High-performance cation exchange chromatography coupled to tandem mass spectrometry or electrochemical detection was found to be an efficient tool for analyzing Amadori compounds derived from hexose and pentose sugars. The method allows rapid separation and identification of Amadori compounds, while benefiting from the well-known advantages of mass spectrometry, such as specificity and sensitivity. Glucose- and xylose-derived Amadori compounds of several amino acids, such as glycine, alanine, valine, leucine/isoleucine, methionine, proline, phenylalanine, and glutamic acid, were separated or discriminated using this new method. The method is suitable for the analysis of both model reaction mixtures and food products. Fructosylglutamate was found to be the major Amadori compound in dried tomatoes (∼1.5 g/100 g) and fructosylproline in dried apricots (∼0.2 g/100 g). Reaction of xylose and glycine at 90 °C (pH 6) for 2 h showed rapid formation of xylulosylglycine (∼12 mol %, 15 min) followed by slow decrease over time. Analysis of pentose-derived Amadori compounds is shown for the first time, which represents a major breakthrough in studying occurrence, formation, and decomposition of these labile Maillard intermediates.
研究发现,高效阳离子交换色谱法与串联质谱法或电
化学检测相结合,是分析源自己糖和戊糖的阿马多尔里化合物的有效工具。该方法可快速分离和鉴定阿莫多利化合物,同时受益于众所周知的质谱优势,如特异性和灵敏度。利用这种新方法分离或鉴别了多种
氨基酸(如甘
氨酸、丙
氨酸、缬
氨酸、亮
氨酸/
异亮氨酸、蛋
氨酸、脯
氨酸、苯丙
氨酸和谷
氨酸)的
葡萄糖和
木糖衍生阿马多尔里化合物。该方法适用于模型反应混合物和食品的分析。结果发现,
果糖基谷
氨酸是番茄干中的主要 Amadori 化合物(1.5 克/100 克),
果糖基脯
氨酸是杏干中的主要 Amadori 化合物(0.2 克/100 克)。
木糖和甘
氨酸在 90 °C(pH 值 6)下反应 2 小时后,
木糖基甘
氨酸迅速生成(∼12 摩尔%,15 分钟),随后随着时间的推移缓慢减少。这是对戊糖衍生的 Amadori 化合物的首次分析,标志着在研究这些易变的 Maillard 中间体的发生、形成和分解方面取得了重大突破。