Table 1.

Main component groups in acetone/water extracts of different larch wood materials by GC-MS.

Component Groups	Larch Wood Mixture (mg/g)	Sound Knotwood (mg/g)	Dead Knotwood (mg/g)
Carboxylic acids	0.026	0.139	0.011
Phenolic acids	0.116	1.666	0.081
Sugar	0.206	0.472	0.045
Fatty acids	0.140	0.483	0.047
Resin acids	0.079	0.186	0.014
Polyphenols	2.726	23.766	1.305
Sterols	0.016	0.235	0.011