Trace Level Detection of Putrescine and Cadaverine in Food Samples Using a Novel Rhodanine-Imidazole Dyad and Evaluation of its Biological Properties

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 480, P. 136445 - 136445

Published: Nov. 9, 2024

Language: Английский

---

Amino Acid and Amine Compounds in Fine Aerosol Particles: A Review of Determination Methods, Abundances, Origins, and Atmospheric Processes

Aerosol Science and Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: March 6, 2025

Language: Английский

---

Oxidative Degradation of Higher-Molecular-Weight Aromatic Amine Compounds Is a Potential Source of Anilinium in Urban Aerosols

Environmental Science & Technology Letters, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 28, 2024

Aminiums are significant components of organic aerosols with intense research on aliphatic aminiums. However, the mechanisms formation aromatic aminiums in urban remain elusive. Highly time-resolved PM2.5 samples were collected center Shanghai (China) during winter to investigate origin and The dominant aminium groups (mainly dimethylaminium monomethylaminium). Anilinium was third most abundant aminium. concentrations anilinium total showed higher levels daytime weekdays. This finding combined source apportionment analysis suggested that daily weekly scale variations anthropogenic activities (e.g., traffic for commuting) mainly responsible fluctuations (particularly aminiums). acid dependence significantly stronger than formation. Aliphatic negatively positively correlated ozone, respectively, suggesting oxidative processes weakened abundance but promoted molecular characterization atmospheric degradation higher-molecular-weight amine compounds an important mechanism aerosols. Thus, this study provides novel insights into

Language: Английский

---

Optimization and validation of a liquid chromatography method with fluorescence detection for the determination of amines in fine atmospheric particulate matter

Caderno Pedagógico, Journal Year: 2024, Volume and Issue: 21(8), P. e6484 - e6484

Published: Aug. 7, 2024

Primary amines are pollutants present in the atmosphere gaseous form or as particulate matter, emitted mainly by industrial sector, vehicles, and biomass burning. There is concern about concentration of atmosphere, consequences long-term exposure cannot be predicted. The objective study optimization subsequent validation a method for determining fine atmospheric using liquid chromatography fluorescence detection. derivatization process was carried out through 2² factorial design to improve sensitivity method, that lower concentrations reagents o-phthaldialdehyde 2-mercaptoethanol result more pronounced analytical signal. chromatographic allowed separation four primary within 20 minutes run time solvents such sodium acetate, methanol tetrahydrofuran. showed good performance according results selectivity linearity, with detection limits 0.121 0.284 ng m-³ quantification 0.398 0.938 m-³. precision (>5%) recoveries (82 117%) recommended values. Therefore, optimized application real samples amines, obtaining Brazil comparable other regions around world.

Language: Английский

---

Dominant influence of biomass combustion and cross-border transport on nitrogen-containing organic compound levels in the southeastern Tibetan Plateau

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(19), P. 11175 - 11189

Published: Oct. 7, 2024

Abstract. The Tibetan Plateau (TP) is highly susceptible to climate change, and nitrogen-containing organic compounds (NOCs) in fine particulate matter (PM2.5) represent one of the largest uncertainties with respect their impact on high-altitude areas. Previous studies have shown that NOCs play a vital role nitrogen budget PM2.5. However, our understanding composition sources PM2.5, particularly TP, limited. Here, we aim enhance TP region by examining identification, concentration levels, sources, origins. We conducted field sampling at regional background site Gaomeigu, southeastern margin from 11 March 13 May 2017, followed laboratory analysis collected filters. daily mass concentrations ranged 714.4 3887.1 ng m−3, an average 2119.4 ± 875.0 m−3 during campaign. This was approximately 40 % higher than reported typical North China Plain (NCP), highlighting more significant presence area. Biomass burning secondary were identified as major contributors total NOCs. further substantiated air quality model, which indicated over 80 aerosol southeast originated neighboring countries. study improves NOCs' contribution PM2.5 potential impacts stability

Language: Английский

---

Quantification of dimethylamine in low concentration particulate matter by reducing the concentration of 9-fluorenylmethyl chloroformate

Analytical Methods, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 22, 2024

This study measures trace levels of dimethylamine in ambient air particulate matter by reducing the concentration 9-fluorenylmethyl chloroformate. miniaturized method used is cleaner, simpler, and faster for routine monitoring.

Language: Английский

---