Table 1.
Total phenols, flavanols, tannins, and pH of inner and outer bark of six Pinus species (average of two measurements; standard deviation)
| Parameter | P. elliotii | P. caribeae | P. oocarpa | P. merkusii | P. montezumae | P. insularis |
|
| Inner | Outer | Inner | Outer | Inner | Outer | Inner | Outer | Inner | Outer | Inner | Outer |
|
| Total phenolsa | 558.2 (48.6) | 666.2 (258.4) | 577.3 (207.8) | 658.4 (21.6) | 450.1 (62.9) | 829.5 (15.9) | 421.4 (123.4) | 486.5 (132.3) | 546.0 (133.6) | 916.2 (34.3) | 499.1 (6.7) | 758.8 (60.7) |
| Total flavanolsb | 467.3 (9.6) | 42.0 (12.0) | 380.6 (30.9) | 151.0 (146.6) | 863.1 (234.6) | 324.8 (44.8) | 367.4 (144.5) | 55.2 (30.4) | 479.7 (9.1) | 318.8 (260.2) | 469.9 (14.4) | 107.7 (33.1) |
| Tannin-formaldehydec | nd | 1.6 (1.2) | nd | 7.9 (7.3) | nd | 15.1 (1.2) | nd | 0.4 (0.1) | nd | 14.2 (0.5) | nd | 1.6 (0.1) |
| pH | 6.2 (0) | 4.45 (0.1) | 6.5 (0) | 4.25 (0.1) | 6.15 (0.1) | 4.7 (0.1) | 6.15 (0.1) | 4.45 (0.1) | 5.9 (0) | 4.3 (0) | 6.25 (0.2) | 4.5 (0.3) |
Note : a = total phenols are expressed in mg of gallic acid equivalent per g of dry extracts.
b = total flavanols are expressed in mg (+)- catechin equivalent per g of dry extracts.
c = tannin-formaldehyde are in weight percentage of oven-dry bark.
nd = not determined.