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区域,加工和它们对Pu-Erh茶的元素特征的影响

Yan-Long Li1,2, He-Yuan Jiang1, Ming-Ming Chen2

  • 1Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu 610213, China.

Foods (Basel, Switzerland)
|August 28, 2025
PubMed
概括

普埃尔茶的元素分析有效地追溯了它的地理来源, 区域因素比加工方法更有影响. 这一发现支持消费者保护和茶叶行业的可持续发展.

关键词:
在 ICP-MS化学测量基本指纹食品的可追溯性

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In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
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