Chemical Composition of Secondary Organic Aerosol Formed from the Oxidation of Semivolatile Isoprene Epoxydiol Isomerization Products DOI
Molly Frauenheim, John H. Offenberg, Zhenfa Zhang

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(51), P. 22571 - 22582

Published: Dec. 12, 2024

3-Methylenebutane-1,2,4-triol and 3-methyltetrahydrofuran-2,4-diols, previously designated "C5-alkene triols", were recently confirmed as in-particle isomerization products of isoprene-derived β-IEPOX isomers that are formed upon acid-driven uptake partition back into the gas phase. In chamber experiments, we have systematically explored their phase oxidation by hydroxyl radical (•OH) a potential source secondary organic aerosol (SOA). •OH-initiated both compounds in presence ammonium bisulfate resulted substantial volume growth. Compositions low-volatility particulate phases established high-resolution mass spectrometry measurements. Under conditions mimicking Southeast USA (50% relative humidity, bulk seed pH 1.4), estimate SOA yield from 3-methylenebutane-1,2,4-triol to be 93.1%, equating 1.95 ± 0.81 Tg C Yr-1, 3-methyltetrahydrofuran-2,4-diol 26.7%, 1.76 1.26 Yr-1. Previously unreported products, 2,3-dihydroxy-2-(hydroxymethyl)propanal, 1,3,4-trihydroxybutan-2-one, four organosulfates been ambient SOA, aid understanding isoprene pathways HO2• dominated environments NOx levels continue decline US. This work underlines need for inclusion partitioning semivolatile atmospheric models.

Language: Английский

Valorization of food processing waste byproducts for essential oil production and their application in food system DOI Creative Commons

Elsayed AE Ali,

Dina Mostafa Mohammed,

Fatma Abd El Gawad

et al.

Waste Management Bulletin, Journal Year: 2025, Volume and Issue: unknown, P. 100200 - 100200

Published: April 1, 2025

Language: Английский

Citations

0
Anthropogenic Extremely Low Volatility Organics (ELVOCs) Govern the Growth of Molecular Clusters Over the Southern Great Plains During the Springtime DOI Creative Commons
Manish Shrivastava, Jie Zhang, R. A. Zaveri

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(21)

Published: Oct. 29, 2024

Abstract New particle formation (NPF) often drives cloud condensation nuclei concentrations and the processes governing nucleation of molecular clusters vary substantially in different regions. The growth these from ∼2 to >10 nm diameters is driven by availability extremely low volatility organic vapors (ELVOCs). Although pathways ELVOC oxidation biogenic terpenes are better understood, mechanistic for anthropogenic organics less well understood. We integrate measurements detailed regional model simulations understand NPF secondary aerosol at Southern Great Plain (SGP) observatory Oklahoma compare with a site within Bankhead National Forest (BNF) Alabama, southeast USA. During our two simulated event days, rates predicted be least an order magnitude higher SGP compared BNF largely due lower sulfuric acid (H 2 SO 4 ) BNF. Among mechanisms WRF‐Chem, we find that dimethylamine (DMA) + H mechanism dominates SGP. ELVOCs critical explaining particles observed Treating as semisolid, strong diffusion limitations vapor uptake phase, brings predictions into closer agreement observations. also simulate non‐NPF days show low‐level clouds reduce photochemical activity corresponding reductions concentrations, thereby lack NPF.

Language: Английский

Citations

2
Prospecting Pharmacologically Active Biocompounds from the Amazon Rainforest: In Vitro Approaches, Mechanisms of Action Based on Chemical Structure, and Perspectives on Human Therapeutic Use DOI Creative Commons
Andryo Orfi Almada-Vilhena, Oscar Vinícius Moraes dos Santos, Milla de Andrade Machado

et al.

Pharmaceuticals, Journal Year: 2024, Volume and Issue: 17(11), P. 1449 - 1449

Published: Oct. 30, 2024

The Amazon rainforest is an important reservoir of biodiversity, offering vast potential for the discovery new bioactive compounds from plants. In vitro studies allow investigation biological processes and interventions in a controlled manner, making them fundamental pharmacological biotechnological research. These approaches are faster less costly than vivo studies, providing standardized conditions that enhance reproducibility precision data. However, methods have limitations, including inability to fully replicate complexity living organism absence complete physiological context. Translating results models not always straightforward, due differences pharmacokinetics interactions. this context, aim literature review assess advantages disadvantages search drugs Amazon, identifying challenges limitations associated with these comparing testing. Thus, bioprospecting involves evaluating plant extracts through bioassays investigate pharmacological, antimicrobial, anticancer activities. Phenolic terpenes frequently identified as main agents, exhibiting antioxidant, anti-inflammatory, antineoplastic Chemical characterization, molecular modifications, development delivery systems, such nanoparticles, highlighted improve therapeutic efficacy. Therefore, offers great drugs; however, significant challenges, standardization extraction need clinical trials, must be overcome become viable medications.

Language: Английский

Citations

1
Chemical Composition of Secondary Organic Aerosol Formed from the Oxidation of Semivolatile Isoprene Epoxydiol Isomerization Products DOI
Molly Frauenheim, John H. Offenberg, Zhenfa Zhang

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(51), P. 22571 - 22582

Published: Dec. 12, 2024

3-Methylenebutane-1,2,4-triol and 3-methyltetrahydrofuran-2,4-diols, previously designated "C5-alkene triols", were recently confirmed as in-particle isomerization products of isoprene-derived β-IEPOX isomers that are formed upon acid-driven uptake partition back into the gas phase. In chamber experiments, we have systematically explored their phase oxidation by hydroxyl radical (•OH) a potential source secondary organic aerosol (SOA). •OH-initiated both compounds in presence ammonium bisulfate resulted substantial volume growth. Compositions low-volatility particulate phases established high-resolution mass spectrometry measurements. Under conditions mimicking Southeast USA (50% relative humidity, bulk seed pH 1.4), estimate SOA yield from 3-methylenebutane-1,2,4-triol to be 93.1%, equating 1.95 ± 0.81 Tg C Yr-1, 3-methyltetrahydrofuran-2,4-diol 26.7%, 1.76 1.26 Yr-1. Previously unreported products, 2,3-dihydroxy-2-(hydroxymethyl)propanal, 1,3,4-trihydroxybutan-2-one, four organosulfates been ambient SOA, aid understanding isoprene pathways HO2• dominated environments NOx levels continue decline US. This work underlines need for inclusion partitioning semivolatile atmospheric models.

Language: Английский

Citations

0