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Micromass quattro 2

Manufactured by Waters Corporation

The Micromass Quattro-II is a triple quadrupole mass spectrometer designed for high-performance liquid chromatography (HPLC) analysis. It features a dual-channel electrospray ionization (ESI) source and can be used for a variety of analytical applications, including quantitative and qualitative analysis of small molecules.

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4 protocols using micromass quattro 2

1

Mass Spectrometry Analysis of Heterocyclized Peptides

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ESI-MS and FT-ICR analyses
were performed at the University of Utah Mass Spectrometry and Proteomics
Core facility. ESI was done using a Micromass Quattro-II (Waters),
and analysis of spectra was carried out using predicted masses obtained
from Monoisotopic Mass calculator. FT was performed following cleavage
of heterocyclized peptide by chymotrypsin or PatA protease, using
a LTQ FT Ultra Hybrid Mass Spectrometer (Thermo Scientific) and analyzed
both manually using predicted masses from Monoisotopic calculator
and using Mascot from Matrix Science. MALDI-TOF samples were mixed
with 1-cyano-4-hydroxycinnamic acid (10 mg mL–1 in
50:50 water: methanol with 0.1% trifluoroacetic acid) and analyzed
using a Micromass MALDI micro MX (Waters) using an automated targeting
protocol.
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2

Isolation and Purification of trtE

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To obtain pure trtE, the cell pellet from 1 liter of T. turnerae T7901 culture was extracted three times with acetone (100 ml). The solution was dried under vacuum to yield an extract (70 mg), which was dissolved in methanol (2 ml) and flushed through a cartridge containing end-capped C18 resin. The flow-through was purified by HPLC using 85% acetonitrile in water to obtain trtE (3.4 mg). A Phenomenex Onyx Monolithic semiprep C18 column (100 x 10 mm) was used for HPLC, as conducted on a Hitachi Elite Lachrom System equipped with a Diode Array L-2455 detector. LC/ESI-MS was performed using a Micromass Quattro-II (Waters) instrument on an analytical Agilent Eclipse XDB-C18 column (4.6 x 50 mm, 5 μm) with a linear gradient of 1%–99% B over 20 min, where the mobile phase consisted of solvent A (H2O with 0.05% formic acid) and solvent B (acetonitrile).
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3

Comprehensive Chemical Characterization

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All product characterization was based on liquid chromatography-mass spectrometric analyses. Low-resolution LC/ESI-MS was done using a Micromass Quattro-II (Waters) instrument on an analytical Agilent Eclipse XDB-C18 column (4.6 × 150 mm, 5 μm) with a linear gradient of 1% – 99% B over 20 min, where the mobile phase consisted of solvent A (H2O with 0.05% formic acid) and solvent B (ACN). High-resolution mass spectra were recorded using the same LC conditions on a Micromass Q-TOF Micro mass spectrometer (Waters) in positive ion mode. FT-ICR/MS was performed using a LTQ FT Ultra Hybrid Mass Spectrometer (Thermo Scientific) at the University of Utah Mass Spectrometry Core Facility. See Tables S3 and S4 for a complete list of all substrates, intermediates and products made in this study along with their expected masses.
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4

Synthesis and Characterization of Iron Hydrogenase Mimics

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Unless otherwise stated, reactions were conducted using standard Schlenk techniques, reagents were purchased from conventional sources, and solvents were HPLC grade and purified using an alumina filtration system (Glass Contour, Irvine, CA). ESI-MS data were acquired using a Waters Micromass Quattro II or ZMD spectrometer. Analytical data were acquired using an Exeter Analytical CE-440 elemental analyzer. NMR spectra were acquired with Varian U500 and VXR500 spectrometers. Chemical shifts (ppm) were referenced to residual solvent peaks (for 1H and 13C) or external 85% H3PO4 (for 31P). Solution IR spectra were recorded on a PerkinElmer Spectrum 100 FTIR spectrometer. Crystallographic data were collected using a Siemens SMART diffractometer equipped with a Mo Kα source (λ = 0.71073 Å) and an Apex II detector. Photolysis employed a Spectroline MB-100 instrument (365 nm). Syntheses of Fe(pdt)(CO)2(dppv)36 (link) and K[FeCp(CO)2]37 have been reported. CVs were simulated with the CHI630D package. EPR spectra were recorded on a Varian E-line E-12 Century series X-band CW spectrometer. Spectra were collected at room temperature with a microwave frequency of 9.30 GHz, 1 G modulation, and 20 mW microwave power. EPR spectra were simulated using the program SIMPOW6.38 Samples of [1]0 and [H1]0 were handled in a glovebox with the exclusion of chlorocarbons.
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