Mechanism of sulfonation-induced chain scission of selectively oxidized polysaccharides
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14740%2F20%3A00121454" target="_blank" >RIV/00216224:14740/20:00121454 - isvavai.cz</a>
Nalezeny alternativní kódy
RIV/70883521:28610/20:63526508
Výsledek na webu
<a href="https://www.sciencedirect.com/science/article/pii/S0144861719311713?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0144861719311713?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.carbpol.2019.115503" target="_blank" >10.1016/j.carbpol.2019.115503</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Mechanism of sulfonation-induced chain scission of selectively oxidized polysaccharides
Popis výsledku v původním jazyce
Oxidation of polysaccharides to 2,3-dicarboxypolysaccharides is a two-stage process, where selective oxidation by periodate is followed by secondary oxidation by chlorite. Addition of sulfamic acid before the secondary oxidation influences the molecular weight and degree of oxidation of the product. Here, mechanism of sulfamic acid-catalysed chain scission is elucidated for selectively oxidized cellulose and dextrin. Initially, sulfamic acid sulfonates the aldehyde groups of 2,3-dialdehydepolysaccharide. Introduced -SO3H groups are in ideal position to protonate the oxygen atom of 1-4' glycosidic bond and to trigger acidic hydrolysis. This can be used to obtain a direct control over the molecular weight of the product. Observed slightly lower degree of oxidation was ascribed to the ability of sulfamic acid to scavenge the hypochlorite and thus protect the intermolecular hemiacetals from oxidation. Usually undesirable hypochlorite thus seems to be necessary for preparation of selectively oxidized polysaccharides with degree of oxidation above 90%.
Název v anglickém jazyce
Mechanism of sulfonation-induced chain scission of selectively oxidized polysaccharides
Popis výsledku anglicky
Oxidation of polysaccharides to 2,3-dicarboxypolysaccharides is a two-stage process, where selective oxidation by periodate is followed by secondary oxidation by chlorite. Addition of sulfamic acid before the secondary oxidation influences the molecular weight and degree of oxidation of the product. Here, mechanism of sulfamic acid-catalysed chain scission is elucidated for selectively oxidized cellulose and dextrin. Initially, sulfamic acid sulfonates the aldehyde groups of 2,3-dialdehydepolysaccharide. Introduced -SO3H groups are in ideal position to protonate the oxygen atom of 1-4' glycosidic bond and to trigger acidic hydrolysis. This can be used to obtain a direct control over the molecular weight of the product. Observed slightly lower degree of oxidation was ascribed to the ability of sulfamic acid to scavenge the hypochlorite and thus protect the intermolecular hemiacetals from oxidation. Usually undesirable hypochlorite thus seems to be necessary for preparation of selectively oxidized polysaccharides with degree of oxidation above 90%.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10400 - Chemical sciences
Návaznosti výsledku
Projekt
—
Návaznosti
—
Ostatní
Rok uplatnění
2020
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Carbohydrate Polymers
ISSN
0144-8617
e-ISSN
—
Svazek periodika
229
Číslo periodika v rámci svazku
FEB
Stát vydavatele periodika
GB - Spojené království Velké Británie a Severního Irska
Počet stran výsledku
10
Strana od-do
115503
Kód UT WoS článku
000501796600076
EID výsledku v databázi Scopus
2-s2.0-85075346483