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Potassium bromide

Manufactured by Thermo Fisher Scientific
Sourced in United States, Belgium

Potassium bromide is a crystalline compound used as a laboratory reagent. It has the chemical formula KBr and is commonly used as a salt in infrared spectroscopy applications.

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16 protocols using potassium bromide

1

Synthesis of Organic Compounds Using Common Reagents

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Anhydrous dichloromethane (DCM) and tetrahydrofuran (THF) were purchased from Sigma Aldrich. Absolute ethanol was obtained from Decon Laboratories. Diethyl ether (Et2O), methyl tert‐butyl ether (MTBE), and sodium azide were purchased from Fisher Scientific. Triethylamine (NEt3) and methanesulfonyl chloride (MsCl) were obtained from Acros and distilled from CaH2 and P2O5, respectively. Trifluoroacetic acid (TFA) was purchased from Oakwood Products. Pearlman's catalyst (Pd(OH)2/C), 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPO), phenylacetylene (PA), diphenylacetylene (DPA), dimethyl acetylenedicarboxylate (DMAD), and diethyl acetylenedicarboxylate (DEBD) were purchased from Sigma Aldrich and used as received. Potassium bromide and di‐tert‐butyl dicarbonate ((Boc)2O) were purchased from Acros and used as received.
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2

Evaluating Homologues and Hold-up Markers

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The injected series of homologues (n-alkyl benzenes, n-alkyl phenones, and n-alkyl ketones) and the hold-up volume markers candidates (acetone, urea, dimethyl sulfoxide (DMSO), N,N-dimethylformamide (DMF), formamide, thiourea, uracil, potassium bromide, and lithium nitrate) were purchased from Acros Organics (Geel, Belgium), Alfa Aesar (Ward Hill, MA, USA), Baker, Carlo Erba (Emmendingen, Germany), Fluka (Buchs, Switzerland), Merck, Prolabo (Sion, Switzerland), and Sigma-Aldrich (St. Louis, MO, USA), all of high purity grade (≥97%). Stock solutions of the injected analytes were prepared in methanol at a concentration of 5 mg mL−1 except for inorganic salts, which were dissolved in water. n-Alkyl ketones were injected at stock solution concentration because of their low UV-Vis absorbance, but the rest of the analytes were diluted to 0.5 mg mL−1 before injection.
Water was obtained from a Milli-Q plus system from Millipore (Billerica, MA, USA) with a resistivity of 18.2 MΩ cm. Acetonitrile and methanol were HPLC gradient grade and from Labkem (Dublin, Ireland) and Chem-Lab (Zedelgem, Belgium).
Ammonium acetate (Sigma-Aldrich, >98%) was used in the evaluation of the effect of salt concentration in Acetonitrile/water mobile phases, in a range between 5 and 20 mM.
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3

Microcrystalline Cellulose Surface Modification

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Microcrystalline cellulose (Acros, Fair Lawn, NJ, USA), sulfuric acid (96.2%, Fisher Scientific, Fair Lawn, NJ, USA), sodium hydroxide (97%, Fisher Scientific), sodium chloride (99%, Fisher Scientific), anthraquinone-2-carboxylic acid (99%, Tokyo Chemical Industry CO., Tokyo, Japan), N,N’-carbonyldiimidazole (CDI) (98%, Oakwood Chemical, Estill, SC, USA), N,N-dimethylformamide (DMF) (99.9%, Sigma-Aldrich, Saint Louis, MO, USA), dimethyl sulfoxide (DMSO) (99.9%, Sigma-Aldrich), magnesium sulfate (97%, Sigma-Aldrich), potassium bromide (99%, Acros), poly-L-lysine solution (0.1 w/v in H2O, Sigma-Aldrich), and ethyl alcohol (95%, Sigma-Aldrich) were used as received without any further purification. Muscovite mica pieces were mechanically peeled to reveal fresh (0001) surfaces before use. AC240TS-R3 silicon cantilevers were purchased from Oxford Instruments (Santa Barbara, CA, USA). Asylum Research Water (≥18.2 MΩ) was purified using a Milli-Q system (Q-GARD 2, MilliporeSigma, Darmstadt, Germany).
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4

Lipoprotein Isolation from Plasma

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Plasma from human donors was purchased from the centre of blood donation Etablissement Francais du Sang; EFS Besancon. Samples were obtained from 10 different donors, and each sample was used for the preparation of the three types of lipoproteins. Cyclosporine A and bovine serum albumin (BSA) were purchased from Sigma Aldrich in France (St. Quentin Fallavier). Potassium bromide was bought from Acros Organics in Belgium (Geel). Tubes for ultracentrifugation, Bottle with Cap Assembly, Polycarbonate, 26.3 mL, 25 × 89 mm were obtained from Beckman, UK (High Wycombe). Amicon Ultra 30 K Centrifugal Filter Devices were purchased from Merck Millipore in Germany (Darmstadt). Assay kits for the determination of total cholesterol, free cholesterol and triglycerides were obtained from DiaSys diagnostics, France (Grabels). BCA and micro-BCA assay kits for the determination of protein concentrations were purchased from Pierce, Fischer-Thermo Scientific, France (Artenay).
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5

