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相关概念视频

Ions as Acids and Bases02:54

Ions as Acids and Bases

26.8K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
26.8K
Lewis Acids and Bases02:33

Lewis Acids and Bases

48.5K
In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
48.5K
Acids, Bases and Neutralization Reactions03:26

Acids, Bases and Neutralization Reactions

64.0K
An acid-base reaction is one in which a hydrogen ion, H+, is transferred from one chemical species to another. Such reactions are of central importance to numerous natural and technological processes, ranging from the chemical transformations within cells or lakes and oceans to the industrial-scale production of fertilizers, pharmaceuticals, and other substances essential to the society.
64.0K
Bronsted-Lowry Acids and Bases02:58

Bronsted-Lowry Acids and Bases

106.2K
The acid-base reaction class has been studied for quite some time. In 1680, Robert Boyle reported traits of acid solutions that included their ability to dissolve many substances, to change the colors of certain natural dyes, and to lose these traits after coming in contact with alkali (base) solutions. In the eighteenth century, it was recognized that acids have a sour taste, react with limestone to liberate a gaseous substance (now known to be CO2), and interact with alkalis to form neutral...
106.2K
Acid-Base Titration Curves02:23

Acid-Base Titration Curves

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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...
141.9K
Strong Acid and Base Solutions03:22

Strong Acid and Base Solutions

36.2K
A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions.
36.2K

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Development of an Electrochemical DNA Biosensor to Detect a Foodborne Pathogen
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基于3 - 默卡普托酸剂的生物传感器系统,使用金印刷电极检测阿弗拉托克素B1.

Burçak Demi̇rbakan1, Ahmet Çeti̇nkaya2, Evrim Güneş Altuntaş3

  • 1Çanakkale Onsekiz Mart University, Faculty of Engineering, Bioengineering Department, Çanakkale, Türkiye.

Journal of pharmaceutical and biomedical analysis
|February 13, 2026
PubMed
概括

一个新的电化学生物传感器可以在食品中超敏感检测亚毒素B1 (AFB1). 这种可靠的方法提高了食品安全监测的高度准确性和选择性.

关键词:
3 - 墨卡托普罗皮昂酸 (3-MPA) 的使用.非洲毒素B1 (AFB-1) 是一种黄金印电极 (SPE-Au) 的使用

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科学领域:

  • 电化学 电化学 电化学
  • 生物传感器技术技术
  • 食品安全分析 食品安全分析

背景情况:

  • 非洲毒素B1 (AFB1) 对食品安全和人类健康构成重大威胁.
  • 在各种食品矩阵中,准确和灵敏的AFB1检测方法至关重要.
  • 现有的检测方法可能缺乏常规监测所需的灵敏度,速度或成本效益.

研究的目的:

  • 开发和验证一种新的电化学生物传感器,用于超敏感检测AFB1.1.
  • 优化生物传感器平台,以提高分析性能和可靠性.
  • 评估生物传感器在现实世界食品安全监测中的适用性.

主要方法:

  • 使用金印电子 (SPE-Au) 上的3 - 默卡普托酸 (3-MPA) 修改自组装单层 (SAM) 构建生物传感器.
  • 反AFB1抗体对功能化电极表面的共价固定.
  • 使用循环电量计 (CV) 和电化学阻抗光谱 (EIS) 的电化学表征.
  • 优化3-MPA度以提高分析性能.

主要成果:

  • 开发的生物传感器实现了AFB1的广泛线性检测范围,从0.1到250 pg/mL.
  • 超敏感检测被证明具有0.94ppg/ml的检测极限 (LOD) 和3.14ppg/ml的量化极限 (LOQ).
  • 生物传感器具有很高的可重复性,对AFB1具有很好的选择性,并在分析真实食品样本 (牛奶,大米,花生,) 中成功应用.

结论:

  • 这种新型电化学生物传感器为各种食品中AFB1检测提供了一个高度敏感和可靠的平台.
  • 优化的生物传感器设计和性能表明其在食品安全监督中的实际应用潜力强大.
  • 这项技术可以通过确保食品供应链的安全,为保护公共健康做出贡献.