Application of weakly basic copolymer polyacrylamide (acrylamide-CO-N,N′-dimethylaminoethyl methacrylate) gels in the recovery of citric acid

González-Sáiz, J.M.; Fernández-Torroba, M. A.; Pizarro, Consuelo

doi:10.1016/s0014-3057(96)00191-7

Cited by 18 publications

(4 citation statements)

References 28 publications

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“…However, it should be noticed that the SR begins to increase and reach a second peak at pH = 7 as pH continues to increase. This phenomenon has also been reported by another group, and may be because the ester group of PDMAEMA is partially hydrolyzed into carboxylic acid during the swelling process. Some of the carboxylic acid groups are further ionized to contribute to higher SR. P(OVPS 4 ‐ co ‐DMAEMA) exhibits especially strong pH sensitivity among all the hybrid hydrogels, and Table shows that the ratio between the SRs at pH = 2 and pH = 10 is as high as 17.86.…”

Section: Resultssupporting

confidence: 82%

A novel temperature and pH dual‐responsive hybrid hydrogel with polyhedral oligomeric silsesquioxane as crosslinker: synthesis, characterization and drug release properties

Zhang

et al. 2014

Polymer International

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Section: Resultssupporting

confidence: 82%

A novel temperature and pH dual‐responsive hybrid hydrogel with polyhedral oligomeric silsesquioxane as crosslinker: synthesis, characterization and drug release properties

Zhang

et al. 2014

Polymer International

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“…Molecular imprinting using hydrogels (HydroMIPs) have been well documented, with a vast array of monomers currently being used for molecular imprinting [2]. Monomers that have commonly been used for noncovalent molecular imprinted hydrogels are generally chosen on their ability to form weak hydrogen bonds between the monomer and the template [1,3,4]. Acrylamide-based hydrogels are known to be very inert, offer hydrogen bonding capabilities, and are biocompatible [5].…”

Section: Introductionmentioning

confidence: 99%

Enhanced selectivity of hydrogel-based molecularly imprinted polymers (HydroMIPs) following buffer conditioning

EL-Sharif¹,

Phan²,

Reddy³

2014

Analytica Chimica Acta

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We have investigated the effect of buffer solution composition and pH during the preparation, washing and re-loading phases within a family of acrylamide-based molecularly imprinted polymers (MIPs) for bovine haemoglobin (BHb), equine myoglobin (EMb) and bovine catalyse (BCat). We investigated water, phosphate buffer saline (PBS), tris(hydroxymethyl)aminomethane (Tris) buffer and succinate buffer. Throughout the study MIP selectivity was highest for acrylamide, followed by N-hydroxymethylacrylamide, and then N-iso-propylacrylamide MIPs. The selectivity of the MIPs when compared with the NIPs decreased depending on the buffer conditions and pH in the order of Tris>PBS>succinate. The Tris buffer provided optimum imprinting conditions at 50 mM and pH 7.4, and MIP selectivities for the imprinting of BHb in polyacrylamide increased from an initial 8:1 to a 128:1 ratio. It was noted that the buffer conditions for the re-loading stage was important for determining MIP selectivity and the buffer conditions for the preparation stage was found to be less critical. We demonstrated that once MIPs are conditioned using Tris or PBS buffers (pH7.4) protein reloading in water should be avoided as negative effects on the MIP's imprinting capability results in low selectivities of 0.8:1. Furthermore, acidifying the pH of the buffer solution below pH 5.9 also has a negative impact on MIP selectivity especially for proteins with high isoelectric points. These buffer conditioning effects have also been successfully demonstrated in terms of MIP efficiency in real biological samples, namely plasma and serum.

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“…Gündüz and Tolga have studied bovine serum albumin sorption and recovery by hydrogels . Gonzalez-Saiz et al have investigated removal of citric acid using weakly basic copolymer polyacrylamide (acrylamide-co- n , n' -dimethylaminoethyl methacrylate) gels . However, there are not adequate data in the literature about the removal of carboxylic acids from aqueous solutions by hydrogels.…”

Section: Introductionmentioning

confidence: 99%

Removal of Some Carboxylic Acids from Aqueous Solutions by Hydrogels

Aşçı

Hasdemir

2008

J. Chem. Eng. Data

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Carboxylic acids are biotechnological substances that are used extensively in many industries, thus production and separation of carboxylic acids from product mixtures are important scientific and economic problems. The aim of this work was to investigate the removal of acetic, citric, lactic, and tartaric acids from aqueous solutions. With this aim, first the effects of time, temperature, and mixing on separation of the carboxylic acids from aqueous solutions were investigated by experimental work. After the experimental conditions were determined, separation was undertaken for different initial acid concentrations at constant hydrogel concentration. The effect of different gel−acid mass ratios on adsorption at constant initial acid concentrations was determined. The removal of acetic acid was 59.74 %, of lactic acid was 55.45 %, of citric acid was 54.22 %, and of tartaric acid was 56.85 % with a 1.5 hydrogel/acid mass ratio at the lowest concentration of each acid. Results obtained from the experimental work have been used with the Freundlich isotherm.

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Application of weakly basic copolymer polyacrylamide (acrylamide-CO-N,N′-dimethylaminoethyl methacrylate) gels in the recovery of citric acid

Cited by 18 publications

References 28 publications

A novel temperature and pH dual‐responsive hybrid hydrogel with polyhedral oligomeric silsesquioxane as crosslinker: synthesis, characterization and drug release properties

A novel temperature and pH dual‐responsive hybrid hydrogel with polyhedral oligomeric silsesquioxane as crosslinker: synthesis, characterization and drug release properties

Enhanced selectivity of hydrogel-based molecularly imprinted polymers (HydroMIPs) following buffer conditioning

Removal of Some Carboxylic Acids from Aqueous Solutions by Hydrogels

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