In a previous study, we developed a graphite sheet-assisted laser desorption ionization-mass spectrometry (GRAMS) method to simultaneously detect both hydrophilic and hydrophobic compounds in a sample without chromatographic separation. In this study, we applied the GRAMS method to a comprehensive analysis of food-related compounds. As a result, a wide range of food-related compounds were detected, including amino acids, fatty acids, sterol lipids, sugars, aroma compounds, vitamins, organic acids, polyphenols, advanced glycation end products, pesticides, and drugs. Using beer as a representative sample, GRAMS successfully detected common flavor compounds and discriminated among four commercial products based on their chemical profiles. Furthermore, combining GRAMS with trapped ion mobility spectrometry time-of-flight mass spectrometry enabled the separation of isomers such as maltotriose and raffinose, thereby substantially improving molecular identification accuracy. The proposed GRAMS platform therefore provides a powerful tool for comprehensive, high-throughput food chemical profiling.
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