Membranes based on poly(vinyl alcohol)/β-cyclodextrin blends

Paduraru, Oana-Maria; Vasile, Cornelia; Paţachia, Silvia; Grigoraş, Cristian; Oprea, Ana-Maria

doi:10.14314/polimery.2010.473

Cited by 14 publications

(6 citation statements)

References 28 publications

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“…Fluorescence spectroscopy analysis of the aqueous PVA solutions, with different amounts of b-cyclodextrin in composition (5,10,15,25, and 30% reported to the polymer) has revealed that BCD is able to determine the steric rearrangement of the -OH groups from the PVA macromolecule (Table I).…”

Section: Resultsmentioning

confidence: 99%

“…Several materials that possess good affinity for β‐cyclodextrin, such as silica gel or poly(vinyl alcohol) could not be used as such for the selective adsorption of BCD from complex mixtures, because their low selectivity when in contact with structurally related compounds.…”

Section: Introductionmentioning

confidence: 99%

“…This solvent extraction procedure leads to an increased overall price of the final product and trace impurification by solvent adsorption inside the cyclodextrin cavity. 4 Several materials that possess good affinity for b-cyclodextrin, such as silica gel or poly(vinyl alcohol) 5 could not be used as such for the selective adsorption of BCD from complex mixtures, because their low selectivity when in contact with structurally related compounds.…”

Section: Introductionmentioning

confidence: 99%

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Increasing the adsorption capacity and selectivity of poly(vinyl alcohol) hydrogels by an alternative imprinting technique

Paţachia

Croitoru

2015

J of Applied Polymer Sci

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In this work, we report an innovative alternative imprinting method for obtaining chemically crosslinked poly(vinyl alcohol) hydrogels with b-cyclodextrin as template. The materials present high affinity toward the template that imprinted them, revealed by the higher sorption yield of b-cyclodextrin and higher selectivity factors of the imprinted material, by comparing with the nonimprinted reference. The imprinting kinetic and mechanism has been demonstrated by adsorption studies, binding isotherms and Scatchard analysis and is in good correlation with the information regarding the morphology of the materials, determined by fluorescence microscopy and atomic force microscopy. By using a novel fluorescence spectroscopy method of the starting polymer solution, the optimum amount of imprinting template could be determined.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Increasing the adsorption capacity and selectivity of poly(vinyl alcohol) hydrogels by an alternative imprinting technique

Paţachia

Croitoru

2015

J of Applied Polymer Sci

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“…Poly(vinyl alcohol) (PVA) is a well-known hydrophilic water-soluble polymer used in drug delivery systems. Several techniques can be applied to form PVA hydrogels in aqueous solutions, such as photo-cross linking [ 9 ], freezing-thawing [ 10 ], irradiation [ 11 , 12 ], polymer blending [ 13 , 14 ], and chemical cross-linking [ 15 , 16 ]. PVA is a good candidate for polymer blending due to its high polarity, aqueous solubility, and biodegradable properties.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Evaluation of Ternary Complexes of Ascorbic Acid with γ-Cyclodextrin and Poly(vinyl Alcohol)

Saokham

Burapapadh

Praphanwittaya

et al. 2020

IJMS

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Ascorbic acid (AA) is a general antioxidant used in aqueous pharmaceutical formulations. However, in aqueous solutions, AA is unstable and easily oxidized when exposed to air, light and/or heat. Cyclodextrins are well known for their ability to form inclusion complexes with various compounds to improve their solubility and stability. Previous studies demonstrate that cyclodextrins preserve the antioxidant capacity of AA but data for γ-cyclodextrin (γCD) have not been reported. Poly(vinyl alcohol) (PVA) is a hydrophilic polymer widely used as a drug matrix in various pharmaceutical fields, but its application for drug stabilization is limited. This study aimed to investigate the protective ability of γCD on AA through the formation of ternary complexes with PVA. Binary (i.e., AA/γCD, AA/PVA and γCD/PVA) and ternary (i.e., AA/γCD/PVA) complexes were first confirmed. It was reported that those complexes were formed through interactions between the heterocyclic ring of AA, hydroxyl group of PVA and hydrophobic cavity of γCD. The hydrodynamic diameter of complexes was then studied. It was found that the diameter of γCD/PVA complexes increased with respect to the concentration of γCD. Higher γCD concentrations also resulted in increasing hydrodynamic diameters of the ternary complex. The presence of AA in ternary complexes interfered with the aggregation tendency of γCD/PVA binary complexes. Furthermore, the antioxidant capacity of AA in binary and ternary complexes was investigated. It was found that the presence of γCD preserved the antioxidant activity of AA, whereas PVA showed a contrasting effect. The influence of γCD and PVA concentration on antioxidant capacity was then studied through central composite design (CCD). Even though the concentration of γCD significantly affected the inhibition efficiency of the ternary complex, the insignificant influence of PVA could not be ignored. A promising protective ternary complex should consist of an optimized concentration of PVA and a high concentration of γCD.

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“…Nowadays, due to the environmental policy constraints, researchers are looking for ecological substrates for dyes sorption from aqueous solutions . In these conditions, due to its properties (water solubility, non‐toxicity, non‐carcinogenity, biodegradability, biocompatibility, capacity to form gels by cryogenic techniques), poly(vinyl alcohol) (PVA) is a proper candidate who has the capacity to be blend with other polymers or to be matrix for different fillers allowing obtaining of new materials with controlled properties . Due to the ease of obtaining, to their special sorption and transport properties, the PVA cryogels were studied in different contexts both for retention of metal ions, dyes, or ionic liquids .…”

Section: Introductionmentioning

confidence: 99%

Crystal violet dye sorption and transport in/through biobased PVA cryogel membranes

Papancea

Paţachia

Dobritoiu

2015

J of Applied Polymer Sci

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Cryogels based on poly(vinyl alcohol) [PVA] and three types of bioinsertions such as scleroglucan, cellulose microfibers, and zein, respectively, have been prepared using capacity of PVA to crosslink by repeated freezing-thawing cycles. The effect of the incorporation of biopolymers on the properties of PVA cryogel has been studied by using several techniques such as: scanning electron microscopy, differential scanning calorimetry, and Fourier transform infrared studies. The obtained biobased cryogel membranes were subjected to sorption and to diffusion experiments using Crystal Violet (CV), a dye commonly used in the textile industry and in medicine. Image analysis with CIELAB system was used both to monitor the cryogels loading with CV and to gain insight in the dye state into the gel, in correlation with the bioinsertion type and gels morphology. Dye diffusion but also sorption capacity of the cryogels was found to be closely related to the type of biopolymer. In this article the equilibrium (sorption isotherms) and transport properties (diffusion and permeability coefficients) of CV, in/through physical cross-linked PVA hydrogel membranes with bioinsertions has been reported. The highest efficiency for the CV removal from aqueous solutions was obtained for the PVA/Scl cryogels.

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Membranes based on poly(vinyl alcohol)/β-cyclodextrin blends

Cited by 14 publications

References 28 publications

Increasing the adsorption capacity and selectivity of poly(vinyl alcohol) hydrogels by an alternative imprinting technique

Increasing the adsorption capacity and selectivity of poly(vinyl alcohol) hydrogels by an alternative imprinting technique

Characterization and Evaluation of Ternary Complexes of Ascorbic Acid with γ-Cyclodextrin and Poly(vinyl Alcohol)

Crystal violet dye sorption and transport in/through biobased PVA cryogel membranes

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