The kinetics of the simplest Criegee intermediate (CHOO) reaction with -butylamine ((CH)CNH) was studied under pseudo-first-order conditions with the OH laser-induced fluorescence (LIF) method at the temperature range of 283-318 K and the pressure range of 5-75 Torr. Our pressure-dependent measurement showed that at 5 Torr─the lowest pressure measured in the current experiment─this reaction was under the high-pressure limit condition. At 298 K, the reaction rate coefficient was measured to be (4.95 ± 0.64) × 10 cm molecule s. The title reaction was observed to be negative temperature-dependent; the activation energy of (-2.82 ± 0.37) kcal mol and the pre-exponential factor of (4.21 ± 0.55) × 10 cm molecule s were derived from the Arrhenius equation. The rate coefficient of the title reaction is slightly larger than (4.3 ± 0.5) × 10 cm molecule s of the CHOO reaction with methylamine; the electron inductive effect and the steric hindrance effect might play a role in contributing to such difference.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/acs.jpca.2c07854 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Co-Designing a Consumer-Focused Digital Reporting Health Platform to Improve Adverse Medicine Event Reporting: Protocol for a Multimethod Research Project (the ReMedi Project).
JMIR Res Protoc
January 2025
Quality Use of Medicines and Pharmacy Research Centre, UniSA Clinical and Health Sciences, University of South Australia, Adelaide, Australia.
Background: Adverse medicine events (AMEs) are unintended effects that occur following administration of medicines. Up to 70% of AMEs are not reported to, and hence remain undetected by, health care professionals and only 6% of AMEs are reported to regulators. Increased reporting by consumers, health care professionals, and pharmaceutical companies to medicine regulatory authorities is needed to increase the safety of medicines.
View Article and Find Full Text PDFTheoretical Study of Antioxidant and Prooxidant Potency of Protocatechuic Aldehyde.
Int J Mol Sci
January 2025
Institute for Information Technologies Kragujevac, Department of Science, University of Kragujevac, Jovana Cvijića bb, 34000 Kragujevac, Serbia.
In this study, the antioxidant and prooxidant potency of protocatechuic aldehyde (PCA) was evaluated using density functional theory (DFT). The potency of direct scavenging of hydroperoxyl (HOO) and lipid peroxyl radicals (modeled by vinyl peroxyl, HC=CHOO) involved in lipid peroxidation was estimated. The repair of oxidative damage in biomolecules (lipids, proteins and nucleic acids) and the prooxidant ability of PCA phenoxyl radicals were considered.
View Article and Find Full Text PDFDetermining Rate Coefficients for the 11-Atom Reaction via Ring Polymer Molecular Dynamics Based on a 27-Dimensional Potential Energy Surface: The Reaction between -CHCHOO and HO.
J Phys Chem Lett
January 2025
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
Criegee intermediates (CIs) are potentially significant oxidants and a major source of OH radicals in the troposphere. The -CHCHOO intermediate has been confirmed as a crucial component of CIs in the atmospheric environment. Although previous studies have provided some experimental and theoretical rate constants, inconsistencies among these data remain, and the experimental data do not cover the full range of temperatures present in the troposphere.
View Article and Find Full Text PDFCRISPR/HCR-powered ratiometric fluorescence aptasensor for ochratoxin A detection.
Food Chem
March 2025
Coastal Zone Ecological Environment Monitoring Technology and Equipment Shandong Engineering Research Center, CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Research Centre for Coastal Environmental Engineering and Technology, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China. Electronic address:
To address the need for highly sensitive and reliable detection of trace ochratoxin A (OTA) in food matrices, we developed a ratiometric fluorescent aptasensor by integrating CRISPR/Cas12a, hybridization chain reaction (HCR), and horseradish peroxidase (HRP)-induced inner filter effect (IFE). The mechanism involves OTA releasing an activator that initiates CRISPR/Cas12a trans-cleavage, blocking HCR assembly. This reduces HRP levels, limiting the conversion of o-phenylenediamine (OPD) to fluorescent 2,3-diaminophenazine (DAP) (emitting at 562 nm) while maintaining strong emission from 2-amino terephthalic acid (BDC-NH) at 426 nm.
View Article and Find Full Text PDFViral reactivation and clinical outcomes in Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS).
Sci Rep
November 2024
Duke-NUS Medical School, Singapore, Singapore.
Drug reaction with eosinophilia and systemic symptoms (DRESS) is a rare severe cutaneous adverse drug reaction associated with multi-organ involvement and long-term sequelae. Human herpesviridae species reactivation has been observed, however, risk factors for reactivation and its impact on the clinical course and outcomes is unclear. We aimed to explore the impact of viral reactivation on DRESS on clinical outcomes and to identify potential risk factors for reactivation.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!