期刊文献+
共找到3,116篇文章
< 1 2 156 >
每页显示 20 50 100
Published the papers of GC-MS analysis—Chemical drug
1
《Journal of Pharmaceutical Analysis》 SCIE CAS 2011年第1期69-70,共2页
Song Qi, Liu Hu; Gao Shu. Screening and quantitative analysis of volatile markers in the breath of patients with breast cancer Acta Universitatis Medicinalis Anhui, 2010, 45(01) :76-79.
关键词 Chemical drug Published the papers of gc-MS analysis gc MS
在线阅读 下载PDF
LOCATION OF DOUBLE BOND POSITION OF INSECT SEX PHEROMONE BY GC/MS ANALYSIS WITH CHEMICAL IONIZATION
2
作者 Fan Lei KONG Jiangsu Institute of Ecomomes,Jintan Jiangsu,213200 《Chinese Chemical Letters》 SCIE CAS CSCD 1990年第2期109-112,共4页
Ozonolysis products of four lepidopteral pheromone were identified by methane CI-MS.The spectra obtained were notably simpler than those of EI-MS,the peak of molecular ion was normally close to the base peak,and the c... Ozonolysis products of four lepidopteral pheromone were identified by methane CI-MS.The spectra obtained were notably simpler than those of EI-MS,the peak of molecular ion was normally close to the base peak,and the characteristic fragment ions were high in m/z,thereby the interpretation was facilitated. 展开更多
关键词 MS gc LOCATION OF DOUBLE BOND POSITION OF INSECT SEX PHEROMONE BY gc/MS analysis WITH CHEMICAL IONIZATION
在线阅读 下载PDF
Chemical composition, antioxidant activity and GC-MS analysis of juice and peel oil of grapefruit varieties cultivated in India 被引量:5
3
作者 Shahnawaz Ahmed H S Rattanpal +2 位作者 Khalid Gul Rouf Ahmad Dar Akash Sharma 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2019年第7期1634-1642,共9页
Citrus family especially Grapefruit,has attained considerable attention due to the presence of a number of essential components that have cardiovascular and anti-hypertensive properties.The juice and essential oil ext... Citrus family especially Grapefruit,has attained considerable attention due to the presence of a number of essential components that have cardiovascular and anti-hypertensive properties.The juice and essential oil extracted from eight recently released grapefruit cultivars were used to study physicochemical and antioxidant properties.The total soluble solids(TSS),titratable acidity(TA) and pH of juice samples extracted from various grapefruit varieties differed significantly.The refractive index,specific gravity and optical rotation values for the oil varied from 1.473 to 1.396,0.863 to 0.847 and +93 to +86,respectively.The percent 2,2-diphenyl-1-picrylhydrazyl radical activity(% DPPH activity) and ferric reducing antioxidant power(FRAP) values for grapefruit juice and peel oil varied from 24.06 to 18.79,2.91 to 1.44 mmol g^–1 and 84.87 to 74.73,7.76 to 5.73 mmol g^-1,respectively.There were significant differences in physicochemical,antioxidant properties and volatile profiles of extracted juice and oil.The oil exhibited higher DPPH and FRAP values than the juice.Among different components identified which accounted for over 99% of the volatile fraction,limonene,myrcene,and benzopyran were major components in all oil samples. 展开更多
