通过集成的摇,冷和滚动加工来提高夏季茶的质量.
Changlian Wu1, Huang Li2, Qingxiu Lin3
1Anxi College of Tea Science, Fujian Agriculture and Forestry University, Quanzhou 362400, China.
Foods (Basel, Switzerland)
|September 27, 2025
概括
这项研究通过整合,冷和滚动来优化夏季白茶的加工. 这种新方法提高了茶叶的质量,改善了口味配置,并增加了诸如L-theanine等有益化合物.
科学领域:
- 农业科学 农业科学
- 食品科学 食品科学 食品科学
- 生物化学 生物化学
背景情况:
- 夏季茶的低利用率限制了茶业的增长.
- 提高夏季茶的质量对于市场扩张和消费者满意度至关重要.
研究的目的:
- 创新传统的白茶加工,包括,冷和滚动夏季茶.
- 优化加工参数,以提高夏季茶叶的质量.
- 系统地评估优化加工对夏季茶的化学成分和感官属性的影响.
主要方法:
- 采用单因素实验和一个L9(34) 直角实验设计来进行参数优化.
- 利用感官分析,气色谱-质谱 (GC-MS) 和高性能液色谱 (HPLC) 来进行质量评估.
- 确定了最佳加工条件:冷空气干6.5小时,10分钟摇动 (10rpm),5小时冷 (-20°C),9分钟滚动 (25%强度),2小时干燥 (75°C).
主要成果:
- 与对照组相比,优化加工减少了14.62%的化儿茶素.
- 氨基酸概况的显著变化:增加了新鲜 (4.96%) 和甜 (2.95%) 的氨基酸,减少了苦氨基酸 (2.15%).
- 增加了γ-氨基黄油酸 (0.51%) 和L-神氨酸 (5.77%).
- 确定了五种特征性的挥发性化合物 (甲基酸盐,甲基甲酸,林纳醇,二甲基硫化物,异甲基),有助于产生花,水果和玉米般的香味.
结论:
- 综合加工方法显著提高了夏季白茶的质量.
- 代谢物水平分析为增强夏季茶的感觉和化学特性提供了科学基础.
- 这项研究为茶业提供了宝贵的见解,以增加夏季茶的利用率和市场价值.
相关概念视频
01:10Recrystallization: Solid–Solution Equilibria
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
01:22Mass Concreting
Mass concreting refers to the process of placing large volumes of concrete, such as in gravity dams. The heat generated during the cement hydration process and differential cooling rates within the concrete mass can lead to a temperature gradient, which can result in thermal cracks in the concrete mass.
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
01:20Hot Weather Concreting
Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
01:14Design Example: Managing Concrete Workability
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
To address...
To address...
01:25Microbes in Beverage Production
Alcoholic beverages such as wine, beer, and spirits are the products of microbial fermentation processes that transform simple sugars into ethanol and a wide array of complex flavor compounds. These transformations rely on the metabolic activities of specific yeasts and bacteria, which are selected and controlled to yield the desired beverage characteristics.Wine Fermentation and MaturationWine production begins with the crushing of grapes to release juice and pulp, forming a must that is...
01:29Downstream Processing
Downstream processing begins once fermentation is complete and involves a series of steps to recover and purify products such as acids, vitamins, antibiotics, or proteins.Cell HarvestingFor example, for intracellular protein-based products, the first step is harvesting the cells. This is typically achieved using centrifugation or filtration to separate the cells from the liquid phase.Cell Disruption for Intracellular ProductsIf the target product is intracellular, the harvested cells must be...