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Monday, May 4, 2020 | History

2 edition of Photochemical transformations of phenolic compounds added to marine surface microlayers found in the catalog.

Photochemical transformations of phenolic compounds added to marine surface microlayers

Kaijun Lin

Photochemical transformations of phenolic compounds added to marine surface microlayers

by Kaijun Lin

  • 103 Want to read
  • 1 Currently reading

Published .
Written in English

    Subjects:
  • Phenols.,
  • Photochemistry.

  • Edition Notes

    Statementby Kaijun Lin.
    The Physical Object
    Pagination94 leaves, bound :
    Number of Pages94
    ID Numbers
    Open LibraryOL15188345M

    body. The most important of these bioactive constituents of plants are alkaloids, tannins, flavonoids and phenolic compounds. Many of the indigenous medicinal plants are used as spices and food plants. They also sometimes added to foods meant for pregnant women and nursing mothers for medicinal purposes as reported by Okwu, D. E. Effects of different phenolic compounds on stability of biological membranes BIOCHEMICAL EFFECTS OF DIFFERENT PHENOLIC COMPOUNDS ON OREOCHROMIS MOSSAMBICUS (PETERS) temperature. Then ml of the phenolic compounds was added (such that the final concentration was 1/10, 1/5 and 1/3 of LC50 value of the phenolic compounds).

      If we roughly estimate that around 30% of the ocean surface (assumed to be × 10 8 km 2) is enriched by surfactant, depending on season, 53 and that 50% of the time the surface of the ocean is illuminated, then we can estimate that the photochemical flux of isoprene ranges from to 35 Tg yr –1, adding to reported biological by:   Introduction. Aerosols and low-altitude reflective clouds in the marine boundary layer have been shown to impact the climate system as a whole, 1,2 triggering substantial research on the origin and chemical composition of marine aerosols. While primary sources originate from bubble bursting (producing sea-salt), secondary sources are believed to derive from the gas-to-particle Cited by:

    ABSTRACT: The photocatalytic degradation of phenol in a static-batch photoreactor, using a UV lamp as a light source and TiO 2 as a photocatalyst, was investigated. The effects of various parameters, such as photocatalyst dosage, initial substrate concentration, reaction pH and addition of oxidants, on the phenol degradation rate of TiO 2 photocatalysis were examined. Transformations of Phenolic Compounds in an in vitro Model Simulating the Human Alimentary Tract Tomasz Tarko*, Aleksandra Duda-Chodak, Pawe³ Sroka, Pawe³ Satora and Jolanta Michalik Department of Fermentation Technology and Technical Microbiology, Food Technology Institute, University of Agriculture in Krakow, ul. Balicka , PL Cited by:


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Photochemical transformations of phenolic compounds added to marine surface microlayers by Kaijun Lin Download PDF EPUB FB2

Graduate Thesis Or Dissertation Photochemical transformations of phenolic compounds added to marine surface microlayers Public Deposited.

Analytics × Add to Author: Kaijun Lin. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link). Photochemical versus coupled photochemical–biological flow system for the treatment of two biorecalcitrant herbicides: metobromuron and isoproturon.

Applied Catalysis B: Environmental. These reactions drive chemical fluxes that may be coupled to other Top Boundary Layer processes in three ways: (1) modification of air-sea gas exchange processes and fluxes, (2) chemical modification of trace components of the Top Boundary Layer, especially of species with long residence times there (indigenous biota, surface-active molecules Author: Oliver C.

Zafiriou. The sea surface microlayer often has greater concentrations of dissolved organic material (DOM) than subsurface water1–5, but the chemical nature Cited by: Photochemical reactions are an important class of abiotic pathways for dissolved pollutants in surface waters (Tixier et al., ).

They are usually divided into direct photolysis, where absorption of sunlight by the pollutant causes its transformation, and indirect by: Request PDF | Photochemical transformation of tetrabromobisphenol A and related phenols in water | A method was developed for studies of the phototransformation at UV irradiation of aqueous.

Photochemical reactions can cause significant transformations of manufactured nanomaterials in sunlit environments. While transformations of inorganic nanoparticles (NPs) have been investigated extensively, less attention has been focused on the direct impact of aqueous photochemical reactions on adsorbed organic macromolecules that form the NP corona and strongly influence the surface Cited by: 5.

