Fmoc-protected amino acids were commercially available from GL Biochem (Shanghai) Ltd. Other reagents and solvents were brought from Acros, Sigma-Aldrich, Alfa Aesar, Sinopharm Chemical Reagent Co., Ltd. and Innochem Chemical Reagent. Dichloromethane (DCM) was distilled over calcium hydride (CaH2) or NaH under argon atmosphere. All reactions vessels were oven-dried before use. Reactions were monitored by thin-layer chromatography (TLC) and visualized by UV analyzer (254 nm). 1H and 13C-NMR spectra was recorded on a Bruker 600 MHz instrument. Chemical shifts (δ) were reported relative to TMS (0 ppm) for 1H-NMR and 13C-NMR spectra. The coupling constants (J) were displayed in Hertz (Hz) and the splitting patterns were defined as follows: singlet (s); broad singlet (s, br); doublet (d); doublet of doublet (dd); triplet (t); quartet (q); multiplet (m). ESI-MS was measured with a Bruker Esquire-LC mass spectrometer. High resolution mass (HR-MS) spectra were measured on a Waters Xevo G2 QTOF mass spectrometer.
Esquire lc mass spectrometer
Manufactured by Bruker
The Esquire-LC mass spectrometer is a compact and robust liquid chromatography-mass spectrometry (LC-MS) system designed for routine analysis. It features an electrospray ionization (ESI) source and can be used for the detection and identification of a wide range of analytes in complex samples.
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3 protocols using esquire lc mass spectrometer
1
Synthesis of Fmoc-protected Amino Acids
2
Synthesis of Fmoc-Protected Amino Acids
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Fmoc-protected amino acids were commercially available from GL Biochem (Shanghai) Ltd. Other reagents and solvents were brought from Sigma-Aldrich and Sinopharm Chemical Reagent Co., Ltd. ESI-MS was measured with a Bruker Esquire-LC mass spectrometer.
3
ESI Mass Spectrometry Protocol
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ESI (electron spray ionization) mass spectra were recorded with a Bruker Esquire-LC mass spectrometer at the service department of the TU Darmstadt.
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