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6 protocols using sulfamethoxypyridazine

1

Multiresidue Analysis of Sulfonamides

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MeCN, methanol, n‐hexane, and formic acid were supplied by Merck. Ultrapure water was prepared with a Milli‐Q system by Millipore. All solvents were in chromatographic grade.
Analytical standards (≥98%) of sulfadiazine (SD), sulfadimethoxine (SDM), sulfamerazine (SM), sulfamethazine (SM2), sulfamethizole (SMT), sulfamethoxazole (SMZ), sulfathiazole (STZ) sulfachlorpyridazine (SCD), trimethoprim (TMP), sulfamethoxypyridazine (SMD), sulfapyridine (SPD), sulfadoxine (SDX), sulfisoxazole (SIZ), sulfabenzamide (SBA), sulfaquinoxaline (SQX), sulfacetamide (SAA), and sulfaphenazole (SPZ) were purchased from Sigma‐Aldrich. Stock solutions were prepared at a concentration of 100 µg/ml in methanol, and mixed standard solutions were diluted to 1,000 ng/ml. All solutions were stored at −20°C.
Oasis PRiME HLB (6cc, 200 mg) was purchased from Waters. EMR‐L product was purchased from Agilent Technologies, which consisted of two 15‐ml centrifuge tubes. QuEChERS d‐SPE EMR‐L contained 1 g EMR‐L material, and QuEChERS Final Polish EMR‐L contained 1.6 g magnesium sulfate and 0.4 g sodium chloride for salting out.
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2

Determination of Sulfonamides via Coordination Polymer

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All reagents used in this experiment were at least analytical grade. All the ultrapure water used in the experiment was obtained through Milli-Q (Millipore, Bradford, MA, USA). Ten sulfonamides: sulfamethoxazole (SMZ), sulfafurazole (SIZ), sulfamethizole (SMT), sulfadiazine (SD), sulfadimidine (SM2), sulfametoxydiazine (SMD), sulfadoxine (SDM′), sulfapyridine (SPD), sulfathiazole (ST), sulfamethoxypyridazine (SMP) were purchased from Sigma. 1,3,5-Triformylphloroglucinol (Tp), glycol, diglycolic anhydride (DA), 1,6-hexanediamine, benzidine (BD), and FeCl3·6H2O were purchased from Aladdin (Shanghai, China). Ethanol, N,N-dimethylformamide (DMF), tetrahydrofuran (THF), mesitylene, and 1,4-dioxane were purchased from Concord Chemical Research Institute (Tianjin, China). HNO3 were obtained from Guangfu Fine Chemical Research Institute (Tianjin, China). All glassware should be soaked in aqua regia (HCl : HNO3 = 3 : 1, v/v) for at least 24 h and cleaned with ultrapure water.
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3

Comprehensive Analysis of Pharmaceutical Compounds

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Amoxicillin, azithromycin, cefuroxime, chloramphenicol, chlortetracycline, ciprofloxacin, clarithromycin, colistin, danafloxacin, decoquinate, dexamethasone, diclofenac, difloxacin, doxycycline, enrofloxacin, erythromycin, florfenicol, flumethasone, griseofulvin, ibuprofen, levofloxacin, lincomycin, maduramicin, mefenamic acid, monesin, narasin, nicarbazin, norfloxacin, oxytetracycline, paracetamol, propranolol, robenidine, sarafloxacin, salinomycin, spectinomycin, sulfachloropyridine, sulfadiazine, sulfadimethoxine, sulfamerazine, sulfamethasone, sulfamethoxazole, sulfamethoxypyridazine, sulfapyridine, sulfaquinoxaline, sulfathiazole, tetracycline, trimethoprim, and tylosin with a purity above 98% were bought from Sigma-Aldrich (St. Louis, MO, USA). Anhydrous citric acid, trichloroacetic acid (TCA), ethylenediaminetetraacetic acid disodium salt (EDTA), and disodium hydrogen phosphate dehydrate were also purchased from Sigma-Aldrich (St. Louis, MO, USA). Acetonitrile (ACN), methanol (MeOH) (HPLC grade ≥ 99%), and formic acid (purity > 99% for analysis) were obtained from Acros Organics (Geel, Belgium). Purified water, with a resistivity higher than 18.0 MU, was prepared in the laboratory with a Milli-Q system from Millipore (Burlington, MA, USA).
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4

