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N methyl pyrrolidone (nmp)

Manufactured by Thermo Fisher Scientific
Sourced in United States, United Kingdom

The NMP is a lab equipment product designed for use in various scientific applications. It serves as a core function for conducting research and experiments. The details of its intended use and specific applications are not included in this factual and unbiased description.

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37 protocols using n methyl pyrrolidone (nmp)

1

Graphene Nanosheets Synthesis via Exfoliation

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Graphene nanosheets (3-4 layers, ~500 um surface diameter) were prepared via water-assisted liquid phase exfoliation of graphite. Briefly, 50 mg microcrystalline graphite powder (325 mesh, 99.995% pure, purchased from Alfa Aesar, UK) was immersed in N-methyl-2-pyrrolidone (NMP) mixture with a 0.2 mass fraction of water. The initial concentration of graphite was fixed at 5 mg mL -1 for exfoliation. NMP, 99% extra pure was purchased from Acros Organics (USA). The materials were batch sonicated for 6 hours in a bath sonicator (Elma sonic P60H, Switzerland) at a fixed nominal power and frequency of 100 W and 37 kHz respectively. Sample dispersions were hanged on for overnight in between sonication and centrifugation and were centrifuged at 3000 rpm for 30 minutes using a Hettich EBA20 centrifuge (Germany). The upper 75% of the colloidal supernatant were collected and dried in an oven to yield the graphene nanosheets.
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2

Fluorescent Peptide Labeling Protocol

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The Cy3 fluorophore (4 eq; 4 μmol in NMP, ThermoFischer Scientific) was mixed with HCTU (4 eq; 4 μmol) and NMM (10 eq; 10 μmol) in NMP. Notably, 1 μmol of peptide on resin was added (300 rpm stirring; 2 h; room temperature). Notably, 3 × 5 mL washes with NMP then 3 × 5 mL washes with DCM were carried out. The peptide on resin was dried under vacuum, cleaved from the resin and deprotected.
0.3 μmol of peptide cleaved from the resin, deprotected, purified and freeze-dried was taken up in DMF. N,N-diisopropylethylamine (DIPEA, Sigma Aldrich, 10 eq.) was added, then the Cy5 fluorophore (Lumiprobe, 5 eq.), with stirring at 250 rpm for 1.5 h at 37 °C. TRIS (pH 7.8; 50 mM) was added (250 rpm stirring; 20 min).
Both Cy3-AngII and Cy5-AngII were purified by HPLC and analyzed by mass spectrometry. After lyophilization, peptides were resolubilized in H2O.
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3

Formulation and characterization of bedaquiline

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Bedaquiline fumarate salt and purified water originated from Janssen Pharmaceutica NV (Beerse, Belgium). P338 and P407 were bought from BASF (Mannheim, Germany) and PEG400 from Clariant (Frankfurt am Main, Germany). NMP was obtained from Acros Organics (New Jersey, USA). Water for injections was sourced from Baxter (Lessines, Belgium) or Sterop Laboratoria (Brussels, Belgium). All other chemicals were of reagent grade and purchased from commercial sources.
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4

Fabrication of Lithium-ion Battery Electrodes

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Commercially available battery materials were sourced directly from the suppliers, including: active material LiNi1/3Co1/3Mn1/3O2, NMC (5 to 25 μm particle size, Targray, Canada) and electrical conductivity enhancer carbon black, CB (100 to 300 nm particle size, 75 m2 g−1 specific surface area, Alfa Aesar, United Kingdom). An aprotic solvent N‐Methyl‐2‐pyrrolidone, NMP (≥99.5 %, Acros Organics, UK) was selected as the media for EPD experiments, because of its low volatility, high chemical stability, its exceptionally high surface tension (>40 mJ m−2) and highly polar nature that ensure a stable suspension of colloids. A related reason is that NMP is recyclable by distillation, biodegradable and is used as the solvent of choice in slurry casting of Lithium‐ion battery electrode. Cationic polyelectrolyte Poly(diallyldimethylammonium chloride), PDDA (20 wt. % in H2O, Sigma Aldrich, UK) was used as a dispersant and charging agent. PDDA was chosen because it contains strong cationic and activated adsorbent group radicals which can destabilize and flocculate suspended solids through electro‐neutralization and bridging adsorption.15, 16 All materials and chemicals were used as received without further processing.
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5

Activated Carbon from Waste Denim Supercapacitor

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Waste jean with 68% cotton, 30% polyester, and 2% of elastane composition was used as the raw material to produce AC. Potassium hydroxide (KOH, Merck) was the activating chemical. 1 M sulfuric acid (H2SO4, Riedel-de-Haen) was employed as aqueous electrolyte. Conductive carbon black (CB, TIMCAL Super C45), polyvinylidene fluoride (PVDF, Sigma-Aldrich), and n-methyl-2-pyrrolidone (NMP, Acros Organics) were the chemicals used to assemble supercapacitor electrodes.
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6

