Photoactive Modified Hydroxyethylcellulose

Nowakowska, Maria; Sterzel, Monika; Szczubiałka, Krzysztof; Guillet, J. E.

doi:10.1002/1521-3927(200211)23:16<972::aid-marc972>3.0.co;2-7

Cited by 15 publications

(14 citation statements)

References 7 publications

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“…Another, widely unnoticed, property of chitosan is its photoluminescence in the ultraviolet region of electromagnetic radiation [17]. Recently, it was shown that biopolymers containing ultraviolet emitting chromophores can be used to induce photochemical reactions such as electron transfer to commonly used herbicide methyl viologen dichloride [19,20] and consequently its photodegradation [21].…”

Section: Introductionmentioning

confidence: 99%

‘Green’ synthesis and optical properties of silver–chitosan complexes and nanocomposites

Božanić

Trandafilović

Luyt

et al. 2010

Reactive and Functional Polymers

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Section: Introductionmentioning

confidence: 99%

‘Green’ synthesis and optical properties of silver–chitosan complexes and nanocomposites

Božanić

Trandafilović

Luyt

et al. 2010

Reactive and Functional Polymers

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“…[3] The use of natural polymers instead of synthetic one is of great interest for practical applications, particularly in biotechnology and environmental protection. [1][2][3][4][5] There is a growing interest in the use of polysaccharides because of their natural abundance in the biosphere. Chitosan is one of the important polysaccharides, which find tremendous applications as a biopolymer.…”

Section: Introductionmentioning

confidence: 99%

“…When an electron acceptor is added to the photoactive polymer, photoinduced electron transfer to the electron acceptor will also occur . The use of natural polymers instead of synthetic one is of great interest for practical applications, particularly in biotechnology and environmental protection . There is a growing interest in the use of polysaccharides because of their natural abundance in the biosphere.…”

Section: Introductionmentioning

confidence: 99%

Radical chemistry of glucosamine naphthalene acetic acid and naphthalene acetic acid: a pulse radiolysis study

Shibin

Sreekanth

Aravind

et al. 2014

J of Physical Organic Chem

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Free radical-induced oxidation reactions of glucosamine naphthalene acetic acid (GNaa) and naphthalene acetic acid (Naa) have been studied using pulse radiolysis. GNaa was synthesized by covalently attaching Naa on glucosamine. Hydroxyl adduct (from the reaction of hydroxyl radicals ( • OH) at the naphthalene ring) was identified as the major transient intermediate (suggesting that the • OH reaction is on the naphthalene ring) and is characterized by its absorption maxima of 340 and 400 nm. Both GNaa and Naa undergo similar reaction pattern. The bimolecular rate constants determined for the reactions are 4.8 × 10 9 and 8.9 × 10 9 dm 3 mol À1 s À1 for GNaa and Naa respectively. The mechanism of reaction of • OH with GNaa was further confirmed using steady-state method. Radical cation of GNaa was detected as an intermediate during the reaction of sulfate radical (SO 4•À ) with GNaa (k 2 = 4.52 × 10 9 dm 3 mol À1 s À1 ). This radical cation transforms to a • OH adduct at higher pH. The radical cation of GNaa is comparatively long lived, and a cyclic transition state by neighboring group participation accounts for its stability. The oxy radical anion (O •À ) reacts with GNaa (k 2 = 1.12 × 10 9 dm 3 mol À1 s À1 ) mainly by one-electron transfer mechanism. The reduction potential values of Naa and GNaa were determined using cyclic voltammetric technique, and these are 1.39 V versus NHE for Naa and 1.60 V versus NHE for GNaa.

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“…The growing interest in using natural materials for practical applications led us to the synthesis of photosensitizers based on polysaccharides9, 10—the most abundant biopolymers on earth. The main goal for developing these polymers was to obtain alternative, environmentally friendly (biodegradable) photocatalytic systems that can operate with visible or solar light to conduct an efficient degradation of a wide range of pollutants 10–12.…”

Section: Introductionmentioning

confidence: 99%

Environmentally friendly photosensitizer: starch modified with chlorophyll‐type chromophores

Nowakowska

Zapotoczny

Sterzel

2007

Polymer International

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A novel water‐soluble polymeric photosensitizer (SPheo) based on starch and containing pheophorbide (Pheo), a chlorophyll‐derived chromophore, was synthesized and its photophysical and photochemical properties were studied. Pheo chromophores attached to the polymeric chains of starch absorb light of the UV‐visible spectral region. The clustering of hydrophobic Pheo chromophores results in the formation of hydrophobic microdomains in aqueous solution where organic molecules can be solubilized. SPheo polymer efficiently photosensitizes reactions mediated by energy and/or electron transfer from the electronically excited chromophores to the molecules of organic compounds solubilized in polymeric microdomains or residing in water. Copyright © 2007 Society of Chemical Industry

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Photoactive Modified Hydroxyethylcellulose

Cited by 15 publications

References 7 publications

‘Green’ synthesis and optical properties of silver–chitosan complexes and nanocomposites

‘Green’ synthesis and optical properties of silver–chitosan complexes and nanocomposites

Radical chemistry of glucosamine naphthalene acetic acid and naphthalene acetic acid: a pulse radiolysis study

Environmentally friendly photosensitizer: starch modified with chlorophyll‐type chromophores

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