Table 7 LC–MS identification of the main ions detected during oxidation of sinapic acid by PcLac1 and PcLac2

Dimers

17

6.19

445

C₂₂H₂₁O₁₀

189 (C₁₁H₉O₃), 174 (C₁₀H₆O₃), 161 (C₉H₅O₃), 145 (C₉H₅O₂), 121 (C₇H₅O₂)

Disinapic acid

Minor

Major

18

6.69

445

C₂₂H₂₁O₁₀

189 (C₁₁H₉O₃), 174 (C₁₀H₆O₃), 161 (C₉H₅O₃), 145 (C₉H₅O₂), 121 (C₇H₅O₂)

Disinapic acid

Major

Minor

19

6.97

401.1220

C₂₁H₂₁O₈

189 (C₁₁H₉O₃), 174 (C₁₀H₆O₃), 161 (C₉H₅O₃), 145 (C₉H₅O₂),

133 (C₈H₅O₂), 121 (C₇H₅O₂)

Decarboxylated disinapic acid

Not detected

Detected

20

7.21

401.1220

C₂₁H₂₁O₈

189 (C₁₁H₉O₃), 174 (C₁₀H₆O₃), 161 (C₉H₅O₃), 145 (C₉H₅O₂), 133 (C₈H₅O₂), 121 (C₇H₅O₂)

Decarboxylated disinapic acid

Not detected

Detected

21

6.26

357.060

C₁₈H₁₃O₈

271 (C₁₄H₇O₆), 227 (C₁₃H₇O₄), 199 (C₁₂H₇O₂), 167 (C₁₂H₇O)

Bis-Decarboxylated disinapic acid

Detected

Detected

Trimers

22

7.38

667.1643

C₃₃H₃₁O₁₅

-

Trisinapic acid

Not detected

Minor

23

7.09

623.1746

C₃₂H₃₁O₁₃

265 (C₁₆H₉O₄), 209 (C₁₄H₉O₂), 121 (C₇H₅O₂)

Trisinapic acid, decarboxylated

Not detected

Detected

24

7.55

623.1746

C₃₂H₃₁O₁₃

265 (C₁₆H₉O₄), 209 (C₁₄H₉O₂), 121 (C₇H₅O₂)

Trisinapic acid, decarboxylated

Not detected

Detected

25

8.16

579.1846

C₃₁H₃₁O₁₁

339 (C₁₉H₁₅O₆)

Trisinapic acid, bis-decarboxylated

Not detected

Detected

Tetramers

26

6.98

891.2319

C₄₄H₄₃O₂₀

341 (C₁₉H₁₇O₆), 189 (C₁₁H₉O₃), 174 (C₁₀H₆O₃), 161 (C₉H₅O₃), 145 (C₉H₅O₂), 121 (C₇H₅O₂)

Tetrasinapic acid

Not detected

Detected

Others

27

7.99

503.1172

C₂₄H₂₃O₁₂

147 (C₈H₃O₃) 119 (C₇H₃O₂)

Unknown compound

Detected

Not detected