Reduction of the environmental impact of the determination of l-carnitine and acetyl-l-carnitine in milk products by microchip electrophoresis

IF 4 2区 农林科学 Q2 CHEMISTRY, APPLIED Journal of Food Composition and Analysis Pub Date : 2024-10-29 DOI:10.1016/j.jfca.2024.106905
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Abstract

A novel miniaturized analytical method for the simultaneous determination of l-carnitine and its ester, acetyl-l-carnitine in fresh milk and milk products by microchip electrophoresis (MCE) with conductivity detection was developed. Under optimized separation conditions, separation voltage of 4 kV and 50 mmol L−1 acetic acid and 0.1 % methylhydroxyethylcellulose at pH 3.0 as background electrolyte, carnitines were sufficiently separated in less than 10 min. An elimination of adsorption of the cationically migrated analytes on a poly(methyl methacrylate) microchip was achieved by addition of 1 mmol L−1 triethylenetetramine to all analyzed samples. The detector response was linear in the range 0.2–1.5 µg mL−1 for l-carnitine and 0.4–2.0 µg mL−1 for acetyl-l-carnitine. The LOQ values were 0.1 µg mL−1 and 0.4 µg mL−1 for l-carnitine and acetyl-l-carnitine, respectively. Recoveries of the analytes in the analyzed samples were in the range 87.5–97.8 %. The developed MCE method has been successfully applied to the analysis of carnitines in eight milk products after a sample pretreatment which included precipitation, centrifugation, and filtration. The developed MCE method has a low hazardous impact on human health and the environment.
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利用微芯片电泳法测定奶制品中的左旋肉碱和乙酰左旋肉碱可减少对环境的影响
本研究建立了一种新型的微型化分析方法,利用微芯片电泳(MCE)和电导检测法同时测定鲜奶和奶制品中的左旋肉碱及其酯类乙酰-左旋肉碱。在优化的分离条件下,分离电压为 4 kV,50 mmol L-1 乙酸和 0.1 % 甲基羟乙基纤维素(pH 值为 3.0)作为背景电解质,肉碱在不到 10 分钟的时间内就得到了充分分离。在所有分析样品中加入 1 mmol L-1 三乙烯四胺,可消除阳离子迁移分析物在聚(甲基丙烯酸甲酯)微芯片上的吸附。检测器在 0.2-1.5 µg mL-1 和 0.4-2.0 µg mL-1 的范围内对左旋肉碱和乙酰左旋肉碱呈线性响应。LOQ值分别为0.1微克/毫升和0.4微克/毫升。分析样品中分析物的回收率在 87.5-97.8 % 之间。所开发的 MCE 方法经过沉淀、离心和过滤等样品前处理后,成功地应用于 8 种奶制品中肉碱的分析。该方法对人体健康和环境的危害较小。
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来源期刊
Journal of Food Composition and Analysis
Journal of Food Composition and Analysis 工程技术-食品科技
CiteScore
6.20
自引率
11.60%
发文量
601
审稿时长
53 days
期刊介绍: The Journal of Food Composition and Analysis publishes manuscripts on scientific aspects of data on the chemical composition of human foods, with particular emphasis on actual data on composition of foods; analytical methods; studies on the manipulation, storage, distribution and use of food composition data; and studies on the statistics, use and distribution of such data and data systems. The Journal''s basis is nutrient composition, with increasing emphasis on bioactive non-nutrient and anti-nutrient components. Papers must provide sufficient description of the food samples, analytical methods, quality control procedures and statistical treatments of the data to permit the end users of the food composition data to evaluate the appropriateness of such data in their projects. The Journal does not publish papers on: microbiological compounds; sensory quality; aromatics/volatiles in food and wine; essential oils; organoleptic characteristics of food; physical properties; or clinical papers and pharmacology-related papers.
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