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

Table 3 Qualitative analysis of free phenolic compounds in mulberry leaves

Compound	Molecular formula	Expected m/z	Observed m/z	Mass error (ppm)	RT (min)	Fragment ions (relative intensity, %)
BeA	C₇H₆O₂	121.0295	121.0294	− 0.83	7.3186	121.02985 (100%), 77.04045 (14.2%), 82.49994 (1.9%)
PrA	C₇H₆O₄	153.0193	153.0194	0.65	7.9276	153.01923 (100%), 153.04488 (3.3%), 109.02855 (2.6%)
GaA	C₇H₆O₅	169.0142	169.0145	1.77	3.4645	169.01408 (100%), 125.02387 (3.3%), 61.7975 (2.5%)
CaA	C₉H₈O₄	179.0350	179.0351	0.56	7.6609	179.03479 (100%), 135.04578 (5.3%)
Sco	C₁₀H₈O₄	191.0350	191.0350	0	9.9880	191.03455 (100%), 176.01178 (9.3%), 147.02908 (3.5%)
Epi	C₁₅H₁₄O₆	289.0718	289.0678	− 13.84	2.2628	243.0616 (100%), 289.06708 (41.6%), 244.06404 (12.5%)
Que	C₁₅H₁₀O₇	301.0354	301.0356	0.66	13.8163	301.03537 (100%), 178.99699 (6.5%), 151.00305 (4.4%), 63.02433 (2.1%)
ChA	C₁₆H₁₈O₉	353.0878	353.0865	− 3.8	6.7420	191.05605 (100%), 192.05885 (8.7%)
Iso	C₂₁H₂₀O₁₂	463.0882	463.0903	4.53	8.6035	463.08832 (100%), 301.03555 (3%)
Rut	C₂₇H₃₀O₁₆	609.1461	609.1478	2.79	8.9101	609.14642 (100%), 609.18945 (9%), 300.02475 (2.2%)
Ast	C₂₁H₂₀O₁₁	447.0933	447.0942	− 2.01	10.6400	447.0932 (100%), 285.0388 (18.98%), 449.0994 (8.2%)

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