Standards of tryptophan, serotonin, and melatonin, as well as the Bis-Tris reagent, ABTS•+, 2,4,6-tripyridyl-s-triazine (TPTZ), fluorescein, 2,2′-azobis(2-methylpropionamidine) (AAPH), ferric (III) chloride hexahydrate, manganese (IV) oxide, and the standard 6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid (Trolox) were obtained from Sigma-Aldrich (Steinheim, Germany). The 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate (AQC) reagent was purchased from Chemos GmbH (Regenstauf, Germany). Formic acid, hydrochloric acid (37%), dipotassium hydrogen phosphate, sodium acetate, and ammonium acetate were purchased from Panreac Quimica S.A. (Castellar del Vallés, Barcelona, Spain). Boric acid was purchased from Probus (Badalona, Barcelona, Spain). All LC-MS-grade solvents were obtained from JT Baker (Phillipsburg, NJ, USA). Ultrapure water was produced using a Millipore water purification system (Darmstadt, Germany).
Manganese 4 oxide
Manufactured by Merck Group
Sourced in Germany, France, Sao Tome and Principe
Manganese(IV) oxide is a chemical compound with the formula MnO2. It is a dark brown to black solid that is the most stable oxide of manganese. Manganese(IV) oxide is commonly used as a laboratory reagent and in various industrial applications.
Automatically generated - may contain errors
Lab products found in correlation
Acetic acid, by Merck Group (2 mentions)
6 hydroxy 2 5 7 8 tetramethylchroman 2 carboxylic acid trolox, by Merck Group (1 mentions)
Water purification system, by Merck Group (1 mentions)
Lc ms grade solvents, by Avantor (1 mentions)
Ferric 3 chloride hexahydrate, by Merck Group (1 mentions)
Milli q system, by Merck Group (1 mentions)
Sodium hydroxide (naoh), by Merck Group (1 mentions)
Phosphoric acid, by Merck Group (1 mentions)
Boric acid, by Merck Group (1 mentions)
Hydrochloric acid (hcl), by Merck Group (1 mentions)
Triethylamine, by Merck Group (1 mentions)
Sodium dihydrogen phosphate dihydrate, by Carl Roth (1 mentions)
Formic acid, by Biosolve (1 mentions)
E 2 hexenal, by Merck Group (1 mentions)
Disodium hydrogen phosphate, by Carl Roth (1 mentions)
Dithiotreitol, by Merck Group (1 mentions)
Trifluoroacetic acid, by Carl Roth (1 mentions)
Sodium carbonate, by Carl Roth (1 mentions)
L glutathione reduced, by Merck Group (1 mentions)
Mesityl oxide, by Merck Group (1 mentions)
5 protocols using manganese 4 oxide
1
Comprehensive Analytical Standards Protocol
2
Electrochemical Analysis of Vitamin B2
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Boric acid, sodium hydroxide, acetic acid, phosphoric acid and manganese(IV) oxide (99.99 %, diameter approximately 5 μm), were purchased from Sigma–Aldrich (https://www.sigmaaldrich.com /) and used as received without any further purification. Calibration solutions were prepared from the stock solution (1 mM) by appropriate dilution with supporting electrolyte. Britton–Robinson buffer was prepared in usual way by mixing of 40 mM of all necessary components (phosphoric acid, acetic acid and Boric acid). The pH of different Britton–Robinson buffer was adjusted with sodium hydroxide (0.2 M).
Working solutions of vitamin B2 (VB2) were freshly prepared on the day of the experiment by appropriate dilution with the supporting electrolyte. All other chemicals were of analytical reagent grade. Deionized water with a resistivity of 18 MΩ cm (Millipore Milli-Q system) was used for the preparation of all the solutions.
Working solutions of vitamin B2 (VB2) were freshly prepared on the day of the experiment by appropriate dilution with the supporting electrolyte. All other chemicals were of analytical reagent grade. Deionized water with a resistivity of 18 MΩ cm (Millipore Milli-Q system) was used for the preparation of all the solutions.
