نتایج جستجو برای: hydrogel beads

تعداد نتایج: 25204  

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2009
saeed mohammad beigi aziz babapoor vida maghsoodi sayyed mohammad mousavi narges rajabi

in this study chitosan hydrogel beads with porosity ~ 0.86 and diameter ~ 20.07 mm were prepared from 85 % deacetylated chitosan for removal of cd2+ ions from aqueous solutions.  chitosan powder was dissolved into dilute acetic acid as solvent and formed into spherical beads using a phase inversion technique. the effect of temperature, initial concentration of cd2+ ions, and the period of agita...

2018
Poonam Trivedi Tiina Saloranta-Simell Uroš Maver Lidija Gradišnik Neeraj Prabhakar Jan-Henrik Smått Tamilselvan Mohan Martin Gericke Thomas Heinze Pedro Fardim

Cytocompatible polysaccharide-based functional scaffolds are potential extracellular matrix candidates for soft and hard tissue engineering. This paper describes a facile approach to design cytocompatible, non-toxic, and multifunctional chitosan-cellulose based hydrogel beads utilising polysaccharide dissolution in sodium hydroxide-urea-water solvent system and coagulation under three different...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2014
Valerie Fleischauer Jinseok Heo

This paper describes a whole cell sensor using E. coli entrapped within photocrosslinked hydrogel beads. Hydrogel beads containing organophosphorus hydrolase (OPH)-expressed E. coli were prepared by adding a hydrogel precursor solution containing the E. coli to an oil phase using a precision syringe pump, forming droplets, and photopolymerizing them. The beads showed good monodispersity with an...

2013
T. K. Giri C. Choudhary A. Alexander Ajazuddin H. Badwaik M. Tripathy D. K. Tripathi

Interpenetrating polymer network hydrogel beads of pectin and sodium carboxymethyl xanthan were prepared by ionotropic gelation with Al(+3) ions and covalent cross-linking with glutaraldehyde for sustained delivery of diltiazem hydrochloride. Fourier transform infrared spectroscopy, X-ray diffraction, differential scanning colorimetry and scanning electron microscopy were used to characterise t...

Journal: :Tissue engineering. Part C, Methods 2010
Mimi W Zhang Hansoo Park Xuan Guo Kenta Nakamura Robert M Raphael F Kurtis Kasper Antonios G Mikos Panagiotis A Tsonis

This study investigated the encapsulation of newt iris pigment epithelial cells (PECs), which have the ability to regenerate a lens by trans-differentiation in vivo, within a biodegradable hydrogel of oligo(poly(ethylene glycol) fumarate) crosslinked with poly(ethylene glycol)-diacrylate. Hydrogel beads of initial diameter of 1 mm were fabricated by a molding technique. The swelling ratio and d...

2004
Nan Li

In this study, we examined the properties of chitosan-cellulose hydrogel beads as an adsorbent and its application for lead ion adsorption. Chitosan was blended with cellulose to improve the mechanical strength of chitosan hydrogel beads and the chitosan-cellulose hydrogel beads were cross-linked with ethylene glycol diglycidyl ether (EGDE) to enhance their acid-resistant ability. Scanning elec...

2018
Sarath Chandra Veerla Da Reum Kim Sung Yun Yang

Background Controlled drug delivery system is highly important for not only prolonged the efficacy of drug but also cellular development for tissue engineering. A number of biopolymer composites and nanostructured carriers behave been used for the controlled drug delivery of therapeutics. Recently, in vitro microfluidic devices that mimic the human body have been developed for drug-delivery app...

Journal: :Biopolymers 1999
M Esch V L Sukhorukov M Kürschner U Zimmermann

The electrical and dielectric properties of Ba2+ and Ca2+ cross-linked alginate hydrogel beads were studied by means of single-particle electrorotation. The use of microstructured electrodes allowed the measurements to be performed over a wide range of medium conductivity from about 5 mS/m to 1 S/m. Within a conductivity range, the beads exhibited measurable electrorotation response at frequenc...

Journal: :International journal of pharmaceutics 2002
Hua Zhang Ibrahim A Alsarra Steven H Neau

A multiparticulate system of chitosan hydrogel beads has been investigated for colon-specific delivery of macromolecules using fluorescein isothiocyanate-labeled bovine serum albumin as a model protein. The hydrogel bead was formed by polyelectrolyte complexation of chitosan with its counterion, tripolyphosphate (TPP). The protein release experiments were carried out in vitro under different co...

2012
Haifeng Yang Xuan Qiao Wei Hong

Core–shell microcapsules capable of regulating the release profile of encapsulated molecules are developed. These microcapsules uniquely embed miniature actuators in their liquid core. The internal actuators are made of stimuli-responsive smart hydrogel beads. The embedded hydrogel beads swell in response to external electric fields, regulating the internal pressure of the liquid core and thus ...

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