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

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)

Peak no.	t_R/min	Identification	Molecular formula	[M − H]⁻			A₁/A₂ (%)
Peak no.	t_R/min	Identification	Molecular formula	Detected	Expected	Error/ppm	A₁/A₂ (%)
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

ISSN: 1749-8546