关键词 GRAPEFRUIT JUICE essential oil PHYSICOCHEMICAL PROPERTIES antioxidant PROPERTIES gc-MS analysis
在线阅读 下载PDF
Analysis of vapor phase organics in air of Beijing, Langfang and Tianjin by capillary GC and GC/MS
4
作者 Lai Cong, Wang Dechun, Wei Rurong and Yang WenxiangResearch Center for Eco-Environmental Sciences,Academia Sinica.P.O.Box 934,Beijing 100083,China 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 1990年第1期99-108,共10页
The vapor phase organics (VPOs) in the air of Beijing, Langfang and Tianjin were detected by a capillary gas chromatography and GC/MS during the winter and the summer separately. The tentatively identified compounds i... The vapor phase organics (VPOs) in the air of Beijing, Langfang and Tianjin were detected by a capillary gas chromatography and GC/MS during the winter and the summer separately. The tentatively identified compounds include alkanes, cyclic hydrocarbons, alkenes, aromatics, acids, alcohols, aldehydes, ketones, esters, halocarbons and so on. The numbers of VPOs found are 118 in Beijing, 83 in Lang-fang and 65 in Tianjin in the winter, and 56, 39 and 72 in the summer respectively. Based on the data of some representative compounds determined quantitatively by GC and GC/MS, a profile of organic pollution in the air of the three cities is presented. 展开更多
关键词 vapor organics air pollution gc gc/MS analysis
在线阅读 下载PDF
Antibacterial, Antioxidant Activities and GC-MS Analysis of Dichrostachys cinera (L.) Ethanolic Leaves Extract
5
作者 Sitelbanat Yassin Mohamed Abubker +4 位作者 Anwar Mohamed Selma Omer Salah Humeada Elhadi M. M. Ahmed Mirghani Abd Alrahman 《Pharmacology & Pharmacy》 CAS 2022年第12期545-557,共13页
Traditional medicinal plants are one of the potential sources of antimicrobial drugs and there is a great concern in the use and development of herbal medicine for the treatment of various infections. This study aimed... Traditional medicinal plants are one of the potential sources of antimicrobial drugs and there is a great concern in the use and development of herbal medicine for the treatment of various infections. This study aimed to evaluate the antibacterial, and antioxidant activities of Dichrostachys cinera ethanolic leaves extract and to determine the components of the crude extract. D. cinera extract was evaluated against Staphylococcus aureus ATCC 25923, Escherichia coli ATCC 25922, and Pseudomonas aeruginosa ATCC 27853. The antibacterial, antioxidant activities and active constituents were determined using standard methods. Antibacterial activity of the crude extract findings showed that all bacterial candidates were susceptible where S. aureus represent MIC at 12.5 mg/ml and MBC at 25 mg/ml, E. coli and P. aeruginosa both showed MIC 25 mg/ml and MBC 50 mg/ml. In the free radical scavenging assay of the extract and the standard quercetin at concentrations of 250 μg/ml, 125 μg/ml, 50 μg/ml, 10 μg/ml, and 5 μg/ml. The radical scavenging activity for the extract was about 92%, 89.6%, 86.8%, 82.8% and 37.8% respectively, compared to quercetin which gave 89.7%, 85.8%, 62.1%, 55.5%, and 45% radical scavenging activity. The GC-Ms analysis of the total constituents demonstrated that 1,6-Anhydro-2,4-dideoxy-.beta.