About: Low-molecular-weight chitosans: Preparation and characterization

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	The chitosan depolymerization products prepared by enzymatic hydrolysis, oxidative reaction or microwave irradiation were characterized by FT-IR, MALDI TOF MS, solid state 13C CP/MAS NMR and GPC. Enzymatic hydrolysis resulted in two fractions of low-molecular-weight (LMW) chitosans with Mw 34 kDa (3.9 wt%) and 14.6 kDa (8.5 wt%). In the oxidative reaction at the hydrogen peroxide and acetic acid molar ratio equal to 1.7, two LMW chitosans with Mw 9 and 10 kDa (the deacetylation degree 69% and 94%, respectively) were isolated with the total yield 86 wt%. In microwave irradiation, the Mw of chitosan (175.5 kDa) decreased at most in two times. Two chitosan fractions with Mw 80 and 120 kDa (total yield 70 wt%) were obtained. In all cases, LMW chitosans served as fortifiers for chitosan oligomers, which were retained with the former through multiple hydrogen bonds. Their content in LMW chitosans was roughly 20–30 wt%. The chitosan depolymerization products prepared by enzymatic hydrolysis, oxidative reaction or microwave irradiation were characterized by FT-IR, MALDI TOF MS, solid state 13C CP/MAS NMR and GPC. Enzymatic hydrolysis resulted in two fractions of low-molecular-weight (LMW) chitosans with Mw 34 kDa (3.9 wt%) and 14.6 kDa (8.5 wt%). In the oxidative reaction at the hydrogen peroxide and acetic acid molar ratio equal to 1.7, two LMW chitosans with Mw 9 and 10 kDa (the deacetylation degree 69% and 94%, respectively) were isolated with the total yield 86 wt%. In microwave irradiation, the Mw of chitosan (175.5 kDa) decreased at most in two times. Two chitosan fractions with Mw 80 and 120 kDa (total yield 70 wt%) were obtained. In all cases, LMW chitosans served as fortifiers for chitosan oligomers, which were retained with the former through multiple hydrogen bonds. Their content in LMW chitosans was roughly 20–30 wt%. (en)
Title	Low-molecular-weight chitosans: Preparation and characterization Low-molecular-weight chitosans: Preparation and characterization (en)
skos:prefLabel	Low-molecular-weight chitosans: Preparation and characterization Low-molecular-weight chitosans: Preparation and characterization (en)
skos:notation	RIV/67985904:_____/11:00361593!RIV12-AV0-67985904
http://linked.open...avai/predkladatel	Ústav živočišné fyziologie a genetiky AV ČR, v.v.i.
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA525/08/0803), Z(AV0Z40500505), Z(AV0Z50450515)
http://linked.open...iv/cisloPeriodika	2
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Koppová, Ingrid Šimůnek, Jiří
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav živočišné fyziologie a genetiky AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	210040
http://linked.open...ai/riv/idVysledku	RIV/67985904:_____/11:00361593
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	low-molecular-weight chitosans; chitooligosaccharides; oxidative depolymerization (en)
http://linked.open.../riv/klicoveSlovo	chitooligosaccharides low-molecular-weight chitosans oxidative depolymerization
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[51F4A2E99B1E]
http://linked.open...i/riv/nazevZdroje	Carbohydrate Polymers
http://linked.open...in/vavai/riv/obor	ED
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	8 (xsd:int)
http://linked.open...vavai/riv/projekt	The effect of chitooligosaccharides in the human bowel
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	86
http://linked.open...iv/tvurceVysledku	Koppová, Ingrid Netopilík, Miloš Tishchenko, Galina Šimůnek, Jiří Walterová, Zuzana Brus, Jiří Lenfeld, Jiří Pekárek, Michal
http://linked.open...ain/vavai/riv/wos	000294187400094
http://linked.open...n/vavai/riv/zamer	Progresivní makromolekulární materiály a supramolekulární systémy: syntéza a studium vlastností, jevů a možností využití pro speciální aplikace a moderní technologie Genetic, functional and developmental potential of animal cells, tissues and organisms: their use in medicine, ecology and agriculture
issn	0144-8617
number of pages	5 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.carbpol.2011.04.073
is http://linked.open...avai/riv/vysledek of	Low-molecular-weight chitosans: Preparation and characterization Low-molecular-weight chitosans: Preparation and characterization

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