Werner Praznik

ORCID: 0000-0002-6872-4027
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About
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Research Areas
  • Microbial Metabolites in Food Biotechnology
  • Food composition and properties
  • Polysaccharides Composition and Applications
  • Enzyme Production and Characterization
  • Polysaccharides and Plant Cell Walls
  • Diet, Metabolism, and Disease
  • Plant nutrient uptake and metabolism
  • Freezing and Crystallization Processes
  • Seaweed-derived Bioactive Compounds
  • Botanical Research and Applications
  • Potato Plant Research
  • Forest ecology and management
  • Phytase and its Applications
  • Genetic diversity and population structure
  • Probiotics and Fermented Foods
  • Agriculture, Plant Science, Crop Management
  • Carbohydrate Chemistry and Synthesis
  • Enzyme Catalysis and Immobilization
  • Food Quality and Safety Studies
  • Forest Insect Ecology and Management
  • Enzyme Structure and Function
  • Layered Double Hydroxides Synthesis and Applications
  • Sexual function and dysfunction studies
  • Glycosylation and Glycoproteins Research
  • Magnetic and Electromagnetic Effects

University of Vienna
2013-2024

Austrian Economics Center
2018

BOKU University
2003-2013

Applied Natural Sciences
2008

University of Graz
2004

University of Agricultural Sciences, Dharwad
2002

Universitätsklinikum Tulln
1999-2001

Gregor Mendel Institute of Molecular Plant Biology
1985-1995

Ludwig Boltzmann Institute for Digital Health and Prevention
1993

Seibersdorf Laboratories (Austria)
1990

This study demonstrates the α-galactosidase activity and growth of 20 selected probiotic strains with non-digestible raffinose family oligosaccharides galactomannans.

10.1039/c7fo01887h article EN Food & Function 2018-01-01

Summary An analysis of fructan structures, to increase the understanding biosynthetic pathways and enzymology synthesis in root leaf tissues Lolium perenne is reported. Fructan extracted from stubble L. plants was analyzed by high performance anion exchange chromatography pulsed amperometric detection (HPAEC‐PAD) using a new desalting technique. Structures isomers, separated up DP16 (DP, degree polymerization), were established chromatographic elution times or GC‐MS. Fructans DP8 belonged...

10.1046/j.1469-8137.2001.00069.x article EN New Phytologist 2001-04-01

Powders of tubers from Jerusalem artichoke (Helianthus tuberosus, L.( cultivar Gigant, different harvesting times (autumn and spring) were applied in bakery products, particularly wheat/rye bread. The quality this bread was compared to with cereal flours substituted commercial products as Raftilin®ST Raftilose®P95. Compared standard bread, shows a high organoleptic evaluation (grade I 36.5 37.5 scores). In utilised powders (JAPs) the amount fructan (inulin) hydrolysis fructose during baking...

10.1002/1521-3803(20020501)46:3<151::aid-food151>3.0.co;2-4 article EN Nahrung/Food 2002-05-01

Resveratrol exerts several pharmacological activities, including anti-cancer, anti-inflammatory, cardioprotective, or antioxidant effects. However, due to its occurrence in plants more glycosidic form as piceid, the bioavailability and bioactivity are limited. The enzymatic potential of probiotics for transformation piceid resveratrol was elucidated. Cell extract from Bifidobacteria (B.) infantis, B. bifidum, Lactobacillus (L.) casei, L. plantarum, acidophilus evaluated their effect this...

10.1007/s00449-016-1662-1 article EN cc-by Bioprocess and Biosystems Engineering 2016-08-06

Selected starches, i.e. waxy maize, amaranth, quinoa, wheat, millet and buckwheat were investigated with respect to their technological properties such as gelatinization, stability mechanical stress, resistance conditions in continuous freeze/thaw cycles. Technological are correlated molecular features branching characteristics terms of iodine-complexing potential, molar mass, occupied glucan-coil volume, packing density glucan coils rheological properties. Waxy maize amaranth starches found...

10.1002/(sici)1521-379x(199906)51:6<197::aid-star197>3.0.co;2-k article EN Starch - Stärke 1999-06-01

SUMMARY We studied fructan accumulation in wheat seedlings ( Triticum aestivum L. cv. Alcedo) caused by oxygen shortage around the root. Plants were cultivated either nitrogen‐flushed or aerated nutrient solution. In response to nitrogen treatment there was an of soluble carbohydrates shoots as well roots. The main contribution due fructans. content fructo‐oligosaccharides had been increased five‐fold roots and seven‐fold shoots. This is incompatible with assumption that higher substrate...

10.1111/j.1469-8137.1993.tb03758.x article EN New Phytologist 1993-03-01

A high content (60–65% of dry mass DM) water soluble carbohydrates was found in early harvested varieties (Bella and Bianka) middle (Topstar Gigant) 22–25 weeks after plantation. In late (Waldspindel, Violet de Rennes, Rote Zonenkugel) a similar amount obtained (55–60% when 29–33 planting. There distinctive impact on maturing process as well frost period alterations which resulted conversion polymer inulin to low sucrose. / correlation between sucrose level (r = − 0.952**) with linear...

10.1021/jf0717485 article EN Journal of Agricultural and Food Chemistry 2007-10-18

The dry, powdered cladodes of Opuntia ficus-indica are often-used in over-the-counter (OTC) pharmaceutical formulations. Gentle drying techniques, such as lyophilization and vacuum compared with convection for the also another species economic importance, joconostle. heteropolysaccharide purified from mucilage extracted dried powders were investigated their monosaccharide composition (HPAEC-PAD, TLC), mineral protein content, molecular dimensions (SEC) fermentability by probiotic bacteria...

10.3390/scipharm88040043 article EN cc-by Scientia Pharmaceutica 2020-10-02

The mucilage extracted from the convection-dried cladodes of O. ficus-indica and joconostle, two species economic importance, delivered three fractions after methanol precipitation. Two were composed high molar mass polysaccharides, one included water-soluble mono-, di-, oligosaccharides. large polysaccharides have a range 4.0 × 103 to 8.0 105 g·mol-1 are consistently galactose, arabinose, xylose, rhamnose; however, content galacturonic acid was different between both species. Their...

10.1016/j.foodchem.2021.130167 article EN cc-by Food Chemistry 2021-05-21

Opuntia joconostle is a semi-wild cactus cultivated for its fruit. However, the cladodes are often discarded, wasting potentially useful mucilage in them. The composed primarily of heteropolysaccharides, characterized by their molar mass distribution, monosaccharide composition, structural features (by vibrational spectroscopy, FT IR, and atomic force microscopy, AFM), fermentability known saccharolytic commensal members gut microbiota. After fractionation with ion exchange chromatography,...

10.3390/ijms24043208 article EN International Journal of Molecular Sciences 2023-02-06
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