After about 3 h the optical density dropped to zero. In
the case of treatments with 0.1% chitin and chitosan, the stationary
phasewas reached at 4 to 4.5 h. A maximum optical density (OD) of
0.341 (i.e.1.023 108 cells/mL)was obtained for control. In contrast
the OD was only 0.123 (i.e. 0.369 108 cells/mL) for the 0.1% chitosan
treated samples, indicating inhibition of cell growth. While
with 0.1% chitin treated samples the maximum OD was slightly