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Analysis of amino acid enantiomers in ambient aerosols: Effects and removal of coexistent aerosol matrix

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اقرأ أكثر حفظ في قائمتي
  • المؤلفون: Li, Ying; Li, Xiaoying; Wu, Libin; Shi, Luhan; Wang, Shan; Fu, Pingqing; Zhang, Yingyi; Lai, Senchao
  • نوع التسجيلة:
    Electronic Resource
  • الدخول الالكتروني :
    http://repository.hkust.edu.hk/ir/Record/1783.1-126465
    https://doi.org/10.1016/j.jes.2023.02.048
    http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=1001-0742&rft.volume=137&rft.issue=&rft.date=2024&rft.spage=732&rft.aulast=Li&rft.aufirst=Y.&rft.atitle=Analysis+of+amino+acid+enantiomers+in+ambient+aerosols%3A+Effects+and+removal+of+coexistent+aerosol+matrix&rft.title=Journal+of+Environmental+Sciences+%28China%29
    http://www.scopus.com/record/display.url?eid=2-s2.0-85151673953&origin=inward
    http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=001146165700001
  • معلومة اضافية
    • Publisher Information:
      Elsevier B.V. 2024
    • نبذة مختصرة :
      Amino acids (AAs) including D- and L- enantiomers are a group of organic nitrogen species in ambient aerosol. Due to the low abundances of AAs (level of ng/m3) and the matrix effects by coexistent components, it is challenging to quantify AA enantiomers in ambient aerosols especially under pollution conditions. In this study, we present an optimized method for analyzing AA enantiomers in atmospheric aerosol samples including a pretreatment process and the detection by high performance liquid chromatography coupled to a fluorescence detector (HPLC-FLD). Matrix effects caused by coexistent chemicals on AA enantiomers analysis in ambient aerosol samples were investigated especially for those collected in pollution episodes. The results revealed that the determination of AA enantiomers is significantly affected by the coexistent organic carbon (as a proxy of organic matter) and water-soluble ion of NH4+. To remove the matrix effects, we applied a pretreatment using the solid phase extraction column coupled with alkaline adjustment to sample extract. After pretreatment, 18 AAs including 6 pairs of D- and L-enantiomers (i.e., leucine, isoleucine, valine, alanine, serine, and aspartic acid) can be successfully separated and quantified in aerosol samples by HPLC-FLD. The recoveries are in the range of 67%-106%. This method was successfully applied to the urban aerosol samples from pollution and non-pollution periods for AA enantiomers determination. We suggest that the concentrations of D-AAs and the ratio of D-AA/L-AA are indicative of the contribution of bacterial sources and the influence of biomass burning. © 2023
    • الموضوع:
      Amino acid enantiomers; Ammonia; Atmospheric aerosol; Chiral ratio; Organic carbon; Article
    • Availability:
      Open access content. Open access content
    • Note:
      English
    • Other Numbers:
      HNK oai:repository.hkust.edu.hk:1783.1-126465
      Journal of Environmental Sciences, v. 137, March 2024, p. 732-740
      1001-0742
      1878-7320
      1383746704
    • Contributing Source:
      HONG KONG UNIV OF SCI & TECH, THE
      From OAIster®, provided by the OCLC Cooperative.
    • الرقم المعرف:
      edsoai.on1383746704
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