Abstract: Different carbon source in medium affected the cell growth, the ice nucleation activity and the gum ratio. Maltose,sorbitol and sucrose promoted the cell growth. Maltose as the carbon source, the gum ratio was less than such about ten timesin other carbons source as glucose and sucrose. Wort as the substitute of maltose can depress the gum ratio, but the effect not asgood as maltose. Addition of 0.1% lactate in the medium can inhibit the gum production effectively, and not too affected the icenucleation activity and the biomass.

Key words: ice nucleation-active bacteria, maltose, lactic acid, depress, xanthan gum