Preparation and characterization of ionic and non-ionic surfactants impregnated κ-carrageenan hydrogel beads for investigation of the adsorptive mechanism of cationic dye to develop for biomedical applications

Porous chitosan/brushite composite scaffolds were prepared by a freeze-drying technique, starting from brushite suspensions in chitosan solutions. The obtained scaffolds showed a regular macroporous and interconnected structure with brushite particles uniformly distributed in the chitosan matrix. The variation of the brushite concentration affected the microstructure of the final freeze-dried scaffold, in particular, its porosity and its average pore size. The yield strengths of the composite scaffolds could also be improved by the increase of the brushite content.

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Synthesis of a New Phosphonate-Based Sorbent and Characterization of Its Interactions with Lanthanum (III) and Terbium (III)

Polymers ◽

10.3390/polym13091513 ◽

2021 ◽

Vol 13 (9) ◽

pp. 1513

Author(s):

Yuezhou Wei ◽

Khalid A. M. Salih ◽

Mohammed F. Hamza ◽

Toyohisa Fujita ◽

Enrique Rodríguez-Castellón ◽

...

Keyword(s):

High Tech ◽

Low Grade ◽

Acid Solutions ◽

Hydrogel Beads ◽

Secondary Sources ◽

Composite Sorbents ◽

Synthesis Procedure ◽

New Generation ◽

Mild Acid

High-tech applications require increasing amounts of rare earth elements (REE). Their recovery from low-grade minerals and their recycling from secondary sources (as waste materials) are of critical importance. There is increasing attention paid to the development of new sorbents for REE recovery from dilute solutions. A new generation of composite sorbents based on brown algal biomass (alginate) and polyethylenimine (PEI) was recently developed (ALPEI hydrogel beads). The phosphorylation of the beads strongly improves the affinity of the sorbents for REEs (such as La and Tb): by 4.5 to 6.9 times compared with raw beads. The synthesis procedure (epicholorhydrin-activation, phosphorylation and de-esterification) is investigated by XPS and FTIR for characterizing the grafting route but also for interpreting the binding mechanism (contribution of N-bearing from PEI, O-bearing from alginate and P-bearing groups). Metal ions can be readily eluted using an acidic calcium chloride solution, which regenerates the sorbent: the FTIR spectra are hardly changed after five successive cycles of sorption and desorption. The materials are also characterized by elemental, textural and thermogravimetric analyses. The phosphorylation of ALPEI beads by this new method opens promising perspectives for the recovery of these strategic metals from mild acid solutions (i.e., pH ~ 4).

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Synthesis and characterization of novel protein nanodots as drug delivery carriers with an enhanced biological efficacy of melatonin in breast cancer cells

RSC Advances ◽

10.1039/d0ra08959a ◽

2021 ◽

Vol 11 (16) ◽

pp. 9076-9085

Author(s):

Kanchan Yadav ◽

Megha Das ◽

Nurul Hassan ◽

Archana Mishra ◽

Jayeeta Lahiri ◽

...

Keyword(s):

Breast Cancer ◽

Drug Delivery ◽

Cancer Cells ◽

Live Cell Imaging ◽

Biomedical Applications ◽

Breast Cancer Cells ◽

Cell Imaging ◽

Synthesis And Characterization ◽

Novel Protein

A novel nanodot-using protein has been synthesized for the live cell imaging and drug delivery of melatonin in breast cancer cells. Its unique properties hold potential for various biomedical applications in the field of bioimaging and drug delivery.

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Surface characterization of mesoporous biomass activated carbon modified by thermal chemical vapor deposition and adsorptive mechanism of nitrate ions in aqueous solution

Colloids and Surfaces A Physicochemical and Engineering Aspects ◽

10.1016/j.colsurfa.2021.126213 ◽

2021 ◽

pp. 126213

Author(s):

Jinghan Yuan ◽

Yoshimasa Amano ◽

Motoi Machida

Keyword(s):

Aqueous Solution ◽

Activated Carbon ◽

Chemical Vapor Deposition ◽

Vapor Deposition ◽

Surface Characterization ◽

Chemical Vapor ◽

Thermal Chemical Vapor Deposition ◽

Nitrate Ions ◽

Adsorptive Mechanism

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Characterization of a calcium phosphate–TiO2 nanotube composite layer for biomedical applications

Materials Science and Engineering C ◽

10.1016/j.msec.2011.02.009 ◽

2011 ◽

Vol 31 (5) ◽

pp. 906-914 ◽

Cited By ~ 84

Author(s):

A. Roguska ◽

M. Pisarek ◽

M. Andrzejczuk ◽

M. Dolata ◽

M. Lewandowska ◽

...

