Physical Characteristics of Poly(vinyl alcohol) and Calcium Alginate Hydrogels for the Immobilization of Activated Sludge

2001 ◽  
Vol 2 (2) ◽  
pp. 568-574 ◽  
Author(s):  
M. C. Doria-Serrano ◽  
F. A. Ruiz-Treviño ◽  
C. Rios-Arciga ◽  
M. Hernández-Esparza ◽  
P. Santiago
Keyword(s):  
Activated Sludge ◽  
Vinyl Alcohol ◽  
Calcium Alginate ◽  
Physical Characteristics ◽  
Poly Vinyl Alcohol ◽  
Alginate Hydrogels

Papain wound dressings obtained from poly(vinyl alcohol)/calcium alginate blends as new pharmaceutical dosage form: Preparation and preliminary evaluation

2017 ◽  
Vol 113 ◽  
pp. 11-23 ◽  
Author(s):  
J.A.P. Dutra ◽  
S.G. Carvalho ◽  
A.C.D. Zampirolli ◽  
R.D. Daltoé ◽  
R.M. Teixeira ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Calcium Alginate ◽  
Dosage Form ◽  
Wound Dressings ◽  
Poly Vinyl Alcohol ◽  
Preliminary Evaluation ◽  
Pharmaceutical Dosage Form

Synthesis of spherical porous cross-linked glutaraldehyde/poly(vinyl alcohol) hydrogels

2016 ◽  
Vol 36 (9) ◽  
pp. 891-898
Author(s):  
Sadao Araki ◽  
Yuko Shirakura ◽  
Harufumi Suzuki ◽  
Hideki Yamamoto
Keyword(s):  
Sodium Alginate ◽  
Vinyl Alcohol ◽  
Calcium Alginate ◽  
Chloride Solution ◽  
Calcium Chloride Solution ◽  
Inorganic Salts ◽  
Poly Vinyl Alcohol ◽  
Cross Linking ◽  
Alginate Content ◽  
Calcium Alginate Gels

Abstract Spherical glutaraldehyde cross-linked poly(vinyl alcohol) (PVA) hydrogels (G-PVA) were prepared in three steps: gelatification, cross-linking, and removal of alginate. Gelatification was carried out by dropping a solution of alginate, PVA, and glutaraldehyde into a calcium chloride solution to form calcium alginate. Calcium alginate gels were prepared at 20°C, 40°C, 60°C, and 80°C to study the effect of gelatification temperature on the formation of pores on the surface of G-PVA. The effect of the alginate content was studied. PVA and glutaraldehyde were cross-linked by immersion of the gels in a solution of H2SO4 and Na2SO4. The effect of sodium alginate and inorganic salts, such as MgSO4 and K2SO4, on the formation of pores on the surface of G-PVA was confirmed.

Entrapment of ethyl vanillin in calcium alginate and calcium alginate/poly(vinyl alcohol) beads

2013 ◽  
Vol 67 (2) ◽  
Author(s):  
Steva Levic ◽  
Verica Djordjevic ◽  
Nevenka Rajic ◽  
Milan Milivojevic ◽  
Branko Bugarski ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Calcium Alginate ◽  
Poly Vinyl Alcohol ◽  
Gel Formation ◽  
Ftir Analysis ◽  
Ethyl Vanillin ◽  
Freeze Thaw ◽  
Thermal Gravimetry ◽  
The Matrix ◽  
Cross Linker

AbstractElectrostatic extrusion was applied to the encapsulation of 3-ethoxy-4-hydroxybenzaldehyde (ethyl vanillin) in calcium alginate and calcium alginate/poly(vinyl alcohol) beads. The calcium alginate/poly(vinyl alcohol) hydrogel spheres were formed after contact with the cross-linker solution of calcium chloride, followed by the freeze-thaw method for poly(vinyl alcohol) gel formation. The entrapment of aroma in beads was investigated by FTIR and thermal analysis (thermogravimetry/differential thermal gravimetry; TGA/DTG). The mass loss in the temperature range of 150–300°C is related to degradation of the matrix and the release of ethyl vanillin. According to the DTG curve, the release of ethyl vanillin occurs at about 260°C. TGA measurements of the stored samples confirmed that formulations were stable for a period of one month. FTIR analysis provides no evidence for chemical interactions between flavour and alginate that would alter the nature of the functional groups in the flavour compound.

scholarly journals Use of Poly(vinyl alcohol)-Malic Acid (CLHPMA) Hydrogels and Chitosan Coated Calcium Alginate (CCCA) Microparticles as Potential Sorbent Phases for the Extraction and Quantitative Determination of Pesticides from Aqueous Solutions

