Characterization and Potential Antidiabetic Activity of Proanthocyanidins from the Barks of Acacia mangium and Larix gmelinii
Table 2
PAs from ABE and LBE detected by MALDI-TOF/TOF MS.
Polymer
Number of EC/R
Number of EGC
Number of F
Number of GAL
Calculated [M + Na]+
ABE
LBE
Observed [M + Na]+
Δm (ppm)
Observed [M + Na]+
Δm (ppm)
Trimer
3
0
0
0
889.1
ND
889.433
374.4
3
0
0
1
1041.1
1040.889
−202.7
1040.963
−131.6
Tetramer
4
0
0
0
1177.2
1177.485
242.0
1177.505
259.0
3
1
0
0
1193.2
1193.486
239.6
1191.507
−1420.9
2
2
0
0
1209.2
1209.484
234.8
1207.517
−1393.8
Pentamer
5
0
0
0
1465.3
1465.596
202.0
1465.621
219.0
4
1
0
0
1481.2
1481.597
268.0
1481.626
287.5
3
2
0
0
1497.2
1497.588
259.1
ND
—
Hexamer
6
0
0
0
1753.3
1753.717
237.8
1753.725
242.3
5
1
0
0
1769.3
1769.701
226.6
ND
—
4
2
0
0
1785.3
1785.697
222.3
ND
—
3
3
0
0
1801.3
1800.731
−316.0
ND
—
Heptamer
6
0
1
0
2025.3
2025.778
236.0
2022.906
−1183.4
7
0
0
0
2041.3
2042.808
738.2
2040.852
−219.5
6
1
0
0
2057.3
2058.781
719.4
2056.804
−241.2
5
2
0
0
2073.3
2073.816
248.8
ND
—
EC, R, F, EGC, and GAL are abbreviations of (epi)catechin, robinetinidol, fisetinidol, (epi)gallocatechin, and galloyl moieties. ND means no peaks corresponding to the calculated peaks were observed.
