The concentrations of furan aldehydes and aliphatic acids areincluded in Fig. 2. All cultures in this study did not contain hydroxymethylfurfural which is one of the major inhibitors for Bacterial cellulose production. Fig. 2 shows that furfural disappeared after the cultivation and it is probable that Acetobacter xylinus 23769 is able to convert furfural, perhaps to furoic acid or to furfuryl alcohol, during the cultivation (Guo et al., 2013). Guo et al. (2013) also believe that the decrease in the concentration of furfural in cultures that produced Bacterial cellulose is probably attributed to a combination of bioconversion and evaporation. Most of the acetic and lactic acids were consumed afterthe cultivation and it has been reported that acetic acid-derived ATP may save part of the d-glucose, normally used to synthesize ATP, leading to more efficient glucose incorporation in to the cellulose (Vandamme et al., 1998). More than half of the lactic acidin all cultures except pH 8 at 26 and 28◦C was consumed. Fig. 2 also shows that acetic acid was more easily metabolized than lacticacid by Acetobacter xylinus 23769. The glycolic acid and formic acid concentration increased after cultivation. Amounts of acetic acid, glycolicacid, lactic acid and formic acid increased slightly during autoclaving compared to Hot water extract before autoclaving which can be attributedto sugar degradation during thermal treatment. Guo et al. (2013)observed similar phenomena. The effect of pH and temperature on the concentrations of four monosaccharides and five inhibitorswere negligible.