production on the exobiopolymer of O. nipponica BCC 2092. The lowest lactic acid production was detected on the exobiopolymer of A. samoensis BCC 2466. It is worth noting that there was no lactic acid production on all exobiopolymers after their co-cultivation with B. animalis ATCC 25527. Furthermore, the absence of lactic acid produced by B. animalis ATCC 25527 on some substrates might be due to the bacteria produced acetic acid rather than lactic acid (26).