-D-ribo-hexo (21.26%) with different peaks, followed by Glycerin (11.56%), 1,2,3-Cyclopentanetriol (10.18%), 8,11,14-Eicosatrienoic acid, (Z,Z,Z)-(6.18%), 1H-Pyrrole, 1-methyl-(6.08%), Phytol (5.91%) and 7-Bromo-6-(2-diethylaminoethoxy)-2,3-dihyd (5.44%) as major components in the extract. Finally, this study provided useful information on the therapeutic potential of D. cinera as an antibacterial agent and recommended to be evaluated against a wide range of Bacterial and fungal strains using different solvents and different parts from the plant. 展开更多
关键词 Dichrostachys cinera Antibacterial Activity ANTIOXIDANT gc MS analysis
暂未订购
Evaluation of the Equality of Non-Polar Capillary Columns in GC/MS Analysis of Food Contact Plastics
6
作者 Motoh Mutsuga Miku Yamaguchi +1 位作者 Yutaka Abe Hiroshi Akiyama 《American Journal of Analytical Chemistry》 2013年第9期476-487,共12页
Non-polar capillary columns for GC/MS are widely utilized in the analysis of additives for food contact materials. Though various kinds of non-polar capillary columns are commercially available, the equality of their ... Non-polar capillary columns for GC/MS are widely utilized in the analysis of additives for food contact materials. Though various kinds of non-polar capillary columns are commercially available, the equality of their performance has not been verified. Herein, ninety-six additives for food contact plastics were analyzed using fifteen kinds of columns, and the peak separation, retention times, and peak areas of each additive were compared. The additives, with various chemical properties, comprised forty four plasticizers, twenty lubricants, twenty antioxidants, nine ultraviolet absorbers, and three other compounds. 10 μg.mL-1 test solutions were prepared in acetone, and injected to the GC/MS. The fifteen columns were classified into five categories based on the chromatogram pattern and peak separation. To facilitate comparison of the retention time and detection sensitivity of the columns for the additives, the relative retention time (RRT) and relative peak area (RPA) were calculated by using dibutylphthalate or 4-tert-butylphenylsalicylate as an internal standard. The RRTs of the additives on each column were essentially similar. However, the RRT of the additives which were detected in the later stages differed slightly. Although the RPA of the plasticizers and lubricants were roughly similar, column-to-column differences were observed for certain additives, such as antioxidants and ultraviolet absorbers. Furthermore, certain fatty acids, antioxidants, two plasticizers, and two benzophenone type ultraviolet absorbers were not detected in the chromatograms of two columns. 展开更多
关键词 NON-POLAR CAPILLARY Column gc/MS analysis Additives for Food Contact PLASTICS RELATIVE Retention Time RELATIVE Peak Area
在线阅读 下载PDF
