Molecular weight parity predicted from the parity values of mass spectral peaks

1981 ◽  
Vol 16 (2) ◽  
pp. 82-84 ◽  
Author(s):  
In Ki Mun ◽  
Rengachari Venkataraghavan ◽  
Fred W. McLafferty
Keyword(s):  
Molecular Weight ◽  
Mass Spectral ◽  
Spectral Peaks

scholarly journals Antimicrobial, Antifertility and Antiinflammatory Approach to Tetradentate Macrocyclic Complexes of Iron(II) and Manganese(II)

2002 ◽  
Vol 8 (6) ◽  
pp. 347-353 ◽  
Author(s):  
Ashu Chaudhary ◽  
D. P. Jaroli ◽  
R. V. Singh
Keyword(s):  
Molecular Weight ◽  
Reproductive Organs ◽  
Spectral Studies ◽  
Central Metal Atom ◽  
Central Metal ◽  
Testicular Sperm ◽  
Mass Spectral ◽  
Sperm Density ◽  
Elemental Analyses

Some antifertility inhibitors of 18 to 24-membered tetraazamacrocyclic complexes of iron(II) and manganese(II) have been synthesised by the template condensation using 1,3-phenylenediamine with malonic acid, succinic acid, glutaric acid and adipic acid. The reaction proceed smoothly to completion. The complexes were characterized by elemental analyses, molecular weight determinations, infrared, electronic, magnetic moment, mössbaur and mass spectral studies. The elemental analyses are consistent with the formation of the complexes [M(N4Ln)Cl2] (M = Fe(lI) or Mn(II)). All these complexes are stable and monomeric in nature as indicated by the molecular weight determinations. The spectral studies confirm the octahedral geometry around the central metal atom. The complexes have been screened in vitro against a number of fungi and bacteria to assess their growth inhibiting potential. The testicular sperm density and testicular sperm morphology, sperm motility, density of cauda epididymal spermatozoa and fertility in mating trials and biochemical parameters of reproductive organs have been examined and discussed.

Clustering Mass Spectral Peaks Increases Recognition Accuracy and Stability of SVM-based Feature Selection

2010 ◽  
Vol 03 (02) ◽  
pp. 048-054 ◽  
Author(s):  
Mikhail Pyatnitskiy ◽  
Maria Karpova ◽  
Sergei Moshkovskii ◽  
Andrey Lisitsa ◽  
Alexander Archakov
Keyword(s):  
Feature Selection ◽  
Recognition Accuracy ◽  
Mass Spectral ◽  
Spectral Peaks ◽  
Accuracy And Stability

Preparation and Spectroscopic Characterisation of a Series of Heterobimetallic N-phenyldiethanolaminate-alkoxide Derivatives of Oxovanadium(V)

2005 ◽  
Vol 2005 (6) ◽  
pp. 352-355 ◽  
Author(s):  
Rajendra Singh Ghadwal ◽  
Ram C. Mehrotra ◽  
Anirudh Singh
Keyword(s):  
Molecular Weight ◽  
Spectral Studies ◽  
Metal Alkoxides ◽  
Nmr Studies ◽  
Mass Spectral ◽  
Elemental Analyses ◽  
Derivatives Of ◽  
Spectroscopic Characterisation

Reaction of VO(OPri)3 with two equivalents of N-phenyldiethanolamine (PhDEAH2) yields a homometallic complex [VO(PhDEA)(PhDEAH)] 1, which reacts with a number of metal alkoxides to afford heterobimetallic oxovanadium(V) complexes of the types [VO(PhDEA)2{M(OR)n-1}] [where PhDEA = C6H5N(CH2CH2O–)2], [M =: Al (n = 3, R = Pri) 2; Al (n = 3, R = But) 3; Ti (n = 4, R = Pri) 4; Zr (n = 4, R = Pri) 5; Nb (n = 5, R = Pri) 6; Ta (n = 5, R = Pri) 7. The derivative [VO(PhDEA)(OSiPh3)] 8 has been prepared by the equimolar interaction of [VO(PhDEA)(OPri)] with Ph3SiOH. All of these complexes have been characterised by spectroscopic (IR; 1H, 13C, 27Al and 51V NMR) studies, elemental analyses, and molecular weight measurements. The derivative 2 has also been characterised by FAB mass spectral studies, which supports for its monomeric nature.

Mass Spectral Identification of Some Hallucinogenic Drugs

1968 ◽  
Vol 51 (1) ◽  
pp. 164-175
Author(s):  
Sander W Bellman
Keyword(s):  
Molecular Weight ◽  
Lysergic Acid ◽  
Low Molecular Weight ◽  
Hallucinogenic Drugs ◽  
Mass Spectral ◽  
Spectral Identification ◽  
Fragmentation Patterns ◽  
General Method

Abstract A general method is given for the mass spectral identification of some hallucinogenic drugs. The fragmentation patterns observed in the spectra are discussed. Three groups of hallucinogens have been studied: lysergic acid amides, methoxy substituted phenylalkylamines, and tryptamine derivatives. Similarities in the fragmentation patterns of the members of each group are observed. The fragmentation patterns described can be used to identify hallucinogenic drugs even in the presence of low molecular-weight impurities.

