Comparative study on polyvinyl alcohol and alginate for cell immobilization in biosorption

2000 ◽  
Vol 42 (5-6) ◽  
pp. 85-90 ◽  
Author(s):  
Y.P. Ting ◽  
G. Sun
Keyword(s):  
Polyvinyl Alcohol ◽  
Calcium Alginate ◽  
Dilute Hydrochloric Acid ◽  
Cell Immobilization ◽  
Chemical Properties ◽  
Yeast Cells ◽  
Lower Mass ◽  
Transfer Resistance ◽  
Alginate Matrix ◽  
And Chemical Properties

In this work, we compared the performance of a new method of cell immobilization in a novel matrix for biosorption. Yeast cells were entrapped in a polyvinyl alcohol (PVA) matrix, based on an adapted iterative freeze-thaw-freeze process. Spherical and uniform beads were produced, and SEM micrographs confirmed that the cells were uniformly dispersed within the PVA matrix. Further experiments revealed that the use of PVA as the immobilization matrix conferred better mechanical and chemical properties than the commonly used calcium alginate matrix. Experiments also showed that the PVA matrix gave rise to a lower mass transfer resistance than the alginate matrix. Finally, it was established that PVA-yeast biosorbent beads could be regenerated using dilute hydrochloric acid (10mM) and reused for at least five biosorption cycles with virtually no decrease in its bisorption capacity. Different metal/biosorbent in PVA-immobilized systems are currently being investigated.

Polyvinyl alcohol as an immobilization matrix - a case of gold biosorption

2001 ◽  
Vol 43 (11) ◽  
pp. 17-23 ◽  
Author(s):  
K.-M. Khoo ◽  
Y.-P. Ting
Keyword(s):  
Polyvinyl Alcohol ◽  
Cell Immobilization ◽  
Chemical Properties ◽  
Isotherm Models ◽  
Transfer Resistance ◽  
Wide Ph Range ◽  
Freundlich Adsorption Isotherm ◽  
Alginate Gels ◽  
Freely Suspended ◽  
Time Required

The use of polyvinyl alcohol (PVA) as a matrix for cell immobilization has been extensively studied in various biological systems. However, its suitability has not been reported in biosorption studies where inactivated cells are used as biosorbents. In this work, PVA and alginate as immobilization matrices (for the biosorption of gold by a fungal biomass) were investigated by examining their physical and chemical properties. Compared to alginate gels, PVA gels were shown to be more resistant to mechanical abrasion, and more stable over a wide pH range. Although the PVA matrix did not affect the equilibrium uptake in gold biosorption studies, the time required to attain a removal of 80% of the initial metal concentration was 1.7 times that of the freely suspended biosorbent. This contrasts with the alginate immobilized biosorbent which required an increase of well over ten times the duration to attain the same removal efficiency. Results indicated that PVA gels conferred a lower mass transfer resistance than alginate gels. Gold biosorption by the PVA-immobilized fungi followed the commonly used Langmuir and Freundlich adsorption isotherm models although the former gave a better fit. The uptake of gold was dependent on the initial gold concentration and the biomass loading. Using a fungal biosorbent and gold ions as the model system, the results demonstrate the potential in the use of the PVA as a cell immobilisation matrix for biosorption studies.

Removal of Cr(VI) from Aqueous Solutions Using PVA/SA Blend Films

2013 ◽  
Vol 781-784 ◽  
pp. 2142-2145
Author(s):  
Wen Juan Fan ◽  
Hong Xiang Ge ◽  
Yu Pang ◽  
Hui Chang
Keyword(s):  
Polyvinyl Alcohol ◽  
Sodium Alginate ◽  
Crosslinking Agent ◽  
Chemical Properties ◽  
Solution Ph ◽  
Hydrogen Bond Interaction ◽  
Blend Films ◽  
Molecular Force ◽  
Physical And Chemical ◽  
And Chemical Properties

The different ratios (PVA and SA) of PVA/SA blend films with cross-linking structure are successfully prepared by coagulating the mixture of sodium alginate (SA) and polyvinyl alcohol (PVA) in aqueous solution, then by treating with crosslinking agent CaCl2solution. The Surface morphology and flexibility of PVA/SA blend films were studied. The results indicate there is some strong interaction and good compatibility between sodium alginate and polyvinyl alcohol molecular. The physical and chemical properties of the PSA-80(PVA:SA=4:1) blend films are obviously improved owing to a molecular force and hydrogen bond interaction. The effects of parameters of the blend film was investigated in relation to its adsorption capability for low concentration ions Cr (VI) including such as SA content of the PVA/SA film, contact time, solution pH and temperature of solution. The results indicate that the maximum adsorption rate is 95.86% at the temperature 50°C under optimized pH 4 for 60min by PSA-80 films.

