Observation of CO₂ and solvent adduct ions during negative mode electrospray ionization Fourier transform ion cyclotron resonance mass spectrometric analysis of monohydric alcohols

Abstract

The formation mechanisms of O3 and O4 adducts from monohydric alcohols in negative ion ESI FT-ICR MS were proposed. The solvent adduction effects can be eliminated or reduced by optimizing the collision energy of CID in FT-ICR MS.

Unexpected interaction between deprotonated biliverdin and alcohols as studied by ESI‐MS

“…[9] Inorganic anions solvated by methanol can be successfully detected by ESI-MS. [10] ESI-MS can be also used for detection of interaction between methanol and organic anions. [11][12][13] Interaction between methanol and anion may have an interesting practical implication. For example, solvation of inorganic anions may affect their separation selectivity upon capillary electrophoresis analysis.…”

Recovering Valuable Hydrocarbon Molecules from Used Lubricating Oils via Supercritical CO2 Extraction

“…Apart from monohydric alcohol (O 1 ) species, carboxylic acid (O 2 ) species, which represent the unseparated aromatic and olefinic components, unexpected O 3 , and even O 4 ionic species are also present. Previous research has discussed the formation of O 3 ionic species from monohydric alcohols through addition reactions with other species and the formation of O 4 ionic species from O 3 species with the addition of a solvent alcohol molecule 62 (the distribution of O 2 , O 3 , and O 4 compounds are shown in the Supporting Information). Figure 8b shows isoabundance plots of double bond equivalence (DBE) as a function of the carbon number for the O 1 compounds obtained from negative ESI Orbitrap MS in SD feed and its SFE fractions.…”

“…Atmospheric pressure chemical ionization (APCI) is an effective ionization source for the characterization of saturated hydrocarbons. − However, as a result of its ionization mechanism, it leads to the generation of fragment ions that affect the overall judgment. , Electrospray ionization (ESI) is a soft ionization technique for detailed characterization of polar compounds in petroleum without fragment ions. − However, hydrocarbons are nonpolar compounds that cannot be directly ionized by ESI. Ruthenium-ion-catalyzed oxidation (RICO) has been used to transform saturated hydrocarbons into alcohols and ketones, and it can also convert aromatic-attached aliphatic appendages and alkenes to their carboxylic acid derivatives, which can be analyzed by negative ESI HRMS. − Zhou et al , characterized the monohydric alcohols (O 1 ) in the products obtained from the RICO oxidation reactions and RICO–LiAlH 4 reduction reactions by negative ESI FT-ICR MS. The results were in agreement with those analyzed by field ionization gas chromatography time-of-flight mass spectrometry (FI GC–TOF MS), which meant that it could be used as a potential semi-quantitative analysis for saturates.…”

Molecular Characterization of Fossil and Alternative Fuels Using Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry: Recent Advances and Perspectives

“…Phenolic compounds are also important acidic species in petroleum that can be characterized along with naphthenic acids through (−)­ESI . The O1 class species (having only one oxygen heteroatom in the molecules) in (−)­ESI mass spectra could be phenols and alcohols; however,alcohols are not easily ionized by (−)­ESI and could be suppressed by acids . In addition, the O1 class species assigned from (−)­ESI mass spectra usually have the most abundant series with a minimum DBE value of 4, which implies that they are alkyl phenols.…”

“…109 It was found that monohydric alcohols in the RICO product can form O3 and O4 adduct ions in (−)ESI, which could mislead the interpretation of the composition analysis of the alcohols, especially when they are in a complex mixture. 106 The O3 adducts are formed by the coupling of a monohydric alcohol ion with CO 2 . The O4 species are formed by the adducting of O3 ionic species with an alcohol molecule of the solvent, such as methanol or ethanol.…”