Identification of Rubber Additives by Field Desorption and Fast Atom Bombardment Mass Spectroscopy

1984 ◽  
Vol 57 (5) ◽  
pp. 1013-1022 ◽  
Author(s):  
Robert P. Lattimer ◽  
Robert E. Harris ◽  
Doyle B. Ross ◽  
Hugh E. Diem
Keyword(s):  
Molecular Weight ◽  
Mass Range ◽  
Molecular Ions ◽  
Organic Additives ◽  
Compound Identification ◽  
Mass Spectral ◽  
Rubber Compounds ◽  
General Answer ◽  
Background Ions ◽  
Normal Background

Abstract From the results presented here, it is clear that FD-MS and FAB-MS are very effective analytical methods for the identification of organic additives in extracts from rubber compounds. In the examples above, the molecular weight information provided by FD and FAB provided a nice complement to the IR data. In cases where IR could give only a general answer (i.e., a compound class), the mass spectral data provided a very specific compound identification. It is encouraging that all the samples examined gave useful spectra by both FD and FAB analysis. In most cases, the same information was obtained by both techniques. Certain compounds, however, were observed by FD but not by FAB (wax, oil, isocyanurate antioxidant). While FD provided only molecular weight information, FAB also provided fragmentation to aid in the confirmation of component assignments. Both the FD and FAB mass spectra were fairly complex for most of the extracts, but for different reasons. In FD, oil and wax oligomers gave many molecular ions over a wide mass range. FAB spectra, on the other hand, were somewhat cluttered due to the normal background ions produced by the sputtering process. With both techniques, however, the various components in some fairly complex mixtures were readily identified.

scholarly journals A modified FASP protocol for high-throughput preparation of protein samples for mass spectrometry

2016 ◽  
Author(s):  
Jeremy Potriquet ◽  
Marut Laohaviroj ◽  
Jeffery Bethony ◽  
Jason Mulvenna
Keyword(s):  
Mass Spectrometry ◽  
Molecular Weight ◽  
Spectral Analysis ◽  
High Throughput ◽  
Efficient Method ◽  
Work Flow ◽  
Mass Spectral Analysis ◽  
Mass Spectral ◽  
Molecular Weight Cutoff ◽  
Cellulose Membranes

To facilitate high-throughput proteomic analyses we have developed a modified FASP protocol which improves the rate at which protein samples can be processed prior to mass spectrometry. Adapting the original FASP protocol to a 96-well format necessitates extended spin times for buffer exchange due to the low centrifugation speeds tolerated by these devices. However, by using 96-well plates with a more robust polyethersulfone molecular weight cutoff membrane, instead of the cellulose membranes typically used in these devices, we could use isopropanol as a wetting agent, decreasing spin times required for buffer exchange from an hour to 30 minutes. In a typical work flow used in our laboratory this equates to a reduction of 3 hours per plate. To test whether our modified protocol produced similar results to FASP and other FASP-like protocols we compared the performance of our modified protocol to the original FASP and the more recently described eFASP and MStern-blot. We show that all FASP-like methods, including our modified protocol, display similar performance in terms of proteins identified and reproducibility. Our results show that our modified FASP protocol is an efficient method for the high-throughput processing of protein samples for mass spectral analysis.

Biodegradation at the Seafloor: Ultrahigh Resolution FT-ICR Mass Spectral Characterization of Natural Petroleum Seeps

2014 ◽  
Vol 2014 (1) ◽  
pp. 2083-2097
Author(s):  
Amy M. McKenna ◽  
Jeffrey T. Williams ◽  
Jonathan C. Putman ◽  
Christoph M. Aeppli ◽  
Christopher M. Reddy ◽  
...  
Keyword(s):  
Resolving Power ◽  
Ion Cyclotron Resonance ◽  
Organic Mixture ◽  
Mass Spectral ◽  
Nickel Porphyrin ◽  
Spectral Peaks ◽  
Single Mass ◽  
Simultaneous Identification ◽  
Ft Icr

ABSTRACT We report the first resolution, identification, and characterization of nickel and vanadyl porphyrins simultaneously in weathered oil samples derived from natural seeps in Southern California. Atmospheric pressure photoionization (APPI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) provides ultrahigh resolving power (m/Δm50% > 1,000,000 at m/z 500) and sub-ppm mass error (<50 ppb) required to identify nickel porphyrin isotopes for unambiguous elemental composition assignment. We also report the first simultaneous identification and categorization of both vanadyl and nickel porphyrins in the same sample, without prior sample fractionation. More than 85,000 mass spectral peaks are resolved and identified in a single mass spectrum, and represent the most extensive molecular deconvolution of an organic mixture characterized to date.

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