Study on Fractional Separation and GC-MS Analysis of Flash Coal Tar Pyrolysed at Low Temperatures
7
作者 吴国光 王祖讷 《International Journal of Mining Science and Technology》 SCIE EI 1997年第1期99-102,共4页
The composition of low temperature pyrolysis coal tar has an effect on its further processing and reasomble utlization In this paper, the compeition or coal tars produced from both low temperature pyroysis in a fluidi... The composition of low temperature pyrolysis coal tar has an effect on its further processing and reasomble utlization In this paper, the compeition or coal tars produced from both low temperature pyroysis in a fluidized bed aud flash pyrolysis with solid heat carrier have been investigated by the methch of fractional seperation and Gas Chromatography-Mass Spectrometry (GC-MS)- It is observed that the degree of coalification maceral and secondary reaction temperature (freeboard temperature in a fluidized bed) have some iufluence on the composition of coal tars- The main compoundes are phenol cresols,xylenols, naphthalene, alkylnaphthalenes, antbraceue, phenanthrene,acenaphthylene, fluoren, indene and so 展开更多
关键词 low temperature and FLASH PYROLYSIS COAL TAR FRACTIONAL SEPARATION gc-MS analysis
在线阅读 下载PDF
山苍子油的有机溶剂浸提及其抗氧化活性与 GC-MS 分析
8
作者 李芳 张敏 +1 位作者 Howard Holness Kevin O’Shea 《徐州工程学院学报(自然科学版)》 CAS 2013年第4期28-32,共5页
以不同有机溶剂作为提取介质,获得山苍子油,采用DPPH法比较不同提取介质(不同极性的有机溶剂)对山苍子油抗氧化活力的影响,并对抗氧化性差异较大两款山苍子油(甲醇、戊烷浸提)进行GC-MS组分分析,以1,4-二溴苯为对照品,运用气相色谱面积... 以不同有机溶剂作为提取介质,获得山苍子油,采用DPPH法比较不同提取介质(不同极性的有机溶剂)对山苍子油抗氧化活力的影响,并对抗氧化性差异较大两款山苍子油(甲醇、戊烷浸提)进行GC-MS组分分析,以1,4-二溴苯为对照品,运用气相色谱面积归一化法确定各组分的相对质量分数.在此基础上,探讨山苍子油有机组分与其抗氧化活性之间的关系.研究结果表明:以甲醇浸提获得的山苍子油具备最显著的抗氧化活性(IC50=3.72mg/mL),石油醚最弱(IC50=9.25mg/mL);GC-MS分析结果表明:以甲醇为提取介质得到的山苍子油,其脂肪酸和萜烯氧化物质量分数各占68.33%和6.80%,明显高于低极性的提取介质戊烷的45.57%和4.50%. 展开更多
关键词 山苍子 有机溶剂 DPPH gc—MS分析
在线阅读 下载PDF
Study on the relationship between psoriasis vulgaris and GC gene in Hainan Han nationality based on target gene capture sequencing
9
作者 LIU Kun LIU Jun-lin +2 位作者 YUAN Cheng-da LU Chun-wan YIN Mei 《Journal of Hainan Medical University》 2022年第22期30-35,共6页
Objective:To investigate the relationships between GC gene polymorphisms and psoriasis vulgaris.Methods:A total of 101 patients with psoriasis vulgaris and 79 healthy controls were enrolled into this study,and they we... Objective:To investigate the relationships between GC gene polymorphisms and psoriasis vulgaris.Methods:A total of 101 patients with psoriasis vulgaris and 79 healthy controls were enrolled into this study,and they were all of Han nationality from Hainan province.The target gene capture sequencing method was used to sequence the full length of the GC gene and its 2kb upstream and downstream regions.SNP-based association analysis was performed under four genetic modes in SNPs with minimum allele frequency greater than 1%and the P value of Hardy-Weinberg equilibrium test in the control group is greater than 0.05.Bioinformatics methods were used to predict the impact of risk SNP on gene function.Results:A total of 94 SNPs were detected,of which 93 met the inclusion