技术
HPLC: suitable
试验参数
column: Ascentis Express HILIC, 10 cm x 2.1 mm I.D., 2.7 μm particles (53939-U)
mobile phase: 2 mM ammonium formate in 5:95, water:acetonitrile, to pH 4.4 with formic acid
flow rate: 0.6 mL/min
column temp.: 50 °C
detector: ESI(+), 50-800 m/z
injection: 1 μL
sample: 200 mg/L in methanol
适用性
application for HPLC
应用
food and beverages
一般描述
This method features fast analysis of methylimidazole derivatives used in caramel-colored carbonated beverages.
分析说明
The purpose of this study was to develop a fast analytical method for analyzing for 2-methylimidazole and 4-methylimidazole in caramel colored carbonated beverages. The FDA has recently increased the awareness of the potential hazards of methylimidazole. These compounds can be found in caramel additives used in a broad range of food stuff. In this study the focus is the levels of methylimidazole in various colas. Methylimidazoles are a difficult group of compounds to analyze due their polar nature and low molecular weight. Traditional reversed phase separation are unsuccessful in retaining these small polar compounds, with most methods utilizing ion-exchange resins for analysis. Other common methods are GC analysis with sample derivitization.
法律信息
Ascentis is a registered trademark of Merck KGaA, Darmstadt, Germany
分析物
说明
4(5)-Methylimidazole, purum, ≥98.0% (GC)
2-Methylimidazole, ≥95.0% (HPLC), pharmaceutical impurity standard
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