HS-SPME-GC-MS结合ROAV法对市售核桃油香气成分的研究

采用顶空固相微萃(HS-SPME)结合气相色谱-质谱(GC-MS)联用技术对市售核桃油挥发性香气成分进行鉴定分析,共鉴定出76种香气组分。主要为醛类21种(53.46%)、醇类9种(18.60%)、酮类10种(7.32%)、酸类4种(6.38%)、烯烃类6种(2.90%)、烷烃类9种(2.54%)、酯类12种(2.28%)以及杂环类5种(2.17%)。采用相对香气活度值(ROAV)法对市售核桃油挥发性香气成分进行分析,在市售核桃油挥发性香气成分中共有9种关键挥发性香气成分,分别为(E,E)-2,4-癸二烯醛、1-辛烯-3-醇、己醛、壬醛、2-辛烯醛、辛醛、(E)-2-癸烯醛、(E)-2-庚烯醛、2-戊基呋喃,这些物质为市售核桃油的整体香味起到了主要的贡献作用。

基准柴油与市售柴油对船用柴油机排放影响

船用柴油机按GB15097-2016中恆速五工况(D2循环)用基准柴油与市售柴油分别进行排放测试,对比在10%、25%、50%、75%和100%负荷下,柴油机CO、HC、NOx和PM排放变化趋勞及差异,研究分析了测试用油对排放量餉形响,为柴油机排放测试选择用油提供参考。

Analysis on Competitiveness of China's Refineries

The paper reviewed the refining and marketing business of both domestic and international oil companies, and tried to figure out the gap of domestic refining enterprises in terms of the refinery scale, processing unil configuration, stream factor and competitive edge as compared to overseas refineries. The paper also concluded that the net margin of domestic refineries is about $ 1.0/bbl lower than that of the overseas refineries, and proposed some ideas to sharpen the competitive edge of Chinese refining industry.