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Ciprofloxacin hydrochloride

Manufactured by Merck Group
Sourced in United States, Germany

Ciprofloxacin hydrochloride is a synthetic antibacterial agent belonging to the fluoroquinolone class. It is a crystalline powder used as a raw material in the production of various pharmaceutical products.

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33 protocols using ciprofloxacin hydrochloride

1

Preparation of Ciprofloxacin Stock Solution

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1000 μg/ml ciprofloxacin hydrochloride USP standard stock solution was prepared by dissolving 10 mg ciprofloxacin hydrochloride (Sigma–Aldrich, St. Louis, Missouri, USA) in 10 ml of tris-buffered saline solution (TBS) which consisted of TrisHCl 100 mM (Sigma–Aldrich) and NaCl 150 mM (Sigma–Aldrich) adjusted pH to 7.6 by using NaOH and HCl.
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2

Silk Nanomaterial Compression and Bioactive Incorporation

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Amorphous silk nanomaterials (ASN) was packed into predesigned mold, followed by hot pressing at 632 MPa and variable temperatures (25 °C, 65 °C, 95 °C, 125 °C, 145 °C, 175 °C) for 15 min. After hot pressing, the samples were cooled down to room temperature and used for characterizations. To incorporate bioactive molecules in the system, the silk powder was doped with ciprofloxacin hydrochloride (5 wt%, Sigma-Aldrich), gentamicin sulfate (5 wt%, Sigma-Aldrich), horseradish peroxidase (HRP) (1 wt%, Sigma-Aldrich), and protease XIV (1 wt%, Sigma-Aldrich) by thorough mixing and subject to hot processing.
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3

Evaluating Antioxidant and Antibacterial Potential

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Ciprofloxacin hydrochloride, Folin–Ciocalteu’s phenol reagent, gallic acid, sodium carbonate, formic acid (HPLC), acetonitrile (HPLC), 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical, 2,2′-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS), (R)-(+)-6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid (Trolox), silver nitrate (AgNO3), and dimethyl sulfoxide (DMSO) were purchased from Sigma-Aldrich (Steinheim, Germany). 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) was obtained from Merck (Darmstadt, Germany). Dulbecco’s Modified Eagle’s Medium/Dulbecco’s Minimum Essential Media (DMEM) and penicillin-streptomycin solution were purchased from Biological Industries Israel Beit Haemek Ltd. (Beit Haemek, Israel). Mueller-Hinton broth was supplied by Oxoid (Basingstoke, UK). Fetal bovine serum and trypsin/ethylenediaminetetraacetic acid (EDTA) solution were provided by Biochrom (Berlin, Germany). All other chemicals and reagents were of analytical grade. Ultra-pure water was obtained from SG Water Ultra Clear TWF water purification system (Barsbüttel, Germany).
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4

Antimicrobial Susceptibility Testing Protocol

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Cefazolin was obtained from Acros Organics. Ciprofloxacin hydrochloride, linezolid and vancomycin hydrochloride were obtained from Sigma-Aldrich (St. Louis, MO, USA). Tetracycline hydrochloride was obtained from Alfa Aesar. Sorangicin A was provided by HZI, Braunschweig. Stock solutions were prepared in Milli-Q water or dimethyl sulfoxide (DMSO, Sigma-Aldrich). Minimum inhibitory concentrations (MICs) were determined in cation-adjusted Mueller-Hinton broth (MHB2) using the broth microdilution method as recommended by the Clinical and Laboratory Standards Institute (CLSI). The MIC was defined as the lowest concentration of the antibiotic causing complete inhibition of visible growth of the microorganism (CLSI, 2017) [58 ].
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5

