Table 1.
Chromatic photometric absorption bands of mangium tannin extract and TRF

Compound	Mangium tannin extract		TRF
	Retention time (min)	Concentration (%)	Retention time (min)	Concentration (%)
Phenol (izal)	13.2	1.83
2-Methoxyphenol, (guaiacol)	13.96	2.18
4-Methylphenol, (p-cresol)	14.25	0.74
4-Ethenyl-2-methoxyphenol	16.12	0.91
1,3-Benzenediol (pyrocatechol)	16.14	42.83
4-Ethyl-1,3-benzenediol(4-ethylresorcinol)	17.84	0.59
Trideuteroacetonitrile			5.2	78.46
Nitrogen oxide			5.6	8.94
2-Methylene-7-oxabicyclo			18.39	2.53
2-Methoxy-4-methylphenol			19.16	10.07
Total phenolic compounds		49.08		10.07