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1

Production of fungal and bacterial cellulase- free ?-1,4-xylanase in submerged cultivation

100%
Udeh K. O., Wesolowska-Trojanowska M., Janas Z., Targonski Z.
Biotechnologia
|
1999
|
issue 4
117-134
EN
An interest in cellulase-free ?-1,4-xylanase production has markedly increased in recent years due to its bio-friendly applications in the pulp and food industry. In the presented paper, the synthesis and function of its regulatory control system in different organisms were highlighted. The influence of various cultivation conditions such as substrate availability, temperature, pH, inducers and agitation on the formation of xylanase in relation to other enzymes was also discussed. Strain modifications by mutation and gene technology, followed by cultivation to obtain a cellulase-free ?-1,4-xylanase were also presented. In addition, applications of xylanase for bleaching in the pulp industry, clarification of beer or juice, maceration of vegetables, improvement of bread quality, liberation of fibres from hemp and flax as well as improvement of animal feeds were mentioned.
2

Microbial synthesis of xanthan gum and application

100%
Udeh K. O., Janas P., Grobelski M.
Biotechnologia
|
2002
|
issue 2
113-129
EN
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.
3

Xylitol: metabolism, microbial production and perspective in polymer substrates utilization

100%
Udeh K. O., Kordowska-Wiater M., Targonski Z.
Biotechnologia
|
1997
|
issue 3
27-37
EN
This article reviews the current concepts in microbial production of xylitol with pure D-xylose or processed lignocellulosic materials as substrates by yeast strains such as Candida tropicals, C. guilliermondii and Debaromyces hansenii. The importance of xylitol as sugar substitute and coating agent in the production and preparation of food and pharmaceutical products was presented. In addition, the metabolism of D-xylose to xylitol, physiology of the yeast strains and biotechnological parameters affecting the formation of xylitol were discussed.
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