Quantitative Analysis of Sulfonamides and Trimethoprim

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The sulfonamide analytical standards (sulfathiazole (STZ), sulfamethoxazole (SMX), sulfamerazine (SMR), sulfamethoxypyridazine (SMPD), sulfadimethoxine (SDMX), sulfapyridine (SP), sulfamethazine (SMZ)), and trimethoprim (TMP) were purchased from Sigma-Aldrich Company Ltd. (St. Louis, MO, USA). All analytical standards had a purity greater than 99.0%. Primary secondary amine (PSA) was obtained from United Chemical Technologies, Inc. (UCT Inc., Bristol, PA, USA), and formic acid (98%) was purchased from Sigma-Aldrich Company Ltd. (St. Louis, MO, USA). Anhydrous magnesium sulfate was supplied by J.T. Baker (Center Valley, PA, USA) and sodium acetate trihydrate from Spectrum Chemical Mfg., Corp. (New Brunswick, NJ, USA). Methanol (MeOH) and acetonitrile (ACN) were obtained from Honeywell Burdick & Jackson (Muskegon, MI, USA) and J.T. Baker (Center Valley, PA, US), respectively. All solvents were of HPLC grade, and all reagents were of analytical grade. Ultra-pure deionized water was obtained from a Milli-Q Plus water purification system (Millipore, Bedford, MA, USA). Filtration of the aqueous mobile phase was performed using polyvinylidene fluoride (PVDF) membranes, and polytetrafluoroethylene (PTFE) membranes were used for organic mobile-phase filtration, both with 0.22 µm pore size obtained from Millipore (Bedford, MA, USA).
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5

Quantification of Veterinary Drugs and Antibiotics

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Amoxicillin, azithromycin, cefuroxime, chloramphenicol, ciprofloxacin, clarithromycin, colistin, danafloxacin, decoquinate, dexamethasone, diclofenac, difloxacin, doxycycline, enrofloxacin, erythromycin, florfenicol, flumethasone, griseofulvin, ibuprofen, levofloxacin, lincomycin, maduramicin, mefenamic acid, monesin, narasin, nicarbazin, norfloxacin, oxytetracycline, paracetamol, propranolol, robenidine, sarafloxacin, salinomycin, spectinomycin, sulfachloropyridine, sulfadiazine, sulfadimethoxine, sulfamerazine, sulfamethasone, sulfamethoxazole, sulfamethoxypyridazine, sulfapyridine, sulfaquinoxaline, sulfathiazole, tamoxifen, tetracycline, trimethoprim and tylosin with purity between 98 and 101% were bought from Sigma-Aldrich (St. Louis, MO, USA). Acetonitrile (ACN) and methanol (MeOH) (HPLC grade ≥ 99%) were obtained from Acros Organics (Geel, Bergium) and purified water was prepared in the laboratory with a Milli-Q system from Millipore (Burlington, MA, USA).
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6

Daphne genkwa Flower Phytochemicals

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Reference standards, genkwanin 5-O-β-D-primeveroside, genkwanin 5-O-β-D-glucoside, genkwanin, potassium apigenin 7-O-β-D-glucuronate, apigenin, and tiliroside were isolated from the flowers of Daphne genkwa. Sulfamethoxypyridazine was purchased from Sigma (St. Louis, MO, U.S.A.). Acetic acid was purchased from Nacalai (Tokyo, Japan). Acetonitrile, methanol and acetone (HPLC grade) were purchased from BDH (Poole, England). Ultrapure distilled water with a resistance greater than 18 MΩ was used.
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