了解在传统的中国中使用基于脂酶水解的方法形成和减轻罗醇的作用
Yonglin Li1, Yancai Li2, Yan Guo1
1Shaanxi Union Research Center of University and Enterprise for Functional Oil Engineering Technology, College of Food Science and Engineering, Northwest A&F University, 22 Xinong Road, Yangling 712100, Shaanxi, PR China.
Food chemistry
|December 8, 2024
概括
这项研究开发了一种新方法来检测食品中的烯醇. 较高的盐和不和脂肪增加了这些食物污染物,而较长的时间减少了它们.
科学领域:
- 食品化学 食品化学
- 分析化学 分析化学
- 食品安全 食品安全
背景情况:
- 烯醇 Ester 是一种重要的食品污染物.
- 它们在传统的中国方法中形成的机制尚不清楚.
- 了解形成途径对于减轻食品污染至关重要.
研究的目的:
- 开发和验证一种新的分析方法,用于确定四个关键的烯醇.
- 为了研究和热过程中 хлоропропанол的形成.
- 为了确定影响中醇 Ester 形成和降解的因素.
主要方法:
- 用于样品制备的脂酶水解预处理.
- 气色谱-质谱法 (GC-MS) 用于的确定.
- 与快速催化转化方法进行比较分析.
主要成果:
- 与性催化方法相比,脂酶水解方法显示出更高的性能.
- 增加的化 (NaCl) 度与更高的烯醇 Ester 形成相关.
- 较长的时间导致由于降解而导致罗醇 Ester 的减少.
- 富含不和脂肪酸的油导致了更大的烯醇 Ester 生产.
- 在开始或结束时添加NaCl减少了 Ester的形成.
- 在烯醇,过氧化物值和总极性化合物之间观察到强烈的正相关性,表明自由基的作用.
结论:
- 开发的脂酶水解方法对量化罗醇 Ester 有效.
- 条件,特别是NaCl度,油成分和时间,显著影响烯醇 Ester的形成.
- 自由基活动与这些污染物的形成有关.
- 这些发现提供了减轻制食品中烯醇污染的实际策略.
相关概念视频
01:20Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview
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The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
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01:13Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis
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Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
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01:08Esters to β-Ketoesters: Claisen Condensation Mechanism
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01:12Acid Halides to Esters: Alcoholysis
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Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:
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01:24Esters to β-Ketoesters: Claisen Condensation Overview
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Regular Claisen condensation is a base-promoted reaction involving identical esters with two α hydrogens, condensing to produce β-ketoesters. It is a nucleophilic acyl substitution reaction wherein one of the ester molecules, upon deprotonation by the base, forms a nucleophilic enolate ion, while the other molecule serves as an electrophile.
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