Characterization of Mn(III)porphyrin immobilized on modified silica surfaces by EXAFS spectroscopy: A promising tool for analysis of supported metalloporphyrin catalysts

Ferreira, Alba D.Q.; Vinhado, Fábio S.; Iamamoto, Yassuko

doi:10.1016/j.molcata.2005.07.039

Cited by 26 publications

(10 citation statements)

References 35 publications

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“…In order to solve this problem, the immobilization of this catalyst must allow its simple recuperation as well as facilitate its reutilization [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Hexagonal mesoporous silica modified with copper phthalocyanine as a photocatalyst for pesticide 2,4-dichlorophenoxiacetic acid degradation

DeOliveira

Neri

Ribeiro

et al. 2008

Journal of Colloid and Interface Science

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“…In order to solve this problem, the immobilization of this catalyst must allow its simple recuperation as well as facilitate its reutilization [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Hexagonal mesoporous silica modified with copper phthalocyanine as a photocatalyst for pesticide 2,4-dichlorophenoxiacetic acid degradation

DeOliveira

Neri

Ribeiro

et al. 2008

Journal of Colloid and Interface Science

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“…[4][5][6][7] The authors also have reported that M-Ps immobilized ion-exchange-resins or -glass-beads have a practical use in the flow injection analyses as a solid mimetic of catalase or HRP. [8][9][10][11][12] However, those solid mimetics are not practically applicable to the batch method because of troublesome procedures required for the separation and the like.…”

Section: )mentioning

confidence: 99%

Peroxidase-Like Catalytic Activity of Aqueous- and Immobilized-Mn3+-octabromo-porphyrins on Ion-Exchange Resin Supplied as Mimetic of Horseradish Peroxidase

Kitamura

Mori

Yamamoto

et al. 2008

CHEMICAL & PHARMACEUTICAL BULLETIN

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In order to explore the capability of metal porphyrins as an alternative of horseradish peroxidase (HRP), HRP-like activity of three manganese-porphyrins (Mn-Ps) and three Mnoctabromo-porphyrins (Mn-OBPs) was examined in both aqueous and immobilized states. It was found that Mn 3؉-octabromotetrakis(1-methyl-pyridinium-4yl)porphine (Mn-OBTMPyP) has an activity of at least 90% of HRP in an aqueous solution. Mn-OBTMPyP exhibited a catalytic activity even in the presence of hydrogen peroxide without suicide reaction. In addition, Mn-OBTMPyP was revealed to function as an alternative to HRP in the quantitative determination of serum uric acid. These results are of great interest because they indicate that metal-octabromo-porphyrins possibly include promising candidates of artificial enzyme capable of substituting for HRP.Key words horseradish-peroxidase; mimetic; manganese-porphyrin; brominationThe metal-porphyrins (M-Ps) constitute the active center of enzymes such as catalase and horseradish peroxidase (HRP) used frequently in the clinical chemistry, and their HRP-like catalytic activities have long been investigated. 1)Generally, M-Ps have been regarded to be unavailable as a catalyst in an aqueous solution, because the HRP-like activity is accompanied by a suicide reaction which results in the decomposition of M-Ps.2,3) To avoid the suicide reaction, MPs of immobilized state have been developed and reported to be useful as an enzyme mimetics. [4][5][6][7] The authors also have reported that M-Ps immobilized ion-exchange-resins or -glass-beads have a practical use in the flow injection analyses as a solid mimetic of catalase or HRP. [8][9][10][11][12] However, those solid mimetics are not practically applicable to the batch method because of troublesome procedures required for the separation and the like.Recently, metal-octabromo-porphyrins (M-OBPs), which are resistant to oxidation, have been developed and elucidated their physical properties [13][14][15][16][17] as well as enzyme-like catalytic activities such as P450-, 18) superoxide dismutase- 19) and peroxidase-like catalytic activities on an organic-hydroperoxide. 20) In the present study, we examined the HRPlike activities of six different ionic manganese-porphyrins (Mn-Ps) and Mn-OBPs (see Fig. 1) in both the aqueous state and the solid-state wherein the substance was immobilized on ion-exchange-resin for the purpose of evaluating the capability as an artificial enzyme substituting for HRP. Based on the results, we then examined the applicability of a Mn-OBP, which showed a catalytic activity in a solution, to clinical chemistry. ExperimentalMn-tetrakis(4-sulfophenyl)porphine (Mn-TSPP) was prepared according to the method of Pasternack et al. 21) from commercially available H 2 -TSPP and MnCl 2 · 4H 2 O as an aqueous solution. Mn-TMPyP was prepared in the following manner. A mixture of commercially available H 2 -TMPyP and MnCl 2 · 4H 2 O in sodium acetate solution was refluxed for 3 h, followed by addition of sodium perchlorate solution to precipitate Mn-...

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“…It can be overcome by immobilising metalloporphyrins to insoluble solid supports. Oxides [4][5][6] or organic polymers [7][8][9][10][11] in recent years have been carried out in order to obtain epoxidation systems and mimic the action of hemeenzymes such as peroxidases 12 and cytochrome P-450 [13][14][15] because of the support environment. Metalloporphyrin-immobilized molecular sieve presents many advantages such as replacement of molecular sieve as the protein portion of natural enzymes, providing a controlled steric environment for metalloporphyrins and serving as a model for the active site of cytochrome P-450.…”

Section: Introductionmentioning

confidence: 99%

Surface-functionalized Hexagonal Mesoporous Silica Supported 5-(4-Carboxyphenyl)-10,15,20-triphenyl Porphyrin Manganese(III) Chloride and Their Catalytic Activity

Zhang¹,

Jiang

Zhang³

et al. 2012

Bulletin of the Korean Chemical Society

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Manganese(III) 5-(4-carboxyphenyl)-10,15,20-triphenyl porphyrin chloride (Mn(TCPP)Cl) was grafted through amide bond on silica zeolite Y (HY), zeolite beta (Hβ) and hexagonal mesoporous silica (HMS). XRD, ICP-AES, N 2 physisorption, SEM, TEM, FTIR and thermal analysis were employed to analyse these novel heterogeneous materials. These silica supported catalysts were shown to be used for epoxidation and good shape selectivity was observed. The effect of support structure on catalytic performance was also discussed. The catalytic activity remained when the catalysts were recycled five times. The energy changes about epoxidation of alkenes by NaIO 4 and H 2 O 2 were also computationally calculated to explain the different catalytic efficiency.

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Characterization of Mn(III)porphyrin immobilized on modified silica surfaces by EXAFS spectroscopy: A promising tool for analysis of supported metalloporphyrin catalysts

Cited by 26 publications

References 35 publications

Hexagonal mesoporous silica modified with copper phthalocyanine as a photocatalyst for pesticide 2,4-dichlorophenoxiacetic acid degradation

Hexagonal mesoporous silica modified with copper phthalocyanine as a photocatalyst for pesticide 2,4-dichlorophenoxiacetic acid degradation

Peroxidase-Like Catalytic Activity of Aqueous- and Immobilized-Mn3+-octabromo-porphyrins on Ion-Exchange Resin Supplied as Mimetic of Horseradish Peroxidase

Surface-functionalized Hexagonal Mesoporous Silica Supported 5-(4-Carboxyphenyl)-10,15,20-triphenyl Porphyrin Manganese(III) Chloride and Their Catalytic Activity

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