WOOD CHEMISTRY Flashcards
1
Q
- a broad, interdisciplinary field focusing on the chemical and biochemical aspects of trees and products such as pulp and paper that are derived from trees.
A
WOOD CHEMISTRY
2
Q
As an organic material, wood’s principal element is _______
A
CARBON
3
Q
Taken together, cellulose and hemicellulose are referred to as __________
A
HOLOCELLULOSE
4
Q
CHEMICAL COMPONENTS OF THE CELL WALL:
A
I. Primary Components
II. Secondary Components
5
Q
Primary Components:
A
a. Holocellulose
b. Cellulose
c. Hemicellulose
d. Lignin
6
Q
- the polysaccharide fraction of the woody
element comprising about 60 – 70%
A
Holocellulose
7
Q
- (40 – 50%) long chain of glucose units that polymerize into microfibrils
- man can digest starch (a polysaccharide) but not cellulose which animals can digest because of
cellulose enzymes present in their guts or stomach
A
Cellulose
8
Q
_______ is the purest form of cellulose known in nature.
A
COTTON
9
Q
- (20 – 35%) matrix substance of the cell
wall composed of two types of sugar
molecules: xylans and glucomannans
A
Hemicellulose
10
Q
- (15 – 35%) made of intractable material which
acts as the cementing substance of wood
A
Lignin
11
Q
Secondary Components:
A
- Tannins
- Volatile oils – distilled oils
- Resins
- Gums, latex, dyes and other organic substance
- Ash
12
Q
– approximately 0.5 – 1% of the wood substance (inorganic extraneous materials)
A
Ash
