Search results

Sort By:

Limit search:

Microbial synthesis of xanthan gum and application

100%

Udeh K. O., Janas P., Grobelski M.

Biotechnologia

2002

issue 2

113-129

This paper deals with microbial synthesis of xanthan gum by Xanthamonas campestris strains and its applications in various industrial processes. The proposed biosynthetic pathway of xanthan synthesis by X. campestris strains and biotechnological methods of improving xanthan production were discussed. The biotechnological parameters for efficient improvement of xanthan yield and productivity such as agitation rate, pH, temperature and various additives were described. Furthermore, the applications of xanthan gum in the food, pharmaceutical, textile, oil drilling and cosmetic industries were presented.

The effect of xylose, galactose and sorbose on the production of selected extracellular enzymes by mutant-strain Trichoderma reesei M-7 during continuous cultivation

100%

Janas P., Zdzislaw T. P., Mleko S.

Biotechnologia

2002

issue 1

195-207

The effect of xylose, galactose and sorbose on the production of cellulases, xylanases, lytic enzymes and beta-galactosidase by mutant ?strain Trichoderma reesei M-7 was analysed. The aforementioned sugars were used separately and in the form of mixtures with lactose as the source of carbon during continuous cultivation of mutant M-7. Feeding medium containing mixtures of xylose and lactose in the ratio of 0,25/0,75% and 0,5/0,5% induced an increased synthesis of xylanases. Increased xylanolytic activity (about 12-27%) with the xylose/glucose ratio of 0,25/0,75% and a significantly increased activity (about 2,5 fold) with the ratio of both sugars of 0,5/0,5% was observed in comparison with continuous cultivation in the presence of 1% of lactose in the medium. Reduced synthesis of all cellulolytic (FPU, ?-1,4-endoglucanase, ?-glucosidase) and xylanolytic enzymes correlated with the increased galactose concentration in the feeding medium. Galactose also repressed the production of ?-galactosidase of the mutant-strain M-7. The results obtained after continuous cultivation with sorbose and lactose showed that sorbose was a worse inducer of synthesis of cellulolytic enzymes than lactose.

Refine search results

2 Biotechnologia

2 2002

2 Janas P.

1 Grobelski M.

1 Mleko S.

1 Udeh K. O.

1 Zdzislaw T. P.

Search results

Microbial synthesis of xanthan gum and application

The effect of xylose, galactose and sorbose on the production of selected extracellular enzymes by mutant-strain Trichoderma reesei M-7 during continuous cultivation