Resin Adsorption and Ion Exchange to Recover and Fractionate Polyphenols

Kammerer, Judith; Carle, Reinhold

doi:10.1016/b978-0-12-397934-6.00011-5

Cited by 9 publications

(10 citation statements)

References 33 publications

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“…An indirect confirmation of the polymolecular adsorption of anthocyanins is the identification of dimers and trimers of these substances in ion-exchange membranes [ 110 ] that had a chemical structure similar to the studied resins and put in contact with anthocyanin-containing solutions. Among the reasons for such polymolecular adsorption are the π–π (stacking) interaction of the aromatic rings of polyphenols with each other [ 29 , 50 ] or with substances with the opposite electric charge at a given pH [ 111 ]. We assume that in our case the main reason for polymolecular adsorption is the π–π (stacking) interactions between already adsorbed anthocyanins and those in the pores of the resin or in the external solution.…”

Section: Resultsmentioning

confidence: 99%

“…However, these methods do not always provide the desired degree of purity: the recovery liquid media contains anthocyanins in small quantities and/or as a part of a mixture with many other components. Using sorption methods [ 28 , 29 , 30 ] in combination with membrane (nanofiltration, ultrafiltration, electrodialysis) technologies [ 14 , 30 , 31 ] provides higher efficiency and allows selective separation of anthocyanins and other polyphenols from multicomponent natural mixtures. Several reviews exist on the sorption and membrane methods used to extract and purify anthocyanins [ 15 , 29 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

“…Using sorption methods [ 28 , 29 , 30 ] in combination with membrane (nanofiltration, ultrafiltration, electrodialysis) technologies [ 14 , 30 , 31 ] provides higher efficiency and allows selective separation of anthocyanins and other polyphenols from multicomponent natural mixtures. Several reviews exist on the sorption and membrane methods used to extract and purify anthocyanins [ 15 , 29 , 32 , 33 ]. Activated carbon and nonpolar or weakly polar porous polymer resins are the most common adsorbents [ 15 , 34 , 35 , 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Anthocyanins by Cation and Anion Exchange Resins with Aromatic and Aliphatic Polymer Matrices

Pismenskaya

Сарапулова

Klevtsova

et al. 2020

IJMS

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This study examines the mechanisms of adsorption of anthocyanins from model aqueous solutions at pH values of 3, 6, and 9 by ion-exchange resins making the main component of heterogeneous ion-exchange membranes. This is the first report demonstrating that the pH of the internal solution of a KU-2-8 aromatic cation-exchange resin is 2-3 units lower than the pH of the external bathing anthocyanin-containing solution, and the pH of the internal solution of some anion-exchange resins with an aromatic (AV-17-8, AV-17-2P) or aliphatic (EDE-10P) matrix is 2–4 units higher than the pH of the external solution. This pH shift is caused by the Donnan exclusion of hydroxyl ions (in the KU-2-8 resin) or protons (in the AV-17-8, AV-17-2P, and EDE-10P resins). The most significant pH shift is observed for the EDE-10P resin, which has the highest ion-exchange capacity causing the highest Donnan exclusion. Due to the pH shift, the electric charge of anthocyanin inside an ion-exchange resin differs from its charge in the external solution. At pH 6, the external solution contains uncharged anthocyanin molecules. However, in the AV-17-8 and AV-17-2P resins, the anthocyanins are present as singly charged anions, while in the EDE-10P resin, they are in the form of doubly charged anions. Due to the electrostatic interactions of these anions with the positively charged fixed groups of anion-exchange resins, the adsorption capacities of AV-17-8, AV-17-2P, and EDE-10P were higher than expected. It was established that the electrostatic interactions of anthocyanins with the charged fixed groups increase the adsorption capacity of the aromatic resin by a factor of 1.8–2.5 compared to the adsorption caused by the π–π (stacking) interactions. These results provide new insights into the fouling mechanism of ion-exchange materials by polyphenols; they can help develop strategies for membrane cleaning and for extracting anthocyanins from juices and wine using ion-exchange resins and membranes.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption of Anthocyanins by Cation and Anion Exchange Resins with Aromatic and Aliphatic Polymer Matrices

Pismenskaya

Сарапулова

Klevtsova

et al. 2020

IJMS

View full text Add to dashboard Cite

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“…Its main characteristic is its high internal surface area developed during activation, formed by thousands of pores classified in micro, meso and macropores. Activated carbons are typically used to purify or separate gas and liquid mixtures [113,114] because of their high adsorption capacity; however, commercially activated carbons generally have high costs which may limit their use. The most common forms in which they are marketed are powdered activated carbon (PAC) and granular activated carbon (GAC).…”

Section: Recovery Of Rare Earth From E-wastementioning

confidence: 99%

“…C60 and other larger fullerenes (C70, C76, C82, and C84) can be viewed as a carbon nanoallotrope with hybridization between sp 2 and sp 3 . The presence of pentagons is essential, introducing curvature and, hence, allowing closing of the cage [113].…”

Section: Recovery Of Rare Earth From E-wastementioning

confidence: 99%

Recovery of Rare Earth Elements by Carbon-Based Nanomaterials—A Review

et al. 2019

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Modern societies depend strongly on electronic and electric equipment (EEE) which has a side effect result on the large production of electronic wastes (e-waste). This has been regarded as a worldwide issue, because of its environmental impact—namely due to non-adequate treatment and storage limitations. In particular, EEE is dependent on the availability of rare earth elements (REEs), considered as the “vitamins” of modern industry, due to their crucial role in the development of new cutting-edge technologies. High demand and limited resources of REEs in Europe, combined with potential environmental problems, enforce the development of innovative low-cost techniques and materials to recover these elements from e-waste and wastewaters. In this context, sorption methods have shown advantages to pre-concentrate REEs from wastewaters and several studies have reported the use of diverse nanomaterials for these purposes, although mostly describing the sorption of REEs from synthetic and mono-elemental solutions at unrealistic metal concentrations. This review is a one-stop-reference by bringing together recent research works in the scope of the application of carbon nanomaterials for the recovery of REEs from water.

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