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6 protocols using calcium chloride dihydrate

1

Preparation and Characterization of Ion Exchange Membranes

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Sodium hypochlorite (NaClO, 14%), sodium hydrogen phosphate (NaH2PO4), sodium chloride (NaCl), calcium chloride dihydrate (CaCl2∙2H2O), magnesium sulfate heptahydrate (MgSO4∙7H2O), sodium hydrogen carbonate (NaHCO3), potassium nitrate (KNO3), sodium nitrate (NaNO3), calcium carbonate (CaCO3), magnesium chloride hexahydrate (MgCl2∙6H2O), potassium sulfate (K2SO4), sodium sulfate (Na2SO4), calcium sulfate dihydrate (CaSO4∙2H2O), boric acid (H3BO3, 0.5%), hydrogen peroxide (H2O2, 30%), and chloride acid (HCl, 0.1 M) were purchased from Scharlab S.L., Barcelona, Spain. The ultrapure water (Milli-Q) used in the experiments was obtained from Millipore, Molsheim, France, equipment (conductivity less than 0.055 µS cm−1).
Polyvinyl chloride (PVC, Mw 112,000 g mol−1) was supplied by ATOCHEM, Madrid, Spain. Tetrahydrofuran (THF) was purchased from Scharlab S.L. Amberlite® IRA-402 (Cl form, total exchange capacity ≥ 1.0 mol L−1) was supplied by Merck Life Science, Darmstadt, Germany, S.L.U.
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2

Synthesis of Polymer Composites

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PB (98%), low-viscosity SA (99%), and DCA (98%) were purchased from Sigma-Aldrich Co., (St Louis, MO, USA). Calcium chloride dihydrate (CaCl2·2H2O, 98%) was obtained from Scharlab S.L (Sentmenat, Spain). All solvents and reagents were supplied by Merck KGaA (Darmstadt, Germany) and were of high-performance liquid chromatography grade and used without further purification.
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3

Metformin-Alginate Nanoparticle Formulation

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Metformin (M, 98%), sodium alginate (SA, 99%), chenodeoxycholic acid (CDCA, 99%) and Poloxamer 407 were purchased from Sigma Chemical Co (St. Louis, MO, USA). Eudragit® RS30D, RL30D and NM30D polymers were supplied by Evonik Industries (Essen, Germany). Calcium chloride dihydrate (CaCl2 2H2O 98%) was obtained from Scharlab S.L (Barcelona, Spain). All reagents and solvents were HPLC grade, used without further purification or modification and were supplied by Merck (Bayswater, VIC, Australia).
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4

Reagent Procurement for Chemical Analysis

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G (99.92%), LVSA (99%), and DCA (99%) were purchased from Sigma-Aldrich Co (St Louis, MO, USA). Calcium chloride dihydrate ([CaCl2 · 2H2O] 98%) was obtained from Scharlab SL (Barcelona, Spain). All solvents and reagents were supplied by Merck (Darmstadt, Germany), and were of high-performance liquid chromatography (HPLC) grade and used without further purification.
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5

Composite Alginate-Based Metformin Formulation

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Metformin (M, 98%), sodium alginate (SA, 99%) and chenodeoxycholic acid (CDCA, 99%) purchased from Sigma Chemical Co, USA. Calcium chloride dihydrate (CaCl2.2H2O 98%) was obtained from Scharlab S.L, Australia. All reagents and solvents were HPLC grade used without further purification or modification and were supplied by Merck (Australia).
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6

Probucol-Alginate-Cholic Acid Formulation

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Probucol (PB, 98%, C 31 H 48 O 2 S 2 ), low viscosity sodium alginate (99%) and cholic acid (CA, 98%, C 24 H 40 O 5 ) were purchased from Sigma Chemical Co, USA. Calcium chloride dihydrate (CaCl 2 .2H 2 O, 98%) was obtained from Scharlab S.L, Australia. All solvents and reagents were supplied by Merck (Australia), and were of HPLC grade and used without further manipulation. Dulbecco's Modified Eagle's medium (DMEM) was obtained from Sigma Chemical Co, USA. Mouse ultrasensitive insulin ELISA was purchased from Mercodia (Uppsala, Sweden).
Stock suspensions of PB (10 mg/ml) and CA (1 mg/ml) were prepared by adding the powder to 10% Ultra watersoluble gel. The CaCl 2 stock solution (2%) was prepared by adding CaCl 2 powder to HPLC water. All preparations were mixed thoroughly at room temperature for 6 h, stored in the refrigerator, and used within 48 h of preparation.
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