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以二氯甲烷为萃取剂,采用气相色谱-质谱方法(GC-MS)测定郎酒的主香成分。通过GC-MS条件优化,得到较好的分离图谱,结合NIST质谱图库对各成分进行鉴定,并应用归一化法测定各成分的相对含量。共鉴定出40种微量成分,相对含量较高的有己酸乙酯、己酸、乳酸乙酯、乙酸和丁酸等。 相似文献
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气质色谱法测定发酵肉风味物质的研究 总被引:2,自引:0,他引:2
采用固相微萃取(SPME)提取风味成分,然后通过气相色谱一质谱联用法(GC—MS))对发酵肉中挥发性成分进行分离鉴定。结果表明,发酵肉制品中的主要风味物质有醛、醇、酯、酸、酮等。 相似文献
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核桃果实各部位脂肪酸的组成与含量分析 总被引:3,自引:0,他引:3
为评价核桃的营养价值并探讨核桃果实各部位的脂肪酸组成结构,通过气相色谱/质谱联用技术(GC/MS)对桃核各部位(核壳、核仁、种皮及青果皮)的脂肪酸成分进行比较分析,鉴定出亚油酸、亚麻酸、棕榈酸、硬脂酸、油酸等14种脂肪酸成分及其在核桃各部分中的相对含量。分析了桃核各组成部分中不饱和脂肪酸与饱和脂肪酸所占比例及营养价值。 相似文献
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全氟辛基磺酸(PFOS)很难通过常规方法从纺织品中分离、检出.采用超声-微波协同萃取仪提取样品中的PFOS,以四丁基氢氧化铵(TBAH)为衍生化试剂,与PFOS形成铵盐,再在柱上进行衍生化反应,形成PFOS丁酯,进而被气相色谱/质谱(GC/MS)联用仪检出.通过探索最佳衍生化反应条件,确立了柱上衍生GC/MS的检测方法,并对实际纺织样品中PFOS进行分离、检测,结果显示样品中的PFOS含量在0.59~11.27 mg/kg之间,能够满足国际法规对纺织品中PFOS的限量检测要求. 相似文献
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采用超临界CO2提取法提取了披萨草精油,并利用气相色谱/质谱(GC/MS)联用技术和保留指数比较法分析了该精油的化学成分.从SFE披萨草精油中鉴定了28种化合物,占精油总童的94.31%.主要成分为香芹酚(47.61%),丁香酚(16.12%)和麝香草酚(14.81%). 相似文献
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H Ochi T Bamba H Naito K Iwatsuki E Fukusaki 《Journal of Bioscience and Bioengineering》2012,114(5):506-511
Metabolic fingerprinting using gas chromatography with flame ionization detector (GC/FID) was used to generate a practical metabolomics-based tool for quality evaluation of natural cheese. Hydrophilic low molecular weight components, relating to sensory characteristics, including amino acids, fatty acids, amines, organic acids, and saccharides, were extracted and derivatized prior to the analysis. Data on 12 cheeses, six Cheddar cheeses and six Gouda cheeses, were analyzed by multivariate analysis. Prediction models for two sensory attributes relating to maturation, "Rich flavor" and "Sour flavor", were constructed with 4199 data points from GC/FID, and excellent predictability was validated. Chromatograms from GC/FID and gas chromatography/time-of-flight-mass spectrometry (GC/TOF-MS) were comparable when the same column was used. Although GC/FID alone cannot identify peaks, the mutually complementary relationship between GC/FID and GC/MS does allow peak identification. Compounds contributing significantly to the sensory predictive models included lactose, succinic acid, l-lactic acid, and aspartic acid for "Rich flavor", and?lactose, l-lactic acid, and succinic acid for "Sour flavor". Since similar model precision was obtained using GC/FID and GC/TOF-MS, metabolic fingerprinting using GC/FID, which is a relatively inexpensive instrument compared with GC/MS, is easy to maintain and operate, and is a valid alternative when metabolomics (especially using GC/MS) is to be used in a practical setting as a novel quality evaluation tool for manufacturing processes or final products. 相似文献
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马尾松磨木浆丙酮抽出物的分离及分析 总被引:3,自引:1,他引:2
利用DEAE-Sephadex离子交换色谱和气相色谱-质谱联用技术,对马尾松磨木浆丙酮抽出物的化学成分进行了分离及分析。DEAE-Sephadex高子交换色谱可以把丙酮抽出物分离成中性组分、弱酸性组分和强酸性组分,中性组分皂化后可进一步分离成皂化物和不皂化物。利用气相色谱-质谱联用技术,对马尾松磨木浆丙酮抽出物中的弱酸性组分、皂化物和不皂化物的化学成分进行了分析,并分别检测出了一系列化合物。 相似文献
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白肋烟中一些重要碱性成分和羰基化合物的分析研究 总被引:13,自引:0,他引:13
本文对3个地区白肋烟中的一些重要碱性成分和羰基化合物进行了分析研究。采用同时蒸馏萃取的前处理方法和配备氮-磷检测器的气相色谱仪及气质联用仪对重要的碱性香味成分进行了分析鉴定,共鉴定出41种碱性化合物;并采用内标法对白肋烟中的吡啶、2-甲基吡嗪、2,6-二甲基吡嗪、2-乙酰基吡啶等17种重要的碱性香味成分进行了定量测定。采用甲醇超声波振荡提取的前处理方法和气相色谱仪及气质联用仪对醛酮类致香物进行了分析鉴定,共鉴定出46种醛酮类致香物;定量测定了2-戊酮、2,3-戊二酮、6-甲基-5-庚烯-2-酮、6-甲基-3,5-庚二烯-2-酮、糠醛等27种香味物质。研究结果表明:从碱性香味成分总量来看,巴西白肋烟样品>四川白肋烟样品>湖北白肋烟样品;从羰基类致香成分总量来看,湖北白肋烟样品>四川白肋烟样品>巴西白肋烟样品。 相似文献
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From the nonvolatile neutral diterpene components of the pine rosins carbonyls and alcohols (primary and secondary) were separated and the various fractions were analysed by GC and GC/MS. Resin aldehydes and alcohols having the same structure as the pine resin acids are the main components. The remaining neutral components are complex mixtures of diterpene hydrocarbons, tertiary alcohols, and resin acid methyl esters. 相似文献
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Liquid smokes including mesquite, hardwood blend, hickory (aqueous), and hickory-oil (oil-based) were subjected to direct ether extraction; phenolic components were separated and identified using gas chromatography/mass spectrometry (GC/MS). A solution containing 1,250 μg/ml each of phenol, isoeugenol, o -cresol, m -cresol, 4-allylsyringol, catechol, 4-methylcatechol, 2,6-dimethoxy-phenol, 2-methoxyphenol, 4-ethylphenol, and 2,3-dimethylphenol was injected directly or ether extracted prior to GC/MS separation for quantification of phenols in smokes and for recovery calculations. Phenol, guaiacol, syringol, and catechol in ether and ether extracted from oil were used as standards for oil-based smoke. The total amount of phenols in the smokes was similar but the proportions of individual phenols differed. Hickory smoke contained more syringol and its derivatives (4-allysyringol and 4-methylsyringol) than mesquite; mesquite contained more phenol, o-cresol, catechol and 4-methylcatechol than hickory. 相似文献