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采用固相微萃取法提取、富集姜醋汁中的香气成分,经GC-MS分离与分析,共鉴定出59种香气成分,其含量占挥发性成分的92.62%,包括酯类、醇类、酸类、醛酮类、单萜及倍半萜类和杂环类化合物,以酸类(30.09%)、单萜及倍半萜类(22.92%)、酯类(20.05%)为主.其中主要成分为乙酸(26.25%)、柠檬醛(8.12 %)、乙酸乙酯(5.01%)、3-羟基-2-丁酮(4.35%)、姜烯(3.55%)、乙酸异戊酯(3.48%)、乙酸正戊酯(3.12%)、苯乙醇(2.81%)、丁二酸二乙酯(2.30%)、乙酸-2-苯乙酯(2.14%)等.这些物质的共同作用形成了姜醋独特的风味. 相似文献
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Pitomba (Talisia esculenta Radlk.) is a Brazilian exotic fruit consumed specially in the Amazonian region. Because of its large consumption and also due to the lack of knowledge regarding its chemical composition, pitomba fruit was studied in relation to its phenolic and aroma constitution. Using liquid chromatography tandem mass spectrometry (LC–MS/MS), 13 phenolic compounds (catechins, flavonoids and organic acids) were tentatively identified by comparison with standards and by fragmentation patterns. A validated method was applied to quantify common phenolic compounds of the pitomba pulp, for which quinic acid was the main compound (507.8 ± 7.4 μg g− 1 DWP). Gas chromatography mass spectrometry (GC–MS) was employed along with headspace solid-phase microextraction (HS-SPME) to assess the aroma composition of pitomba fruit. A total of 27 volatile organic compounds (VOCs) were tentatively identified for pitomba fruit, for which 2-phenethyl acetate (17.89%) and isopentyl acetate (13.43%) esters were the main VOCs, contributing to the characteristic aroma of pitomba. The antioxidant capacity of the extract of pitomba fruit was evaluated by ABTS, DPPH and ORAC assays. We observed that pitomba has a moderate antioxidant activity. 相似文献
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为研究CO2浸渍工艺对干红毛葡萄酒香气成分的影响,采用仪器辅助液液萃取方式提取传统工艺和CO2浸渍工艺酿造的干红毛葡萄酒中的香气成分,并进行气相色谱/质谱(GC/MS)联机分析.结果表明:2种葡萄酒中共鉴定出48种香气化合物,主要为醇类、酯类、酸类和酚类物质等,其中传统葡萄酒中鉴定出32种,而CO2浸渍葡萄酒中鉴定出41种.和传统葡萄酒相比,CO2浸渍酒中仅有酸类物质的含量发生轻微下降,其他物质(如醇类、酯类和酚类等)的含量以及香气物质的总含量都表现出不同程度的上升.综合来看,CO2浸渍工艺酿造的干红毛葡萄酒的香气质量比传统工艺酿造的葡萄酒要好. 相似文献
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A. Pérez-Silva E. Odoux P. Brat F. Ribeyre G. Rodriguez-Jimenes V. Robles-Olvera M.A. García-Alvarado Z. Günata 《Food chemistry》2006,99(4):728-735
Volatile compounds from cured vanilla beans were extracted using organic solvents. Sensory analysis showed that the aromatic extract obtained with a pentane/ether (1/1 v/v) solvent mixture provided the extract most representative of vanilla bean flavour. Sixty-five volatiles were identified in a pentane/ether extract by GC–MS analysis. Aromatic acids, aliphatic acids and phenolic compounds were the major volatiles. By GC–O analysis of the pentane/ether extract, 26 odour-active compounds were detected. The compounds guaiacol, 4-methylguaiacol, acetovanillone and vanillyl alcohol, found at much lower concentrations in vanilla beans than vanillin, proved to be as intense as vanillin. 相似文献
