顶空气相色谱——质谱法测定漳州产匍匐迷迭香挥发性成分

利用顶空气相色谱——质谱法快速测定匍匐迷迭香叶及花的挥发性成分。结果表明:匍匐迷迭香叶片含40种挥发性成分,其中α-蒎烯含量最高,为19.56%;花中含27种挥发性成分,其中α-蒎烯含量最高,为19.77%。经鉴定,匍匐迷迭香接近西班牙型。

气相色谱——质谱联用技术在环境检测中的应用

由于气相色谱——质谱联用技术相对于传感器技术来说更具灵敏度,并且选择性较强,所以在环境有害物质的检测中普遍的推广。文章主要是针对在实际操作中常用的前处理技术进行了简单的阐述,并且对气相色谱-质谱联用技术在水和空气中的污染物的检测的应用以及研究进展情况进行了分析。

气相色谱-质谱联用法在食品安全分析中的应用

摘要：气相色谱——质谱联用技术（GC-MS），首次出现在20世纪后期，不仅有着气相色谱所具有的高分离效能，又有着质谱所具有的准确鉴定各种化合物结构的优点，故在石化、环境与食品、农残等领域广泛应用，尤其在分析易衍生或易挥发化合物中发挥着重要作用。为此，文章从分析GC—MS特点入手，对该技术在食品安全分析中的具体应用做一综述性分析。

顶空固相微萃取—气质联用分析尾巨桉叶片挥发油化学成分

应用顶空固相微萃取法提取尾巨桉叶片挥发油,同时以气相色谱——质谱法结合色谱保留指数法对化学成分进行定性定量分析。结果表明:尾巨桉叶片挥发油中共有86种化合物,其中相对含量大于0.3%的成分有40个,占色谱峰总流总面积的89.65%,主要成分是桉油精(33.10%)、α一蒎烯(10.58%)、1-甲基-2-(1-甲基乙基)苯(8.98%)、乙酸松油酯(6.96%)、乙烯基甲醚(3.13.%)、龙脑烯醛(1.59%)、己醛(1.54%)、己烷(1.42%)等组分。

HS-GCMS气质方法检测蓝莓酒中香气成分研究

为探讨自制蓝莓果酒的香气成分与市场销售蓝莓果酒的香气成分的差异,在对比条件下采用GC-MS QP2010 plus气相色谱——质谱联用仪（日本岛津公司）perkin Elmer Turbo Matrix 40 Trap（美国PE公司）;色谱柱为Stabilwax-DA（30m×0.32mm×0.25um）弹性石英纤维毛细管柱,载气为高纯He气,流量2~5ml/min;质谱条件全扫描模式,扫描范围35~500aum,量子源温度200°C,建立了一种新的同时检测蓝莓酒中47中香气成分含量的HS-GCMS气质方法,为我国蓝莓酒的检测提供新的思路和科学依据。酿酒酵母Fermivin发酵的蓝莓酒主要香气成分为3-甲基戊酸乙酯,相对含量为10.31%,己酸乙酯10.27%,乙酸乙酯为9.69%。此外还含有独特的香气成分苯乙醇。市售蓝莓酒中还含有少量对人体不利的物质。

气质联用测定甘蓝中氟虫腈残留的不确定度评定

介绍用气相色谱—质谱联用法测定甘蓝中氟虫腈残留量不确定度的方法,建立不确定度评定的数学模型,进而分析确定了不确定度的来源,并对其各个分量进行量化和合成。评定结果表明:标准曲线拟合、重复性测量和回收率是其测量不确定度的主要来源;当甘蓝中氟虫腈含量为0.0821 mg/kg时,扩展不确定度U=0.00492 mg/kg(k=2)。

气质联用法测定纺织品中乙二醇单甲醚和乙二醇单乙醚的含量

通过对纺织品中的乙二醇单甲醚和乙二醇单乙醚通过甲醇超声提取,采用GC-MS程序升温方式进行分析测定。结果表明该方法对乙二醇单甲醚和乙二醇单乙醚可获得较好的回收率(88.3%～103.5%),相对标准偏差为3.8%～8.3%,方法检测限为2.0mg/kg～3.5mg/kg。该法检出限低、准确度和精密度高,适用于纺织品中乙二醇单甲醚和乙二醇单乙醚的分析检测。

