Citric Acid Used as a Cross-Linking Agent for Grafting β-Cyclodextrin onto Wool Fabric

Gawish, S. M.; Ramadan, A. M.; El-Ola, S. M. Abo; El‐Kheir, Amira Abou

doi:10.1080/03602550902824572

Cited by 37 publications

(23 citation statements)

References 10 publications

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“…Both β-CD and polysaccharides contain several reactive hydroxyl groups that can be linked by crosslinking agents. CA is a polycarboxylic acid with three carboxylic groups, which are capable of forming ester linkages with hydroxyl groups of both cellulose fibers and β-CD, thus binding the β-CD to cellulose fibers through the formed ester linkage with CA (Gawish et al 2009;Dong et al 2014). ECH has been used as a crosslinking agent for β-CD that can react with hydroxyl groups of β-CD.…”

Section: Characterization Of β-Cd-cel and β-Cd-csmentioning

confidence: 99%

β-Cyclodextrin Grafted Cellulose and Cationic Starch for Antibacterial Paper Products: A Comparative Study

Dong¹,

Li²,

Xiao³

et al. 2014

BioResources

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Two kinds of macromolecules applied in papermaking were modified with β-cyclodextrin (β-CD) and loaded with ciprofloxacin hydrochloride (CipHCl) in an attempt to compare their potential applications in antimicrobial paper. β-CD grafted cellulose (β-CD-Cel) and β-CD grafted cationic starch (β-CD-CS) were prepared by grafting β-CD onto cellulose fiber and cationic starch using citric acid (CA) and epichlorohydrin (ECH) as crosslinking agents, respectively. β-CD-Cel and β-CD-CS were both loaded with an antimicrobial agent (CipHCl) to form inclusion complexes, namely β-CD-Cel-CipHCl and β-CD-CS-CipHCl. Furthermore, the inclusion complexes were added to the pulp to prepare antibacterial paper. The antimicrobial activity and physical properties of the paper were investigated. The results showed that the paper with both inclusion complexes exhibited excellent antibacterial activity, and the antibacterial activity with β-CD-CS-CipHCl was higher than that with β-CD-CelCipHCl. Moreover, the addition of both β-CD-Cel-CipHCl and β-CD-CSCipHCl affected the tensile and tear strengths of the paper. The paper with β-CD-CS-CipHCl had better physical properties than that with β-CDCel-CipHCl because the CS acts as a reinforcing agent in papermaking. These prepared antibacterial paper sheets may be useful for preventing wound and nosocomial infections in the medical and packaging fields.

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Section: Characterization Of β-Cd-cel and β-Cd-csmentioning

confidence: 99%

β-Cyclodextrin Grafted Cellulose and Cationic Starch for Antibacterial Paper Products: A Comparative Study

Dong¹,

Li²,

Xiao³

et al. 2014

BioResources

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“…Accurately weighed wool samples20 were immersed in a freshly prepared 50% urea solution containing 3% sodium bisulfite (adjusted at pH 7) in a stoppered conical flask. The mixture was maintained at 65 ± 5°C in a thermostated water bath for 1 h with occasional shaking.…”

Section: Methodsmentioning

confidence: 99%

“…In this study, we were interested in increasing the weak binding character of chitosan to wool by covalently bonding it to wool through esterification and amide formation by poly(carboxylic acid) as a crosslinking agent and using the pad–cure method, which usually occurs near 160°C 18, 19, 20. The optimum conditions (time, temperature, and concentration) for the thermofixation of chitosan were studied.…”

Section: Introductionmentioning

confidence: 99%

Citric acid used as a crosslinking agent for the grafting of chitosan onto woolen fabric

Gawish

El-Ola

Ramadan

et al. 2011

J of Applied Polymer Sci

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Modification of woolen fabrics was done by the grafting of low-molecular-weight deacetylated chitosan in the presence of citric acid as a crosslinking agent with the pad-dry cure method at different conditions (times and temperatures). The add-on of chitosan and the optimum conditions were determined. The improved properties of modified wool by chitosan were evaluated with the urea bisulfite solubility test, crease recovery angle, yellowness index, and scanning electron microscopy. The dyeing properties of modified wool fabrics were studied with acid and reactive dyes. The biocidal activities of the modified and unmodified wool samples were evaluated and compared against some species of microorganisms, including Escherichia coli (Gram negative), Staphylococcus aureus (Gram positive), Candida albicans, and Aspergillus flavus.

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“…For instance, a number of crosslinking agents have been used by researchers for grafting βCD onto cellulose nanofibes, such as epichlorohydrin, cyanuric chloride, N‐methylol acrylamide, and polycarboxylic acids (e.g., citric acid) . However, the maximum grafting ratio reported for immobilizing βCD on cellulose nanofibres was ∼18 % (w/w) .…”

Section: Introductionmentioning

confidence: 99%

Functionalized bacterial cellulose nanowhiskers as long‐lasting drug nanocarrier for antibiotics and anticancer drugs

Khattab

Dahman

2019

Can J Chem Eng

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A nano drug carrier based on sustainable and biocompatible nanocellulose was developed for use in prolonged drug releases. The grafting of β-cyclodextrin (βCD) on bacterial cellulose nanowhiskers (BCNC) using citric acid (CA) as a green linker was performed. This led to the formation of functionalized BCNC-grafted-βCD (BCNC-g-βCD). Broad-spectrum antibiotic Ciprofloxacin (CIP) and anticancer drugs Doxorubicin (DOX) and Paclitaxel (PTX) were used as model drugs. These model drugs were conjugated to BCNC-g-βCD to form the drug-nanocarrier systems (BCNC-g-βCD-drug). The change in the nanowhiskers' surface chemistry, morphology, and crystallinity was characterized by FTIR, solid-state 13 C NMR, scanning electron microscopy (SEM), atomic force microscopy (AFM), and x-ray diffraction (XRD). The functionalized nanowhiskers showed a significant increase in the drug payloads, which ranged from 495 ±4-810 ±7 μg/mg, along with a radical improvement in the drug release profiles. For all of the developed drug-conjugated nanocarriers, the initial burst releases were reduced effectively. The observed drug releases showed a sustained and controlled manner, with cumulative releases of 75-90 % over 5-5.5 days. Nevertheless, an improved drug release performance was observed in the acidic pH of 6.4 that mimicked extracellular tumor cells. In vitro drug release data were fitted zero-order kinetic model with drug release constants (K 0 ) of 0.68, 0.74, and 0.79 μg drug/h (at pH 6.4 and 37°C) for BCNC-g-βCD-CIP, BCNC-g-βCD-DOX, and BCNC-g-βCD-PTX nanosystems, respectively. The observed higher payloads along with the slow releases of drugs from the developed nanocarrier suggests its promising potential for reducing the frequent daily dosing and minimizing systemic toxicity of loaded drugs.

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Citric Acid Used as a Cross-Linking Agent for Grafting β-Cyclodextrin onto Wool Fabric

Cited by 37 publications

References 10 publications

β-Cyclodextrin Grafted Cellulose and Cationic Starch for Antibacterial Paper Products: A Comparative Study

β-Cyclodextrin Grafted Cellulose and Cationic Starch for Antibacterial Paper Products: A Comparative Study

Citric acid used as a crosslinking agent for the grafting of chitosan onto woolen fabric

Functionalized bacterial cellulose nanowhiskers as long‐lasting drug nanocarrier for antibiotics and anticancer drugs

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