Influence of temperature, pH and simulated biological solutions on swelling and structural properties of biomineralized (CaCO3) PVP–CMC hydrogel

Shah, Radhika; Saha, Nabanita; Sáha, Petr

doi:10.1007/s40204-015-0043-1

Cited by 34 publications

(23 citation statements)

References 29 publications

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“…Figure represents the swelling trend of the St‐Ch 50 hydrogel in the solutions of distilled water, glucose, and urea. It can be revealed that the binding of glucose moieties with the hydrogel gradually leads to an increase of the charge density within the hydrogel, hence increases the hydrophilicity within the hydrogel, which finally leads to the rise in the swelling capacity . Similar to the glucose solution, the same trend of swelling behavior is observed in the urea solution.…”

Section: Resultsmentioning

confidence: 67%

“…This could be because of the presence of hydroxyl groups of starch, amino groups of chitosan, and carboxyl groups of CA. In pH = 7.5, water molecules undergo H 2 bonding so more space is generated for the molecules to penetrate inside, thus the material swells more . Figure represents the swelling trend of the St‐Ch 50 hydrogel in the solutions of distilled water, glucose, and urea.…”

Section: Resultsmentioning

confidence: 99%

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Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Peidayesh

Ahmadi

Khonakdar

et al. 2020

Polymers for Advanced Techs

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Citric acid (CA)-modified hydrogels from corn starch and chitosan were synthesized using a semidry condition. This strategy has great benefits of friendly environment because of the absence of organic solvents and compatible with the industrial process. The hydrogel blends were prepared with starch/chitosan ratios of 75/25, 50/50, and 25/75. The thermal stability, morphology, water absorption, weight loss in water, and methylene blue absorption were determined. Multi-carboxyl structure of CA could result in a chemical cross-linking reaction between starch, chitosan, and CA. The cross-linking reaction between free hydroxyl groups of starch, amino groups of chitosan, and carboxyl groups of CA has been confirmed by attenuated total reflectance infrared (ATR-IR) spectroscopy, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) analysis. The water absorption properties of CA-modified hydrogel blends were increased significantly compared with the native starch and chitosan. Moreover, the hydrogel blends modified with CA showed good water resistance and gel content. The morphology study confirmed the complete chemical cross-linking and porous structure of hydrogel blends. The hydrogel blend with the starch/chitosan ratio of 50/50 presented powerful absorption of methylene blue as well as chemical cross-linking reaction and dense structure. In sum, the hydrogel blend comprising 50% starch and 50% chitosan has the potential to be applied for water maintaining at large areas, for example, in agriculture. K E Y W O R D S chitosan, citric acid, crosslinking, hydrogel, starch 1 | INTRODUCTION Hydrogels are extremely hydrophilic polymer networks, either synthetic (petrochemical based) or natural (biopolymers), which are usually stabilized through covalent bonds or noncovalent interactions among the macromolecule chains known as cross-linking. 1-4 Hydrogels will swell when placed in water and can retain an extensive fraction of water within their spatial structures without dissolving. 5 A gel structure forms within the polymer melt after cross-linking. Currently, a wide range of natural polymer hydrogels such as starch, chitosan, collagen, and cellulose have been described as suitable biomaterials for pharmaceutical and biomedical applications because of their biocompatibility, low-toxicity, and biodegradability. 6-10Starch and its derivatives have attracted many researchers for expanding biopolymer industries since they are cost-effective, renewable, abundant in nature, and biodegradable. 11-14 However, some limitations exist in the properties of starch including poor mechanical properties, high hydrophilicity, fragility, and poor dimensional stability. [15][16][17][18][19] To improve the quality and also broaden the application areas of starch, these drawbacks need to be reduced significantly.Chitosan, isolated from chitin, is another polysaccharide that is abundant in nature and available in large quantities. Chitosan is biocompatible, biodegradable, biofunctional, and antimicrobial. [20][21][22] Mo...

