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3 protocols using dipyridamole

1

Prostanoid and Nucleotide Quantification

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All prostanoids (PGE3, PGF, TXB3, PGE2, PGF, and TXB2), deuterated prostanoids (PGE2-d4, PGF-d4, and TXB2-d4), and EPA were purchased from Cayman Chemical Co. (Ann Arbor, MI). Calcium ionophore A23187 and indomethacin were purchased from Sigma Aldrich (St. Louis, MO). Adenosine 5′-triphosphate (ATP) disodium salt hydrate, 5′-adenylic acid (AMP), and sodium creatine phosphate hydrate were purchased from Tokyo Chemical Industry Co., Ltd. (Tokyo, Japan). Creatine kinase was purchased from Roche Applied Science (Tokyo, Japan). Dipyridamole, probenecid, quercetin, methotrexate, and folic acid were purchased from Wako Pure Chemical Industries (Osaka, Japan). MK571, celecoxib, candesartan, estradiol 17β-glucronide (E217βG), adenosine 3′, 5′-cyclic monophosphate (cAMP), and guanosine 3′, 5′-cyclic monophosphate (cGMP) were purchased from Sigma Aldrich (St. Louis, MO). All other chemicals were of the highest purity available.
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2

Solubility Measurement of Pharmaceutical Compounds

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Albendazole was purchased from Tokyo Chemical Industry Co., Ltd (Tokyo, Japan). Griseofulvin, dipyridamole, and glibenclamide were purchased from FUJIFILM Wako Pure Chemical Corporation (Osaka, Japan). An identical batch was used by all companies.
The Japanese Pharmacopeia (JP) 2nd fluid for dissolution testing (12.5 mM KH2PO4 and 12.5 mM Na2HPO4, pH 6.8, buffer capacity 10 mM/ ΔpH) was used for the solubility measurement.
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3

Screening of BCS Class II APIs

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Materials Three highly water-insoluble BCS class II classified compounds, namely, nifedipine, which is a weak base (Daito pharmaceutical, Japan), Fenofibrate, a neutral compound (Moehs coprima, Spain), Indomethacin, which is an acid-base compound (Sogo pharmaceutical, Japan) were used as model API for screening studies. The physicochemical properties and morphology of the model APIs are indicated in Table 1 and Fig. 1, respectively. Other APIs were also used as model compound classified in BCS class II. Cilostazol was purchased from Daito Pharmaceutical (Japan). Phenytoin, bezafibrate, itraconazole, piroxicam, dipyridamole, and ketoprofen were purchased from Wako (Japan). The dispersing agents and wetting agents used in this study are listed in Tables 2,3, respectively. These tables were summarized from each vendor's technical catalogs. Dispersing agents and wetting agents were selected from common polymer and surfactant in the pharmaceutical industry. Other reagents for quality testing were purchased from Wako (Japan).
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