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Laboratory Chemical Characterization...

Bahdanovich, Palina,

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Laboratory Chemical Characterization of Fresh and Aged Bioaerosols /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Laboratory Chemical Characterization of Fresh and Aged Bioaerosols // Palina Bahdanovich.
作者:	Bahdanovich, Palina,
面頁冊數:	1 electronic resource (142 pages)
附註:	Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
Contained By:	Dissertations Abstracts International87-01B.
標題:	Atmospheric chemistry. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31994665
ISBN:	9798286452149

Laboratory Chemical Characterization of Fresh and Aged Bioaerosols /
Bahdanovich, Palina,

Laboratory Chemical Characterization of Fresh and Aged Bioaerosols /Palina Bahdanovich. - 1 electronic resource (142 pages)

Source: Dissertations Abstracts International, Volume: 87-01, Section: B.

Bioaerosols are biological aerosol particles in the atmosphere, such as pollen, fungi, algae, and bacteria, with sizes ranging from a few nanometers to hundreds of micrometers. The importance of bioaerosols has been growing due to climate change, however, their chemistry and atmospheric fate are still largely unexplored. The contribution of bioaerosols and their organic compounds to the atmospheric organic carbon load, and their role in cloud physics and atmospheric processes should be studied further. To address this knowledge gap, this dissertation investigates the chemical composition of water-soluble extracts of various types of bioaerosols and the effects of laboratory aging, such as exposure to simulated solar radiation and OH radicals. The bioaerosols chosen for chemical characterization were lodgepole pine pollen, rabbitbrush pollen, western gall rust fungi, hay Bacillus bacteria, Pedobacter bacteria, and Spirulina alga. Using various analytical techniques, such as gas chromatography - mass spectrometry (GC-MS), ultra-high performance liquid chromatography - mass spectrometry (UPLC-MS), ultraviolet-visible-near-infrared spectrophotometry (UV-Vis-NIR), proton nuclear magnetic resonance spectroscopy (1H-NMR), and Fourier-transform infrared spectroscopy (FTIR), organic species (saccharides, amino acids, and fatty acids) and functional groups of these bioaerosols were determined. Chemical analysis showed that the saccharide glucose was common between all analyzed bioaerosol extracts, and the major contribution of organic species in pollen was from saccharides. Laboratory aging was performed on lodgepole pine pollen and Spirulina alga using the Suntest CPS solar simulator. These bioaerosols were exposed to (1) simulated solar radiation, ranging from 300 to 800 nanometers, and (2) OH radicals formed by hydrogen peroxide through photolysis. Functional groups were compared before and after aging using 1H-NMR and FTIR spectroscopy to uncover the chemical transformation and changes in polarity of the bioaerosols. FTIR results showed an overall increase of polar functional groups in the two bioaerosols after aging with simulated solar radiation. Though 1H-NMR showed no significant changes after simulated solar aging, the functional group distribution transformed dramatically after exposure to OH radicals. In summary, this research was instrumental in understanding the contribution of various organic compounds to bioaerosol chemistry and the transformation of bioaerosols after exposure to atmospheric aging.

English

ISBN: 9798286452149Subjects--Topical Terms:

544140
Atmospheric chemistry.
Subjects--Index Terms:

Bioaerosols

Laboratory Chemical Characterization of Fresh and Aged Bioaerosols /
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520 $a Bioaerosols are biological aerosol particles in the atmosphere, such as pollen, fungi, algae, and bacteria, with sizes ranging from a few nanometers to hundreds of micrometers. The importance of bioaerosols has been growing due to climate change, however, their chemistry and atmospheric fate are still largely unexplored. The contribution of bioaerosols and their organic compounds to the atmospheric organic carbon load, and their role in cloud physics and atmospheric processes should be studied further. To address this knowledge gap, this dissertation investigates the chemical composition of water-soluble extracts of various types of bioaerosols and the effects of laboratory aging, such as exposure to simulated solar radiation and OH radicals. The bioaerosols chosen for chemical characterization were lodgepole pine pollen, rabbitbrush pollen, western gall rust fungi, hay Bacillus bacteria, Pedobacter bacteria, and Spirulina alga. Using various analytical techniques, such as gas chromatography - mass spectrometry (GC-MS), ultra-high performance liquid chromatography - mass spectrometry (UPLC-MS), ultraviolet-visible-near-infrared spectrophotometry (UV-Vis-NIR), proton nuclear magnetic resonance spectroscopy (1H-NMR), and Fourier-transform infrared spectroscopy (FTIR), organic species (saccharides, amino acids, and fatty acids) and functional groups of these bioaerosols were determined. Chemical analysis showed that the saccharide glucose was common between all analyzed bioaerosol extracts, and the major contribution of organic species in pollen was from saccharides. Laboratory aging was performed on lodgepole pine pollen and Spirulina alga using the Suntest CPS solar simulator. These bioaerosols were exposed to (1) simulated solar radiation, ranging from 300 to 800 nanometers, and (2) OH radicals formed by hydrogen peroxide through photolysis. Functional groups were compared before and after aging using 1H-NMR and FTIR spectroscopy to uncover the chemical transformation and changes in polarity of the bioaerosols. FTIR results showed an overall increase of polar functional groups in the two bioaerosols after aging with simulated solar radiation. Though 1H-NMR showed no significant changes after simulated solar aging, the functional group distribution transformed dramatically after exposure to OH radicals. In summary, this research was instrumental in understanding the contribution of various organic compounds to bioaerosol chemistry and the transformation of bioaerosols after exposure to atmospheric aging.
546 $a English
590 $a School code: 0139
650 4 $a Atmospheric chemistry. $3 544140
650 4 $a Analytical chemistry. $3 3168300
650 4 $a Aging. $3 543123
653 $a Bioaerosols
653 $a Chemical composition
653 $a Mass spectrometry
653 $a Magnetic resonance spectroscopy
653 $a Liquid chromatography
690 $a 0371
690 $a 0486
690 $a 0493
710 2 $a University of Nevada, Reno. $b Atmospheric Sciences. $e degree granting institution. $3 3825001
720 1 $a Samburova, Vera $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 87-01B.
790 $a 0139
791 $a Ph.D.
792 $a 2025
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