Immobilization of Lactobacillus rhamnosus in polyvinyl alcohol/calcium alginate matrix for production of lactic acid

2019 ◽  
Vol 43 (2) ◽  
pp. 315-322 ◽  
Author(s):  
Miloš Radosavljević ◽  
Steva Lević ◽  
Miona Belović ◽  
Jelena Pejin ◽  
Aleksandra Djukić-Vuković ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Polyvinyl Alcohol ◽  
Calcium Alginate ◽  
Lactobacillus Rhamnosus ◽  
Alginate Matrix

scholarly journals Hydrophobic Cryogels Based on Polyvinyl Alcohol and Polymeric Oil Resins

2019 ◽  
pp. 166-176
Author(s):  
Maria S. Fufaeva ◽  
Darya V. Fisenko ◽  
Vladimir N. Manzhay ◽  
Vladimir G. Bondaletov ◽  
Lyubov K. Altunina
Keyword(s):  
Polyvinyl Alcohol ◽  
Chemical Properties ◽  
Flow Properties ◽  
Road Pavement ◽  
Binder Component ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle ◽  
Pavement Construction ◽  
Physical And Chemical ◽  
And Chemical Properties

The paper presents the results of studies of the flow properties of viscous compositions consisting of polyvinyl alcohol, polymeric oil resin, and water. After a freeze-thaw cycle three-component cryogels are formed from them. Mechanical, thermal, physical, and chemical properties of the resulted elastic samples are studied. The prospects of using hydrophobic cryogels filled with polymeric oil resin as a binder component for road pavement construction are presented

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

The microstructure of a TiB2/Ti-47 Al composite material

1989 ◽  
Vol 47 ◽  
pp. 674-675
Author(s):  
O. Popoola ◽  
A.H. Heuer ◽  
P. Pirouz
Keyword(s):  
Composite Material ◽  
Ion Beam ◽  
Chemical Properties ◽  
Intermetallic Alloys ◽  
Transmission Electron ◽  
Diamond Polishing ◽  
Al Composite ◽  
The Matrix ◽  
Argon Ion ◽  
And Chemical Properties

The addition of fibres or particles (TiB2, SiC etc.) into TiAl intermetallic alloys could increase their toughness without compromising their good high temperature mechanical and chemical properties. This paper briefly discribes the microstructure developed by a TiAl/TiB2 composite material fabricated with the XD™ process and forged at 960°C.The specimens for transmission electron microscopy (TEM) were prepared in the usual way (i.e. diamond polishing and argon ion beam thinning) and examined on a JEOL 4000EX for microstucture and on a Philips 400T equipped with a SiLi detector for microanalyses.The matrix was predominantly γ (TiAl with L10 structure) and α2(TisAl with DO 19 structure) phases with various morphologies shown in figure 1.

Tailoring microstructures of materials through biomimetics

1993 ◽  
Vol 51 ◽  
pp. 500-501
Author(s):  
Mehmet Sarikaya ◽  
Ilhan A. Aksay
Keyword(s):  
Chemical Properties ◽  
Design And Synthesis ◽  
Structure Sensitive ◽  
Macro Scale ◽  
Methods Of Synthesis ◽  
Successive Level ◽  
Engineering Materials ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Synthesis Of Materials

Biomimetics involves investigation of structure, function, and methods of synthesis of biological composite materials. The goal is to apply this information to the design and synthesis of materials for engineering applications.Properties of engineering materials are structure sensitive through the whole spectrum of dimensions from nanometer to macro scale. The goal in designing and processing of technological materials, therefore, is to control microstructural evolution at each of these dimensions so as to achieve predictable physical and chemical properties. Control at each successive level of dimension, however, is a major challenge as is the retention of integrity between successive levels. Engineering materials are rarely fabricated to achieve more than a few of the desired properties and the synthesis techniques usually involve high temperature or low pressure conditions that are energy inefficient and environmentally damaging.In contrast to human-made materials, organisms synthesize composites whose intricate structures are more controlled at each scale and hierarchical order.

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