Enhanced mechanical stability and sensitive swelling performance of chitosan/yeast hybrid hydrogel beads

2016 ◽  
Vol 40 (4) ◽  
pp. 3350-3362 ◽  
Author(s):  
Diejing Feng ◽  
Bo Bai ◽  
Honglun Wang ◽  
Yourui Suo
Keyword(s):  
Mechanical Stability ◽  
Hybrid Hydrogel ◽  
Hydrogel Beads ◽  
Chitosan Hydrogels ◽  
Yeast Hybrid

Up to the present time, improving the mechanical stability of hydrogel beads is still a challenging task for future applications of chitosan hydrogels.

scholarly journals Isolation of Circulating Biomarkers for Liquid Biopsy using Immunoaffinity‐Based Stimuli‐Responsive Hybrid Hydrogel Beads

2021 ◽  
Author(s):  
Yoon-Tae Kang ◽  
Young Jun Kim ◽  
Brittany Rupp ◽  
Emma Purcell ◽  
Thomas Hadlock ◽  
...  
Keyword(s):  
Liquid Biopsy ◽  
Stimuli Responsive ◽  
Circulating Biomarkers ◽  
Hybrid Hydrogel ◽  
Hydrogel Beads

scholarly journals Nanoporous Sodium Carboxymethyl Cellulose-g-poly (Sodium Acrylate)/FeCl3 Hydrogel Beads: Synthesis and Characterization

Gels ◽  
2020 ◽  
Vol 6 (4) ◽  
pp. 49
Author(s):  
Bijender Kumar ◽  
Ruchir Priyadarshi ◽  
Sauraj ◽  
Farha Deeba ◽  
Anurag Kulshreshtha ◽  
...  
Keyword(s):  
Carboxymethyl Cellulose ◽  
Sodium Carboxymethyl Cellulose ◽  
Sodium Acrylate ◽  
X Ray Diffraction ◽  
Hybrid Hydrogel ◽  
X Ray ◽  
Hydrogel Beads ◽  
Force Microscopy ◽  
Atomic Force ◽  
Potential Applications

Novel sodium carboxymethyl cellulose-g-poly (sodium acrylate)/Ferric chloride (CMC-g-PNaA/FeCl3) nanoporous hydrogel beads were prepared based on the ionic cross-linking between CMC-g-PNaA and FeCl3. The structure of CMC and CMC-g-PNaA were elucidated by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) spectroscopy, and the elemental composition was analyzed by energy dispersive X-ray analysis (EDX). The physicochemical properties of the CMC-g-PNaA/FeCl3 hydrogel beads were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and thermogravimetric analysis (TGA). The swelling percentage of hydrogel beads was studied at different time periods. The obtained CMC-g-PNaA/FeCl3 hydrogel beads exhibited a higher nanoporous morphology than those of CMC-g-PNaA and CMC beads. Furthermore, an AFM image of the CMC-g-PNaA/FeCl3 beads shows granule type topology. Compared to the CMC-g-PNaA (189 °C), CMC-g-PNaA/FeCl3 hydrogel beads exhibited improvement in thermal stability (199 °C). Furthermore, CMC-g-PNaA/FeCl3 hydrogel beads depicted a higher swelling percentage capacity of around 1452%, as compared to CMC-g-PNaA (1096%). Moreover, this strategy with preliminary results could be useful for the development of polysaccharide-based hybrid hydrogel beads for various potential applications.

scholarly journals Survival and Behavior of Encapsulated Probiotics (Lactobacillus plantarum) in Calcium-Alginate-Soy Protein Isolate-Based Hydrogel Beads in Different Processing Conditions (pH and Temperature) and in Pasteurized Mango Juice

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Ong-Ard Praepanitchai ◽  
Athapol Noomhorm ◽  
Anil Kumar Anal
Keyword(s):  
Lactobacillus Plantarum ◽  
Soy Protein ◽  
Soy Protein Isolate ◽  
Protein Isolate ◽  
Heat Processing ◽  
Hybrid Hydrogel ◽  
Hydrogel Beads ◽  
Acidic Conditions ◽  
Mango Juice ◽  
And Behavior

Hybrid alginate-soy protein isolate-based hydrogel beads were prepared and evaluated to enhance the survival of the encapsulated probiotics (Lactobacillus plantarum) during heat processing to incorporate in mango juice. The solutions of sodium alginate-soy protein isolate (SA-SPI) with probiotic cells were dropped into the gelation bath containing calcium chloride (3% w/v) solution to develop various types of hydrogel beads. The level of survival of probiotics in encapsulated beads under acidic conditions (pH 2, 3, and 6.5) and bile salt (0.5 and 1.0% w/v) was evaluated. The survival of the encapsulated probiotics to thermal processing was evaluated by treating the beads in saline solution (0.9% w/v) at 30, 50, 63, and 72°C. The encapsulated probiotic bacteria were found alive even after treatment at 72°C for 90 s. Most of the free cells did not survive at the temperature higher than 50°C and very low pH (pH 2 and 3). The survival of probiotic cells was found higher with the hybrid hydrogel beads containing alginate and soy protein isolate (1:8 w/w). Furthermore, mango juice fortified with encapsulated L. plantarum in hydrogel beads was subjected to thermal pasteurization at 72°C for 90 s.