criteria.SNP-based association analyses showed that 21 SNPs(16 in introns,2 in exons,and 3 in Untranslated Regions)were susceptible to psoriasis vulgaris in at least one genetic mode(OR=0.289‑2.295,95%CI=0.048‑12.670,P<0.05).Bioinformatic prediction indicates that rs4588,located in the exon 11,was a non-synonymous mutation and can convert threonine to lysine(SIFT Score=0.481,SIFT Score Pred=T).rs4752 A>G located in the exon 8 was a synonymous mutation and did not cause amino acid change.Conclusion:GC gene is associated with the susceptibility of psoriasis vulgaris in Hainan Han ethnic group. 展开更多
关键词 gc gene PSORIASIS SNP Association analysis
在线阅读 下载PDF
基于安捷伦490 micro GC煤矿井下气体分析方法的研究
10
作者 陈强盛 《山西化工》 2015年第3期43-45,共3页
利用安捷伦490micro GC进行矿井气体分析,使用标准气体校准标准气体的方式,验证井下气体分析过程中不同方法产生的误差。主要针对甲烷气体浓度进行了分析,得出了低浓度标准气体测得高浓度标准气体结果偏高、高浓度标准气体测低浓度标准... 利用安捷伦490micro GC进行矿井气体分析,使用标准气体校准标准气体的方式,验证井下气体分析过程中不同方法产生的误差。主要针对甲烷气体浓度进行了分析,得出了低浓度标准气体测得高浓度标准气体结果偏高、高浓度标准气体测低浓度标准气体结果偏低的结论,提出了不同浓度标准气体测量气样的参考范围,达到了减小误差的目的,保证了气样分析的准确性。 展开更多
关键词 安捷伦490 MICRO gc 煤矿 气体分析方法
在线阅读 下载PDF
GC-IMS结合多元统计学比较不同产区市售酱香型白酒挥发性风味成分
11
作者 冯雪莹 倪慧 +3 位作者 侯强川 叶明波 郭壮 王玉荣 《中国酿造》 北大核心 2026年第1期282-287,共6页
该研究将4个产自茅台镇和4个产自其他地区的市售酱香型白酒作为研究对象,采用气相色谱-离子迁移谱(GC-IMS)技术结合多元统计学方法,比较分析了不同产区市售酱香型白酒挥发性风味成分的差异。结果表明,8个白酒样品中共检出51种挥发性风... 该研究将4个产自茅台镇和4个产自其他地区的市售酱香型白酒作为研究对象,采用气相色谱-离子迁移谱(GC-IMS)技术结合多元统计学方法,比较分析了不同产区市售酱香型白酒挥发性风味成分的差异。结果表明,8个白酒样品中共检出51种挥发性风味成分,包括酯类24种、醇类9种、醛类10种和酮类8种。主成分分析(PCA)结果表明,茅台镇和其他产区酱香型白酒挥发性风味成分存在差异。基于相对气味活度值(ROAV)共筛选出6种关键挥发性风味化合物(ROAV>1),其中,对茅台镇酱香型白酒香气贡献更突出的为异戊酸乙酯、辛酸乙酯和乙酸异戊酯,ROAV分别为82.25、5.56、1.52,对其他产区酱香型白酒香气贡献更突出的为己酸乙酯、戊酸乙酯和丁酸乙酯,ROAV分别为33.19、32.55、10.48。 展开更多
关键词 酱香型白酒 茅台镇和其他地区 气相色谱-离子迁移谱 多元统计学分析 关键差异挥发性风味化合物
在线阅读 下载PDF
基于GC-MS指纹图谱和化学计量学评价重楼挥发油质量
12
作者 董雨欣 陈建辉 +5 位作者 李娜 朱童岩 于永洲 崔晓燕 赵春颖 熊辉 《中成药》 北大核心 2026年第1期23-27,共5页
目的评价重楼挥发油质量。方法指纹图谱建立采用Shimadzu HP-5MS毛细管柱(30 m×0.25 mm,0.25μm);载气高纯氦气;体积流量1.0 mL/mL;进样口温度250℃;程序升温;电子轰击离子源,轰击能量70 eV;全扫描数据方式。再进行主成分分析和正... 目的评价重楼挥发油质量。方法指纹图谱建立采用Shimadzu HP-5MS毛细管柱(30 m×0.25 mm,0.25μm);载气高纯氦气;体积流量1.0 mL/mL;进样口温度250℃;程序升温;电子轰击离子源,轰击能量70 eV;全扫描数据方式。再进行主成分分析和正交偏最小二乘判别分析。结果20批样品指纹图谱中有21个共有峰,指认出21种成分,相似度均大于0.800(CL006除外)。各批样品(CL038、CL046除外)分为3类,花生酸和反油酸乙酯为潜在质量标志物。结论该方法稳定可靠,可有效识别不同地区重楼挥发油的质量差异,从而为完善该药材质量标准提供理论依据。 展开更多
关键词 重楼 挥发油 质量评价 gc-MS指纹图谱 主成分分析 正交偏最小二乘判别分析
暂未订购
基于GC-MS比较分析不同品牌红烧肉调料包挥发性风味成分
13
作者 杨琳 杨宇 +3 位作者 何玉贞 段丽丽 戢得蓉 李杨 《农产品加工》 2026年第2期89-96,共8页
为快速、精准地鉴别红烧肉调料包的整体风味成分,利用气相色谱与质谱联用(GC-MS)、主成分分析和感官评价对12种知名品牌红烧肉调料包制作的红烧肉中挥发性物质的种类、相对含量进行分析比较。研究表明,12种红烧肉调料包共检出153种挥发... 为快速、精准地鉴别红烧肉调料包的整体风味成分,利用气相色谱与质谱联用(GC-MS)、主成分分析和感官评价对12种知名品牌红烧肉调料包制作的红烧肉中挥发性物质的种类、相对含量进行分析比较。研究表明,12种红烧肉调料包共检出153种挥发性成分,主要含有烯类33种、烷类27种、酯类17种、醇类15种等物质。不同品牌调料包特征物质各异,样品E风味物质种类最多(共43种,烷类和烯类的含量高),样品H烷类物质丰富,样品I烯类物质含量高,样品C具有醛类物质多样,样品B、样品D富含烷类和酸类物质,样品G挥发性成分含量和感官评分最高。但主要风味物质均为烃类、酯类和醛类,其中醛类对红烧肉的整体风味显著影响,因而改进红烧肉调料包需要提高醛类物质含量。 展开更多
关键词 红烧肉调料包 气相色谱-质谱法 主成分分析 挥发性风味 感官评价
在线阅读 下载PDF
基于HS-SPME-GC-MS技术的6种香型白酒中挥发性化合物差异分析
14
作者 胡晓龙 李华 +5 位作者 雷旭东 韩素娜 张俊飞 邓鸣东 黄润娜 王晓毅 《轻工学报》 北大核心 2026年第1期1-15,共15页
