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Chemically modified cellulose nanocrystals as polyanion for preparation of polyelectrolyte complex. Repositório Alice
VASCONCELOS, N. F.; FEITOSA, J. P. A.; ANDRADE, F. K.; MIRANDA, M. A. R.; SASAKI, J. M.; MORAIS, J. P. S.; SILVA, L. M. A. e; CANUTO, K. M.; ROSA, M. de F..
Bacterial cellulose nanocrystals (BCNCs) have hydrophilic surfaces due to hydroxyl groups but are water-insoluble. The carboxymethylation improves the solubility of cellulose in polar media through the insertion of carboxymethyl groups. This study aims to evaluate the use of two different alcoholic solvents in the carboxymethylation reaction of BCNCs: ethanol and isopropanol. BCNCs were obtained under two hydrolysis conditions: sulfuric acid (BCNC-S) and combination of sulfuric and hydrochloric acids (BCNC-S/Cl). Two techniques (NMR and titration) were used to determine the degree of substitution (DS) values. Carboxymethylation of BCNC-S/Cl led to high DS compared to BCNC-S and the use of isopropanol promoted an even greater DS. The thermal properties were...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Carboxymethylation; Polyelectrolytic complexes; Hydrolysis; Nanocrystals; Chitosan.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1118682
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สมบัติทางเคมีกายภาพและการเป็นสารช่วยแตกตัวในยาเม็ดของแป้งข้าวเจ้าคาร์บอกซีเมทิลเชื่อมขวางด้วยอิพิคลอโรไฮดริน Thai Agricultural
Nisit Kittipongpatana; Ornanong Kittipongpatana.
Cross-linked carboxymethyl rice starches (CL-CMRSs) were prepared from reactions between native rice starch and varied concentrations (0.1 to 15%w/w) of epichlorohydrin (ECH) in a simultaneous carboxymethylation-crosslinking reaction setup using methanol as solvents. The degree of carboxymethyl substitution was between 0.24 to 0.28, while amylose content decreased drastically from native starch. SEM images showed minor change on the granule surface, while XRD profiles indicated slight loss of crystallinity. In contrast, the water uptake (WU) and free swelling capacity (FSC) of CL-CMRSs increased significantly, compared to native starch, as a result of the modification. CMRSs cross-linked with 2% (M-2) and 3% (M-3) ECH yielded FSC values of 8.6 and 9.6 g/g,...
Tipo: PhysicalObject Palavras-chave: Rice starch; Cross-linking; Carboxymethylation; Epichlorohydrin; Tablet disintegrant properties; แป้งข้าว; การเชื่อมขวาง; คาร์บอกซีเมทิล; อิพิคลอโรไฮดริน; สารช่วยแตกตัว; สมบัติทางเคมีกายภาพ; ยาเม็ด.
Ano: 2012 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5428
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