Cross Photoreaction of Glyoxylic and Pyruvic Acids
in Model Aqueous Aerosol
Version 2 2019-07-12, 08:14
Version 1 2018-07-25, 15:22
Posted on 2019-07-12 - 08:14
Aerosols of variable
composition, size, and shape are associated
with public health concerns as well as with light-particle interactions
that play a role in the energy balance of the atmosphere. Photochemical
reactions of 2-oxocarboxylic acids in the aqueous phase are now known
to contribute to the total secondary organic aerosol (SOA) budget.
This work explores the cross reaction of glyoxylic acid (GA) and pyruvic
acid (PA) in water, the two most abundant 2-oxocarboxylic acids in
the atmosphere, under solar irradiation and dark thermal aging steps.
During irradiation, PA and GA are excited and initiate proton-coupled
electron transfer or hydrogen abstraction and α-cleavage reactions,
respectively. The time series of photoproducts is studied by ion chromatography
(IC) with conductivity and electrospray ionization (ESI) mass spectrometry
(MS) detection, direct ESI-MS analysis in the negative ion mode, and
nuclear magnetic resonance spectroscopy (NMR). The use of one-dimensional
(1H and 13C NMR) and two-dimensional NMR techniques
includes gradient correlation spectroscopy (gCOSY) and heteronuclear
single quantum correlation (HSQC). The aging of photoproducts in the
dark is monitored by UV–visible spectroscopy. The periodicity
in the time domain of the optical properties is explained in terms
of chromophores that undergo alternating thermochromism and photobleaching
between nighttime and daytime cycles, respectively. A reaction mechanism
for the cross reaction of GA and PA explaining the generation of trimers
with general formulas C5H8O5 (148
Da), C6H10O5 (162 Da), and C5H8O6 (164 Da) is provided based on all
experimental observations.
CITE THIS COLLECTION
DataCite
3 Biotech
3D Printing in Medicine
3D Research
3D-Printed Materials and Systems
4OR
AAPG Bulletin
AAPS Open
AAPS PharmSciTech
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg
ABI Technik (German)
Academic Medicine
Academic Pediatrics
Academic Psychiatry
Academic Questions
Academy of Management Discoveries
Academy of Management Journal
Academy of Management Learning and Education
Academy of Management Perspectives
Academy of Management Proceedings
Academy of Management Review
Xia, Sha-Sha; Eugene, Alexis J.; Guzman, Marcelo I. (2018). Cross Photoreaction of Glyoxylic and Pyruvic Acids
in Model Aqueous Aerosol. ACS Publications. Collection. https://doi.org/10.1021/acs.jpca.8b05724
or
Select your citation style and then place your mouse over the citation text to select it.
SHARE
Usage metrics
Read the peer-reviewed publication
AUTHORS (3)
SX
Sha-Sha Xia
AE
Alexis J. Eugene
MG
Marcelo I. Guzman
KEYWORDS
atmosphereenergy balanceGAirradiationPyruvic Acidsglyoxylic acidModel Aqueous Aerosol Aerosolsmass spectrometrylight-particle interactionsPAhydrogen abstraction2- oxocarboxylic acidsgradient correlation spectroscopyHSQCion chromatographyUVreaction mechanismtime seriestime domainproton-coupled electron transferphotoproductresonance spectroscopyquantum correlation1 Hpyruvic acidPhotochemical reactionsCross Photoreactionelectrospray ionizationSOAion mode13 C NMRDaICα- cleavage reactionsNMR techniquesESI-MS analysishealth concerns