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5 protocols using hplc grade ammonium acetate

1

Metabolite Extraction and Quantification

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HPLC grade ammonium acetate, acetonitrile, methanol, chloroform, ethanol, hexane, and water were procured from Burdick & Jackson (Morristown, NJ). MS grade formic acid, standard compounds and isotope labeled standards, including N-acetyl aspartic acid-d3, tryptophan-15N2, sarcosine-d3, glutamic acid-d5, thymine-d4, gibberellic acid, trans-zeatin, jasmonic acid, 15N anthranilic acid, and testosterone-d3, were purchased from Sigma-Aldrich (St. Louis, MO).
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2

Comprehensive Metabolite Profiling Approach

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High-performance liquid chromatography (HPLC)-grade ammonium acetate, acetonitrile, methanol, chloroform and water were procured from Burdick & Jackson (Morristown, NJ). MS grade formic acid, standards and internal standards, N-acetyl aspartic acid-d3, tryptophan-15N2, sarcosine-d3, glutamic acid-d5, thymine-d4, gibberellic acid, trans-zeatin, jasmonic acid, anthranilic acid-15N, and testosterone-d3, were purchased from Sigma-Aldrich (St. Louis, MO). Mixture of LPC 17:0/0:0, PG 17:0/17:0, PE 17:0/17:0, PC 17:0/17:0, TAG 17:0/17:0/17:0, SM 18:1/17:0, MAG 17:0, DAG 16:0/18:1, CE 17:0, ceramide 18:1/17:0, PA 17:0, PI 17:0/20:4, and PS 17:0/17:0. were obtained from Avanti polar lipids (USA) (Supplementary Table S1).
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3

HPLC Buffer Preparation and Solvents

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Buffer solutions (polar solvents for HPLC experiments) were prepared by dissolving HPLC-grade ammonium acetate (VWR International, Leuven, Belgium) in ultrapure water obtained from a Milli-Q water purification system (Merck Millipore, Darmstadt, Germany). To adjust the buffer solutions’ pH, two concentrated solutions were used: ammonia (Avantor Performance Materials Poland S.A., Gliwice, Poland) and acetic acid (Chempur, Piekary Śląskie, Poland). HPLC-grade acetonitrile (Chempur, Piekary Śląskie, Poland) and isopropanol (VWR International, Leuven, Belgium) were used as non-polar solvents for HPLC experiments.
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4

Minocycline-Albumin Nanoparticle Synthesis

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Minocycline, Bovine Serum Albumin (lyophilized powder, ≥96% agarose gel electrophoresis), anhydrous ethanol (200 proof, anhydrous, ≥99.5%) crosslinker NHS-PEG-MAL-5000 and transferrin (human: minimum 98%) were purchased from Sigma Aldrich Saint Louis, MO, USA. HPLC Grade Ammonium acetate was purchased from VWR. HPLC-grade water, Methanol and Acetonitrile were purchased from Fisher Scientific. HPLC-grade glutaraldehyde (100%) was obtained from Alfa Aesar (Ward Hill, MA, USA). The Millipore Milli-Q Plus apparatus was used to procure ultrapure water. All other chemicals used in this study were of analytical grade. Traut’s reagent (2-Iminothiolane) and Ellman’s reagent were obtained from Pierce (Rockford, IL, USA). The PD-10 Columns SephadexTM G-25 M were from GE Healthcare. Lyophilizer, Centrifuge (Effendorf centrifuge 5810R, Thermo scientific sorvall RC 6+, Waltham, MA, USA), Zeta sizer (malvern), HPLC (Thermo Fischer), Sonicator and Rota evaporator (Rotaevapor Buchi, R-210) instruments were used in the study.
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5

Minocycline-Based Drug Delivery Platform

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Minocycline, Bovine Serum Albumin (lyophilized powder, ≥96% agarose gel electrophoresis), anhydrous ethanol (200 proof, anhydrous, ≥99.5%) crosslinker NHS-PEG-MAL-5000 and transferrin (human: minimum 98%) were purchased from Sigma Aldrich U.S.A. HPLC Grade Ammonium acetate was purchased from VWR. HPLC grade water, Methanol and Acetonitrile were purchased from Fisher Scientific. HPLC-grade glutaraldehyde (100%) were obtained from Alfa Aesar (USA). The Millipore Milli-Q Plus apparatus was used to procure ultrapure water. Traut's reagent (2-Iminothiolane) and Ellman's reagent was obtained from Pierce (Rockford, USA). The PD-10 Columns SephadexTM G-25 M were from GE Healthcare. Lyophilizer, Centrifuge (Eppendorf Centrifuge 5810R, Thermo scientific sorvall RC 6+), Zeta sizer (malvern), HPLC (Thermo Fischer), Sonicator and Rota evaporator (Rotaevapor Buchi, R-210) instruments were used in the study.
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