Stemwood extractives-based products The stemwood extractives and products based on them can be classified to the following groups: Terpenes and terpenoids-based products Pine tar Turpentine Rosin Sterols Polyphenols-based products: products from knot lignans Fatty acids-based products These extractives are separated from wood biomass either via extraction or as by-products from kraft pulping (Figure 1). In
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