漳州柠檬香茅精油化学成分GC-MS分析

采用水蒸气蒸馏法从福建漳州产柠檬香茅草中提取精油,利用气相色谱——质谱(GC-MS)技术对挥发油的化学成分进行分析鉴定,鉴定出84个成分,占挥发油色谱总馏出峰面积的99.94%以上,其中含量最高的2个成分是(Z)-3,7-二甲基-2,6-辛二烯醛(21.49%)和(E)-3,7-二甲基-2,6-辛二烯醛(20.88%)。

GC-MS测定无花果中脂肪酸组成

以无水乙醚为溶剂,用索氏抽提法提取无花果中粗脂肪,进行甲酯化后以正己烷萃取,用 GC-MS 测定脂肪酸甲酯,分析鉴定出16种脂肪酸,并测定出各脂肪酸的相对含量,不饱和脂肪酸相对含量约占85.4%。

Chemical composition and anti-MRSA activity of the essential oil from Chinese eaglewood

To analyze the constituents of essential oil from Chinese eaglewood [resinous wood of Aquilaria sinensis （Lour.） Gilg] and its anti-methicillin-resistant Staphylococcus aureus （MRSA） activity. The essential oil was extracted by water-steam distillation and analyzed by GC/MS method. The relative contents of the compounds were determined by normalization. The compounds were characterized by NIST05 and WILEY275L database matching and comparison of their MS spectra with those of literature data. Antibacterial activity of the oil was assayed by the filter paper disc agar diffusion method. The oil showed significant antibacterial activity against MRSA. Sixty-six chromatographic peaks were detected, among them thirty compounds comprising 59.80% of the total essential oil were characterized. Twenty-six compounds comprising 54.26% of the oil were identified as sesquiterpenes. β-Agarofuran （8.96%）, kusunol （7.82%）, （-）-jinkoh-eremol （5.04%）, agarospirol （4.53%）, baimuxifuranic acid （4.09%） were the major sesquiterpenes. Four nor-sesquiterpenes and some other sesquiterpenes, such as 10-epi-γ-eudesmol, α-agarofuran, epi-ligulyl oxide, etc. were detected in Chinese eaglewood oil for the first time. This is the first report about anti-MRSA activity of Chinese eaglewood oil from A. sinensis.

Chemical Compositions of Volatile Oil from Fruiting Body of Armillaria luteo-virens

The chemical compositions of volatile oil from fruiting body of Armillaria luteo-virens in Qinghai Province were firstly analyzed with GC-MS and its relevant compositions were detected by calculating chromatographic peak area with normalized method. 21 peaks were separated and 13 compositions were identified which were mainly unsaturated fatty acids, taking 97.1% of the total volatile oil.

Supercritical Fluid Extraction of Essential Oil from Dry Rhizome of Ligusticum chuanxiong Hort and Their Characterization by GC/MS

Supercritical fluid extraction (SFE) of essential oil from dry rhizome ofLigusticum chuanxiong Hort was developed. GC/MS was used for the determination of the composition ofessential oil. Forty-four compounds were identified. The conventional extraction method wasconducted in parallel for comparison. The extracts were qualitatively compared by GC/MS. The yieldsof SFE and steam distillation-extraction were 4.16 % ( v/w) and 0.8 % ( v/w), respectively.Application of SFE of zessential oil from dry rhizome of Ligustiaan chuanxiong Hort was preferable.

GC-MS Analysis of Essential Oil Constituents from Rhizome and Root of Notopterygium forbesii

Aim To analyse the chemical constituents of the essential oil extracted from the rhizome and root of Notopterygium forbesii Boiss. and provide scientific basis for quality control. Methods The total essential oil was extracted by water-steam distillation and separated by capillary gas chromatography (GC). The components were determined by normalization method, and identified by GC-MS. Results GC-MS exhibited 217 peaks and 100 compounds were identified, accounting for 78.3% of the total essential oil. Conclu...

