Table 2.

Chemical composition (mean and standard deviation) of the cork samples according to the year of debarking (and number of droughts), in % of total dry mass.

Chemical parameter	1994 (no drought)	2003 (two droughts)	2012 (one drought)
Extractives total	12.05 ± 1.79	12.09 ± 1.22	12.52 ± 1.70
Dichloromethane	5.18 ± 1.04	5.33 ± 0.66	4.93 ± 0.82
Ethanol	3.00 ± 1.06	3.03 ± 0.99	4.12 ± 1.23
Water	3.87 ± 0.67	3.73 ± 0.69	3.47 ± 0.72
Suberin	36.56 ± 3.32	38.24 ± 3.67	35.97 ± 4.50
Lignin, total	27.93 ± 2.38	26.04 ± 2.71	27.74 ± 3.30
Klason	26.63 ± 2.36	24.72 ± 2.75	26.54 ± 3.18
Acid soluble	1.30 ± 0.26	1.32 ± 0.19	1.19 ± 0.24
Ratio suberin/total lignin	1.33 ± 0.22	1.49 ± 0.27	1.33 ± 0.33
Polysaccharide composition (% of total monosaccharides)
Rhamnose	1.48 ± 0.50	0.82 ± 0.19	1.35 ± 0.47
Arabinose	19.22 ± 4.25	14.19 ± 2.41	17.82 ± 2.57
Galactose	8.92 ± 2.03	6.31 ± 0.79	8.04 ± 0.77
Glucose	40.73 ± 2.81	40.22 ± 0.96	39.24 ± 1.57
Xylose	20.11 ± 6.16	29.64 ± 3.79	23.78 ± 1.91
Mannose	1.95 ± 3.11	1.12 ± 1.20	1.59 ± 1.97
Galacturonic acid	5.73 ± 1.51	4.45 ± 0.36	5.89 ± 0.93
Glucuronic acid	1.18 ± 1.60	2.47 ± 0.16	1.11 ± 1.44
Acetyl	0.68 ± 0.22	0.78 ± 0.38	1.19 ± 0.76

Monosaccharide composition is expressed in % of total monosaccharides.