ABSTRACT
Flavonoids, lignans, terpenes, phenols, alkaloids, sterols, waxes, fats, tannins, sugars, gums, suberins, resin acids and carotenoids are among the many classes of compounds known as ‘secondary metabolites’. This daunting array of substances, having different chemical, physical and biological properties, presents numerous challenges in the utilization of forest products. Do they also present opportunities?
