Encyclopedia of Analytical Chemistry最新文献_第2页

Near‐Infrared Spectroscopy in Natural Product Research 近红外光谱在天然产物研究中的应用

Encyclopedia of Analytical Chemistry Pub Date : 2020-11-05 DOI: 10.1002/9780470027318.A9909

C. Huck

{"title":"Near‐Infrared Spectroscopy in Natural Product Research","authors":"C. Huck","doi":"10.1002/9780470027318.A9909","DOIUrl":"https://doi.org/10.1002/9780470027318.A9909","url":null,"abstract":"The properties of natural products are related to certain classes of compounds such as alkaloids, flavonoids, and essential oils. Traditionally, separation techniques including thin-layer chromatography (TLC), liquid chromatography (LC), gas chromatography (GC), and capillary electrophoresis (CE) even hyphenated to mass spectrometry (MS) were used for the elucidation and qualitative and quantitative analyses of individual compounds. In the food industry, spectroscopic investigations using infrared radiation have been used to monitor and evaluate the composition and quality since the early 1960s. During the last four decades, near-infrared (NIR) spectroscopy (800–2500 nm; 12,500–4000 cm−1) has become one of the most attractive and used methods for analysis for the following reasons: It represents a noninvasive analytical tool allowing a fast and simultaneous qualitative and quantitative characterization of natural products and their constituents. In this contribution, the principle, technique, and methodology are described followed by a discussion of quantitative and qualitative application possibilities. Finally, some hints to helpful regulatory issues and advantages and limitations are critically evaluated. \u0000 \u0000 \u0000Keywords: \u0000 \u0000near-infrared spectroscopy; \u0000natural product; \u0000medicinal plant; \u0000transflection; \u0000diffuse reflection; \u0000multivariate analysis; \u0000cluster analysis","PeriodicalId":119970,"journal":{"name":"Encyclopedia of Analytical Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127472166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Microextraction Techniques Based on the Combination of Agitation and Extraction in the Same Device 基于搅拌与萃取在同一装置中结合的微萃取技术

Encyclopedia of Analytical Chemistry Pub Date : 2020-11-04 DOI: 10.1002/9780470027318.A9502

M. Roldán-Pijuán, R. Lucena, S. Cárdenas

引用次数: 0

Far‐Ultraviolet Spectroscopy in the Solid and Liquid States, Principle, Instrumentation, and Application 远紫外光谱在固体和液体状态，原理，仪器和应用

Encyclopedia of Analytical Chemistry Pub Date : 2020-11-04 DOI: 10.1002/9780470027318.a9279.pub2

Y. Morisawa, I. Tanabe, Y. Ozaki

引用次数: 0

Neutron Vibrational Spectroscopy 中子振动光谱学

Encyclopedia of Analytical Chemistry Pub Date : 2020-11-04 DOI: 10.1002/9780470027318.a9359.pub2

S. Parker

引用次数: 0

Plant Steroids: Occurrence, Biological Significance, and Their Analysis 植物类固醇:发生、生物学意义及其分析

Encyclopedia of Analytical Chemistry Pub Date : 2020-09-18 DOI: 10.1002/9780470027318.a9931.pub2

G. Gunaherath, A. Gunatilaka

引用次数: 2

Single‐Molecule Fluorescence Imaging Techniques 单分子荧光成像技术

Encyclopedia of Analytical Chemistry Pub Date : 2020-09-17 DOI: 10.1002/9780470027318.a9494.pub2

Michael J. Morten, D. A. Reid, E. Rothenberg

引用次数: 0

Apoptosis (Programmed Cell Death) Studied by Fluorescence Spectroscopy 荧光光谱法研究细胞程序性死亡

Encyclopedia of Analytical Chemistry Pub Date : 2020-09-17 DOI: 10.1002/9780470027318.a9351.pub2

Michelle M. Martinez, G. Khanal, D. Pappas

引用次数: 0

Inductively Coupled Plasma Mass Spectrometry Analysis of Environmental Samples for the Quantification of Potentially Toxic Species 电感耦合等离子体质谱法分析环境样品中潜在有毒物质的定量

Encyclopedia of Analytical Chemistry Pub Date : 2020-06-04 DOI: 10.1002/9780470027318.a9689

Robert Teuma‐Castelletti, N. Sadiq, D. Beauchemin

引用次数: 0

Surface‐Enhanced Raman Spectroscopy: General Introduction 表面增强拉曼光谱：总论

Encyclopedia of Analytical Chemistry Pub Date : 2020-03-18 DOI: 10.1002/9780470027318.a9276.pub2

Songyuan Ding, Xue‐Min Zhang, En-Ming You, B. Ren, Z. Tian

引用次数: 6

Identification of Improvised Inorganic Explosive Devices by Analysis of Postblast Residues Using Ion Chromatography and Capillary Electrophoresis 离子色谱和毛细管电泳分析简易无机爆炸装置爆炸后残留物的鉴定

Encyclopedia of Analytical Chemistry Pub Date : 2020-03-13 DOI: 10.1002/9780470027318.A9031

J. Hutchinson, C. Johns, G. Dicinoski, P. Haddad

{"title":"Identification of Improvised Inorganic Explosive Devices by Analysis of Postblast Residues Using Ion Chromatography and Capillary Electrophoresis","authors":"J. Hutchinson, C. Johns, G. Dicinoski, P. Haddad","doi":"10.1002/9780470027318.A9031","DOIUrl":"https://doi.org/10.1002/9780470027318.A9031","url":null,"abstract":"Chemical analysis of the residues from improvised explosive devices (IEDs) has become a topical subject as a result of increased frequency of terrorist bomb attacks. There is a need to identify the type of explosive device and its composition, which in turn can assist in the identification of the perpetrators. \u0000 \u0000 \u0000 \u0000IEDs can either be organic based (high explosives) or the more easily produced inorganic-based low explosives. Analysis of residues remaining after the deflagration of an inorganic IEDs presents several problems. A wide variety of ionic species may be present (such as unconsumed starting products, ionic species formed as part of the reaction) along with environmental or background species. Therefore, it is important that the target ions used to identify the device can be separated from other background ions present in the sample. The instrumental techniques of capillary electrophoresis (CE) and ion chromatography (IC) are proving to be ideally suited to this task. Both techniques have fundamental advantages, with CE offering highly efficient separations within a short run time, and IC offering high selectivity, sensitivity, and reproducibility. \u0000 \u0000 \u0000 \u0000In this article, an outline of the analytical methods used in this area is presented, with particular focus on the application of CE and IC. A brief literature review of published methods is provided, along with background information on inorganic explosives, sampling techniques, portable instrumentation, and recent developments.","PeriodicalId":119970,"journal":{"name":"Encyclopedia of Analytical Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122003381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2