Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 6

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

Search:
in the keywords:  ENZYMATIC HYDROLYSIS
help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1

Kinetic study of enzymatic hydrolysis of tannins

100%
Pohorecki R., Galwas-Zakrzewska M.
Biotechnologia
|
2002
|
issue 2
184-192
EN
Tannins are present in many plant foods. Tannase (EC 3.1.1.20) catalyses hydrolysis of ester bonds in hydrolysable gallotannins releasing glucose and gallic acid. Enzyme was produced by Penicillium chrysogenum cultured in Czapek-Dox medium containing tannic acid. The tannic acid was used as a substrate in the enzymatic reactions. The product inhibits the enzymatic reaction. It was determined that inhibition was of the competitive type. The mathematical model (Eg. 7) and kinetic constancy describing the process were determined: KM=0,5310-4[mol/dm3], RM=1,2610-3 [mol/dm3 min], KP=2,0410-4 [mol/dm3]. The results obtained from the model well agree with those obtained experimentally.
2

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

100%
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.
3

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

80%
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

Enzymatic hydrolysis of plant mannans

80%
Prendecka M., Rogalski J., Szczodrak J.
Biotechnologia
|
2005
|
issue 1
61-78
EN
Mannan, as compounds of plant biomass, seem to be a very useful feedstock for the effective utilization in biotechnology. This is due to their abundance and renewability as well as the possibility of producing various chemical by-products, fuels, fodder and food products from this source. On the other hand, the enzymatic removal of mannans from cellulosic pulps and coffee extracts by mannanases is very important for the production of high quality paper and instant coffee. This review article presents new trends in the investigations on plant mannans and their enzymatic hydrolysis by mannanases of different origin. Particular emphasis has been laid on catalytic properties and molecular structure of different enzymes of mannanolytic complex, and on the mechanisms of their regulation and adsorption on wood fibers as well as on genes encoding particular enzymes. Most promising prospects for the practical applications of mannanases are also discussed.
5

Tannins and their enzymatic degradation

80%
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.
6

Application of pig liver esterase in organic synthesis

70%
Mroczkiewicz M., Fryszkowska A., Ostaszewski R.
Biotechnologia
|
2005
|
issue 2
32-47
EN
Pig liver esterase (PLE) is widely used as a biocatalyst in organic synthesis. The model of PLE catalytic center is discussed. Simple experimental procedure providing gram quantity of this enzyme is introduced. General aspects of PLE reactivity and selectivity are presented. The most representative chemical reactions catalyzed by PLE are shown on selected examples.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.