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驴乳酸奶冷藏期间挥发性风味物质成分分析 被引量:4
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作者 苟小刚 杨行 +2 位作者 张明 周玉贵 王玉涛 《食品安全质量检测学报》 CAS 北大核心 2022年第2期585-592,共8页
目的分析驴乳酸奶挥发性风味物质在冷藏期间的构成及含量变化。方法采用顶空固相微萃取(headspace solid-phase microextraction,HS-SPME)结合气相色谱-质谱法(gas chromatography-mass spectrometry,GC-MS),研究新疆传统乳酸菌发酵驴... 目的分析驴乳酸奶挥发性风味物质在冷藏期间的构成及含量变化。方法采用顶空固相微萃取(headspace solid-phase microextraction,HS-SPME)结合气相色谱-质谱法(gas chromatography-mass spectrometry,GC-MS),研究新疆传统乳酸菌发酵驴乳酸奶冷藏第7、14、21 d的挥发性风味物质的种类和含量变化。结果在4℃条件下冷藏的驴乳酸奶中共检测出挥发性风味物质69种,主要包括17种酸类、15种醇类、12种酮类、9种芳香杂环类化合物、4种脂类、5种烷烃类、2种醛类、1种胺类、1种萜烯类和3种含硫化合物;冷藏第7、14、21 d分别检测出35种、39种、38种化合物。其中,乙酸、丁酸、己酸、辛酸和3-羟基-2-丁酮相对含量较高。结论随着冷藏时间的增加,驴乳酸奶中所含挥发性风味物质的相对含量也发生着相应的变化。 展开更多
关键词 驴乳酸奶 顶空固相微萃取 气相色谱-质谱法 挥发性风味物质
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Quantitative analysis of Boehm' s GC 被引量:2
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作者 GUAN Xue-tao ZHANG Yuan-rui +1 位作者 gou xiao-gang CHENG Xu 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2003年第3期259-264,共6页
The term garbage collection describes the automated process of finding previously allocated memorythatis no longer in use in order to make the memory available to satisfy subsequent allocation requests. Wehave reviewe... The term garbage collection describes the automated process of finding previously allocated memorythatis no longer in use in order to make the memory available to satisfy subsequent allocation requests. Wehave reviewed existing papers and implementations of GC, and especially analyzed Boehm' s C codes, which isa real-time mark-sweep GC running under Linux and ANSI C standard. In this paper, we will quantitatively an-alyze the performance of different configurations of Boehm' s collector subjected to different workloads. Reportedmeasurements demonstrate that a refined garbage collector is a viable alternative to traditional explicit memorymanagement techniques, even for low-level languages. It is more a trade-off for certain system than an all-or-nothing proposition. 展开更多
关键词 CONSERVATIVE garbage collection INCREMENTAL mark-sweep REAL-TIME
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