TABLE 1.

Characterization of substrates and intermediates of dibenzofuran degradation by T. mucoides SBUG 801

Compound	Metabolite	UV absorption maxima (nm)a	Characteristic mass ions (m/z)
DBFb		249, 279, 294(s)	168 [M+], 139 [M]-CHO
1-Hydroxy-DBF	I	224, 256, 268, 274, 298, 306	184 [M+]; 155 [M]-CHO, 128 [M]-COC2H4
2-Hydroxy-DBF	III	251, 289, 317(s)	184 [M+], 155 [M]-CHO, 128 [M]-COC2H4
3-Hydroxy-DBF	II	213, 231, 253, 297	184 [M+], 155 [M]-CHO, 128 [M]-COC2H4
4-Hydroxy-DBF	IV	224(s), 255, 279, 295/305(s)	184 [M+], 155 [M]-CHO, 128 [M]-COC2H4
2,3-Dihydroxy-DBF	V	216, 247, 298, 313	200 [M+], 171[M]-CHO, 126 [M]-CH2O-CH2O-CH2
Ring cleavage product	VI	242, 329	290 [M+], 259 [M]-OCH3, 231 [M]-COOCH3, 216 [M]-COOCH3-CH3c

^as, shoulder. 

^bDBF, dibenzofuran. 

^cMethyl derivative.