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NMR Spectroscopy of Benzene Derivatives01:34

NMR Spectroscopy of Benzene Derivatives

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Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling...
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Extraction and Analysis of Taiwanese Green Propolis
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Extraction and Analysis of Taiwanese Green Propolis

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巴西和中国的组成差异

Sierra R Parkinson1, Francelia J Eckembrecher2, Lazaro Antonio Toledo Machin3

  • 1From the University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA.

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此摘要是机器生成的。

最近气过敏反应的增加与巴西气和中国气之间的组成差异有关. 化学构成的这些变化可能解释了阳性贴片测试的增加.

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Methods for Comparing Nutrients in Beebread Made by Africanized and European Honey Bees and the Effects on Hemolymph Protein Titers
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科学领域:

  • 分析化学 分析化学
  • 自然产品 化学 化学
  • 皮肤病学 皮肤病学

背景情况:

  • 增加了对的阳性补丁测试反应的患病率.
  • 反应速率的变化取决于 прополис制造商.

研究的目的:

  • 为了比较巴西和中国的化学成分.
  • 调查增加粉过敏患病率的潜在原因.

主要方法:

  • 电子喷雾电离质谱仪 (ESI-MS) 用于样本分析.
  • 使用 mzCloud,ChemSpider 和 MassList 数据库识别化合物.
  • 使用Compound Discoverer软件进行数据处理,以识别顶级化合物.

主要成果:

  • 巴西和中国的组成重叠非常低 (8-27%的相似性).
  • 在每个类型中确定了不同的主要化合物集.
  • 在两种样本中,Prenylgermacrene B是前六名中唯一常见的化合物.

结论:

  • 巴西和中国之间存在显著的化学差异.
  • 制造商停止使用中国 (NA71) 并用巴西 (NH400) 代替,这可能解释了过敏反应的增加.
  • 化学变异性是与 прополис相关的接触性皮肤炎的一个关键因素.