Table 2.

Substrate specificity of HQDO of Sphingomonas sp. strain TTNP3 (relative rate of oxygen consumption with 200 μM substrate compared to HQ as substrate)

Substrate (200 μM)	Activity (%)	SD (%)
Hydroquinone	100	12.8
Chlorohydroquinone	29	0.8
2-Methoxyhydroquinone	59	6.7
2-Methylhydroquinone	139	9.3
2-Ethylhydroquinone	83	4.3
2-Propylhydroquinone	23	2.6
2-t-Butylhydroquinone	5	0.6
2-Pentylhydroquinone	19	1.1
2-Hexylhydroquinone	<2	1.1
2-(1-methyl-1-octyl)-hydroquinone	<2	0.5