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Table 2 The data of compounds in lotus leaves obtained using HREIMS (A1: the peak area of the positive group; A2: the peak area of the blank control)

From: Fabrication of paper-based enzyme immobilized microarray by 3D-printing technique for screening α-glucosidase inhibitors in mulberry leaves and lotus leaves

Peak no. tR/min Identification Molecular formula [M − H] A1/A2 (%)
Detected Expected Error/ppm
1 23.236 Quercetin-3-O-glucuronide C21H18O13 477.0663 477.0670 − 1.5 132
2 24.017 Isoquercitrin C21H20O12 463.0876 463.0877 − 0.2 109
3 39.950 Quercetin C15H10O7 301.0348 301.0349 − 0.3 105
4 39.372 Kaempferol C15H10O6 285.0404 285.0399 1.8 97