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Section: Resultsmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Peidayesh

Ahmadi

Khonakdar

et al. 2020

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…Gómez-Carracedo et al The first endotherm with a heat of fusion 89.74 J/g, can be attributed to the evaporation of unbound water in the crosslinked polymer and second endotherm (108.6 J/g) can be due to anhydride formation in the polymer. [52]…”

Section: Characterizationmentioning

confidence: 99%

Functionalization of carbopol with NVP for designing antibiotic drug loaded hydrogel dressings for better wound management

Singh

Dhiman

2019

J Pharm Biopharm Res

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In the present work an attempt has been made to design the antibiotic drug loaded carbopolpoly(NVP) based hydrogel wound dressings for better wound care. The polymer films were characterized by SEM-EDX, AFM, FTIR, 13 CNMR, TGA/DTA/DTG, DSC, and swelling studies. Besides drug release, various biomedical properties (viz. blood compatibility, mucoadhesion, oxygen permeability, water vapour transmission rate, microbial penetration, tensile strength, bursting strength, resilience, stress relaxation, and folding endurance) have also been studied. The polymer films have been observed to be biocompatible, permeable to oxygen and water vapour and have absorbed simulated wound fluid 11.37±0.31g/g of polymer film. The drug release profile followed the Case-II diffusion mechanism and release profile best fitted in Hixson-Crowell's kinetic models. Mechanical properties results showed that the polymer film had 0.65±0.12 Nmm −2 tensile strength, 119.38±14.26% elongationand 25.49±0.72% resilience.

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“…Some researchers studied the hydrothermal effect on the static and dynamic mechanical properties of CMC/PVP hydrogel films for using them as a food packaging material . Whereas, other researchers synthesized CaCO 3 ‐based bio‐mineralized CMC/PVP hydrogels and studied their swelling, structural and visco‐elastic behavior . In addition, CMC/PVP hydrogels synthesized by

γ

‐rays irradiation for the potential application in agriculture and wound dressing were also reported.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of PbO/carboxymethyl cellulose/polyvinylpyrrolidone nanocomposite films

et al. 2017

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Lead oxide nanoparticles (PbO NPs) and carboxymethyl cellulose (CMC)/polyvinylpyrrolidone (PVP) nanocomposite films were prepared by sol‐gel and solution casting methods respectively. The structural properties of the samples were investigated by X‐ray diffraction (XRD), high‐resolution transmission electron microscopy (HR‐TEM) and Fourier transformation infrared spectroscopy (FTIR). Scanning electron microscopy (SEM) revealed the good dispersion of PbO NPs on the surface of the blend films. CMC film exhibits a transmittance (T) of 72%, increased after mixing with PVP and then decreased to <38% after adding 4.0 wt% PbO NPs. Both the direct and indirect optical band gaps (Eg) of CMC equal to 3.97 and 3.7 eV, respectively. These values were increased after PVP addition and then decreased after loading PbO NPs. The conduction mechanism in CMC/PVP blend has changed from Schottky emission to Poole–Frenkel due to the effects of temperature and PbO NPs content. The effect of adding PVP & PbO NPs on the DC conductivity and the activation energy Ea values of the CMC are discussed. The dielectric constant (ε′) was investigated in the frequency and temperature ranges of 1 kHz–1.0 MHz and 293–393 K respectively. Its values depend on both the PbO content and temperature. The AC conductivity σac was increased with increasing PbO content. The correlated barrier hopping (CBH) was found to be the most appropriate mechanism for explaining the AC conduction behavior. POLYM. COMPOS., 39:3712–3725, 2018. © 2017 Society of Plastics Engineers

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Influence of temperature, pH and simulated biological solutions on swelling and structural properties of biomineralized (CaCO3) PVP–CMC hydrogel

Cited by 34 publications

References 29 publications

Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Functionalization of carbopol with NVP for designing antibiotic drug loaded hydrogel dressings for better wound management

Preparation and characterization of PbO/carboxymethyl cellulose/polyvinylpyrrolidone nanocomposite films

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