Antimicrobial and Antifungal Susceptibility Assay

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Antimicrobial stock solutions of vancomycin hydrochloride (Sigma, MO), clindamycin hydrochloride (RPI Corp., IL), ciprofloxacin hydrochloride (Sigma-Aldrich, WY), tobramycin sulfate (Sigma, MO), methicillin sodium salt (Sigma, MO), and linezolid (AK Scientific, CA) were diluted in phosphate-buffered saline to a maximum concentration of 100 μg/ml. The stock solutions of the antifungal drugs amphotericin B and fluconazole were diluted in PBS to maximum concentrations of 16 μg/ml and 2 mg/ml, respectively. Any subsequent dilutions needed for the antimicrobial susceptibility assays were made in PBS. To study the effect of drugs in preventing biofilm formation, 50 nl of drugs was printed at 2-fold dilutions on top of the hydrogel spots after initial printing of the cells. The microarray(s) containing drugs was then incubated in a humidified hybridization cassette for a maximum of 24 h, gently washed in PBS, stained with FUN-1, and analyzed using the microarray scanner.
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6

Silk Nanomaterial Compression and Bioactive Incorporation

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Amorphous silk nanomaterials (ASN) was packed into predesigned mold, followed by hot pressing at 632 MPa and variable temperatures (25 °C, 65 °C, 95 °C, 125 °C, 145 °C, 175 °C) for 15 min. After hot pressing, the samples were cooled down to room temperature and used for characterizations. To incorporate bioactive molecules in the system, the silk powder was doped with ciprofloxacin hydrochloride (5 wt%, Sigma-Aldrich), gentamicin sulfate (5 wt%, Sigma-Aldrich), horseradish peroxidase (HRP) (1 wt%, Sigma-Aldrich), and protease XIV (1 wt%, Sigma-Aldrich) by thorough mixing and subject to hot processing.
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7

Phage PEV20 Isolation and Characterization

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Phage PEV20 was provided by AmpliPhi Biosciences AU at a titre of 1010 plaque forming unit (PFU)/mL in phosphate buffered saline (PBS, 0.01 M phosphate buffer, 0.0027 M KCl and 0.137 M NaCl) [28 ]. This phage was formerly isolated from the sewage treatment plant in Olympia (WA, USA) by Kutter lab (Evergreen phage lab). Ciprofloxacin hydrochloride was purchased from Sigma-Aldrich Inc.
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8

Antibiotic and Phytochemical Evaluation

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Oxacillin sodium monohydrate, erythromycin (base), gentamicin sulfate, ciprofloxacin hydrochloride, tetracycline hydrochloride and clindamycin phosphate were purchased from Sigma-Aldrich (Steinheim, Germany). Morusin and kuwanon G (purity min. 97%) were obtained from Carbosynth Limited (Berkshire, UK).
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9

Ciprofloxacin Kidney Exposure Protocol

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ciprofloxacin hydrochloride (Sigma-Aldrich), which is water soluble, was diluted in the SMCM at final concentrations of 100 and 200 μg/mL; these concentrations reflect the approximate ciprofloxacin concentrations to which the kidney is exposed and are in accordance with other study protocols of ciprofloxacin treatment for HASMCs (12 (link), 21 (link), 37 (link), 47 (link)). In all experiments, the prepared 100 and 200 μg/mL ciprofloxacin solutions were treated for 24 hours, along with the start of the rhythmic strain.
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10

Antibiotic Minimum Inhibitory Concentration

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Ciprofloxacin hydrochloride, amikacin, aztreonam, colistin sulphate and tobramycin sulphate were purchased from Sigma-Aldrich Inc. The Minimum inhibitory concentration (MIC) of antibiotics was determined as per [25 (link)] with minor modifications. Briefly, 100 µL of antibiotics (512, 256, 128, 64, 32, 16, 8, 4, 2, 1, 0.5, 0.25, 0.125 mg/L) were added to 100 µL of early-log phase bacterial culture (106 CFU/mL). The treated culture was incubated overnight at 37 °C with continuous shaking at 150 rpm. MIC was determined to be the concentration of antibiotic at which the optical density (OD600) was equal to that of a cell-free blank control.
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