Sborník abstraktů 2010 - Fakulta chemická - Vysoké učení technické ...

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A comparison of dietary exposure of acrylamide in the Czech and the Slovak Republics Lucie Marková Zuzana Ciesarová, Kristína Kukurová, Peter Šimko 1 Brno University of Technology, Faculty of Chemistry, I nstitute of Food Science and Biotechnology Purkyňova 118, 612 00 Brno, Czech Republic xcmarkova@fch.vutbr.cz Acrylamide is a known health hazardous and potentially carcinogenic compound which is formed naturally in many carbohydrate-rich food products during their heat processing. Besides coffee and potato specialties like potato chips and crisps there is a wide range of cereal based products (bread, crisp bread, cookies, crackers, cakes, gingerbreads, breakfast cereals) which substantially contribute to human exposure of acrylamide. Due to a wide occurrence of acrylamide in many staple cereal and potato based foods the exposure to acrylamide cannot be omitted. This study is focused on the evaluation of the preliminary survey on the acrylamide exposure from foods with a supposed higher acrylamide level in the group of high school students in the Czech and Slovak Republics and a comparison of acrylamide exposure in these two countries. A frequency and a distribution of consumption of foods during a day were ascertained by standardized interview using a questionnaire. The data were evaluated depending on gender, time of day consumption and the country of origin. In the group of high school students from the Czech Republic the same intake of acrylamide 2.65 µg per kg of body weight daily for boys and girls was observed. In the group of boys from the Slovak Republic the intake of acrylamide was 10% higher than in group of high school students from the Czech Republic. In contrast, girls from the Slovak Republic were burdened with acrylamide 15% less than high school students from the Czech Republic. Keywords: acrylamide, exposure, thermally treated foods
Novel Biodegradable Macromonomers Based on PLGA-PEG-PLGA Copolymer for Regenerative Medicine Lenka Michlovská Lucy Vojtová, Ludmila Mravcová, Josef Jančář Brno University of Technology, Faculty of Chemistry, Institute of Materials Chemistry, Purkyňova 118, 612 00 Brno, Czech Republic xcmichlovska@fch.vutbr.cz Biodegradable thermosensitive poly(D,L-lactic acid-co-glycolic acid)-bpoly(ethylene glycol)-b-poly(D,L-lactic acid-co-glycolic acid) (PLGA-PEG-PLGA) triblock copolymers were synthesized via ring opening polymerization. Reaction kinetics were evaluated in order to found that purification of monomers (lactide and glycolide) have important effect on copolymer properties such as predicted molecular weight and narrow polydispersity obtained at high monomer conversion. PLGA-PEG-PLGA copolymer was subsequently modified in “one pot” by itaconic anhydride (ITA) in order to functionalize both ends with carboxylic acid groups and reactive double bonds. Both unmodified copolymer and novel ITA/ PLGA-PEG-PLGA/ITA macromonomers are soluble in water forming free-flowing solution that spontaneously gels as the temperature increases generating a waterinsoluble physical hydrogel. Sol-gel transitions of polymers were investigated by test tube inverting method. Although, the critical gel concentrations of both the PLGA-PEG-PLGA and ITA-PLGA-PEG-PLGA-ITA aqueous solutions were found to be equal to 6 wt.% and the critical gel temperature decreased only from 38 °C to 36 °C by ITA modifying, ITA/PLGA-PEG-PLGA/ITA macromonomers showed sol-gel diagrams approached more to body temperature (37 °C) make the polymer useful in biomedicine already from the concentration of 6 wt.% Novel ITA/PLGA-PEG-PLGA/ITA macromonomers having crosslinkable double bonds and functional carboxyl groups suitable for coupling with bioactive materials might be used as injectable resorbable polymers for tissue regeneration. Keywords: kinetics of polymerization; functionalization; sol-gel transitions; kinetics of polymerization; functionalization; sol-gel transitions; biodegradable polymers; poly(ethylene glycol); poly(lactic-co-glycolic acid)
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STUDENTSKÁ ODBORNÁ KONFERENCE CHE
Page 3 and 4: Obsah - Contents Sekce středoškol
Page 5 and 6: Porovnanie rôznych predseparačný
Page 7 and 8: Sekce středoškolských studentů
Page 9 and 10: Vliv organické a anorganické form
Page 11 and 12: Studium vlastostí materiálů v ok
Page 13 and 14: Měření obsahu radonu v přírodn
Page 15 and 16: Stanovení biogenních aminů a pol
Page 17 and 18: Efekt snížené exprese APE u lids
Page 19 and 20: Vliv aplikace přípravku Supergest
Page 21 and 22: Stanovení obsahu mastných kyselin
Page 23 and 24: Izolace polyfenolických glykosidů
Page 25 and 26: Problematika stanovení léčiv v o
Page 27 and 28: Sekce studentů bakalářských a m
Page 29 and 30: Zmeny v obsahu organickej hmoty v p
Page 31 and 32: Vliv způsobu přípravy systémy b
Page 33 and 34: Biopolymerní hydrogely s obsahem h
Page 35 and 36: Interakce hyaluronan-tenzid za níz
Page 37 and 38: Production of Polyhydroxyalkanoates
Page 39 and 40: Zhodnocení odpadového hospodářs
Page 41 and 42: Sekce studentů doktorských studij
Page 43 and 44: The Influence of Different Hydrothe
Page 45 and 46: Analysis of casein content in cow m
Page 47 and 48: Image Analysis of Screen Printed Co
Page 49 and 50: Fluorescence Probe Study of Potenci
Page 51 and 52: Application of physico-chemical met
Page 53: Monosaccharide anhydrides in PM1 an
Page 57 and 58: The Kinetics of Al-Si Spinel Phase
Page 59 and 60: Markers for organic, conventional w
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Sborník abstraktů 2010 - Fakulta chemická - Vysoké učení technické ...

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