Počet záznamů: 1
Low-molecular-weight chitosans: Preparation and characterization
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SYSNO ASEP 0361593 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Low-molecular-weight chitosans: Preparation and characterization Tvůrce(i) Tishchenko, Galina (UMCH-V) RID
Šimůnek, Jiří (UZFG-Y) RID
Brus, Jiří (UMCH-V) RID, ORCID
Netopilík, Miloš (UMCH-V) RID
Pekárek, Michal (UMCH-V) ORCID
Walterová, Zuzana (UMCH-V)
Koppová, Ingrid (UZFG-Y) RID
Lenfeld, Jiří (UMCH-V) RIDZdroj.dok. Carbohydrate Polymers. - : Elsevier - ISSN 0144-8617
Roč. 86, č. 2 (2011), s. 1077-1081Poč.str. 5 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova low-molecular-weight chitosans ; chitooligosaccharides ; oxidative depolymerization Vědní obor RIV ED - Fyziologie CEP GA525/08/0803 GA ČR - Grantová agentura ČR CEZ AV0Z40500505 - UMCH-V (2005-2011) AV0Z50450515 - UZFG-Y (2005-2011) UT WOS 000294187400094 DOI 10.1016/j.carbpol.2011.04.073 Anotace 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%. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2012
Počet záznamů: 1