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12 protocols using nexera x2 lc system

1

Quantifying Plasma CP-I and CMPF

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Plasma CP‐I and CMPF concentrations were measured simultaneously according to the methods reported by Suzuki et al.
17 (link) Briefly, Oasis MAX μElution Plate (Waters) was used to pretreat 250 μL of plasma by solid phase extraction. The extract was analyzed by ultra‐high‐performance liquid chromatography coupled to tandem mass spectrometry using the Nexera X2 LC system coupled to LCMS−8040 Liquid Chromatograph Mass Spectrometer (Shimadzu) equipped with electrospray ionization. The 15N4‐CP‐I and CMPF‐d5 were used as internal standards for CP‐I and CMPF, respectively. CP‐I was measured with (M + H)+ signal in positive ion mode, and CMPF was measured with (M – H) signal in negative ion mode. The tandem mass spectrometry transitions monitored were mass‐to‐charge ratio (m/z) 655.4 → m/z 596.3 for CP‐I, m/z 659.3 → m/z 600.3 for 15N4‐CP‐I, m/z 239.0 → m/z 195.2 for CMPF, and m/z 244.2 → m/z 200.2 for CMPF‐d5. The assays were validated in accordance with the US Food and Drug Administration Guidance for Bioanalytical Method Validation.
20 The lower limit of quantification was 0.1 ng/mL for CP‐I and 50 ng/mL for CMPF. The within‐batch accuracy of the assay ranged from 92.1% to 110.2% for CP‐I, and from 99.1% to 109.3% for CMPF. The within‐batch precision was less than 7.6% for CP‐I and 3.4% for CMPF.
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2

LCMS Sample Preparation for Brain Lipids

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For LCMS sample preparation, 10 mg of brain powder prepared from whole‐brain–powered homogenates was mixed with 400 ml of methanol spiked with internal standards and homogenized with a 3 mm tungsten carbide bead (shaken at 25 Hz for 30 s). The methanol fraction was then isolated via centrifugation (20 min at 4°C, 14,000 g, followed by transfer of supernatant to a 96‐well plate, and 1 h incubation at −20°C followed by an additional 20 min centrifugation (4,000 g at 4°C)) and transferred to glass vials for LCMS analysis. For analysis of a GlcCer/GalCer panel, an aliquot of the methanol fraction was dried under N2 gas and then resuspended in 100 ml of 92.5/5/2.5 CAN/IPA/H2 (MS grade) with 5 mM ammonium formate (MS grade) and 0.5% formic acid (MS grade).
Unless otherwise noted, relative quantification of lipids and metabolites was performed using the Shimadzu Nexera X2 LC system (Shimadzu Scientific Instrument) coupled to Sciex QTRAP 6500+ mass spectrometer (Sciex).
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3

High-Resolution Mass Spectrometry Proteome Analysis

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Samples were digested and reduced as previously described following recovery by affinity capture. High resolution mass spectrometry was performed on an Orbitrap Hfx attached to a Shimadzu Nexera X2 LC system. Column temperature was set to 40°C. Flow rate was set to 300μL/min. The aqueous solvent (A) was 0.1% (v/v) formic acid in water, and the organic phase (B) was 0.1% (v/v) formic acid in 100% methanol. The gradient started at 5% B and was held for 2 min before being increased to 90% B over 80 min. It was held at 90% B for 4.0 min before returning to 5% B over 2 min, where the column was allowed to re-equilibrate for 1 min. Overall run time was 88 min. The Orbitrap Hfx was operated using a top-10 DDA method. MS scans were performed across a range from 100-1500 m/z at a resolution of 60000. The maximum ion accumulation time was set to 100ms with an AGC target of 3e6. MS/MS scans were performed at a resolution of 30000 with a maximum ion accumulation time of 100ms and an AGC target of 1e5. Nominal collision energy was set to 32 volts. Dynamic exclusion was set to 3 sec using a 4 m/z isolation window. Spray voltage was 3000 volts. Capillary temperature was 360°C. Sheath gas and auxiliary gas were set to 50 and 20 units respectively. The data was searched against the Uniprot database and a Bungarus specific database from NCBI using proteinpilot software.
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4

Quantification of Bile Acids and Bilirubin in Plasma

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Total and D‐BIL were quantified as reported previously by enzymatic methods using Iatro LQ T‐BIL and Iatro LQ D‐BIL (LSI Medience, Tokyo, Japan), respectively, according to the manufacturer's protocols, as describe previously.16Other compounds, except for GCDCA‐S, GDCA‐S, GCDCA‐G and GDCA‐G, in the plasma samples were analyzed using LC‐MS/MS. Plasma samples were prepared by protein precipitation as described previously.17 Chromatography was performed on a Prominence LC system, or Nexera X2 LC system (Shimadzu, Kyoto, Japan). Liquid chromatographic conditions were summarized in Supplemental Methods. Note that we modified chromatographic conditions for the bile acids16, 17 to separate the stereoisomers. Data were collected on an AB Sciex API5500 (QTRAP) mass spectrometer (Foster City, CA) operated in electrospray ionization mode. The multiple reaction monitoring precursor/product ion transitions are summarized in Supplemental Methods.
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5

