相关实验视频
Updated: Aug 6, 2026

00:05
Preparation of High-Quality Fermented Fish Product
Published on: August 23, 2019
10.3K
意大利沙夫兰的质量评估进展
Irene Locatelli1, Davide Pedrali2, Silvia Grassi3
1Department of Food, Environmental, and Nutritional Sciences (DeFENS), Università degli Studi di Milano, Via G. Celoria 2, 20133, Milan, Italy.
Scientific reports
|January 17, 2025
概括
这项研究提出了高质量沙夫兰的新子类别,增强了ISO 3632标准. FT-NIR光谱学有效地区分了沙夫兰的质量,支持了行业的精炼.
科学领域:
- 农业科学 农业科学
- 食品化学 食品化学
- 分析化学 分析化学
背景情况:
- 番石榴 (Crocus sativus L.) 是一种全球有价值的香料,意大利是欧洲的主要生产国.
- 目前的ISO 3632标准分类沙夫兰的质量,但需要在顶级类别内进行更细微的区分.
- 高品质的藏红花需要精确的评估,以保持其市场价值和消费者信任.
研究的目的:
- 通过引入子类别,提出对高质量的沙夫兰进行改进的分类系统.
- 为了评估FT-NIR光谱学与化学计量相结合的有效性,以评估香的质量.
- 为了支持提升ISO 3632标准的沙夫兰质量.
主要方法:
- 使用传统方法和FT-NIR光谱学分析来自意大利 (收获2021-2022) 的125个藏红花样本.
- 化学测量方法的应用,包括线性差异分析 (LDA) 和模式相似性分析 (SIMCA),用于质量评估.
- 开发差异化和类模型方法来预测沙夫兰品质子类别.
主要成果:
- 分析的沙夫兰样品中有95%符合ISO第一个质量标准.
- 建议为优质的沙夫兰提供分类:"优质"",优质"和"高质量".
- 线性差异分析模型实现了高精度 (校准:92.7%,交叉验证:86.4%,预测:87.0%).
- 对于类型建模,SIMCA建模被证明是有效的,它防止了"高级"和"高质量"样本之间的错误分类.
结论:
- 该研究支持将子类别纳入ISO 3632标准,以完善沙夫兰的质量分类.
- FT-NIR光谱是一种强大而有效的工具,用于客观地评估沙夫兰的质量.
- 这些发现对改善沙夫兰生产和贸易的行业标准和做法有潜在的影响.
相关概念视频
Fineness of Cement
The fineness of cement directly influences the rate of hydration, as the hydration begins at the surface of the cement particles. In addition to hydration, the fineness of cement is vital for various properties of concrete including workability, gypsum requirement, and long-term behavior. The fineness of cement is represented in terms of the specific surface of cement which is typically measured in square meters per kilogram, with several methods available for this determination.
Direct...
Direct...
Soundness of Cement
The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create ettringite,...
Testing Water Quality
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...