Synthesis of 4-(bromomethyl)benzoic Acid Derivative

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Cotton wool, hydrochloric acid (37%, extra pure), sodium hydroxide (99%, p.a., ISO, in pellets), pyridine (99%, for synthesis) and dichloromethane (99.5%, for synthesis) were purchased from Carl Roth. Sulfuric acid (95%, RECTAPUR), 4-(bromomethyl)benzoic acid (97%, Alfa Aesar), p-toluenesulfonyl chloride (98%, Alfa Aesar) and ethanol (absolute, EMPLURAR ) were purchased from VWR International. N,N-Dimethylformamide (99.8%, Extra Dry over Molecular Sieves, AcroSeal®), Imidazole (99%), potassium bromide (IR spectroscopy grade) and Amberlite® MB-6113 (for ion chromatography, mixed resin) were purchased from Acros Organics.
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6

Synthesis of Palladium Nanoparticles

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Sodium tetrachloropalladate(II)
(Na2PdCl4, 99.998%), poly(vinylpyrrolidone)
(PVP, Mw ≈ 55 000), and ascorbic acid (AA) were all
ordered from Sigma-Aldrich. Potassium chloride (KCl) and potassium
bromide (KBr) were purchased from Fisher Scientific. Deionized water
with a resistivity of 18.2 MΩ·cm at room temperature was
employed in all experiments.
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7

Synthesis and Characterization of Potassium Ferrate

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Ultrapure water (18.2 MΩ•cm) was obtained from a Milli-Q Element A10 water purification system. Suwannee River NOM (SRNOM, 2R101N) and Suwannee River humic acid (SRHA, 3S101H) were purchased from the International Humic Substances Society. Solid potassium ferrate (K2FeO4) was chemically prepared based on previous studies (Yang et al., 2015 ; Dong et al., 2019 (link)). Stock solutions of Fe(VI) were freshly prepared by dissolving K2FeO4 in ultrapure water before each experiment, and Fe(VI) concentration was quantified with the absorbance at 510 nm (absorption coefficient 1150 M−1 cm−1). HF Mega Bond Elut C18 cartridges (1 g, 6 mL) were ordered from Agilent Technologies. Lead(IV) oxide (> 97%, extra pure, ACROS Organics) were ordered from Fisher Chemical (Hampton, NH, USA), and it has been identified as pure plattnerite (β-PbO2) by X-ray Diffraction in a previous study (Xie et al., 2010 (link)). Other chemicals and reagents, including potassium iodide (KI, 99+%, ACS reagent), potassium bromide (KBr, 99+%, for spectroscopy, IR grade), nitric acid (trace metal grade), and methanol (Optima LC/MS grade) were purchased from Fisher Chemical (Hampton, NH, USA).
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8

Synthesis and Characterization of Fluorescent Nanoparticles

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Cetyltrimethylammonium bromide (CTAB), fluorescein isothiocyanate (FITC), and tetraethoxysilane (TEOS) were obtained from Acros Organics Ltd. (Geel, Belgium). Potassium bromide was acquired from Fisher Scientific Ltd. (Loughborough, UK). Sulforhodamine B (SRB), ammonium nitrate (NH4NO3), N-(3-triethoxysilylpropyl)-4,5-dihydroimidazole, MB, and 2′,7′-dichlorofluorescin diacetate (DCFH-DA) were purchased from Sigma. Co. Ltd. (St. Louis, MO, USA). Copper sulfate was obtained from Showa Chemical Co. Ltd. (Gyoda, Japan). DMEM medium and Fetal bovine serum (FBS) were acquired from GIBCO/BRL Life Technologies (Grand Island, NE, USA). The comet assay kit was obtained from R&D systems (Minneapolis, MN, USA). Diamidino-2-phenylindole dihydrochloride (DAPI) and rhodamine-phalloidin were purchased from Invitrogen Ltd. (Eugene, OR, USA).
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9

Synthesis of Stable Silver Nanoprisms

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Silver nanoprisms were prepared
by a chemical reduction method as previously described.41 ,44 Solutions were added to a 25 mL Erlenmeyer flask in the following
order: 2.0 mL of 12.4 mM sodium citrate tribasic (Sigma-Aldrich 99.0%),
5.0 mL of 0.375 mM silver nitrate (Sigma-Aldrich 99.9999%), and 5.0
mL of 50 mM hydrogen peroxide (Fisher Scientific). Then, 25 μL
of 1 mM potassium bromide (Fisher Scientific) was added using a micropipette.
Lastly, 2.5 mL of fresh 5 mM sodium borohydride (J.T. Baker 98%) was
added. The flask was covered and shaken to mix the reactants. After
formation of the nanoprisms, the solution of nanoprisms was blue in
color and stable for several weeks.
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10

Spectroscopic Characterization of Dye-Sensitized NiO

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The ultraviolet-visible (UV-vis) absorption spectra of the dye-catalyst assemblies in solution and adsorbed on nanostructured NiO films were recorded using a Shimadzu 1800 UV-vis spectrophotometer. The infrared spectra were measured on a Varian FTS 800 FT-IR spectrometer. Solid samples of sensitised NiO films were removed from the FTO substrate with a spatula and were mixed with potassium bromide (99%, spectroscopic grade, Fisher Scientific) using a pestle and mortar and pressed into disks.
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