Analysis of Volatile Constituents in Lonicera japonica Thunb. from Different Origins by GC-MS

[Objective] This study aimed to analyze the volatile constituents in Lonicera japonica Thunb. from different origins. [Method] HP-5MS capillary columns were used and column temperature was controlled by a program. MS analysis was performed with EI and quadruple mass analyzer. The volatile constituents in L. japonica Thunb. were identified by NIST02 and Wiley275 libraries, and their relative contents were determined with chromatographic peak area normalization method. [Result] According to GC-MS total ion-current chromatograms, 35 volatile constituents were identified in L. japonica Thunb. from Guangxi Zhuang Autonomous Region, mainly including methyl linolenate, n-hexadecanoic acid and ζ-muurolene; 18 volatile constituents were identified in L. japonica Thunb. from Hunan Province, mainly including n-hexadecanoic acid, linoleic acid and α-curcumene. [Conclusion] Main volatile constituents in L. japonica Thunb. from two different origins varied significantly.

Analysis for the Volatile Secondary Metabolites of Mortierella alpina

[ Objective] The study was to investigate the volatile components of secondary metabolites from M. alpine producing arachidonic acid and explore the changes in its metabolic pathway. [ Method] The air above M. alpine broth was extracted by solid-phase microextraction（SPME） during the post-exponential phase of growth and analyzed by GC-MS. [Result] 13 compounds were identified, 12 of which were sesquiterpenes with C15H24 formula and accounting for 99.62% of the complete compounds. Thujopsene-（ 12）, α-Guaiene and Aristolene were three most sesquiterpenes accounting for 10.66%, 33.69% and 34.85% of total content respectively. It can be sufficiently certified that sesquiterpene metabolic pathway existing in M. alpine. [ Coclusion] Metabolic flux of sesquiterpene pathway increased to improve its mass accumulation, because one or several key enzyme genes mutation in isoprene or sesquiterpene pathway enhanced their activities during induction of mutation from initial strain.

GC-MS Analysis of Essential Oil Constituents from Buds of Tussilago farfara L.

Aim To analyse the constituents of the essential oils extracted from the buds of Tussilago farfara L. in the GAP Bases of Traditional Chinese Medical Materials and provide scientific basis for quality control. Methods The essential oils were extracted by water-steam distillation and separated by GC capillary column chromatography. The components were quantitatively determined by normalization, and identified by GC-MS. Results GC-MS exhibited 259 peaks and 65 compounds were identified, accounting for 84.62% of the total essential oil. Conclusion In the total essential oil contained in the buds of Tussilago farfara L., copaene （2.36%）, （ ＋ ） -Epi-bicyclosesquiphellandrene （ 3.91% ）, γ- elemene （2.18%）, fl-bisabolene （ 13.93% ）, spathulenol （ 3.44% ） as the sesquiterpenes and its derivatives, and 1-undecene （4.83%）, （ E）-cycloundecene （8.49%）, bicycle [ 10. 1.0] tridec-l-ene （ 1. 45% ）, 1-tridecene （3.44%）, （Z）-7,11-dimethyl-3-methylene-1,6,10-dodecatriene （2.66%）, 1- pentadecene （4.57%）, [ 1R-（ 1R^＊, 4Z, 9S^＊ ） ]-4,11,11-trimethyl-8-methylene-bicyclo [ 7.2.0] undec-4-ene （ 1.03% ）, 6,6-dimethyl-2-methylene-7-（ 3-oxobutylidene ）-oxepan-3-ylmethyl acetic acid ester （2.02%）, 1, E-11, Z-13-heptadecatriene （ 3.72% ）, （ Z, Z, Z） -9,12,15-octadecatrien-l-ol （ 1.85% ）, 3,7,11-trimethyl-dodeca-2,4,6,10-tetraenal （ 1.31% ）, n-hexadecanoic acid （ 3.12% ） , （Z, Z） -9,12-octadecadienoic acid （2.26%）, （ Z, Z, Z） -9,12,15-octadecatrienoic acid methyl ester （ 1.12% ） , heneicosane （ 1.82% ）, and pentacosane （ 1.03% ） are the main components.

GC-MS Analysis of Essential Oil Constituents from Rhizome and Root of Notopterygium incisum

