NDLI: Preparation and Function of Poly(acrylic acid)s Modified by Supramolecular Complex Composed of Porphinatoiron and a Cyclodextrin Dimer That Bind Diatomic Molecules $(O

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Preparation and Function of Poly(acrylic acid)s Modified by Supramolecular Complex Composed of Porphinatoiron and a Cyclodextrin Dimer That Bind Diatomic Molecules $(O_{2}$ and CO) in Aqueous Solution

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kano, Koji Ochi, Toshiro Okunaka, Sayuri Ota, Yusuke Karasugi, Keiichi Ueda, Takunori Kitagishi, Hiroaki
Description	Country affiliation: Japan Author Affiliation: Kano K ( Department of Molecular Chemistry and Biochemistry, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan. kkano@mail.doshisha.ac.jp)
Abstract	Poly(acrylic acid) (PAA) is modified by 5-(4-β-alanylaminophenyl)-10,15,20-tris(4-sulfonatophenyl) porphinatoiron(III) to yield iron porphyrin-bearing PAAs (FeP(n)s) through a condensation reaction. FeP(n)s were further functionalized by Py3CD, which is a per-O-methylated β-cyclodextrin (CD) dimer with a pyridine linker and includes the porphyrin pendants to form ferric hemoCD-P(n)s. Ferrous hemoCD-P(3), having three porphyrin chromophores in a polymer chain, is shown to bind molecular oxygen $(P_{1/2}=7.9±1.4 Torr)$ in aqueous solution at pH 7.0 and 25 °C, affording oxy-hemoCD-P(3). Oxy-hemoCD-P(3) is biphasically autoxidized to ferric hemoCD-P(3), with 27 % of the dioxygen adducts being rapidly oxidized. The rate of autoxidation of oxy-hemoCD-P(15), having 15 porphyrin chromophores in a polymer chain, was much faster than that of oxy-hemoCD-P(3), thus suggesting self-catalyzed autoxidation of oxy-hemoCD-P(n)s. Oxy-hemoCD-P(n)s are markedly stabilized by catalase, thereby indicating that hydrogen peroxide generated from oxy-hemoCD-P(n) accelerates the autoxidation. Most of the hemoCD-P(3) molecules injected into the femoral vein of a rat remained in the body, though about 16 % of the hemoCD-P(3) molecules were excreted in the urine as a carbon monoxide adduct.
File Format	HTM / HTML
ISSN	18614728
Issue Number	11
Volume Number	6
e-ISSN	1861471X
Journal	Chemistry - An Asian Journal
Language	English
Publisher	Wiley-VCH
Publisher Date	2011-11-04
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Water Research Support, Non-u.s. Gov't Carbon Monoxide Delayed-action Preparations Male Iron Journal Article Spectrometry, Mass, Matrix-assisted Laser Desorption-ionization Beta-cyclodextrins Catalase Solutions Discipline Chemistry Hydrogen-ion Concentration Diatoms Blood Substitutes Polymers Pyridines Oxygen Rats Chemical Synthesis Pharmacology Metalloporphyrins Metabolism Acrylates Magnetic Resonance Imaging Chemistry Animals Analysis Oxidation-reduction Superoxides Pharmacokinetics
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry

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Preparation and Function of Poly(acrylic acid)s Modified by Supramolecular Complex Composed of Porphinatoiron and a Cyclodextrin Dimer That Bind Diatomic Molecules $(O_{2}$ and CO) in Aqueous Solution

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