Iron(III) chloride hexahydrate (FeCl3·6H2O), iron(II) sulfate heptahydrate (FeSO4·7H2O), Triton X-100, cyclohexane, 1-pentanol and tetramethylammonium hydroxide solution (TMAH) were supplied by Sigma-Aldrich (St. Louis, MO, USA). The sample preparation was based on the micro-emulsion method described by Yang et al. [27 (link)] and Gotić et al. [15 (link)]. The first microemulsion contained 0.5 mL aqueous solution of the iron salts (0.075 mol/L FeCl3, 0.05 mol/L FeSO4), 14 mL cyclohexane, 1.5 mL Triton X-100 and 0.5 mL 1-pentanol. The second microemulsion contained 0.5 mL aqueous solution of TMAH (1 mol/L) and again 14 mL cyclohexane, 1.5 mL Triton X-100 and 0.5 mL 1-pentanol. From each microemulsion, 1 mL was mixed creating the final 2 mL sample with a pH value between 12 and 13. This sample was bubbled for several minutes with nitrogen in order to remove oxygen.
Tetramethylammonium hydroxide tmah solution
Manufactured by Merck Group
Sourced in United States, Germany
Tetramethylammonium hydroxide (TMAH) solution is a quaternary ammonium compound used in various laboratory applications. It is a clear, colorless liquid with a characteristic odor. TMAH solution is a widely used developer in the semiconductor industry for photolithography processes.
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Lab products found in correlation
Triton x 100, by Merck Group (2 mentions)
Oleic acid, by Merck Group (2 mentions)
1 pentanol, by Merck Group (1 mentions)
Cyclohexane, by Merck Group (1 mentions)
Ammonium hydroxide solution, by Merck Group (1 mentions)
Iron 2 chloride hexahydrate, by Merck Group (1 mentions)
Cetyltrimethylammonium bromide, by Thermo Fisher Scientific (1 mentions)
Iron 3 chloride hexahydrate, by Thermo Fisher Scientific (1 mentions)
Na citrate, by Merck Group (1 mentions)
Milli q water, by Merck Group (1 mentions)
1 octadecene, by Merck Group (1 mentions)
Tetraethyl orthosilicate, by Merck Group (1 mentions)
Sodium citrate dihydrate, by Merck Group (1 mentions)
Sodium oleate, by ABCR (1 mentions)
Hexadecylamine, by Merck Group (1 mentions)
Benzyl ether, by Merck Group (1 mentions)
Iron pentacarbonyl, by Merck Group (1 mentions)
N hexane, by Scharlab (1 mentions)
Absolute ethanol, by Scharlab (1 mentions)
Ethyl acetate, by Merck Group (1 mentions)
6 protocols using tetramethylammonium hydroxide tmah solution
1
Synthesis of Iron Oxide Nanoparticles via Microemulsion
2
Synthesis of Silica-Coated Iron Oxide Nanoparticles
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Iron(II)chloride hexahydrate (FeCl 2 .4H 2 O, ≥ 99%), 1-octadecene (ODE, technical grade 90%), oleic acid (OA, technical grade 90%), sodium citrate dihydrate (Na-citrate, ≥ 99%), tetramethylAmmonium hydroxide solution (TMAH, ACS reagent) and tetraethyl orthosilicate (TEOS, reagent grade 98%) were purchased from Sigma-Aldrich® (Schnelldorf, Germany). Cetyltrimethylammonium bromide (CTAB, ≥ 99%) and iron(III)chloride hexahydrate (FeCl 3 .6H 2 O, ≥ 99%) were bought from Acros Organics® (Geel, Belgium).
Trimethoxysilylpropyl-N,N,N-trimethylammonium chloride (TMAPS, in 50% methanol) and sodium oleate (> 97%) were purchased from abcr® (Karlsruhe, Germany) and Tokyo Chemical Industry (TCI, Japan), respectively. Ammonium hydroxide solution (25 wt%) was bought from Merck Life Sciences AS. The 3 dsDNA namely, T21, GM5 and GM6 were supplied by Biolegio B.V. (Nijmegen, Netherlands) and further details regarding the dsDNA can be found in the SI (Materials and Methods). All the chemicals were used as received without any further puri cation or modi cation. All solutions were prepared using distilled deionized water (MilliQ water), having a resistivity ~ 18.2 MΩ/cm at 25 ℃, taken from Simplicity® Millipore (Darmstadt, Germany) water puri cation system.
Trimethoxysilylpropyl-N,N,N-trimethylammonium chloride (TMAPS, in 50% methanol) and sodium oleate (> 97%) were purchased from abcr® (Karlsruhe, Germany) and Tokyo Chemical Industry (TCI, Japan), respectively. Ammonium hydroxide solution (25 wt%) was bought from Merck Life Sciences AS. The 3 dsDNA namely, T21, GM5 and GM6 were supplied by Biolegio B.V. (Nijmegen, Netherlands) and further details regarding the dsDNA can be found in the SI (Materials and Methods). All the chemicals were used as received without any further puri cation or modi cation. All solutions were prepared using distilled deionized water (MilliQ water), having a resistivity ~ 18.2 MΩ/cm at 25 ℃, taken from Simplicity® Millipore (Darmstadt, Germany) water puri cation system.
