龙茶中的造诱导的转化:对烤香味的感觉,化学和分子洞察力
Yiqin Chen1, Xinyu Liu1, Wan Zhu1
1Tea Research Institute, Zhejiang University, Hangzhou 310058, PR China.
Food research international (Ottawa, Ont.)
|February 28, 2026
概括
烤龙茶发展出其特有的香气,由丰富的pyrazines驱动. 这些化合物与嗅觉受体结合,解释感官体验并指导茶叶加工优化.
科学领域:
- 食品化学 食品化学
- 感官科学 感官科学
- 分子美食学分子美食学
背景情况:
- 烤显著影响长茶的感觉特征.
- 其烤香气背后的分子机制尚未完全理解.
研究的目的:
- 调查时间和温度如何影响龙茶的感觉品质,生物化学成分和挥发性化合物.
- 通过感官分析,化学分析和分子对接,阐明烤香气的分子基础.
主要方法:
- 系统地改变烤制参数 (持续时间:10-30分钟,温度:210-230°C).
- 茶叶属性的感官评估.
- 生物化学分析自由氨基酸,可溶性糖和 катехин.
- 挥发性有机化合物 (VOC) 分析使用头部空间固相微提取气色谱质谱法 (HS-SPME-GC-MS/MS).
- 相对气味活动值 (ROAV) 分析.
- 用嗅觉受体 (OR1A1,OR1D2) 进行分子对接模拟.
主要成果:
- 强化烤导致了"烤"和"烧"音符的增加,缩性和苦味.
- 与乌玛米相关的氨基酸和糖的显著降解,以及甲基素氧化和表皮化.
- 鉴定了1286种挥发性有机化合物,其中显著的丰富的pyrazines与烤的气味相关.
- 确定了27种关键的芳香活性化合物,主要是pyrazines.
- 分子对接证实了pyrazines通过疏水,结合和π-π堆叠相互作用稳定地与嗅觉受体结合.
结论:
- 烤显著改变了龙茶的化学成分和感官感知.
- 烟草素是龙茶特有的烤香气的关键贡献者.
- 该研究提供了对烤茶香味感知的分子理解,并为优化茶叶烤过程提供了指导.
更多相关视频
08:43PTR-ToF-MS Coupled with an Automated Sampling System and Tailored Data Analysis for Food Studies: Bioprocess Monitoring, Screening and Nose-space Analysis
Published on: May 11, 2017
13.1K
06:04Source and Route of Pyrrolizidine Alkaloid Contamination in Tea Samples
Published on: September 28, 2022
2.5K
相关概念视频
01:14NMR Spectroscopy of Aromatic Compounds
6.5K
Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.
6.5K
01:43Gustation
52.9K
Gustation is a chemical sense that, along with olfaction (smell), contributes to our perception of taste. It starts with the activation of receptors by chemical compounds (tastants) dissolved in the saliva. The saliva and filiform papillae on the tongue distribute the tastants and increase their exposure to the taste receptors.
52.9K
01:14π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
2.0K
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...
2.0K
01:12Stereochemical Effects of Enolization
2.7K
The chiral α-carbon of the carbonyl compound is the stereocenter of the molecule. As shown in the figure below, when such a carbonyl compound undergoes racemization under an acidic or basic condition, an achiral enol is formed.
2.7K
01:25Aromatic Compounds: Overview
15.1K
In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday isolated...
In 1825, Faraday isolated...
15.1K
01:20Taste Buds and Receptors
5.5K
Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...
5.5K