Photochemical Reactions of Carbohydrates

Binkley, Roger W.

doi:10.1016/s0065-2318(08)60310-8

Cited by 37 publications

(5 citation statements)

References 157 publications

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“…In addition, RF can also directly oxidize a suitable substrate by electron abstraction in the absence of molecular oxygen. 21,26,27 The final photochemical degradation of the polymer is frequently attributed [28][29][30][31] to the oxidative cleavage of glycosidic bonds.…”

Section: Resultsmentioning

confidence: 99%

“…The distribution between the processes depends on the experimental conditions, and one of the processes may be dominant in a specific system. In addition, RF can also directly oxidize a suitable substrate by electron abstraction in the absence of molecular oxygen. ,, The final photochemical degradation of the polymer is frequently attributed − to the oxidative cleavage of glycosidic bonds.…”

Section: Resultsmentioning

confidence: 99%

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Riboflavin-Photosensitized Changes in Aqueous Solutions of Alginate. Rheological Studies

et al. 2003

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Interactions between photoexcited riboflavin (RF), promoted by irradiation in the range of 310-800 nm, and alginate have been studied in air equilibrated aqueous solutions with the aid of rheological methods. Light irradiation of RF causes under aerobic conditions fragmentation of alginate and a decrease in the shear viscosity and other rheological parameters of its solutions. The decrease is most pronounced in concentrated polymer solutions. The photochemical degradation of alginate is inhibited in the presence of the quenchers/scavengers d-mannitol, glutathione, potassium iodide, and sodium azide and in excess oxygen. The addition of thiourea to alginate-RF solutions leads to enhanced degradation of the polymer. Significant shear-thinning effects and deviations from the Cox-Merz rule are observed at higher polymer concentrations.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Riboflavin-Photosensitized Changes in Aqueous Solutions of Alginate. Rheological Studies

et al. 2003

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“…Here in we wish to report our work on the regioselective tosylation of ene‐tetrols having 1,2,3,4‐tetrol (Figure ) moiety derived from D‐pentoses which expands the scope of carbohydrate chemistry for the total synthesis of many bioactive natural products. Tosylated glycopyranosides offers stereo defined templates for the synthesis of many natural products therefore selective monotosylation of pyranosdies remains a specific filed of active research ,. These organo stannylene acetals of pyranosides were used for regioselective protection of various types of alcohols.…”

Section: Introductionmentioning

confidence: 99%

[DMAPTs]⁺ Cl⁻ : A Promising Versatile Regioselective Tosyl Transfer Reagent

et al. 2017

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Regioselective monotosylation, for the first time on 2,4-syn & 2,4-anti configured ene-tetrols and on diols & triols was achieved in excellent yields and selectivity by employing [DMAPTs] + Cl À , 1. We also proposed and developed operational flexible preferential regio-complimentary tosylation of cis-1,2-diol moiety of pyranosides by employing 1. Further NMR correlation for unambiguous structure determination of regioselectivity and also preferred conformations of these pyranosides were established.

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“…In the type II process, triplet RF transfers energy to oxygen to form singlet oxygen ( 1 O 2 ) that subsequently oxidates the substrate. Both type I and type II processes can take place simultaneously, and the final photochemical degradation of the polymer is frequently attributed − to the oxidative cleavage of glycosidic bonds.…”

Section: Introductionmentioning

confidence: 99%

Rheological Characterization of Photochemical Changes of Ethyl(hydroxyethyl)cellulose Dissolved in Water in the Presence of an Ionic Surfactant and a Photosensitizer

Kjøniksen

Nyström

2004

Biomacromolecules

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The effects of addition of the photosensitizer riboflavin (RF) to semidilute solutions of the systems ethyl(hydroxyethyl)cellulose (EHEC)/water, EHEC/sodium dodecyl sulfate (SDS), and EHEC/cetyltrimethylammonium bromide (CTAB) on the turbidity and the linear viscoelasticity are studied. The turbidity behavior and the cloud point (CP) are influenced by the addition of RF to the EHEC/SDS system, whereas no discernible change is observed for the other systems. The rheological features of all systems are affected by the presence of RF at lower temperatures, whereas at temperatures close to the CP, only a slight effect is detected. Both the EHEC/SDS and EHEC/CTAB systems evolve thermoreversible gels at the same temperature (37.5 degrees C), but in the presence of RF, the EHEC/CTAB system does not form a gel, whereas the gel temperature for the EHEC/SDS system is depressed (32.5 degrees C). Light irradiation of RF in the EHEC/SDS/RF system causes fragmentation of the network and a higher temperature is required to re-form the incipient gel network. The photochemical degradation of EHEC gives rise to a decrease in the dynamic moduli and the complex viscosity for all of the three systems. The effect is strengthened at higher temperatures and it is most pronounced for the EHEC/SDS system.

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Photochemical Reactions of Carbohydrates

Cited by 37 publications

References 157 publications

Riboflavin-Photosensitized Changes in Aqueous Solutions of Alginate. Rheological Studies

Riboflavin-Photosensitized Changes in Aqueous Solutions of Alginate. Rheological Studies

[DMAPTs]⁺ Cl⁻ : A Promising Versatile Regioselective Tosyl Transfer Reagent

Rheological Characterization of Photochemical Changes of Ethyl(hydroxyethyl)cellulose Dissolved in Water in the Presence of an Ionic Surfactant and a Photosensitizer

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Photochemical Reactions of Carbohydrates

Cited by 37 publications

References 157 publications

Riboflavin-Photosensitized Changes in Aqueous Solutions of Alginate. Rheological Studies

Riboflavin-Photosensitized Changes in Aqueous Solutions of Alginate. Rheological Studies

[DMAPTs]+ Cl− : A Promising Versatile Regioselective Tosyl Transfer Reagent

Rheological Characterization of Photochemical Changes of Ethyl(hydroxyethyl)cellulose Dissolved in Water in the Presence of an Ionic Surfactant and a Photosensitizer

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[DMAPTs]⁺ Cl⁻ : A Promising Versatile Regioselective Tosyl Transfer Reagent