Dynamic Oxidative Potential of Organic Aerosol from Heated Cooking Oil

Wang, Shunyao; Takhar, Manpreet; Zhao, Yue; Rashdi, Loay Nasser Salim Al; Chan, Arthur W. H.

doi:10.1021/acsearthspacechem.1c00038

Cited by 18 publications

(20 citation statements)

References 104 publications

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“…Atmospheric aging could also affect PO abundance in aerosols. Enhanced PO content was observed in SOA from α-pinene, naphthalene, and cooking emissions during atmospheric photochemical aging. ,, …”

Section: Observations Of Pos In Laboratory and Field Studiesmentioning

confidence: 97%

Organic Peroxides in Aerosol: Key Reactive Intermediates for Multiphase Processes in the Atmosphere

et al. 2023

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Organic peroxides (POs) are organic molecules with one or more peroxide (−O−O−) functional groups. POs are commonly regarded as chemically labile termination products from gas-phase radical chemistry and therefore serve as temporary reservoirs for oxidative radicals (HO x and RO x ) in the atmosphere. Owing to their ubiquity, active gasparticle partitioning behavior, and reactivity, POs are key reactive intermediates in atmospheric multiphase processes determining the life cycle (formation, growth, and aging), climate, and health impacts of aerosol. However, there remain substantial gaps in the origin, molecular diversity, and fate of POs due to their complex nature and dynamic behavior. Here, we summarize the current understanding on atmospheric POs, with a focus on their identification and quantification, state-of-the-art analytical developments, molecular-level formation mechanisms, multiphase chemical transformation pathways, as well as environmental and health impacts. We find that interactions with SO 2 and transition metal ions are generally the fast PO transformation pathways in atmospheric liquid water, with lifetimes estimated to be minutes to hours, while hydrolysis is particularly important for α-substituted hydroperoxides. Meanwhile, photolysis and thermolysis are likely minor sinks for POs. These multiphase PO transformation pathways are distinctly different from their gas-phase fates, such as photolysis and reaction with OH radicals, which highlights the need to understand the multiphase partitioning of POs. By summarizing the current advances and remaining challenges for the investigation of POs, we propose future research priorities regarding their origin, fate, and impacts in the atmosphere.

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Section: Observations Of Pos In Laboratory and Field Studiesmentioning

confidence: 97%

Organic Peroxides in Aerosol: Key Reactive Intermediates for Multiphase Processes in the Atmosphere

et al. 2023

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“…This is in line with a very recent study showing that the total ROS production from cooking SOA can be enhanced substantially through atmospheric aging, coinciding with the elevation in peroxide contents. 59 Isoprene SOA is measured to have high peroxide content (∼97%) compared to Surratt et al 60 (∼61%, from a Teflon chamber); this difference may be due to excess RO 2 • chemistry in the PAM reactor, inducing more production of peroxides through termination steps such as RO 2…”

mentioning

confidence: 89%

Iron-Facilitated Organic Radical Formation from Secondary Organic Aerosols in Surrogate Lung Fluid

Wei

Fang

Lakey

et al. 2021

Environ. Sci. Technol.

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Respiratory deposition of secondary organic aerosols (SOA) and iron may lead to the generation of reactive oxygen species and free radicals in lung fluid to cause oxidative stress, but their underlying mechanism and formation kinetics are not well understood. Here we demonstrate substantial formation of organic radicals in surrogate lung fluid (SLF) by mixtures of Fe2+ and SOA generated from photooxidation of isoprene, α-terpineol, and toluene. The molar yields of organic radicals by SOA are measured to be 0.03–0.5% in SLF, which are 5–10 times higher than in water. We observe that Fe2+ enhances organic radical yields dramatically by a factor of 20–80, which can be attributed to Fe2+-facilitated decomposition of organic peroxides, in consistency with a positive correlation between peroxide contents and organic radical yields. Ascorbate mediates redox cycling of iron ions to sustain organic peroxide decomposition, as supported by kinetic modeling reproducing time- and concentration-dependence of organic radical formation as well as additional experiments observing the formation of Fe2+ and ascorbate radicals in mixtures of ascorbate and Fe3+. •OH and superoxide are found to be scavenged by antioxidants efficiently. These findings have implications on the role of organic radicals in oxidative damage and lipid peroxidation.

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“…114 Katragadda et al 115 have shown that emissions from cooking methods such as deep frying at temperatures above smoking point of an oil, can contain exceeding levels of OE. In the recent work of Wang et al, 48 iodometry was applied to quantify total peroxide content in primary organic aerosols emitted from heating of different edible oils. In this case, it is possible that the demonstrated OE interference can lead to inaccurate estimations of total peroxide content.…”

Section: Discussionmentioning

confidence: 99%

“…This is a standard method employed for measuring rancidity in oil and toxicity in lipids. , Despite the experimental variations between the PV method employed for lipid peroxides and iodometry for aerosol-bound peroxides, the principal chemistry is the same as outlined by reactions (1) and (2) in Scheme . Today, iodometry is still widely employed in a number of research fields, − with its recent applications including peroxide determination in vegetable oils, , lipid extracts from meat, − and outdoor and indoor environments. ,− …”

Section: Introductionmentioning

confidence: 99%

Potential Matrix Effects in Iodometry Determination of Peroxides Induced by Olefins

Gautam

et al. 2022

J. Phys. Chem. A

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Peroxides (H 2 O 2 , ROOR, and ROOH) are an important reaction intermediate involved in a number of natural processes, including atmospheric autoxidation and lipid peroxidation in oils and animal tissues. Iodometry is an established spectroscopic technique that has been widely used to quantify total peroxide concentration in food, indoor, and outdoor samples. Iodometry provides selectivity toward peroxides through a quantitative reaction between I − and peroxides to form I 3 − via a molecular iodine (I 2 ) intermediate. However, equilibrium changes caused by a potential interaction between olefinic species and I 2 can suppress I 3 − formation, thereby underestimating peroxide concentration. For the first time in the current study, this unrecognized interference posed by olefins (OEs) is systematically investigated to gauge its effects on the accuracy of iodometry. A number of model molecules were investigated. The interference was observed to be unique to OEs, but universally affecting different peroxide species such as H 2 O 2 , tert-butyl hydroperoxide, and aerosol-bound peroxides. A simple kinetic box model was built to explain this chemistry. The measured rate constant for 3-octenoic acid was found to be 0.84 ± 0.02 M −1 s −1 . Overall, our results show matrix effects induced by OEs can underestimate peroxide concentration determined by iodometry for edible oils, indoor environments, and animal fat, but absent in most of the atmospheric samples. Nonetheless, our results point out the importance of this interfering chemistry in matrices enriched with OEs.

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Dynamic Oxidative Potential of Organic Aerosol from Heated Cooking Oil

Cited by 18 publications

References 104 publications

Organic Peroxides in Aerosol: Key Reactive Intermediates for Multiphase Processes in the Atmosphere

Organic Peroxides in Aerosol: Key Reactive Intermediates for Multiphase Processes in the Atmosphere

Iron-Facilitated Organic Radical Formation from Secondary Organic Aerosols in Surrogate Lung Fluid

Potential Matrix Effects in Iodometry Determination of Peroxides Induced by Olefins

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