3
Synthesis and Analysis of Sulfur Compounds
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UPLC/MS grade water, methanol and formic acid (>99.98%) were purchased from Biosolve Chimie, Dieuze, France; deuterium (99.8% D), dithiotreitol (98%), (E)-2-hexenal (98%), 2-hexyn-1-ol (≥97%), Boc-Cys-OH (≥98.5%), (Boc-Cys-OH)2 (≥98%), ethanol-OD (≥99%), hydrochloric acid (37%), L-glutathione reduced (98%), Lindlar catalyst, manganese(IV) oxide (≥99%), mesityl oxide (≥90%), mesityl oxide d10 (>98% D), triethylamine (≥99%) were purchased from Sigma-Aldrich, St Quentin Fallavier, France, and H-Cys-Gly-OH (98%), H-Glu(Cys-OH)-OH (98%)from Bachem, Bubendorf, Suisse; triethylsilane (≥98%) was obtained from TCI Europe, Zwijndrecht, Belgium; while di-sodium hydrogen phosphate (≥99%), sodium carbonate (≥99%), sodium dihydrogen phosphate dihydrate (≥99%)and trifluoroacetic acid (≥99.9%) were purchased from Carl Roth, Karlsruhe, Germany.
4
Synthesis of Polymer Electrolyte Membrane
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Poly(2,6-dimethyl-1,4-phenylene oxide) powder (PPO), 1-methylpyrrolidine (≥98%), and manganese (IV) oxide (5 μm, 99.99%) were supplied by Sigma-Aldrich (St. Louis, MO, USA). N-bromosuccinimide (NBS) for synthesis, benzoyl peroxide (BPO, with 25% H2O), and chlorobenzene were purchased from Merck Millipore. 1-methyl-2-pyrrolidinone (NMP), ethanol, methanol, and toluene all with Grade AR were purchased from QRëC (New Zealand). N,N-dimethylformamide (DMF) (LOBA Chemie, Grade AR, Mumbai, India), trimethylamine (TCI, ca. 25% in methanol), 1-methylimidazole (TCI, ≥99%), chloroform (BDH Chemicals, UK), and KOH plates (Kemaus, Australia) were used as received without further purification. Nickel (Ni) foam as cathode current collector with a purity of 99.97%, 100 pores per inch (PPI), and 1 mm thick was purchased from Qijing Trading Co., Ltd. (Wenzhou, China). Carbon black (Vulcan® XC-72, Cabot Corporation, Boston, MA, USA), BP-2000 (BLACK PEARLS® 2000, Cabot Corporation), and zinc plate (0.1 mm thick 99.99%, Shandong Yr Electronic Co., Ltd., Shandong, China) were used as received. Poly (styrene-co-butadiene) (Sigma-Aldrich, butadiene 4 wt%) was used to prepare binder for the cathode. Poly(vinyl acetate) (PVAc) from TOA Paint Public Co., Ltd. (Samut Prakarn, Thailand) and No. 4 Whatman filter paper (Sigma-Aldrich) were used to prepare the benchmark separator.
5
Analytical Reagents and Materials Protocol
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High purity water (18.2 MΩ•cm) was obtained with an Elga Purelab-UV system (Veolia Environment, Paris, France). TraceCERT® nitric acid (HNO3, 69%), sulphuric acid (H2SO4, ACS reagent 95-98%) iridium (analytical standard, 1000 mg/L Ir in 10 wt. % HCl), ammonium nitrate (NH4NO3 99.999% trace metals basis), diethylenetriaminepentaacetic acid (DTPA), hydrogen peroxide (H2O2, 30%), acetic acid, sodium hypochlorite (NaClO, available chlorine 10-15%), ammonium fluoride (NH4F), and manganese(IV) oxide (MnO2 50 wt.% on activated carbon) were purchased from Sigma-Aldrich. Arsenic(V) standard solution and ammonium iron(III) sulphate salt were purchased from Carlo Erba (Italy). Standard solutions of Tl(I) were prepared by dilution of 1000 mg/L Tl in 0.5 mmol/L HNO3 (Merck) in the eluent phase. Standard solution of Tl(III) was prepared dissolving Tl(NO3)3•3H2O (Sigma-Aldrich) in 5 mmol/L HNO3 -5 mmol/L DTPA. For colorimetry of iron(II), 2,4,6-tris(2-pyridyl)-s-triazine (TPTZ, ≥98%) obtained from Sigma-Aldrich was used as the complexing reagent. PTFE filters (4 mm thickness and 0.20 μm pore diameter, Sigma Aldrich) were chosen for the filtration.
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