On the interference of urea with CO2/CO32- chemistry of cellulose model solutions in NaOH(aq)

Gunnarsson, Mikael; Bernin, Diana; Hasani, Merima

doi:10.1016/j.carbpol.2020.117059

Cited by 8 publications

(3 citation statements)

References 24 publications

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“…Thus, the addition of the drug caused the O–H absorption band of PVA to shift to a lower wavenumber, indicating the formation of stronger H-bonds. According to reports, urea can be used as an effective hydrogen bond breaker. , After 0.5 wt % urea was added to the PVA/drug hydrogel, the characteristic O–H stretching bands did indeed shift significantly (Figure S5). In addition, it is reported that the formation of hydrogen bonds will significantly affect the chemical shift of related hydrogen on the molecule, and there may be low-field movement. − The 1 H NMR spectra revealed the effect of H-bonds between PVA and the drug (Figure b).…”

Section: Resultsmentioning

confidence: 61%

“…According to reports, urea can be used as an effective hydrogen bond breaker. 50,51 After 0.5 wt % urea was added to the PVA/drug hydrogel, the characteristic O−H stretching bands did indeed shift significantly (Figure S5). In addition, it is reported that the formation of hydrogen bonds will significantly affect the chemical shift of related hydrogen on the molecule, and there may be low-field movement.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

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Facile Preparation of Drug-Releasing Supramolecular Hydrogel for Preventing Postoperative Peritoneal Adhesion

Song

Zhang

Shen

et al. 2021

ACS Appl. Mater. Interfaces

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Hydrogels have attracted widespread attention for breaking the bottlenecks faced during facile drug delivery. To date, the preparation of jelly carriers for hydrophobic drugs remains challenging. In this study, by evaporating ethanol to drive the formation of hydrogen bonds, hydrophilic poly(vinyl alcohol) (PVA) and certain hydrophobic compounds [luteolin (LUT), quercetin (QUE), and myricetin (MYR)] were rapidly prepared into supramolecular hydrogel within 10 min. The gelation performance of these three hydrogels changed regularly with the changing sequence of LUT, QUE, and MYR. An investigation of the gelation pathway of these hybrid gels reveals that the formation of this type of gel follows a simple supramolecular self-assembly process, called "hydrophobe−hydrophile crosslinked gelation". Because the hydrogen bond between PVA and the drug is noncovalent and reversible, the hydrogel has good plasticity and self-healing properties, while the drugs can be controllably released by tuning the output stimuli. Using a rat sidewall-cecum abrasion adhesion model, the as-prepared hydrogel was highly efficient and safe in preventing postsurgical adhesion. This work provides a useful archetypical template for researchers interested in the efficient delivery and controllable release of hydrophobic drugs.

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Section: Resultsmentioning

confidence: 61%

Section: ■ Results and Discussionmentioning

confidence: 94%

Facile Preparation of Drug-Releasing Supramolecular Hydrogel for Preventing Postoperative Peritoneal Adhesion

Song

Zhang

Shen

et al. 2021

ACS Appl. Mater. Interfaces

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“…In addition to converting amorphous cellulose into crystalline, there is also a strong chance for the fiber to swell in the presence of urea, hydrate the NaOH-treated cellulose, and dissolve the amorphous cellulose. , Eventually, reducing the loading capacity, this phenomenon may be controlled in the silica-coated fiber, namely, fiber@SiO 2 . Further previous work on aerogel shows the pore recovery property, and it is proportional to the high silica content without the loss of the surface area .…”

Section: Resultsmentioning

confidence: 99%

Porous Silica Biofiber: A Reusable, Sustainable Fertilizer Reservoir

Bindra¹,

Nagargade

Sahu³

et al. 2022

ACS Omega

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Nitrogen fertilizers, namely urea, are prone to leaching that causes inefficiency in crop production and environmental pollution; hence porous particles were explored for slow release. Nevertheless, discrete particles add cost; therefore, jute cellulose has been tested as twine to tether silica together for reusability. On the other hand, silica serves as an exoskeleton to give pore memory property to cellulose, which otherwise is susceptible to loss of porosity during irrigation. The composite shows ∼70% more absorption capacity in the fifth cycle than the fiber without silica coating. The urea release kinetics shows only <1/3 and 3/4 of urea release from the jute-silica composite compared to naked porous silica and cellulose, respectively. The slow and sustained release of fertilizer from the composite results in a continuous increase in the chlorophyll content in rice crops.

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Aerogel-like (low density and high surface area) cellulose monoliths and beads obtained without supercritical- or freeze-drying

Druel

Budtova

2023

Cellulose

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On the interference of urea with CO2/CO32- chemistry of cellulose model solutions in NaOH(aq)

Cited by 8 publications

References 24 publications

Facile Preparation of Drug-Releasing Supramolecular Hydrogel for Preventing Postoperative Peritoneal Adhesion

Facile Preparation of Drug-Releasing Supramolecular Hydrogel for Preventing Postoperative Peritoneal Adhesion

Porous Silica Biofiber: A Reusable, Sustainable Fertilizer Reservoir

Aerogel-like (low density and high surface area) cellulose monoliths and beads obtained without supercritical- or freeze-drying

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