Aim To analyse the chemical constituents of the essential oil extracted from the rhizome and root of Notopterygium incisum Ting ex H.T. Chang, providing scientific basis for quality control. Methods The total essential oil was extracted by water-steam distillation and separated by capillary gas chromatography （GC）. The components were determined by normalization method, and identified by GC-MS. Results GC-MS exhibited 242 peaks and 83 compounds were identified, accounting for 75.77% of the total essential oil. Conclusion In the total essential oil of the rhizome and root of N. incisum, monoterpenes and sesquiterpenes accounted for 13.63% and 67.93%, respectively, in which （ 1S）-β-pinene （ 1.67% ）, 3-carene （ 1.05% ）, limonene （ 1.22% ）, and 1S-endo-bornyl acetate （ 1.68% ） as the monoterpenes and its derivatives, and （ ＋ ） -β-elemene （6.78%）, sativene （1.54%）, α-caryophyllene （2.64%）, germacrene D （1.67%）, eudesma-4 （ 14 ）, ll-diene （2.36%）, α-selinene （2.42%）, δ-cadinene （ 1.55% ）, 3,7,11-trimethyl-2,6,10-dodecatrien-1-ol （1.03%）, （ ＋ ）-elemol （5.18%）, （-）-spathulenol （1.40%）, guaiol （3.81%）, dehydroxy-isocalamendiol （ 1.06% ）, γ-eudesmol （ 1.05% ）, α-eudesmol （7.97%）, bulnesol （3.09%）, and carotol （2. 30% ） as the sesquiterpenes and its derivatives were main components. In addition, isopropyl transcinnamate was the maximum compound （ 11.3% ） of the total essential oil.

Leaf Volatiles Induced by Mechanical Damage from Diverse Taxonomic Tree Species

Plant volatiles induced by wounding play key roles in plant-insect and plant-plant interactions. To deeply understand the mechanism of their induction by wounding and their functions in interplant communications, four diverse tree species: ashleaf maples ( Acer negundo L.), hankow willow (Salix matsudana Koidz.), Chinese white poplar ( Populus tomentosa Carr.) and poplar opera 8277 (P. simonii x P. pyramibalis cv.), were used as materials. The blends of volatiles collected after damage were detected with GCMS. Most of the induced compounds reach high concentrations in 5 h. They are acyclic monoterpenes, fatty acid derivatives, and aromatic compounds. To authors' knowledge, dimethyl adipate, diisobutyl succinate and benthothiazole have never been reported in previous herbivore insect-plant systems, After being damaged 2 h, green leaf volatiles were released in large amount. The repellents were detected in higher concentration after 24 h. The time of releasing is different within different species, but many kinds of volatiles widely existed in different trees. There were some difference among species. Health ashleaf maple released more terpenoids, but poplars and willow produced more aromatic compounds.

Analysis of Active Components of Hexane Extractives of Morus alba Leaves

[Objective]The aim was to explore the active compound of Morus alba leaves with the analysis of active components of hexane extractives of M.alba leaves.[Method]Antibacterial assays of hexane extractives of M.alba leaves were done and the volatile components of hexane extractives of M.alba leaves with the strongest antibacterial activity were analyzed by gas chromatography-mass spectrometry（GC-MS）.[Result]The results of inhibitory effect of hexane extractives of M.alba leaves on Staphylococcus aureus and Escherichia coli showed that hexane extractives of M.alba leaves collected in June,July and August had antibacterial activity against S.aureus and had no antibacterial effect against E.coli.Furthermore,hexane extractives of M.alba leaves collected in June had the strongest antibacterial activity against S.aureus（inhibition diameter 10.95 mm）.The hexane extractives of M.alba leaves collected in June was analyzed by GC-MS,the main volatile components were tetradecane（16.76%）,dodecane（13.20%）,diisobutyl phthalate（10.26%）,decane（9.10%）,hexadecane（8.71%）,linolenyl alcohol（7.25%）,octadecane（5.88%）,eicosane（3.26%）,dibutyl phthalate（2.59%）.[Conclusion]Linolenyl alcohol was the potential antibacterial compound.

Composition of Essential Oils of Morus alba Leaves and Chamaecyparis pisifera Outer Heartwood

[Objective] The aim was to explore the composition of essential oils of Morus alba leaves and Chamaecyparis pisifera outer heartwood. [Method] The essential oils of M. alba leaves and C. pisifera outer heartwood were analyzed by gas chromatography-mass spectrometry,respectively. [Result] Alcohols [phytol （59.47%,extracted 3 h for M. alba leaves）,α-cadinol （38.77%,extracted 6 h for C. pisifera outer heartwood）] were their first principal volatile components. Phytol was usually used as pharmaceutical raw material and α-cadinol was a kind of active organic compound with antibacterial function. [Conclusion] The essential oils of M. alba leaves and C. pisifera outer heartwood with hydrodistillation have medicinal value.