High efficiency antimicrobial cellulose‐based nanocomposite hydrogels

Abou-Yousef, Hussein; Kamel, Samir

doi:10.1002/app.42327

Cited by 15 publications

(11 citation statements)

References 31 publications

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“…Crosslinking goes through a mechanism where two carboxylic acid groups on citric acid form an anhydride through the loss of a water molecule. Then, this anhydride reacts with a hydroxyl group on the polysaccharide to form an ester bridge [32,33].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Superabsorbent Polymers Based on Starch Aldehydes and Carboxymethyl Cellulose

et al. 2018

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Superabsorbent polymers (SAPs) are crosslinked hydrophilic polymers that are capable of absorbing large amounts of water. Commercial SAPs are mostly produced with acrylic acid that cannot be easily biodegraded. Therefore, in this study, polysaccharide-based SAPs using carboxymethyl cellulose as a major component were prepared. Starch aldehydes and citric acid were selected due to their environment-friendly, non-toxic, and biodegradable properties compared to conventional crosslinking agents. Starch aldehydes were prepared by periodate oxidation, which forms aldehyde groups by taking the places of C–OH groups at C-2 and C-3. Furthermore, starch aldehydes were analyzed through the change in FT-IR spectra, the aldehyde quantitation, and the morphology in FE-SEM images. In the crosslinking of polysaccharide-based SAPs, the acetal bridges from starch aldehydes led to a large amount of water entering the network structure of the SAPs. However, the ester bridges from citric acid interfered with the water penetration. In addition, the swelling behavior of the SAPs was analyzed by the Fickian diffusion model and the Schott’s pseudo second order kinetics model. The relationship between swelling behavior and morphology of the SAPs was analyzed by FE-SEM images. In conclusion, polysaccharide-based SAPs were well prepared and the highest equilibrium swelling ratio was 87.0 g/g.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Superabsorbent Polymers Based on Starch Aldehydes and Carboxymethyl Cellulose

et al. 2018

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“…18 The peak at 3429 cm -1 represents the OH in DCMC, compared with that at 3490 cm -1 in the spectrum of CMC, the peak at 2800 cm -1 represents the C-H stretching of aldehyde groups, and that at 1620 cm -1 belongs to the C=O of aldehyde. 24 Figure 2 reveals that the particle size of DCMC appears in the nano-range, with an average particle size between 5.5-76.7 nm. Such particle size ensures a more rapid reaction and is in agreement with the results obtained by some other researchers.…”

Section: Results and Discussion Oxidation Of Cmcmentioning

confidence: 99%

Functionalization and Cross-Linking of Carboxymethyl Cellulose in Aqueous Media

Dacrory¹,

Abou-Yousef²,

Kamel³

et al. 2019

Cellulose Chem. Technol.

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Lignocelluloses are the main components of the wastes of olive oil industrial production. Partially destoned olive wastes contain a small amount of oil and water. So, olive wastes should have lower fiber content in comparison with crude olive waste. Functionalization of cellulose extracted from olive wastes enhances its importance for production of antimicrobial materials. In this work, dialdehyde carboxymethyl cellulose (DCMC), as cross-linking agent, was successfully prepared by using periodate oxidation of carboxymethyl cellulose (CMC), which had been previously prepared from olive oil by-products. CMC was modified with hydrazine monohydrate in order to prepare carboxymethyl hydrazide (NCMC), which was reacted with DCMC through Schiff's base reaction, resulting in crosslinking of NCMC. Also, DCMC was reacted with succinic dihydrazide (SDH) through Schiff's base reaction to give CMCSH. The water uptake of the prepared samples was also studied. All the modifications and reactions were confirmed by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). Silver nanoparticles (AgNPs) were loaded onto the prepared cross-linked compounds and their loading was confirmed by EDX. The antimicrobial activities of the silver-loaded cross-linked compounds were investigated against gram-positive and gram-negative bacteria, as well as against yeasts.

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“…As expected, the PVA crystallinity index (ratio between the absorbance of the band at 1142 cm -1 and the band at 2905 cm -1 ) is lower in the blend, I PVA is ~1.45 and I PVA-CMC is ~1.36, where the presence of NaCMC diminishes the PVA chains ability to pack into crystals [43] . The PVA-CMC layers revealed that the increase of freeze-thawing cycles displaced the band at 1593 cm -1 (NaCMC's ν(-COO) [44] ) to 1566 cm -1 , which indicate the effectiveness of the "crosslinking" [45] . In addition, the two bands at 1087 cm -1 (PVA's δ(C-O-H) [46] ) and at 1060 cm -1 (NaCMC's ν(OCH-O-CH 2 ) [47] ) cannot be distinguished in layers submitted to more freeze-thawing cycles, where only one band at 1087 cm -1 can be observed.…”

Section: Physico-chemical Analysismentioning

confidence: 95%