The concentrations of furan aldehydes and aliphatic acids are included in Fig. 2. All cultures in this study did not contain hydroxy methyl furfural 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 after the 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 into the cellulose (Vandamme et al., 1998).