UPLC-MS/MS Quantitative Analysis Protocol

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Chromatographic analysis was performed on a Shimadzu Nexera X2 ® LC system coupled with a LC-8050 ® tandem mass spectrometer (Shimadzu, Kyoto, Japan). Chromatographic separation was performed on an Acquity UPLC BEH C18 column, m; Waters, Milan, Italy) maintained at 50°C through the column oven.
Compounds separation was obtained through a gradient (Table 1) of mobile phases A (Ammonium acetate 5mM buffer, ph 9,5) and B (ACN) at flow rate of 0.4 mL/min and a time run of 5 minutes.
Auto-sampler was settled at 4°C and the injection volume was 0.3 µL, with a sampling rate of 1 Data processing and system control was managed through the LabSolution ® software (Shimadzu, Kyoto, Japan) version 1.0.
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6

HPLC Analysis of Pharmaceutical Degradation

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The Shimadzu Nexera X2 LC system (Shimadzu Corporation, Kyoto, Japan) equipped with a photodiode array detector was used for HPLC analysis. An ACQUITY Ultra Performance LC (UPLC) BEH C8 column (2.1 mm i.d. × 75 mm, 1.7 µm particle size, Waters Corporation, Milford, MA, U.S.A.) was used as the analytical column. ) based on a previous report. 21) (link) The degradation rates were determined from the slopes of the degradation amount versus time plots for each condition. Experimental Ln k data were fit with a linear combination of temperature (-1/T), %RH, and % (w/w) MgSt variables to give the calculated formula using multiple regression with standard least squares fitting and effect leverage.
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7

Purity Analysis of LNnT by LC-MS

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Example 12

For LC-MS analysis to determine purity of LNnT with respect to the dry mass a Nexera X2 LC system (Shimadzu, Kyoto, Japan) was used, which included a LC-30AD pump, an autosampler SIL-30AC, a LCMS-8050 mass spectrometer (ESI-MS detector), a xBridge BEH Amide 3.5 μm, 50×2.1 mm column (Waters, Eschborn, Germany) and a xBridge BEH Amide 3.5 μm pre-column (Waters, Eschborn, Germany). The solvent contained 60% acetonitrile, 39.9% ddH2O and 0.1% NH4OH and the flow rate was set to 0.3 mL/min. All analyses were performed with the solvent isocratically at 35° C. Lacto-N-neotetraose was purchased from OligoTech (Crolles, France) and used as internal standard.

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8

Quantification of Creatinine and 1-NMN

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Plasma and urine samples analyzed by liquid chromatography with tandem mass spectrometry were prepared by protein precipitation as described previously.27 All compounds were separated and detected using the QTRAP5500 system (AB SCIEX, Toronto, Canada) equipped with the Nexera X2 LC system (Shimadzu, Kyoto, Japan), operated in electrospray ionization mode. Analyte quantification was performed using Analyst version 1.7 (Sciex, Toronto, ON, Canada). Creatinine and 1‐NMN were analyzed using creatinine‐d3 and 1‐NMN‐d3 as internal standards, respectively. The conditions of liquid chromatography, multiple reaction monitoring precursor/product ion transitions are summarized in Supplementary Methods.
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9

Targeted Metabolite Quantification in Serum

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For quantitative analyses, serum samples were mixed with L-glutamine-13C5, [Tyr]-human FPA, uric acid-1,3–15N2, LPC 16:0-d31, and 4PY (internal standards). Varying amounts of standards were spiked into bovine serum albumin solutions in the presence of the internal standard, and extracted. MS analyses were performed using a Triple TOF 5600+ system (SCIEX) fitted with an analyst data acquisition module. The positive ion multiple reaction monitoring (MRM) mode was used for quantitative analysis of L-glutamine, LPC 16:0, LPC 18:0, 2PY, and FPA. Sample extracts (5 μL) were loaded via a Nexera X2 LC system (Shimadzu) onto a three-step linear gradient (solvent A, 0.1% [v/v] FA in water; solvent B, 100% ACN; 1% solvent B for 1.5 min, 1–25% B for 4.5 min, 25–45% B for 2 min, 45–90% B for 2 min, 90% B for 4 min, 90–1% B for 0.5 min, and 1% B for 5.5 min). The negative ion MRM mode was used for quantitative analysis of uric acid levels. LC separations (10 min/sample) were performed using a one-step linear gradient (solvent A, 0.1% [v/v] FA in water; solvent B, 100% ACN; 1% solvent B for 1.5 min, 1–90% B for 2.5 min, 90% B for 2 min, 90–1% B for 0.5 min, and 1% B for 3.5 min). The six metabolites were quantified with the aid of MultiQuant software (SCIEX).
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10

LC-MS/MS Quantification of Biological Analytes

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Plasma and urine samples analyzed by liquid chromatography‐tandem mass spectrometry (LC‐MS/MS) were prepared by protein precipitation, as described previously14 with minor modification. All compounds were separated and detected using the QTRAP5500 system (AB SCIEX, Toronto, Canada) equipped with a Nexera X2 LC system (Shimadzu, Kyoto, Japan), operating in electrospray ionization mode. Analyte quantification was performed using Analyst version 1.7 (Sciex, Toronto, Canada). The conditions of liquid chromatography, multiple reaction monitoring precursor/product ion transitions are summarized in Supplementary Methods.
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