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3993
Author(s):  
Cristian Valdés ◽  
Oscar Valdés ◽  
Daniel Bustos ◽  
Diana Abril ◽  
Gustavo Cabrera-Barjas ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Malic Acid ◽  
Vinyl Alcohol ◽  
Calcium Alginate ◽  
Crop Yields ◽  
Poly Vinyl Alcohol ◽  
Mechanical Agitation ◽  
Experimental Conditions ◽  
Desorption Process

Pesticides are used worldwide to increase crop yields in agriculture. However, their toxicity and accumulation capacity can make them toxic to the environment, animals and humans. In the case of workers chronically exposed to these substances, they must be sampled continuously, so urine is an excellent option. In this sense, this study proposes to use poly(vinyl alcohol)-malic acid hydrogels, and chitosan-coated calcium alginate as new sorbent phases to be used in pesticide determination processes in urine. To better understand the behavior of these materials in the capture and desorption process, molecular dynamics simulations (MDS) were used, and desorption experiments were performed, using mechanical agitation, ultrasound, and pH variation in the desorption process, in order to optimize the parameters to obtain better recoveries. Under the optimal experimental conditions, the maximum recoveries were of the order of 11% (CFN), 3% (KCF), 53% (DMT), 18% (MTD) and 35% (MTL). Although the recoveries were not exhaustive, they are a first approximation for the use of these new sorbent phases in the determination of this type of compound in aqueous solutions and urine.

Physical characteristics of poly (vinyl alcohol) solutions in relation to electrospun nanofiber formation

2013 ◽  
Vol 49 (2) ◽  
pp. 290-298 ◽  
Author(s):  
Romana Rošic ◽  
Jan Pelipenko ◽  
Julijana Kristl ◽  
Petra Kocbek ◽  
Marija Bešter-Rogač ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Physical Characteristics ◽  
Poly Vinyl Alcohol ◽  
Electrospun Nanofiber

Investigating SMART Membranes and Coatings by In Situ Synthesis of Iron Oxide Nanoparticles in PVA Hydrogels

2008 ◽  
Vol 60 ◽  
pp. 32-37 ◽  
Author(s):  
George K. Stylios ◽  
Tao Yu Wan
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Vinyl Alcohol ◽  
Calcium Alginate ◽  
Poly Vinyl Alcohol ◽  
Oxide Nanoparticles ◽  
Particle Nucleation ◽  
Iron Oxide Particles

This paper reports a novel method of developing SMART nanocomposite membranes and coatings by in situ synthesis of iron oxide particles in a Poly(vinyl alcohol) (PVA)matrix, using co-precipitation of different amounts of Fe(II) and Fe(III) taken in an alkaline medium. Poly(vinyl alcohol) was used to encapsulate iron oxide nanoparticles, as scaffold for particle nucleation and its influence on particle size and on magnetic properties were studied. The ferrogels were prepared by a freeze/thawing process of the solutions containing magnetite nanoparticles. Magnetite particles with an average diameter of 20-40 nm were obtained homogeneously within the matrix because of the tridimensional structure and chelating capacities of PVA. Calcium-alginate PVA gel was used to encapsulate the iron oxide/PVA nanocomposite. The mechanical properties and the saturation magnetization of the system were measured. The combination of magnetic properties of iron nanoparticles with the biocompatibility of calcium-alginate suggests that these materials have great potential for use as controlled delivery systems activated externally by magnetic stimuli.

Nitrogen removal and microbial diversity of activated sludge entrapped in modified poly(vinyl alcohol)–sodium alginate gel

2017 ◽  
Vol 125 ◽  
pp. 243-250 ◽  
Author(s):  
Xiaoyi Xu ◽  
Chenpei Lv ◽  
Xiaolu You ◽  
Bin Wang ◽  
Fangying Ji ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Microbial Diversity ◽  
Sodium Alginate ◽  
Nitrogen Removal ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Alginate Gel

Antibiotic drug release behavior of poly (vinyl alcohol)/sodium alginate hydrogels

2020 ◽  
Vol 51 (7) ◽  
pp. 850-855
Author(s):  
L. Xie ◽  
H. Wei ◽  
L. Kou ◽  
L. Ren ◽  
J. Zhou
Keyword(s):  
Drug Release ◽  
Sodium Alginate ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Release Behavior ◽  
Drug Release Behavior ◽  
Antibiotic Drug ◽  
Alginate Hydrogels

Production of ethanol from molasses at 45 °C using Kluyveromyces marxianus IMB3 immobilized in calcium alginate gels and poly(vinyl alcohol) cryogel

1998 ◽  
Vol 19 (2) ◽  
pp. 87-90 ◽  
Author(s):  
S. Gough ◽  
N. Barron ◽  
A. L. Zubov ◽  
V. I. Lozinsky ◽  
A. P. McHale
Keyword(s):  
Kluyveromyces Marxianus ◽  
Vinyl Alcohol ◽  
Calcium Alginate ◽  
Poly Vinyl Alcohol ◽  
Alginate Gels ◽  
Calcium Alginate Gels
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