Carbon isotopic studies of individual lipids in organisms from the Nansha sea area, China  

作　　者：DUAN Yi SONG Jinming ZHANG Hui 

机构地区：[1]Lanzhou Institute of Geology,Chinese Academy of Sciences,Lanzhou 730000,China [2]School of Geology,Lanzhou University,Lanzhou 730000,China [3]Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China

出　　处：《Science China Earth Sciences》2004年第7期593-598,共6页中国科学（地球科学英文版）

基　　金：This work was supported by the National Natural Science Foundation of China (Grant No. 40072040); the Important Direction Project of Knowledge Innovation in Resource and Environment Field, Chinese Academy of Sciences (Grant No. KZCX3-SW-128); the National Outstanding Youth Science Foundation of China(Grant No. 40072040).

摘　　要：Carbon isotopes of individual lipids in typical organisms from the Nansha sea area were measured by the GC-IRMS analytical technique. δ13C values of saturated fatty acids in different organisms examined are from 25.6‰ to 29.7‰ with the average values ranging from 26.4‰ to 28.2‰ and the variance range of 1.8‰ between different organisms is also observed. Unsaturated fatty acids have heavy carbon isotopic compositions and the mean differences of 2.9‰–6.8‰ compared to the same carbon number saturated fatty acids. δ13C values of n-alkanes range from 27.5‰ to 29.7‰ and their mean values, ranging from 28.6‰ to 28.9‰, are very close in different organisms. The mean difference in δ13C between the saturated fatty acids and n-alkanes is only 1.5‰, indicating that they have similar biosynthetic pathways. The carbon isotopic variations between the different carbon-number lipids are mostly within ±2.0‰, reflecting that they experienced a biosynthetic process of the carbon chain elongation. At the same time, the carbon isotopic genetic relationships between the biological and sedimentary lipids are established by comparative studies of carbon isotopic compositions of individual lipids in organisms and sediments from the Nansha sea area, which provides scientific basis for carbon isotopic applied research of individual lipids.Carbon isotopes of individual lipids in typical organisms from the Nansha sea area were measured by the GC-IRMS analytical technique. d 13C values of saturated fatty acids in different organisms examined are from -25.6 to -29.7 with the average values ranging from -26.4 to -28.2 and the variance range of 1.8 between different organisms is also observed. Unsaturated fatty acids have heavy carbon isotopic compositions and the mean differences of 2.9—6.8 compared to the same carbon number saturated fatty acids. d 13C values of n-alkanes range from -27.5 to -29.7 and their mean values, ranging from -28.6 to -28.9, are very close in different organisms. The mean difference in d 13C between the satu-rated fatty acids and n-alkanes is only 1.5, indicating that they have similar biosynthetic path-ways. The carbon isotopic variations between the different carbon-number lipids are mostly within 2.0, reflecting that they experienced a biosynthetic process of the carbon chain elon-gation. At the same time, the carbon isotopic genetic relationships between the biological and sedimentary lipids are established by comparative studies of carbon isotopic compositions of individual lipids in organisms and sediments from the Nansha sea area, which provides scientific basis for carbon isotopic applied research of individual lipids.

关 键 词：marine organisms individual lipids carbon isotopic compositions genetic relationships DOI: 10.1360/03yd0561 

分 类 号：P734[天文地球—海洋化学]