Weak Base
Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
As a result, there is no simple...
As a result, there is no simple...
01:18Titration of Polyprotic Base with a Strong Acid
The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
01:19Precipitation Titration: Endpoint Detection Methods
In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...
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01:26Acid–Base Titration: Overview
An acid-base titration is a technique used to determine the concentration of an unknown acid or base, using a titrant of known concentration–either a base for acid titration or an acid for base titration. The process involves gradually adding the titrant, leading to a predictable change in the pH of the solution. This change is plotted on a titration curve, showing how a solution's pH varies with the amount of titrant added. Such curves are instrumental in monitoring the titration's progress...