They are normally heterofermentative and ferment glucose via the phosphoketolase pathway.
Fermentation is an anaerobic process.
Knowing that Leuconostoc belong to the lactic-acid bacteria, and that they ferment glucose under anaerobic conditions, you must be able to draw their sugar metabolism of glucose into lactic acid without too much difficulty. Argonne National Laboratory, Division of Educational Programs, Harold Myron, Ph.D., Division Director.