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Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are...
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使用生物衍生染料的纸质色度pH测试带.

Aramis A Sánchez1, Darwin Castillo2,3, Grettel Riofrío-Cabrera2

  • 1PROSUR Construcción Sustentable del Sur, Puebla 72810, Mexico.

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概括
此摘要是机器生成的。

来自卷心菜,,卜和黄的天然染料显示出作为环保pH指标的承诺. 这些可持续的替代品为pH测量提供了具有成本效益和易于区分的颜色变化.

关键词:
卷心菜 卷心菜 卷心菜染料 染料是一种染料.我们的环境环境环境环境环境环境环境环境天然染料是一种天然的染料.它们的pH值为pH.颜料 颜料是一种颜料.卜 卜 卜 卜 卜 卜 卜 卜 卜传感器 传感器 传感器试验带试验带的测试黄是一种黄.

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科学领域:

  • 绿色化学 绿色化学
  • 分析化学 分析化学
  • 自然产品化学 自然产品化学

背景情况:

  • 合成染料在工业应用中引发了环境问题.
  • 传统的pH测量工具可能昂贵而复杂.
  • 天然染料为各种工业需求提供了可持续且具有成本效益的替代品.

研究的目的:

  • 为了探索自然有机染料的pH反应性质.
  • 开发一种使用天然染料颜料的新型pH指标.
  • 评估天然染料作为传统pH测量技术的替代品的潜力.

主要方法:

  • 从40种蔬菜物种中提取和分析颜料.
  • 使用70%甲醇/30%水的溶剂混合物进行色素提取.
  • 评估了各种pH值的染料提取物的色度反应.

主要成果:

  • 来自卷心菜,花,卜和黄的颜料在广泛的pH范围内表现出显著的颜色变化.
  • 颜色变化很容易区分,与特定的pH值水平相关.
  • 干色素状态表现为pH指示的最佳反应性和稳定性.

结论:

  • 天然染料,特别是从卷心菜,,卜和黄中得到的染料,是有效的pH指标.
  • 这些发现支持使用天然染料作为传统pH测量方法的可持续和经济替代品.
  • 这项研究突出了天然染料在工业pH值验证中的新应用.