Heartwood extractives of cryptomeria japonica and elaeocarpus dentatus

Abstract

Wood, as a product of biological development, is a complex substance both anatomically and chemically. It is not uniform even within a single tree, and varies somewhat between individual plants, and often greatly between species. Wood is a typical lignified plant tissue, and its cell walls are composed primarily of cellulose, other polysaccharides, and lignin. Within the cell cavities, and adhering to the walls, are other complex natural substances, such as tannins, starch, resins, oils, dyes, etc.