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Table 4 Qualitative analysis of bound phenolic compounds in mulberry leaves

From: Comparison of free and bound phenolic compositions and antioxidant activities of leaves from different mulberry varieties

Compound Molecular formula Expected m/z Observed m/z Mass error (ppm) RT (min) Fragment ions (relative intensity, %)
SyA C9H10O5 197.0455 197.0457 1.01 3.3027 135.04504 (100%), 153.05786 (31.6%), 162.83853 (26.5%), 61.98833 (25.3%)
GaA C7H6O5 169.0142 169.0144 1.18 3.4643 169.01404 (100%), 168.88683 (15.4%), 125.02482 (8.8%), 122.89381 (2.7%)
BeA C7H6O2 121.0295 121.0305 8.26 7.3001 121.02959 (100%), 77.04009 (10.4%), 77.05341 (0.8%)
PrA C7H6O4 153.0193 153.0193 0 7.7071 153.01918 (100%), 109.02876 (6.1%)
CaA C9H8O4 179.0350 179.0352 1.12 7.7366 179.03502 (100%), 135.04532 (12.9%)
Iso C21H20O12 463.0882 463.0877  − 1.08 8.5514 463.08813 (100%), 301.03839 (3.6%), 193.01373 (1.9%)
Rut C27H30O16 609.1461 609.1469 1.31 9.2957 609.14612 (100%), 300.02649 (3.7%)
FeA C10H10O4 193.0506 193.0508 1.04 10.0027 193.05028 (100%), 134.03656 (4.7%)
Ast C21H20O11 447.0933 447.0937 0.89 10.9455 447.0921 (100%), 285.03876 (3.7%)
Que C15H10O7 301.0354 301.0353  − 0.33 13.7901 301.03534 (100%), 300.99191 (5.2%)
  1. All spectra were recorded in negative ion mode with a collision energy of 10 V