【目的】进一步明晰4种基本香型和2种融合香型白酒挥发性化合物特征、关键香气及差异成分。【方法】采用顶空-固相微萃取-气相色谱-质谱联用(HS-SPME-GC-MS)技术、相对气味活度值(ROAV)法及正交偏最小二乘判别分析(OPLS-DA)法,对4种基... 【目的】进一步明晰4种基本香型和2种融合香型白酒挥发性化合物特征、关键香气及差异成分。【方法】采用顶空-固相微萃取-气相色谱-质谱联用(HS-SPME-GC-MS)技术、相对气味活度值(ROAV)法及正交偏最小二乘判别分析(OPLS-DA)法,对4种基本香型和2种融合香型白酒的挥发性化合物分布特征、关键香气成分及重要差异化合物进行分析。【结果】6种香型白酒中共鉴定出207种挥发性化合物,涵盖10个类别,主要为酯类、芳香族类、醇类、烯类、醛类和酮类化合物,且各香型白酒中的挥发性化合物组成差异明显,其中存在于所有香型、单一香型及2~5种香型白酒中的挥发性化合物分别为26种、77种及104种;清香型和米香型白酒中的挥发性化合物种类较少;陶融香型和兼香型白酒在挥发性化合物组成上均与浓香型和酱香型白酒更为相似。此外,己酸乙酯、辛酸乙酯、苯乙酸乙酯等10种挥发性化合物为1种或多种香型白酒的关键香气化合物;己酸乙酯、十四酸乙酯、十六酸乙酯、乙酸乙酯等13种挥发性化合物为区分6种香型白酒的重要差异挥发性化合物。【结论】不同香型白酒挥发性化合物组成存在明显差异,其关键香气化合物与差异化合物均以乙酯类为主,基本香型白酒工艺的科学融合是研制创新香型白酒的重要技术路径。 展开更多
关键词 白酒香型 顶空-固相微萃取-气相色谱-质谱联用技术 挥发性化合物 差异分析
在线阅读 下载PDF
HS-SPME-GC-MS/MS联用分析不同产地防风挥发性成分差异研究 被引量:1
15
作者 蔡瑛 刘家玉 +2 位作者 张臣 王浩 严志宏 《时珍国医国药》 北大核心 2025年第9期1666-1671,共6页
目的通过对不同产地防风挥发性成分分析,探究不同产地防风质量特征。方法通过单因素考察确定最佳萃取条件,采用顶空固相微萃取法(HS-SPME)与气相色谱-三重四极杆质谱(GC-MS/MS)联用,测定河北、辽宁、内蒙古产地防风挥发性化学成分,通过... 目的通过对不同产地防风挥发性成分分析,探究不同产地防风质量特征。方法通过单因素考察确定最佳萃取条件,采用顶空固相微萃取法(HS-SPME)与气相色谱-三重四极杆质谱(GC-MS/MS)联用,测定河北、辽宁、内蒙古产地防风挥发性化学成分,通过面积归一法确定各成分含量。结果最终确定条件为加热时间35min,加热温度95℃,提取时间45min,解析时间5min。在河北防风中鉴定出了41种成分,占挥发性成分总量的87.26%;在辽宁防风中鉴定出了52种成分,占挥发性成分总量的85.26%;在内蒙古产地中鉴定出了38种成分,占挥发性成分总量的72.43%。三产地防风共有的挥发性组分为22个。结论首次采用HS-SPME结合GC-MS/MS对不同产地防风挥发性成分进行比对研究分析,从三种不同产地防风中共检测到了73种成分,其中包括β-巴巴丁烯、瑟丹内酯等22种成分之前未在防风中报道过的成分。结果表明辽宁防风挥发性成分最多,最丰富,内蒙古防风中β-红没药烯相对含量最高,河北防风人参炔醇相对含量最高,通过对不同产地防风挥发性成分的分析及含量测定,为防风道地药材的研究以及防风质量标准研究提供实验研究基础。 展开更多
关键词 防风 产地分析 固相微萃取 挥发性成分 气相色谱-三重四极杆质谱
原文传递
GC-MS analysis of volatile compounds of Perilla frutescens Britton var. Japonica accessions: morphological and seasonal variability 被引量:7
16
作者 Bimal Kumar Ghimire Ji Hye Yoo +1 位作者 Chang Yeon Yu Ill-Min Chung 《Asian Pacific Journal of Tropical Medicine》 SCIE CAS 2017年第7期705-714,共10页
Objective: To investigate the composition of volatile compounds in the different accessions of Perilla frutescens(P. frutescens) collected from various habitats of China and Japan. Methods: In the present study, the e... Objective: To investigate the composition of volatile compounds in the different accessions of Perilla frutescens(P. frutescens) collected from various habitats of China and Japan. Methods: In the present study, the essential oil from the leaves of P. frutescens cultivars from China and Japan was extracted by hydro-distillation and the chemical composition and concentration of the volatile components present in the oils were determined by gas chromatography–mass spectrometry(GC–MS) analysis. Results: Among the volatile components, the major proportion was of perilla ketone, which was followed by elemicin and beta-caryophyllene in the Chinese Perilla cultivars. The main component in the oil extracted from the Japanese accessions was myristicin, which was followed by perilla ketone and beta-caryophyllene. We could distinguish seven chemotypes, namely the perilla ketone(PK) type, perilla ketone, myristicin(PM) type, perilla ketone, unknown(PU) type, perilla ketone, beta-caryophyllene, myristicine(PB) type, perilla ketone, myristicin, unknown(PMU) type, perilla ketone, elemicine, myristicin, beta-caryophyllene(PEMB) type, and