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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