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2 protocols using hplc grade methanol

1

Tacrolimus Extraction and PLGA Formulation

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Tacrolimus was extracted from expired Prograf 5 mg capsules (Batch # 7241), as previously described55 (link). Ploy (D, L-lactide-co-glycolide; lactide: glycolide (50:50) (PLGA)) with Mw 30,000–60,000 and Poloxamer-188 were purchased from Sigma Aldrich Co. (St. Louis MO, USA). Chloroform and dichloromethane (DCM) were purchased from MERK (Darmstadt, F.R. Germany) and PANREAC QUIMICA SA, (Barcelona, Spain), respectively. Polyvinyl alcohol (PVA, Mw 17,200) and acetone were purchased from AVON- CHEM Ltd. (Wellington House, Waterloo St. West, Macclesfield, Cheshire, UK). The HPLC grade methanol was obtained from BDH Ltd. (Poole, England). Phosphate buffer saline was obtained from GIBCO, Life Technologies Ltd. (Paisley, Scotland). Acetonitrile (HiPerSolv Chromanorm, HPLC-grade) were purchased from BDH, PROLABO1, LEUVEN, EC. Milli-Q water purifier (Millipore, France) was used for purified water and all other used chemicals were analytical grade and solvents were HPLC grade. Diagnostic kits for creatinine, blood urea, uric acid and potassium (Giesse Diagnostics, Rome, Italy).
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2

Neurochemical Analysis of Caffeine and Nicotine

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Caffeine was obtained from Global Chemie (Mumbai, India). It was dissolved in saline. Nicotine is nicotine hydrogen tartrate salt and was obtained from BDH Chemicals Ltd (England) and dissolved in saline. Thiobarbituric acid, trichloroacetic acid, perchloric acid, triethylamine, absolute ethyl alcohol, sulfanilamide, and N-1-naphthyl ethylene diamine were supplied by Sigma Aldrich. In addition, glutathione, acetylthiocho-line iodide, ethylene diamine tetraacetic acid, 5,50-dithiobis-(2-nitrobenzoic acid) (DTNB), and phosphate buffers were obtained from Sigma Aldrich. Analytical-grade glacial acetic acid, dansyl chloride, lithium carbonate, and high-performance liquid chromatography (HPLC)-grade acetonitrile were purchased from Fisher (UK). Standard amino acids and HPLC-grade methanol were supplied by BDH (England).
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