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Q exactive plus mass spectrometry system

Manufactured by Thermo Fisher Scientific
Sourced in United States

The Q Exactive Plus mass spectrometry system is a high-resolution, accurate-mass (HRAM) instrument designed for a variety of analytical applications. It combines a quadrupole mass filter with a high-field Orbitrap mass analyzer to provide high-quality data for qualitative and quantitative analysis.

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2 protocols using q exactive plus mass spectrometry system

1

Quantitative Serum Proteomics by TMT-Based Profiling

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Serum samples from every 10 patients were mixed into one pooled sample for TMT-based quantitative proteomics detection by TMT10plex™ Isobaric Label Reagent Set as previously reported and the schematic representation of the study flow was shown in Fig. 1 [25 (link)]. Benefits of the TMT 10-plex include increased sample multiplexing, improved confidence for the identification and quantification of proteins, and better sample throughput [28 (link)]. The serum proteomic profiling was performed at the GeneChem Co., Ltd. (Shanghai, China) using the Easy nLC chromatographic system and Q Exactive Plus mass spectrometry system (Thermo Fisher Scientific, USA). The detailed experimental procedures are described in the Supplementary Materials and Methods.

Schematic representation of the experimental workflow for protein profiling of serum samples.

Fig. 1
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2

Quantitative Proteomics via Nano-HPLC-MS/MS

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The samples were injected onto a PepMap RSLC C18 column (Thermo Scientific) with an Easy nano HPLC coupled to a Q-Exactive Plus mass spectrometry system (Thermo Scientific) at a flow rate of 300 nl/min with a 25 min 0-40% acetonitrile gradient in 0.1% formic acid followed by a 3 min gradient to 80% acetonitrile. Spectra were recorded with a resolution of 35,000 in the positive polarity mode over the range of m/z 350–2,000 and an automatic gain control target value was 1x106. The 10 most prominent precursor ions in each full scan were isolated for higher energy collisional dissociation-tandem mass spectrometry (HCD-MS/MS) fragmentation with normalized collision energy of 35%, an automatic gain control target of 2x105, an isolation window of m/z 3.0, dynamic exclusion enabled, and fragment resolution of 17,500.
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