Table 2.
Chemical composition of P. radiata bark

Ash (%)	0.42±0.00
Extracts (%)
Cold-water	20.45±0.38
Hot-water	32.81±0.05
1% NaOH	72.85±0.39
Alcohol-benzene	12.69±0.40
Lignin (% on bark) before 1% NaOH extraction
Klason	66.32±0.21
Acid-soluble	14.30±0.20
Total	80.62
Lignin (% on bark) after 1% NaOH extraction
Klason2	12.38±0.07
Acid-soluble	0.11±0.00
Total	12.49
Total polyphenol (%)	53.94

Total polyphenol (%) was calculated by subtracting the Klason lignin after 1% NaOH extraction from the Klason lignin before 1% NaOH extraction.