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1

Dextran and dextranase - microbial sources, properties and applications

100%
Pleszczynska M.
Biotechnologia
|
1999
|
issue 4
45-61
EN
Dextran is a bacterial polysaccharide composed almost exlusively of the monomeric unit a-1,6-glucopyranose linked mainly by a-1,6-bonds. Enzymatic hydrolysis of dextran is carried out with the enzyme dextranase. This paper is a review of world-wide literature concerning properties and production of dextran and dextranase. The important part of the article is the discussion about their significant role and real or potential applications in industry and medicine.
2

Tannins and their enzymatic degradation

63%
Pleszczynska M., Szczodrak J.
Biotechnologia
|
2005
|
issue 1
152-165
EN
Tannins as compounds of plant biomass seem to be a very useful raw material for an effective bioconversion. This is due to their abundance and renewability as well as the possibility of producing various chemicals and curative preparations from this source. On the other hand, enzymatic removal of tannins from agricultural feedstocks by tannase is very important for production of digestible feed and food products, clarified beverages and fruit juices or instant tea. This article presents a review of information on tannins and their hydrolysis by microbial tannase. Special attention has been paid to chemical structure of tannins and their negative or positive effects on organisms as well as the production of tannase and its biochemical properties. Most promising prospects for the practical applications of tannase in food, pharmaceutical, cosmetic and leather industries are also discussed.
3

alpha (13)-Glucan-degrading enzymes. Part I ? Microbial sources, production, properties, genetics

51%
Wiater A., Pleszczynska M., Szczodrak J.
Biotechnologia
|
2006
|
issue 2
206-220
EN
This paper is the first review article concerning the investigations on alpha-(13)-glucans and their enzymatic hydrolysis by specific alpha-(13)-glucanases. Special attention is paid to microbial sources of these enzymes as well as intensification of their production in cultures, their purification and catalytic properties, and molecular structure of the genes encoding different fungal and bacterial alpha-(13)-glucanases.
4

alpha-(1->3)-Glucans from cell wall of Laetiporus sulphureus (Bull.:Fr.) Murrill ? isolation, characteristics and application for induction of mutanase synthesis

51%
Wiater A., Pleszczynska M., Szczodrak J., Prochniak K.
Biotechnologia
|
2008
|
issue 2
174-189
EN
Five different methods described in the literature were used for the isolation of alpha-(1->3)-glucans from the cell wall of fruiting bodies of Laetiporus sulphureus (Bull.:Fr.) Murrill, and their comparative analysis was performed. The separated fungal biopolymers were well-characterized in respect of their structure and some physicochemical properties. Structural analyses, i.e., Fourier-transform infra-red (FT-IR) spectroscopy, 1H nuclear magnetic resonance (NMR) spectroscopy and specific rotation, revealed that the alkali-soluble wall fraction from this basidiomycetous fungus contained about 56% of (1->3)-linked alpha-glucans. Four out of five alpha-(1->3)-glucans isolated by different methods from the mycelium of the polypore fungus L. sulphureus induced higher activity of fungal and bacterial mutanase than those obtained on mutan. Therefore, the alpha-(1->3)-glucans from fruiting bodies of L. sulphureus can be used as a new alternative to streptococcal mutan, which so far has been known as the best inducer of mutanase production
5

alpha (13)-Glucan-degrading enzymes. Part II ? Application in biotechnology

51%
Wiater A., Pleszczynska M., Szczodrak J.
Biotechnologia
|
2006
|
issue 2
221-233
EN
This paper is focused on actual and potential applications of mutanases as enzymatic dental plaque control agents in vitro and in vivo. All studies reported so far have demonstrated that mutanase was effective in preventing dental caries, suppressing the glucan-dependent adherence and the accumulation of microorganisms in dental plaque, and removing biofilms from dentures. In addition to their potential usefulness in dentistry as oral therapeutic agents, alpha-(13)-glucanases might be applicable to investigations of alpha-(13)-glucosidic linkages occurring in microbial cell-wall structures and glucans of certain higher plants. alpha-(13)-Glucanases obtained in a pure form are invaluable tools for studying the chemical structures of carbohydrates. Most promising prospects for the practical applications of alpha-(13)-glucanases in biocontrol of phytopatogenic fungi, as well as in efficient production of fungal protoplasts, are also discussed.
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