One of the main drawbacks of the intermittent/batch fermentation mode is the time needed by bacteria to get used to new fermentation conditions and nutrients.Therefore, in view of the typical demand of a product for industrial applications, a continuous or at least semicontinuous fermentation mode will be required. Several authors are currently studying different operation modes focusing on the highest productivity. C¸ akar and O¨ zer[225] optimized a static semicontinuous operation mode for K. xylinus FC01, finding the highest productivity of 1.637 g/L by changing the culture volume with 1/22 ratio in 7 days.Fed-batch fermentation has been also tried by Bae and Shoda [108], who cultured K. xylinus BPR2001 keeping the levels of sugar at 20 g/L by the addition of small amounts of molasses (6.3 g/h). Shezad et al. proved the increment in the yield with K. hansenii PJK and evaluatedthe difference in the properties of both BC produced by batch and continuous mode [226,227]. Despite CrI and DP being not much affected, tensile strength was strongly reduced, from 76.7 to 19.8 MPa.