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Sihang Xu
Stevens Institute of Technology
Mass spectrometryChemistryProtonationMass spectrumKovats retention index
6Publications
2H-index
16Citations
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Publications 6
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#1Sihang Xu (Stevens Institute of Technology)H-Index: 2
#2Ramu Errabeli (Stevens Institute of Technology)H-Index: 1
Last. Athula B. Attygalle (Stevens Institute of Technology)H-Index: 32
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A sulfur-containing compound causes the foul smell of the defensive pygidial gland fluid of Ceroglossus buqueti Laporte and Ceroglossus magellanicus Gehin. This compound was identified as 3-methyl-1-(methylthio)-2-butene by a comparison of its mass spectrum, and chromatographic properties with those of a chemically synthesized standard. Although a few sulfur compounds are known from insect secretions, this sulfur-bearing isoprene derivative has not been characterized previously from any arthropo...
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#1Sihang Xu (Stevens Institute of Technology)H-Index: 2
#2Ramu Errabelli (Stevens Institute of Technology)H-Index: 2
Last. Athula B. Attygalle (Stevens Institute of Technology)H-Index: 32
view all 5 authors...
Abstract Pyrazines are an important group of natural products widely used as food additives and fragrants. Gas chromatography-mass spectrometry (GC MS) is the most widely applied analytical technique for characterization of alkylpyrazines. However, mass spectra of many positional isomers of alkylpyrazines are very similar. Consequently, an unambiguous identification of each positional isomer by spectral interpretation or database search protocols is practically unfeasible. In fact, there are man...
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#1Ramu Erabelli (Stevens Institute of Technology)
#2Sihang Xu (Stevens Institute of Technology)H-Index: 2
Last. Athula B. Attygalle (Stevens Institute of Technology)H-Index: 32
view all 3 authors...
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#1Sihang Xu (Stevens Institute of Technology)H-Index: 2
#2Ramu Errabeli (Stevens Institute of Technology)H-Index: 1
Last. Athula B. Attygalle (Stevens Institute of Technology)H-Index: 32
view all 5 authors...
Ponerine ants are known to contain mixtures of pyrazines in their mandibular glands. We analyzed the mandibular gland contents of four ponerine species (Odontomachus chelifer, O. erythrocephalus, O. ruginodis, and O. bauri) by gas chromatography coupled with mass spectrometry, and found that each species contains specific mixtures of trisubstituted alkylpyrazines among other volatiles. Attempts to identify alkylpyrazines solely by mass spectral interpretation is unrealistic because spectra of po...
2 CitationsSource
#1Sihang Xu (Stevens Institute of Technology)H-Index: 2
#2Julius Pavlov (Stevens Institute of Technology)H-Index: 8
Last. Athula B. Attygalle (Stevens Institute of Technology)H-Index: 32
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6 CitationsSource
#1Sihang XuH-Index: 2
#2Yong ZhangH-Index: 25
Last. Athula B. AttygalleH-Index: 32
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Upon activation in the gas phase, protonated alkyl dihydrocinnamates undergo an alcohol loss. However, the mechanism followed is not a simple removal of an alkanol molecule after a protonation on the alkoxy group. The mass spectrum of the m/z 166 ion for deuteron-charged methyl dihydrocinnamate showed two peaks of 1:5 intensity ratio at m/z 133 and 134 to confirm that the incipient proton is mobile. The proton initially attached to the carbonyl group migrates to the ring and randomizes before a ...
8 CitationsSource
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