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A powerful technique was developed for the identification and quantification of 9 volatile compounds of beer, using headspace solid phase micro-extraction (HS/SPME) and gas chromatograph coupled to a mass spectrometer and a flame ionization detector (GC/MS/FID). Optimized parameters included type of fiber, desorption time, and exposure time. Optimization was achieved with standard solutions of the target compounds. All samples were analyzed in triplicate. An exposure time of 45 min with PDMS fiber in the sample headspace was enough to reach equilibrium of the phases. A desorption time of 15 min in the gas chromatograph injector was enough for the fiber to desorb the target compounds. It was found that less polar compounds were more readily absorbed by the fiber (for example, isoamyl acetate) than more polar compounds (for example, acetaldehyde), under the extraction conditions, due to the nature of the fiber. Extraction conditions are important criteria to perform a good quantification of volatile compounds. Concentrations found in sampled beer, for the compounds of interest, ranged between 0.32 and 41.7 ppm. Results show that the reproducibility of the technique depends on the compounds. Esters have higher values (RSD mean value 5.05%) than higher alcohols (RSD mean value 2.5%) and aldehydes (RSD 3.7%). The simplicity of the validated methodology enables its use as a regular quality control procedure for beer flavor analysis. PRACTICAL APPLICATION: This study describes a technique successfully used to identify and quantify volatiles of interest in beer that can be used for quality control purposes under normal brewery production conditions. The technique uses a gas chromatograph coupled to a mass spectrometer with a flame ionization detector. 相似文献
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建立了顶空-气质联用(HS-GC/MS)法,对烟用接装纸中挥发性有机化合物(VOCs)残留量进行测试.结果表明:(1)该方法检测限为0.001-0.004 mg/mL,回收率为89.35%- 108.96%,相对标准偏差(RSD)<4%;(2)所有52个被检烟用接装纸榉品均为合格样品,所有样品中均未检出苯、乙苯、二甲苯、乙酸异丙酯、丁酮,YC171-2009《烟用接装纸》标准中规定的5种VOCs成分中只有乙酸正丁酯有个别检出;(3)醇类检出率较高,其中所有样品都有乙醇检出,异丙醇、正丁醇的检出率也比较高;(4)丙二醇甲醚有较高的检出率,且其检出量相对较大.研究结果充分说明,该方法适合于烟用接装纸中VOCs的快速批量检测. 相似文献
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采用液液萃取法对山西降脂醋进行预处理,应用毛细管气相色谱和色质联用(GC/MS)技术对其进行定性分析,结果表明,山西降脂醋中高沸点的物质含量较多,山西降脂醋中检测出了41种香气成分,有酸类、醇类、酯类、酮类、醛类、杂环化合物等.主要香气成分有醋酸、2-羟基-2-甲基-丙酸、丁酸、2,3-丁二醇、1,3-丁二醇、戊内酯、二氢-5-甲基-3(H)-呋喃酮、糠醇、1,3-二乙酰氧基丙烯、3,4-二甲基-2-丁酸、苯乙酸、香草醇、2-糠醛、苯乙醇、吡啶、四甲基吡嗪. 相似文献
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采用固相微萃取法提取、富集黑加仑果醋中的香气成分,经GC-MS分离与分析,结合谱库检索技术对化合物进行鉴定,应用峰面积归一化法测定各成分的相对含量,共鉴定出89种香气成分。其中,匹配度在80以上有35种,其含量占挥发性成分的81.65%,包括酸类(3种)、酯类(7种)、酚类(3种)、醇类(4种)、烃类(13种)、醛酮类(4种)和醌类(1种)化合物,酸类(33.38%)的相对含量最高,其次是酯类(26.44%)、酚类(8.69%)、醇类(4.91%)、烃类(4.61%)、醛酮类(3.28%)、醌类(0.34%),这些物质的共同作用形成了黑加仑果醋独特的风味。 相似文献
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采用两种萃取头(50/30μm DVB/CAR/PDMS和100μm PDMS),利用顶空固相微萃取(SPME)-气质联用(GC/MS)分析四个大蒜主产地蒜薹中的挥发性成分。研究结果表明,100μm PDMS萃取头适合分析蒜薹中的挥发性成分,永年、惠民、商河、广饶四个产地的蒜薹共有的含硫化合物为二烯丙基二硫醚、甲基烯丙基三硫醚、二烯丙基三硫醚、二烯丙基硫醚、3-乙烯基-1,2-二硫杂-4-环己烯、1,3-二硫酸-2-硫酮、3,4-二甲基噻吩、1,3-二噻烷,其中二烯丙基二硫醚的含量最高。进一步分析表明,蒜薹不同部位的含硫化合物含量有一定差异,蒜薹含硫化合物含量:根部>茎中部>茎上部。本研究对于促进蒜薹加工利用,拓宽蒜薹产业链具有重要意义。 相似文献
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沙棘果醋香气成分的GC/MS分析 总被引:2,自引:0,他引:2
采用顶空固相微萃取法对沙棘果醋的香气成分进行提取,用气相色谱-质谱对香气化合物进行分析,结合谱库检索技术对化合物进行鉴定,应用峰面积归一化法测定各成分的相对含量,共分离鉴定出82种香气成分,其中,匹配度在80以上有35种,其相对总量为84.57%。该35种主要的香气成分中,酯类(11种),酸类(2种)、烃类(17种)、醇类(1种)、酮类(2种)、酚类(2种)。其中,相对含量最高的是酯类(56.35%),其次是烃类(12.58%)、酸类(11.33%)、酮类(1.93%)、酚类(1.57%)、醇类(0.81%)。 相似文献