The purpose is to simulate the transformations that aromatic compounds undergo on the surface of dispersed particles in the : Davide Vione. Photochemistry-chemical reactions initiated by light-energy is absorbed or emitted by matter in discrete quanta called photons-absorption of light leads to an electronic excitation (ground state→excited state)-promote an e-like n→π∗ or π→π∗-most chemistry takes place from S1 and T1 excited states E = hν = hc/ λ.

PHOTOCHEMICAL TRANSFORMATIONS OF PHENOLIC COMPOUNDS ADDED TO MARINE SURFACE MICROLAYERS 1. INTRODUCTION The air-sea interface is important in many global chemical and geochemical cycles, because it covers 71% of the earth's surface and because all energy and material exchanged between atmosphere and ocean must cross the air-sea interface.

A sustainable process of valorization of lignocellulosic biomass exploring the extraction and separation of high value phenolic compounds was developed. A scale-up pretreatment and fractionation process of biomass assisted by 1-ethylmethylimidazolium acetate ([emim][OAc]) ionic liquid (IL) was carried out at first.

Thereafter, recovered IL formed a sample rich in phenolic compounds, which. Abstract. Phenols are a diverse group of organic chemicals consisting of a basic benzene ring and one or more hydroxyl groups.

Simple phenol (hydroxybenzene, C 6 H 5 OH) was isolated in from coal tar. Although this was the only source of phenol until World War I, synthetic production gradually grew in importance and, byexceeded natural production.

DOE PAGES Journal Article: Molecular transformations of phenolic SOA during photochemical aging in the aqueous phase: competition among oligomerization, functionalization, and fragmentation Title: Molecular transformations of phenolic SOA during photochemical aging in the aqueous phase: competition among oligomerization, functionalization, and fragmentationAuthor: Yu, Lu.

Phenolic compounds make up one of the major families of secondary metabolites in plants, and they represent a diverse group of compounds. Phenolics can be broadly divided into non-soluble compounds such as condensed tannins, lignins, and cell-wall bound hydroxycinammic acids, and soluble phenolics such as phenolic acids, phenylpropanoids.

Therefore, if they photochemically degrade, it will be through indirect photochemical reactions. Sulfur compounds undergo a variety of indirect photochemical transformations in aqueous media, especially alkyl sulfides, disulfides, and thiols involving an array of reactants including the superoxide anion, hydroxyl radical, hydrogen peroxide, and singlet by: The power of light in polymer science: photochemical processes to manipulate polymer formation, structure, and properties.

Shunsuke Chatani a, Christopher J. Kloxin b and Christopher N. Bowman * ac a Department of Chemistry and Biochemistry, University of Cited by:   To this end, we manipulated water from three boreal lakes using preincubations with UV light to simulate photochemical transformations and polyvinylpyrrolidone (PVP) to remove colored phenolic compounds.

Thereafter, we assessed the contribution of compounds lost or transformed after the respective treatment to the reactivity continuum of bulk by:   The sea-surface microlayer (SML) has different physical, chemical and biological properties compared to the subsurface water, with an enrichment of organic matter i.e., Cited by:   For the bound phenolic compounds, the results revealed that the acid hydrolysis method led to the release of far more bound phenolic compounds from the residue of litchi pulp than the alkaline hydrolysis, where free phenolic compounds had been extracted with 80% acetone (p phenolic, flavonoid and hydrolysed tannin Cited by:.

This review paper describes briefly the cloud aqueous phase composition and deeply its reactivity in the dark and mainly under solar radiation.

The role of the main oxidants (hydrogen peroxide, nitrate radical, and hydroxyl radical) is presented with a focus on the hydroxyl radical, which drives the oxidation capacity during the day.

Its sources in the aqueous phase, mainly through Author: Angelica Bianco, Monica Passananti, Marcello Brigante, Gilles Mailhot.CiteScore: ℹ CiteScore: CiteScore measures the average citations received per document published in this title.

CiteScore values are based on citation counts in a given year (e.g. ) to documents published in three previous calendar years (e.g. – 14), divided by the number of documents in these three previous years (e.g.

– 14).Evaluation of the total phenolic compounds content The total phenolic compounds content in each extract was evaluated by spectrophotometry using the Folin-Ciocalteu method (Singleton & Rossi, ; Scalbert et al., ) with some modifications.

Briefly, ml portion of Folin-Ciocalteu reagent N was mixed with ml of the sample.