Keyword(s):

Calcium Phosphate ◽

Biomedical Applications ◽

Composite Layer ◽

Tio2 Nanotube

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Preparation and characterization of poly (ethylene glycol) grafted Ca-alginate fibers by γ-irradiation for biomedical applications

Journal of Adhesion Science and Technology ◽

10.1080/01694243.2012.705099 ◽

2013 ◽

Vol 27 (2) ◽

pp. 216-226 ◽

Cited By ~ 3

Author(s):

Md. Kamal Khan ◽

Mohammed Mizanur Rahman ◽

Bodrun Nesa ◽

Romana Nasrin ◽

Swajal Molla ◽

...

Keyword(s):

Ethylene Glycol ◽

Biomedical Applications ◽

Poly Ethylene Glycol ◽

Γ Irradiation ◽

Alginate Fibers ◽

Poly Ethylene ◽

Ca Alginate

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Preparation and characterization of caprine bone derived mineral substituted hydroxyapatite/phyllanthus acidus extract for biomedical applications

Materials Today Proceedings ◽

10.1016/j.matpr.2021.07.499 ◽

2021 ◽

Author(s):

P. Sadiqbasha ◽

R. Sivakumar ◽

M. Arunpandian ◽

C. Ramalingan ◽

D. Gopi ◽

...

Keyword(s):

Biomedical Applications ◽

Phyllanthus Acidus

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Characterization of Epigallocatechin-Gallate-Grafted Chitosan Nanoparticles and Evaluation of Their Antibacterial and Antioxidant Potential

Polymers ◽

10.3390/polym13091375 ◽

2021 ◽

Vol 13 (9) ◽

pp. 1375

Author(s):

María J. Moreno-Vásquez ◽

Maribel Plascencia-Jatomea ◽

Saúl Sánchez-Valdes ◽

Judith C. Tanori-Córdova ◽

Francisco J. Castillo-Yañez ◽

...

Keyword(s):

Biomedical Applications ◽

Food Packaging ◽

Inhibitory Concentration ◽

Antioxidant Activities ◽

Bacterial Species ◽

Chitosan Nanoparticles ◽

Epigallocatechin Gallate ◽

Antioxidant Power ◽

Ferric Reducing Antioxidant Power

Nanoparticles based on chitosan modified with epigallocatechin gallate (EGCG) were synthetized by nanoprecipitation (EGCG-g-chitosan-P). Chitosan was modified by free-radical-induced grafting, which was verified by Fourier transform infrared (FTIR). Furthermore, the morphology, particle size, polydispersity index, and zeta potential of the nanoparticles were investigated. The grafting degree of EGCG, reactive oxygen species (ROS) production, antibacterial and antioxidant activities of EGCG-g-chitosan-P were evaluated and compared with those of pure EGCG and chitosan nanoparticles (Chitosan-P). FTIR results confirmed the modification of the chitosan with EGCG. The EGCG-g-chitosan-P showed spherical shapes and smoother surfaces than those of Chitosan-P. EGCG content of the grafted chitosan nanoparticles was 330 μg/g. Minimal inhibitory concentration (MIC) of EGCG-g-chitosan-P (15.6 μg/mL) was lower than Chitosan-P (31.2 μg/mL) and EGCG (500 μg/mL) against Pseudomonas fluorescens (p < 0.05). Additionally, EGCG-g-chitosan-P and Chitosan-P presented higher Staphylococcus aureus growth inhibition (100%) than EGCG at the lowest concentration tested. The nanoparticles produced an increase of ROS (p < 0.05) in both bacterial species assayed. Furthermore, EGCG-g-chitosan-P exhibited higher antioxidant activity than that of Chitosan-P (p < 0.05) in 2,2′-azino-bis (3-ethyl-benzothiazoline-6-sulfonic acid) (ABTS), 2,2-diphenyl-1-picrylhydrazyl radical (DPPH) and ferric-reducing antioxidant power assays. Based on the above results, EGCG-g-chitosan-P shows the potential for food packaging and biomedical applications.

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