The identification of Al nanoclusters by electrospray ionization mass spectrometry (ESI-MS)

Tian, Chenhao; Feng, Chenghong; Wang, Qixuan

doi:10.1016/j.scitotenv.2020.142154

Cited by 18 publications

(8 citation statements)

References 72 publications

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“…The primary factors affecting the formation of charged ions in ESI sources are the capillary voltage, high temperature, and nitrogen. The ionization degree of the sample can be changed by adjusting the voltage, temperature, and gas flow in the ESI source [ 31 , 32 ]. Therefore, the parameters, such as the capillary voltage, desolvation temperature, desolvation gas flow, cone gas flow, and nebulizer gas flow in the ESI source within a range, were adjusted.…”

Section: Resultsmentioning

confidence: 99%

Accurate Determination of the Degree of Deacetylation of Chitosan Using UPLC–MS/MS

Xue

Wang

Yang

et al. 2022

IJMS

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The mole fraction of deacetylated monomeric units in chitosan (CS) molecules is referred to as CS’s degree of deacetylation (DD). In this study, 35 characteristic ions of CS were detected using liquid chromatography–electrospray ionization–mass spectrometry (LC–ESI–MS/MS). The relative response intensity of 35 characteristic ion pairs using a single charge in nine CS samples with varying DDs was analyzed using 30 analytical methods. There was a good linear relationship between the relative response intensity of the characteristic ion pairs determined using ultrahigh performance (UP) LC–MS/MS and the DD of CS. The UPLC–MS/MS method for determining the DD of CS was unaffected by the sample concentration. The detection instrument has a wide range of application parameters with different voltages, high temperatures, and gas flow conditions. This study established a detection method for the DD of CS with high sensitivity, fast analysis, accuracy, stability, and durability.

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Section: Resultsmentioning

confidence: 99%

Accurate Determination of the Degree of Deacetylation of Chitosan Using UPLC–MS/MS

Xue

Wang

Yang

et al. 2022

IJMS

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“…ESI-MS was carried out on a Bruker micr0T0F-QIII (MS), Thermo ULtimate3000 (HPLC). The quantification by ESI-MS was based on the ratio of the relative intensities of the products. ,, For isotope-labeling experiments, the products in gas were detected by a mass spectrometer.…”

Section: Methodsmentioning

confidence: 99%

Insight into the Mechanism of Water-Promoted Hydrogenation of Maleic Acid to Succinic Acid on Pd/C Catalyst

Dou

Deng

Qing

et al. 2022

ACS Sustainable Chem. Eng.

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Solvent provides additional degrees of freedom to regulate catalyst reactivity in liquid-phase heterogeneous catalysis, but it is still a challenge to have insight into the multifaceted solvent effects. Herein, a remarkable promotional effect of water in maleic acid (MAc) hydrogenation to succinic acid (SAc) was observed. Kinetic studies showed that the apparent activation energy in water was much lower than in organic solvents. A series of isotope-labeling experiments were designed, and the products were analyzed by NMR ( 1 H, 13 C, 2 H, and DEPT135 spectra). The results showed that D 2 O participated in MAc C�C hydrogenation and 34.7% of SAc was deuterated. The structures of these deuterated compounds were further confirmed by electrospray mass spectrometry (ESI-MS). The detailed mechanism of water participating in MAc C�C hydrogenation was studied by quasi-in situ mass spectrometry experiments. The results showed that H 2 exchanged with D 2 O and formed the HD 2 O* transition state over the active site of Pd. Quantitative 13 C NMR demonstrated that 46.2% of SAc was generated through the HD 2 O* transition state pathway. Based on these results, a rational mechanism of MAc hydrogenation in aqueous solution was proposed. Finally, a recyclability experiment showed that Pd/C had much better stability in water than in organic solvents.

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“…Beyond the primary characterization techniques outlined earlier, an array of supplementary methods stands to augment our comprehensive understanding of defects in MOFs. These additional techniques include high-resolution neutron powder diffraction (HRNPD), 130 electrospray ionization mass spectrometry (ESI-MS), 131 atomic force microscopy (AFM), 132 and confocal fluorescence microscopy (CFM), 133 alongside the strategic integration of multiple approaches. Each of these methods provides distinct and invaluable insights into the nature, distribution, and typology of defects within MOFs, thereby enriching our understanding of their structural complexities.…”

Section: Construction and Characterization Of Defective Mofsmentioning

confidence: 99%

Defect-containing metal–organic framework materials for sensor applications

An,

Chen,

Liang

et al. 2024

J. Mater. Chem. A

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The identification of Al nanoclusters by electrospray ionization mass spectrometry (ESI-MS)

Cited by 18 publications

References 72 publications

Accurate Determination of the Degree of Deacetylation of Chitosan Using UPLC–MS/MS

Accurate Determination of the Degree of Deacetylation of Chitosan Using UPLC–MS/MS

Insight into the Mechanism of Water-Promoted Hydrogenation of Maleic Acid to Succinic Acid on Pd/C Catalyst

Defect-containing metal–organic framework materials for sensor applications

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