the perilla ketone, limonene, betacryophyllene, myristicin(L) type. Most of the accessions possessed higher essential oil content before the flowering time than at the flowering stage. The average plant height, leaf length, leaf width of the Chinese accessions was higher than those of the Japanese accessions. Conclusion:The results revealed that the harvest time and geographical origin caused polymorphisms in the essential oil composition and morphological traits in the Perilla accessions originating from China and Japan. Therefore, these chemotypes with desirable characters might be useful for industrial exploitation and for determining the harvest time. 展开更多
关键词 Perilla frutescens Essential oil gc–MS analysis Morphological character Harvesting time
在线阅读 下载PDF
GC/MS Analysis of Organic Compounds in Hot Water-Extractable Fraction from Shenfu Coal 被引量:8
17
作者 LI Bao-min YUAN Cheng ZONG Zhi-min CAO Jing-pei LIU Guang-feng WEI Xian-yong 《Journal of China University of Mining and Technology》 EI 2007年第3期354-357,共4页
Shenfu Coal was extracted with hot pure water and slurry was isolated. The concentrated benzene-soluble fraction (CBSF) was analyzed with GC/MS and four types of organic compounds (OCs) were detected: HACOCs,DTEs,DMDT... Shenfu Coal was extracted with hot pure water and slurry was isolated. The concentrated benzene-soluble fraction (CBSF) was analyzed with GC/MS and four types of organic compounds (OCs) were detected: HACOCs,DTEs,DMDT and LCAs. The amount of benzyl benzoate which is the most abundant OC was calculated by an inter-nal standard method with an indicated amount of BP. The broken hydrogen bonds and ether bonds were responsible for the extraction of OCs from the coal .DTEs,DMDT and LCAs are essentially insoluble in water,whereas they are soluble,probably owing to intermolecular interaction of OCs with HACOCs. 展开更多
关键词 thermal extraction gc/MS analysis water-soluble fraction benzene-soluble fraction
在线阅读 下载PDF
A post-modification approach to independent compo-nent analysis for resolution of overlapping GC/MS signals: from independent components to chemical components 被引量:1
18
作者 WANG Wei CAI WenSheng SHAO XueGuang 《Science China Chemistry》 SCIE EI CAS 2007年第4期530-537,共8页
Independent component analysis (ICA) has demonstrated its power to extract mass spectra from over-lapping GC/MS signal. However, there is still a problem that mass spectra with negative peaks at some m/z will be obtai... Independent component analysis (ICA) has demonstrated its power to extract mass spectra from over-lapping GC/MS signal. However, there is still a problem that mass spectra with negative peaks at some m/z will be obtained in the resolved results when there are overlapping peaks in the mass spectra of a mixture. Based on a detail theoretical analysis of the preconditions for ICA and the non-negative property of GC/MS signals, a post-modification based on chemical knowledge (PMBK) strategy is pro-posed to solve this problem. By both simulated and experimental GC/MS signals, it was proved that the PMBK strategy can improve the resolution effectively. 展开更多
