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Chinese Journal of Applied Ecology ›› 2020, Vol. 31 ›› Issue (5): 1753-1762.doi: 10.13287/j.1001-9332.202005.021

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Compound-specific carbon and nitrogen isotope analysis of amino sugars and their applications

GUO Jin-qiang1,2,3,4, YUAN Hua-mao1,2,3,4*, SONG Jin-ming1,2,3,4, LI Xue-gang1,2,3,4, LI Ning1,2,3,4, DUAN Li-qin1,2,3,4   

  1. 1Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, Shandong, China;
    2Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, Shandong, China;
    3University of Chinese Academy of Sciences, Beijing 100049, China;
    4Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, Shandong, China
  • Received:2019-10-30 Online:2020-05-15 Published:2020-05-15
  • Contact: * E-mail: yuanhuamao@qdio.ac.cn
  • Supported by:
    This work was supported by the Key Science and Technology Innovation Program of Shandong Province (2018SDKJ0504-1), and the Strategic Priority Research Program of the Chinese Aca-demy of Sciences (XDA23050501).

Abstract: Amino sugars (AS) are one of the important biochemical components in the natural organic matter pool. Clarifying the sources and transformations of AS would facilitate our understan-ding of the microbial regulation of organic matter. As an emerging technology, compound-specific isotope analysis of amino sugars (CSIA-AS) provides more detailed dynamic information of indivi-dual AS in natural environment. Here, we systematically summarized the determination methods of CSIA-AS and gave an overview on innovative applications in the cycling of AS. CSIA-AS can be performed by gas chromatography-isotope ratio mass spectrometry (GC-IRMS) and ion chromatography-isotope ratio mass spectrometry (IC-IRMS). Each method has its own advantages and disadvantages, but reliable results can be achieved after calibration. The mean residence time of AS is relatively low in soil organic matter, and the bacterial-derived muramic acid possesses a higher minera-lization rate than glucosamine, galactosamine, and mannosamine. The source and metabolic transformation of AS are affected by the substrate, which is related to the specific response of microbial community to different carbon and nitrogen sources. The promotion of CSIA-AS technology requires further optimization of method and integration with other approaches such as microbial screening to decipher the source, transformation, fate and regulatory mechanisms of organic matter.

Key words: compound-specific isotope analysis of amino sugars, organic matter, turnover, mine-ralization, metabolic transformation