Simultaneous analysis of trans- and cis-isomers of 2-glucosyloxycinnamic acids and coumarin derivatives in Dendrobium thyrsiflorum by high-performance liquid chromatography (HPLC)-photodiode array detection (DAD)-electrospray ionization (ESI)-tandem mass spectrometry (MS)

Zhang, Guangnong; Zhang, Fang; Yang, Li; Zhu, Enyuan; Wang, Zhengtao; Xu, Li; Zhi-bi, HU

doi:10.1016/j.aca.2006.04.062

Cited by 35 publications

(20 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…332–334 In one evaluation, different types of interactions were explored between vapors and networked metal nanoparticles with four ligands chosen to provide different degrees of van der Waals force ( n -octanethiol, C 8 SH ligand), polarizibility (2-naphthalenethiol, NAP ligand), polarity (4-methoxythiolphenol, MOP ligand) and hydrogen bond acceptance (2-benzothiazolethiol, MBT ligand). 325 The responses of these ligands coupled to nanoparticles were investigated using ten diverse organic vapors and measured by both chemiresistors and TSM sensors with the goal of establishing a correlation between the chemical structure of a ligand shell of the networked metal nanoparticles and vapor response. Comparison of responses of sensing materials obtained with chemiresistors and TSMs revealed that chemiresistors had much higher sensitivity (Table 6) but with a less varied response pattern between different vapors.…”

Section: Integration Of Sensing Materials With Transducersmentioning

confidence: 99%

Materials and Transducers Toward Selective Wireless Gas Sensing

et al. 2011

View full text Add to dashboard Cite

Introduction 7315 1.1. Diversity of Monitoring Needs of Volatiles 7315 1.2. Chemical Interferences As the Key Noise Parameter for Wireless Sensors 7316 1.3. Goals and Scope of This Review 7317 1.4. Topics That Are Out of Scope of This Review 7317 2. Anatomy of Wireless Gas Sensors 7317 2.1. Active and Passive Wireless Sensors 7318 2.2. Transducers for Wireless Passive Sensors 7319 2.3. RFID Sensors 7320 2.4. Key Performance Factors of Wireless Sensors 7320 2.5. Summary of Specific Requirements for Wireless Gas Sensors 7321 3. Need for Transducers with Multiple Response Mechanisms 7321 3.1. Limitations of Sensor Arrays for Tethered and Wireless Gas Sensing 7322 3.2. Data Processing 7322 3.3. Multivariate Sensing 7323 4. Integration of Sensing Materials with Transducers 7323 6.3. System Approach for Development of Wireless Gas Sensors 7345 6.4. Path Forward 7345 Author Information 7346 Biographies 7346 Acknowledgment 7347 References 7347

show abstract

Section: Integration Of Sensing Materials With Transducersmentioning

confidence: 99%

Materials and Transducers Toward Selective Wireless Gas Sensing

et al. 2011

View full text Add to dashboard Cite

show abstract

“…These include simultaneous determination of five furocoumarins in Angelica dahurica by LC-UV [19,20], qualitative determination of the major coumarins in Zushima and simultaneous determination of coumarin derivatives in Dendrobium thyrsiflorum by LC-DAD-ESI-MS [21,22], chromatographic characterization of furocoumarins by LC-DAD-ESI-MS n in the roots of Angelica dahurica [23], LC-MS and MECC analysis of coumarins [24]. LC-DAD-ESI-MS has been proven to be a powerful method for the rapid identification and determination of the ingredients in traditional Chinese medicine or botanic extracts.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Qualitative Analysis of Coumarins in the Rhizome of Angelica polymorpha Maxim. by LC–DAD–ESI–MS

Liu

Yu²,

et al. 2011

Chromatographia

View full text Add to dashboard Cite

A novel method has been developed for simultaneous qualitative analysis of coumarins in the rhizome of Angelica polymorpha Maxim. with the use of high-performance liquid chromatography (LC)-photodiode array detection (DAD)-electrospray ionization (ESI)-tandem mass spectrometry (MS). LC analysis was performed on an Agilent Eclipse XDB-C 18 analytical column with a gradient solvent system of water and methanol, ultraviolet (UV) absorption detection was at 300 nm and peak UV spectrum and (?) ESI-MS data were acquired by DAD and a quadrupole mass spectrometer, respectively. Eight peaks were identified as linear furocoumarins including aviprin, isopimpinellin, bergapten, isooxypeucedanin, gosferol, imperatorin, phellopterin and isoimperatorin by comparing their retention time, UV, and MS spectra with that of the authentic standards, and the analysis of UV spectra and ESI-MS data of the standards gave the characteristics of UV absorption and ESI-MS fragmentation. On the basis of the above characteristics, the possible structures of four other linear furocoumarins were deduced in LC. The other chemical structures were proposed as three angular furocoumarins, a simple coumarin, two chromones, and a cinnamic acid by comparing their UV and MS data with that of literature reports. Accordingly, the method we established can simply and accurately identify the key chemical constituents in the rhizome of A. polymorpha.

show abstract

“…Methods employing liquid chromatography-mass spectrometry (LC-MS) and in some cases gas chromatography mass spectrometry (GC-MS) in different matrices have been reported [4][5][6][7][8][9][10][11][12][13][14][15][16]. Fragmentation patterns of some coumarins using high and low resolution mass spectrometry in electron ionization (EI) mode have been reported in the literature [17][18].…”

Section: Introductionmentioning

confidence: 99%

Gas phase ion chemistry of coumarins: ab initio calculations used to justify negative chemical ionization trends

Sichilongo¹,

Jaoko²,

Mbaiwa

et al. 2015

Bull. Chem. Soc. Eth.

View full text Add to dashboard Cite

ABSTRACT. The gas phase ion chemistry of coumarins using electron ionization (EI), positive chemical ionization (PCI) and negative chemical ionization (NCI) in a time of flight and quadrupole mass spectrometer (qMS) coupled to a gas chromatograph is outlined. The observations in NCI mode were complimented with Ab initio calculations. This was because NCI gave enhanced signals in contrast to EI and PCI and therefore could serve as a potential ionization method for quantitative analysis. For the two classes of analytes that were examined here, i.e. methyl and acetyl coumarin derivatives, experimental data showed that the methyl derivatives underwent dissociative electron capture to produce ions of the type [M-H]¯ while the acetyl derivatives underwent resonance electron capture to produce ions of the type M˙¯. The M˙¯ type of ions were more intense than the earlier. Ab initio calculations showed higher electron affinities in the acetyl than the methyl derivatives.

show abstract

Simultaneous analysis of trans- and cis-isomers of 2-glucosyloxycinnamic acids and coumarin derivatives in Dendrobium thyrsiflorum by high-performance liquid chromatography (HPLC)-photodiode array detection (DAD)-electrospray ionization (ESI)-tandem mass spectrometry (MS)

Cited by 35 publications

References 15 publications

Materials and Transducers Toward Selective Wireless Gas Sensing

Materials and Transducers Toward Selective Wireless Gas Sensing

Simultaneous Qualitative Analysis of Coumarins in the Rhizome of Angelica polymorpha Maxim. by LC–DAD–ESI–MS

Gas phase ion chemistry of coumarins: ab initio calculations used to justify negative chemical ionization trends

Contact Info

Product

Resources

About