3
Iodine Extraction from Breast Milk
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Ten mL of breast milk was collected from each mother in plastic cups and stored in tightly capped vials. Breast milk samples were collected between 9:00 and 11:00 AM. Samples were frozen until they are analyzed. To extract iodine from the breast milk 1.5 mL of 25% tetramethylammonium hydroxide (TMAH) solution (Sigma‐Aldrich, St. Louis, MO) and 0.5 mL of 30% hydrogen peroxide were added to the breast milk samples (3 mL) and mixed well. These samples were incubated in an oven at 90°C for 3 hr using DigiTUBES (Perkin‐Elmer, Waltham, MA). After cooling to room temperature, the samples were centrifuged at 1,532 x g for 15 minutes. For analysis, all breast milk samples were diluted 25‐fold with 5% TMAH (Sigma‐Aldrich, St. Lowis, MO) in deionized water. BMIC was analyzed by ICP‐MS (Fecher, Goldmann, & Nagengast, 1998 ). Tellurium (Perkin‐Elmer Life and Analytical Sciences, Shelton, CT) was utilized as an internal standard. Non‐fat milk powder (RM 1549, National Institute of Standards and Technology, Gaithersburg, MD) was used as an external control. The reference value for the external control was 3.38 ± 0.02 mg I/kg and the measured value was 3.35 ± 0.03 mg/kg.
4
Synthesis of Monodisperse Iron Oxide Nanoparticles
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All reactants used were commercially available: hexadecylamine (HDA) 98% purity, oleic acid (OA) 99% purity, iron pentacarbonyl, dibenzyl ether 98% purity, ethyl acetate (99.5% purity), tetramethylammonium hydroxide (TMAH) solution in water (25% wt), and benzyl ether (98% purity) were purchased from Sigma-Aldrich Saint Louis, MO, USA and were used as received. Absolute ethanol and n-hexane 99% reagent grade were supplied by Scharlau, Cham Germany.
5
Cefdinir Suspension Assay Development
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Cefdinir (CR) suspension produced by Pharmacare PLC (Ramallah, Palestine) and USP CR reference standard (RIs; Holland Moran, Holon, Israel) was used in this study. High-performance liquid chromatography (HPLC)-grade solvents such as acetonitrile and methanol were purchased from Sigma-Aldrich GmbH (Germany) and were used as received. Potassium dihydrogen phosphate, dibasic sodium phosphate, sodium hydroxide pellets, phosphoric acid, tetramethylammonium hydroxide (TMAH) solution, citric acid, and tetrahydrofuran were also purchased from Sigma-Aldrich (Germany). Purified water was obtained using a Millipore Milli-Q plus water purification system.
6
Trace Analysis of Iodide and Bromide
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Ultrapure water (resistivity >18.2 MΩ.cm at 25 °C) produced in an Aarium® pro water purification system (Sartorius, Gottingen, Germany) was used. Tetramethylammonium hydroxide (TMAH) solution (25% w/w in H2O) and Triton X-100 (laboratory grade) were obtained from Sigma-Aldrich (Buchs, Switzerland).
All laboratory ware (bottles, tubes, volumetric flasks) was made of polypropylene and was decontaminated by immersion in a 2% (v/v) TMAH solution for at least 24 h, followed by thorough rinsing with ultrapure water and drying at room temperature under dust-free conditions.
Iodide Standard for ICP (TraceCERT®, 1000 mg/L I− in water, from Sigma-Aldrich) and Bromide ICP Standard (AccuSPEC, 1000 mg/L Br− in water, from SCP Science, Baie-D’Urfe, Quebec, Canada) were used to prepare the calibration standards. Tellurium Standard for ICP (TraceCERT®, 1000 mg/L Te, Sigma-Aldrich) was used to prepare the internal standard (IS) solution.
Calibration standard solutions (n = 5) were prepared in the range of 200–20,000 µg/L for bromine and 20–200 µg/L for iodine by properly diluting commercial stock solutions with ultrapure water.
All laboratory ware (bottles, tubes, volumetric flasks) was made of polypropylene and was decontaminated by immersion in a 2% (v/v) TMAH solution for at least 24 h, followed by thorough rinsing with ultrapure water and drying at room temperature under dust-free conditions.
Iodide Standard for ICP (TraceCERT®, 1000 mg/L I− in water, from Sigma-Aldrich) and Bromide ICP Standard (AccuSPEC, 1000 mg/L Br− in water, from SCP Science, Baie-D’Urfe, Quebec, Canada) were used to prepare the calibration standards. Tellurium Standard for ICP (TraceCERT®, 1000 mg/L Te, Sigma-Aldrich) was used to prepare the internal standard (IS) solution.
Calibration standard solutions (n = 5) were prepared in the range of 200–20,000 µg/L for bromine and 20–200 µg/L for iodine by properly diluting commercial stock solutions with ultrapure water.
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