查询词典 headspace

Firstly, headspace solid-phase microextraction was established to determine AITC by orthogonal design. Extraction temperature, stir speed, extraction time, and desorption time were set at 40℃, 900r/min, 30min, and 5min, respectively. Under these optimal conditions, volatile flavor compounds in mustard oil, wasabi, and 'Chongcai'leaf mustard product were identified by SPME/GC/MS. In these three samples, 6,12,17 constituents were identified respectively; Allyl isothiocyanate was the main flavor compound, which accounted for 73.45%, 64.25%, 32.74% of total volatile compounds, respectively. Carbon disulfide, a hydrolysis product of AITC, accounted for 14.37% 25.40%, 51.67% of total volatile compounds respectively. There were some other isothiocycannates, such as butane, 1-isothiocyanato-, isobutyl isothiocyanate, 1-benzene, 4-isothiocyanato-, benzene (2-isothiocyanatoethyl)-, etc.

首先采用正交实验设计优化固相微萃取技术的前处理条件，结果表明，以萃取温度40℃、搅拌速度900r／min、萃取时间30min、解吸时间5min为最佳条件；在此最优条件基础上，利用SPME／GC／MS联用技术分析芥末油、青芥辣、冲菜的挥发性风味成分，分别检出6、12、17种化合物，主要风味物质均为AITC，相对丰度分别为73.45％、64.25％、32.74％；AITC的水解产物二硫化碳的相对丰度分别为14.37％、25.40％、51.67％；还检测到了其它几种异硫氰酸酯，如异硫氰酸丁酯、异硫氰酸异丁酯、异硫氰酸丁烯酯、2-苯乙基异硫氰酸酯等。

Results:The results indicated that the recovery rates of benzene in mineral water,soda drink,fruit juice,and almond milk were 97.57%,77.75%,86.82%,and 30.01% by headspace-extraction,respectively.

在食品工业中，苯是不允许用作食品添加剂，但由于各种污染源的存在，目前已有在饮料中检出了苯残留的报道[1]。

The carrier gas is nitrogen, headspace plate temperature is 70℃.

方法使用配置顶空进样的气相色谱仪，以水为溶剂，色谱柱为 Agilent DB-624毛细管色谱柱（6%氰丙基苯基-94%二甲基聚硅氧烷），柱温：40℃，保持 12min ，以30℃· min-1 的速度升温至100℃，保持 5min ，再以40℃· min-1 的速度升温至240℃，保持 5min ；以氮气为载气，柱流速0.7mL · min-1 ；氢火焰离子化检测器；顶空加热盘温度70℃。

Headspace GC is used for the analysis of volatiles and semi-volatile organics in solid, liquid and gas samples.

气相色谱顶空是用于挥发性和半挥发性有机物分析固体，液体及气体样本。

The fruit aromatic components in Owari satsuma, Jincheng sweet orange and acid orange were analyzed by headspace solid phase microextraction combined with GC-MS.

采用顶空固相微萃取-气质联用技术对大叶尾张温州蜜柑、锦橙和酸橙3种柑橘果实的香气成分进行分析测定。

The volatile compositions in liquid CO2 hop extract or compressed hop of homemade SA-1 hop were analyzed by headspace so- lid-phase micro extraction. Multiple indexes including total resin, soft resin, hard resin,α-acid,β-acid, and polyphenols in SA-1 hop were measured and then the parameters of SA-1 influencing beer brewing were compared with foreign quality hop SAAZ.

采用顶空固相微萃取方法对国产香型啤酒花品种札一的压缩花和液态CO2浸膏中的挥发性成分进行了分析，并测定了该啤酒花品种的总树脂、软树脂、硬树脂、α-酸、β-酸和啤酒花多酚等多项指标，并与国外优质香型花SAAZ的各项影响酿造性能的参数进行了比较。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。