相关实验视频
Updated: Jun 17, 2025

11:15
HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
Published on: July 23, 2016
10.2K
来自不同来源的香草豆的分子芳香成分
Thi Khanh Linh Tran1, Ivana Salvatore1, Joel Geller1
1Life Sciences and Facility Management, Zurich University of Applied Sciences (ZHAW), 8820 Wädenswil, Switzerland.
Journal of agricultural and food chemistry
|August 14, 2024
概括
天然香草的需求正在上升,需要新的高质量来源. 这项研究揭示了三种香草品种中的关键芳香化合物,其中突出的是香草.
科学领域:
- 食品化学 食品化学
- 分析化学 分析化学
- 自然产品分析 自然产品分析
背景情况:
- 全球对天然香草的需求不断增加,需要探索各种来源并了解影响其质量的因素.
- 香草的香味特征对其市场价值至关重要,但品种和来源的影响尚未完全阐明.
- 识别关键的芳香化合物及其对气味的贡献对于质量控制和开发新的香草产品至关重要.
研究的目的:
- 进行第一个对三种主要香草品种香味成分的比较分析: *Vanilla planifolia*, *Vanilla pompona* 和 *Vanilla tahitensis*.
- 识别和量化关键的芳香活性化合物,并确定它们对不同来源的整体香味特征的贡献.
- 调查地理位置对 *Vanilla planifolia* 中挥发性成分的影响.
主要方法:
- 使用气体色谱-光度计 (GC-O) 和芳香提取物稀释分析 (AEDA) 选了气味活性分子.
- 选择的化合物通过稳定同位素稀释试验 (SIDA) 量化,并计算出它们的剂量超过值 (DoT) 值.
- 进行了对不同香草品种和地理来源的香味特征进行比较分析.
主要成果:
- 瓦尼林被证实是V. planifolia*中最重要的气味剂,具有最高的DOT值.
- 鉴定出4-甲基醇和4-甲基甲为*V. pompona*和*V. tahitensis*的歧视性气味剂.
- 地理来源显著影响了气味的特征,在乌干达的V. planifolia*中观察到3基-4,5-二甲基-2(5H) - furanone DoT值的升高. 在各种香草样本中发现了新型化合物2 - 甲基 - 3 - 甲基.
结论:
- 该研究阐明了主要香草品种的独特香味特征,并突出了地理来源对挥发性成分的影响.
- 瓦尼林是 *V. planifolia* 中的关键芳香化合物,而其他化合物,如4 - 甲基醇和4 - 甲基甲,则区分其他品种.
- 这项研究为香草的香味化学提供了宝贵的见解,对于质量评估和采购策略至关重要.
相关概念视频
Aromatic Compounds: Overview
10.5K
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...
In 1825, Faraday...
10.5K
NMR Spectroscopy of Aromatic Compounds
4.6K
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.
4.6K
Structures of Aldehydes and Ketones
8.6K
Vanillin—a flavoring agent in vanilla, cinnamaldehyde—a molecule responsible for the distinct smell of cinnamon, and acetone—a strong-smelling ingredient in nail polish removers, all belong to a class of carbonyl compounds called aldehydes and ketones (Figure 1). Although both aldehydes and ketones contain the characteristic carbonyl (C=O) bond, their chemical structures vary with respect to the groups directly attached to the carbonyl carbon.
In aldehydes (Figures 1a and 1b),...
In aldehydes (Figures 1a and 1b),...
8.6K
Volatilization
374
Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
374
Distillation: Vapor–Liquid Equilibria
2.7K
Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube...
2.7K
Mass Spectrum: Interpretation
1.1K
An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a low-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.
To...
To...
1.1K