High-Performance Lithium-Ion Anode Fabrication

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Anodes were fabricated by preparing inks containing 80 wt% active material, 10 wt% carbon black (Vulcan XC-72R, Cabot) as the conducting agent, and 10 wt% binder, made by dispersing polyvinylidene fluoride (PVDF, Kynar blend) in N-methylpyrrolidone (NMP, Acros, 99.5% Extra Dry). The inks were homogenized through repeated and successive sonication and stirring, coated onto a copper foil (Alfa Aesar, 99.999%), dried at 100 °C under vacuum for 12 h, then pressed at 1500 lbs for 5 min. For all electrodes fabricated in this study, the active loading was 0.2–0.8 mg active material/cm2. Coin cells were assembled to test the electrochemical properties of anodes in a half-cell configuration. Coin cells (2 cm in diameter, Hohsen Corp.) were assembled in an argon-filled glovebox (Labconco) with the anodes as the working electrode, lithium metal (Alfa Aesar, 99.9%) as both the counter and reference electrode, Celgard 2320 tri-layer PP/PE/PP as the separator, and a mixture of 1 M lithium hexafluorophosphate (LiPF6, Acros 98%) in (1:1:1 vol) ethylene carbonate (EC, Acros 99+%):dimethyl carbonate (DMC, Acros 98+%):diethyl carbonate (DEC, Acros 99%) as the electrolyte.
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7

Polyamide Thin-Film Composite Membranes

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All materials were used as received unless otherwise noted. 3,3′-Dihydroxybenzidine (HAB, 99%) was purchased from TCI America, Inc. Calcium chloride (CaCl2, anhydrous, 96%), terephthaloyl chloride (TPC, flakes, 99%) and isophthaloyl chloride (IPC, flakes, 99%) were acquired from Sigma-Aldrich. TPC and IPC were sublimed at 80 °C and stored under nitrogen before use. NMP (extra dry over molecular sieves, 99.5%) was purchased from Acros Organics. HCl (ACS plus, 36.5–38 wt %) and NaOH solution (50/50 w/w %) were purchased from VWR International. The polysulfone (PSf) support layer with polypropylene (PP) backing (PS-20 GPP) used for preparing the TFC membranes was kindly donated by Solecta, Inc. (Oceanside, CA). Sodium chloride (NaCl), magnesium sulfate (MgSO4), and calcium chloride (CaCl2) for salt rejection measurements were purchased from Alfa Aesar, Mallinckrodt Pharmaceuticals, and Fisher Scientific, respectively. Poly- (ethylene glycol) (PEG, analytical standard) 200, 400, 600, and 1000 g mol−1 for MWCO experiments were sourced from Agilent. PEG (2000 g mol−1, analytical standard) was sourced from Sigma-Aldrich.
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8

Formulation of Bedaquiline-Loaded PLGA Microspheres

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bedaquiline fumarate salt and 6-deuterium-labelled bedaquiline were manufactured internally at Janssen. PLGA5050A (L/G ratio 50/50, acid terminated, inherent viscosity (IV) 0.48 dL/g), PLGA7525A (L/G ratio 75/25, acid terminated, IV 0.48 dL/g), PLGA7525E (L/G ratio 75/25, ester terminated, IV 0.35 dL/g), PDLLA (poly(d,l-lactide), acid terminated, IV 0.71 dL/g), lactide, and glycolide were sourced from Ashland (Covington, KY, USA). Polyethylene glycol 400 (PEG400) was purchased from Clariant (Frankfurt am Main, Germany). NMP was sourced from Acros Organics (Geel, Belgium) and water for injections from Sterop Laboratoria (Brussels, Belgium) or Baxter (Lessines, Belgium). All other chemicals were purchased from commercial sources as reagent grade.
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9

Synthesis and Characterization of ITZ Analogues

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Starting materials were purchased from Sigma-Aldrich or Fisher Scientific. ACS grade methanol, ethyl acetate, toluene, anhydrous DMF, NMP, and DMSO were purchased from Fisher Scientific or Sigma-Aldrich. ITZ analogue 9 was purchased from Toronto Research Chemicals. All reactions were run under an argon atmosphere. NMR data was collected on a Bruker AVANCE 500 MHz spectrometer and analysis performed using MestReNova. HRMS data was analyzed at the Mass Spectrometry Facility at the University of Connecticut by Dr. You-Jun Fu. FT-IR analysis was performed on a Bruker Alpha Platinum ATR instrument using OPUS software (v 7.2). The preparation of previously characterized ITZ intermediates followed known procedures with minor modifications.24 (link)-26 (link),32 (link) X-ray crystals were prepared using vapor diffusion techniques (pentanes:chloroform) and analysis performed by Dr. Victor Day at the Small-Molecule X-ray Crystallography Lab at the University of Kansas on a Bruker MicroStar microfocus Cu rotating anode generator with two CCD detectors or a Bruker Apex II CCD detector equipped with Helios multilayer optics instruments. Mercury (v3.0) software was used to visualize X-ray structural analysis. All ITZ analogues evaluated in the biological assays (1-25) were greater than 95% pure based on the HPLC methods described below.
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10

Humanized Mouse Model of Immune Response

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Human PBMCs were isolated from blood samples collected from healthy adult donors (two donors total) under an institutional review board (IRB) approved protocol (Temple University). 20 million human PBMCs were injected (i.p.) on day 0 into 8–10-week-old female randomly assigned NSG mice. 20mg/kg MC180295 were injected (i.p.) every other day for 12 days and whole blood was collected on day 14 followed by flow cytometry analysis.
MC180295 was dissolved in NMP (Fisher Scientific), Captisol (20% w/v) (CyDex), PEG-400 (Millipore Sigma) and normal saline (PBS) (Corning) in a ratio of 1:4:4:11. NMP first, followed by Captisol and PEG-400. PBS was added last.
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