scholarly journals Membran Blend Kitosan/Poli Vinil Alkohol (PVA): Pengaruh Komposisi material blend, pH, dan Konsentrasi bahan Pengikat Silang

2017 ◽  
Vol 2 (2) ◽  
pp. 77
Author(s):  
Bambang Piluharto ◽  
A Sjaifullah ◽  
I Rahmawati ◽  
Erix Nurharianto
Keyword(s):  
Oxalic Acid ◽  
Mechanical Stability ◽  
Crosslinking Agent ◽  
Chitosan Concentration ◽  
Crosslinking Process ◽  
Degree Of Swelling ◽  
Ph Buffer ◽  
Chitosan Hydrogels ◽  
Two Stages ◽  
Crosslinking Agents

AbstrakMembran blend biodegradabel dengan kestabilan termal dan mekanik yang berasal dari gabungan kitosan dan PVA telah dihasilkan melalui dua tahapan. Pada tahap pertama dilakukan proses pelarutan kitosan dan poli vinil alkohol dan selanjutnya pencampuran kitosan/PVA dan asam oksalat sebagai agen pengikat silang. Asam asetat dan air dipilih sebagai pelarut untuk kitosan dan PVA. Beberapa variasi dalam proses seperti perbandingan konsentrasi kitosan:PVA, konsentrasi agen pengikat silang dan pH buffer, dijadikan sebagai parameter pada penelitian ini. Kerapatan hidrogel dan kuat tarik mengalami kenaikan seiring dengan peningkatan konsentrasi agen pengikat silang dan PVA dengan konsentrasi kitosan paling rendah. Namun derajat swelling memiliki trend yang berbeda dimana naiknya derajat swelling diperoleh seiring dengan peningkatan konsentrasi kitosan dengan kondisi konsentrasi agen pengikat silang dan PVA paling rendah. Keberhasilan proses blending  dan ikat silang ditunjukkan dari hasil spektra infra merah dimana analisa spektrum infra merah dari hidrogel kitosan murni dan hidrogel kitosan/PVA menunjukkan kenaikan intensitas serapan pada daerah amida (1600 cm-1 sampai 1670 cm-1), hal ini menguatkan dugaan terbentuknya ikatan silang antara asam oksalat sebagai crosslinker dengan kitosan. Kata kunci: membran blend, kitosan/PVA, asam oksalat, pengikat silang. AbstractBiodegradable blend membranes with thermal and mechanical stability based on combination of chitosan and PVA have been produced through two stages. In the first stage, chitosan and PVA are dissolved and further mixing chitosan/polyvinyl alcohol with oxalic acid as crosslinking agents. Acetic acid and water are selected as solvents for chitosan and PVA. Some variations in the process such as comparison of chitosan:PVA concentration, concentration of crosslinking agent and pH of buffer, are used as parameters in this study. The hydrogel density and tensile strength increased with increasing concentration of crosslinking agent and PVA with the lowest concentration of chitosan. However, the degree of swelling has a distinct trend in which the increase of degree of swelling is obtained along with the increase of chitosan concentration with the lowest concentration of crosslinking agent and PVA. The success of the blending and crosslinking process is shown by the results of infrared spectra where infrared spectrum analyzes from purified chitosan hydrogels and chitosan/chloride hydrogels show an increase in absorption intensity in the amide area (1600 cm-1 to 1670 cm-1), this reinforces the alleged crosslinking formation between oxalic acid as crosslinker and chitosan. Keywords: blend membrane, chitosan: PVA, crosslinker.

scholarly journals Self‐Assembling Supramolecular Hybrid Hydrogel Beads

2020 ◽  
Vol 59 (2) ◽  
pp. 853-859 ◽  
Author(s):  
Carmen C. Piras ◽  
Petr Slavik ◽  
David K. Smith
Keyword(s):  
Hybrid Hydrogel ◽  
Hydrogel Beads ◽  
Self Assembling

scholarly journals The equilibrium and fixed-bed study of malachite green adsorption on chitosan hydrogels

2019 ◽  
Vol 79 (8) ◽  
pp. 1571-1579 ◽  
Author(s):  
X. H. Song ◽  
K. L. Goh ◽  
K. Wang
Keyword(s):  
Malachite Green ◽  
Adsorption Equilibrium ◽  
Ph Value ◽  
Fixed Bed ◽  
Precipitation Process ◽  
Chitosan Hydrogel ◽  
Hydrogel Beads ◽  
Conventional Models ◽  
Chitosan Hydrogels ◽  
Transfer Mechanisms

Abstract Chitosan hydrogel beads were prepared by a precipitation process, and were used to investigate the adsorption of malachite green (MG) oxalate under various conditions. It was found that adsorption equilibrium was most sensitive to the pH value at pH <8 while fixed bed breakthrough kinetics presented asymmetric S-shaped profiles which could not be adequately described by conventional models such as Adams-Bohart and Yoon-Nelson. The possible reasons were discussed and an improved Adams-Bohart model was proposed to better describe the changes in mass transfer mechanisms during adsorption.

scholarly journals Self‐Assembling Supramolecular Hybrid Hydrogel Beads

2019 ◽  
Vol 132 (2) ◽  
pp. 863-869 ◽  
Author(s):  
Carmen C. Piras ◽  
Petr Slavik ◽  
David K. Smith
Keyword(s):  
Hybrid Hydrogel ◽  
Hydrogel Beads ◽  
Self Assembling
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