关键词 INDEPENDENT component analysis (ICA) post modification immune algorithm (IA) gc/MS
原文传递
Smashing Tissue Extraction and GC Analysis of Active Fatty Acids from Oil Cake of Perilla Seeds 被引量:5
19
作者 SUN Yan-ling LIU Yan-ze +2 位作者 XIAO Han WEI Ying-feng ZHAO Yu-qing 《Chinese Herbal Medicines》 CAS 2011年第1期75-78,共4页
Objective To optimize the extraction technology of perilla seeds oil from the oil cake of perilla seeds(OCPS)by using the contents of active fatty acids as evaluation standard.Methods The fatty acids were extracted fr... Objective To optimize the extraction technology of perilla seeds oil from the oil cake of perilla seeds(OCPS)by using the contents of active fatty acids as evaluation standard.Methods The fatty acids were extracted from OCPS,the residue of perilla seeds after cold-press,by smashing tissue extraction(STE),the new technology selected through comparing with classical leaching extraction(LE),Soxhlet extraction(SE),ultrasonic extraction(UE),and supercritical-CO_(2) fluid extraction(SFE).For optimized condition of STE,orthogonal test was designed and completed.The contents of five fatty acids in extracted oil and OCPS were determined by GC.Results The optimized extraction parameters were smashing for 1.5 min under extraction power of 150 W and 1:6 of the material/solvent ratio.The contents of five fatty acids in the oils extracted by five techniques from OCPS and determined by GC were as follows:α-linolenic acid(41.12%-51.81%),linoleic acid(15.38%-16.43%),oleic acid(18.93%-27.28%),stearic acid(2.56%-4.01%),and palmitic acid(7.38%-10.77%).Conclusion The results show that STE is the most efficient technology with the highest yield(LE:0.57%;SE:1.03%;UE:0.61%;SFE:0.80%;STE:1.17%)and shortest time(LE:720 min;SE:360 min;UE:30 min;SFE:120 min;STE:1.5 min)among five tested extraction technologies.It is first reported using STE to extract herbal oil enriched with active fatty acids. 展开更多
关键词 fatty acids flash extraction gc analysis oil cake of perilla seeds Perilla frutescens smashing tissue extraction
原文传递
基于GC-IMS分析白木香花、叶和茶的挥发性成分差异
20
作者 邓鸿铃 何婉桐 +4 位作者 廖美琼 梁敏华 梁志理 东方 王海波 《广东农业科学》 2025年第11期130-140,共11页
【目的】白木香为我国特有珍稀药用植物,其树脂器官(沉香)资源稀缺,但花、叶等非树脂器官资源丰富。旨在分析白木香花、叶和加工品(茶)挥发性成分差异,明确器官特性与加工工艺对挥发性成分的影响机制,为白木香资源差异化开发提供支撑。... 【目的】白木香为我国特有珍稀药用植物,其树脂器官(沉香)资源稀缺,但花、叶等非树脂器官资源丰富。旨在分析白木香花、叶和加工品(茶)挥发性成分差异,明确器官特性与加工工艺对挥发性成分的影响机制,为白木香资源差异化开发提供支撑。【方法】以同一植株来源的白木香花、叶为原料,并按传统乌龙茶工艺制成白木香茶;采用GC-IMS技术检测白木香花、叶和茶的挥发性成分,并优化顶空与色谱条件,结合LAV 软件、Clustvis平台对挥发性成分峰体积数据进行成分定性、主成分分析(PCA)。【结果】利用GC-IMS技术从白木香花、叶和茶中共检出90种挥发性成分(83种已知),以酯类(24.10%)、醇类(21.69%)为主,醛类(18.07%)、酮类(14.46%)次之,检出数量较GC-MS技术提取提升30%,且可区分2-己烯醛、壬醛等同分异构体。白木香花的挥发性成分以叔丁醇、壬醛等短链醛醇类为主;叶富含2-己烯醛、乙硫醚等绿叶挥发物;茶富集(E,E)-2,4-庚二烯醛二聚体、2-乙基-3-甲基吡嗪等热加工衍生成分。主成分分析中,主成分1与主成分2的累计贡献率达93.8%,可有效区分白木香花、叶和茶,实现3类样品的快速鉴别。【结论】GC-IMS技术在白木香挥发性成分检测中优势显著,检出效率优于GC-MS。该研究明确白木香花(天然花香香精)、叶(草本茶饮)、茶(功能性茶饮)的差异化开发方向,为白木香非树脂器官高效利用及药用植物成分精准分析提供科学依据与技术路线。 展开更多
关键词 白木香 气相离子迁移谱(gc-IMS) 挥发性成分 主成分分析 乌龙茶工艺
在线阅读 下载PDF
上一页 1 2 156 下一页 到第
使用帮助 返回顶部