Adsorption of Cu(II) on porous chitosan membranes functionalized with histidine

Beppu, Marisa M.

doi:10.1016/j.memsci.2004.04.025

Cited by 120 publications

(53 citation statements)

References 17 publications

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“…For epichlorohydrin activation, 10 g gel was suspended in 100 ml 2 M NaOH solution containing 0.6 g NaBH 4 . Then, 10 ml epichlorohydrin was slowly added, and the suspension was kept in an ice bath for 15 h [2]. Glyceryl supports (activated with glycidol and epichlorohydrin) were further suspended in 60 ml Milli-Q water and 30 ml 0.1 M sodium periodate to produce glyoxyl groups [10].…”

Section: Bead Activationmentioning

confidence: 99%

Multipoint covalent immobilization of lipase on chitosan hybrid hydrogels: influence of the polyelectrolyte complex type and chemical modification on the catalytic properties of the biocatalysts

Mendes

Castro

Rodrigues

et al. 2010

J Ind Microbiol Biotechnol

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This work aimed at the production of stabilized derivatives of Thermomyces lanuginosus lipase (TLL) by multipoint covalent immobilization of the enzyme on chitosan-based matrices. The resulting biocatalysts were tested for synthesis of biodiesel by ethanolysis of palm oil. Different hydrogels were prepared: chitosan alone and in polyelectrolyte complexes (PEC) with κ-carrageenan, gelatin, alginate, and polyvinyl alcohol (PVA). The obtained supports were chemically modified with 2,4,6-trinitrobenzene sulfonic acid (TNBS) to increase support hydrophobicity, followed by activation with different agents such as glycidol (GLY), epichlorohydrin (EPI), and glutaraldehyde (GLU). The chitosan-alginate hydrogel, chemically modified with TNBS, provided derivatives with higher apparent hydrolytic activity (HA(app)) and thermal stability, being up to 45-fold more stable than soluble lipase. The maximum load of immobilized enzyme was 17.5 mg g(-1) of gel for GLU, 7.76 mg g(-1) of gel for GLY, and 7.65 mg g(-1) of gel for EPI derivatives, the latter presenting the maximum apparent hydrolytic activity (364.8 IU g(-1) of gel). The three derivatives catalyzed conversion of palm oil to biodiesel, but chitosan-alginate-TNBS activated via GLY and EPI led to higher recovered activities of the enzyme. Thus, this is a more attractive option for both hydrolysis and transesterification of vegetable oils using immobilized TLL, although industrial application of this biocatalyst still demands further improvements in its half-life to make the enzymatic process economically attractive.

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Section: Bead Activationmentioning

confidence: 99%

Multipoint covalent immobilization of lipase on chitosan hybrid hydrogels: influence of the polyelectrolyte complex type and chemical modification on the catalytic properties of the biocatalysts

Mendes

Castro

Rodrigues

et al. 2010

J Ind Microbiol Biotechnol

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“…In 2004, Beppu et al, [17] have reported the preparation of histidine functionalized chitosan membrane for the removal of Cu 2+ from aqueous solution. The results observed in this study indicated that the immobilization of histidine on porous chitosan membranes presented synergy with porosity and this synergy may be negative or positive, depending on the initial membrane porosity.…”

Section: Chitosan Membranes Reported In Literaturesmentioning

confidence: 99%

A Short Review on Chitosan Membrane for Biomolecules Immobilization

JF¹

2015

J Mol Genet Med

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Chitosan is an important natural polymer that occurs in the world. Chitosan is soluble in acidic aqueous media and it can be obtained in various forms. It is widely used for many applications. Hence, we briefly describe the role of chitosan in membrane form, an important area of research in which a variety of synthetic methods has been proposed and their significance is explained. Thus, this review emphasizes the papers on the high value-added applications of these chitosan membranes in diverse fields such as medicine, biological, cosmetics and nanotechnology.

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“…Copper is an essential micronutrient, vital for the body in small amounts. However, humans can present symptoms from temporary stomach and intestinal disorders to kidney or liver damage at high amount over 1.3 mg·dm -3 [2]. Lead intoxication has been a problem throughout history [3,4], adverse health effects of lead are well documented: it may cause severe damage to the kidney, nervous system, reproductive system, liver and brain and causes sickness or death [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…And it becomes mandatory for the removal of lead from drinking and wastewaters. Therefore, several processes have been used and developed over years to remove such metals from industrial wastewater: biological process [13][14][15], ion exchange [16], membrane filtration [17,18], adsorption or electrochemical recovery [19,20] et al For the adsorption task, both inorganic [21,22] and organic especially polymeric materials [23] have been explored successfully for years. Many techniques have been suggested in the literature for the synthesis of polymeric adsorbents [24,25].…”

Section: Introductionmentioning

confidence: 99%