Exact(5)
The highly syndiotactic PVA was derived from poly (vinyl acetate) prepared through the radical polymerization of vinyl acetate in (CF3 2CHOH.
After staining with 2% uranyl acetate prepared in 50% ethanol and incubation with a lead citrate solution, sections were observed on a Hitachi H-600 transmission electron microscope.
Mobile phase A was 5 mM ammonium acetate prepared with HPLC grade water.
Mobile B was 5 mM ammonium acetate prepared in 98% HPLC grade acetonitrile with 2% of HPLC grade water.
Franssen-van Hal et al. applied a Vydac RP 18 column in combination with gradient elution with two eluents composed of ACN/ tert-butylmethylether/ammonium acetate prepared in different ratios to separate β-carotene, retinoic acid, retinal, retinyl palmitate, β-apo-4´-, β-apo-8´-, β-apo-10´-, and β-apo-12´-carotenal within 30 min [ 91].
Similar(54)
They were then analyzed by capillary GC/MS as methyl ester acetates (prepared using acetic anhydride in acetic acid with perchloric acid catalyst) or as methyl ester trimethylsilyl derivatives (prepared using Tri-Sil, Pierce Chemicals, Rockford, IL).
Solutions of 0.5 M zinc acetate, 0.5 M sodium sulphide, and 1 M manganese acetate were prepared in separate beakers.
For the aluminum doping, the aluminum acetate solution prepared in ethanol was mixed with 0.1 M zinc acetate with different molar concentrations.
An easily accessible acetamidine salt is acetamidinium acetate (3), prepared by the reaction of triethyl orthoacetate, ammonia and ammonium acetate [16].
Additional standards of DCP in ethyl acetate were prepared in the range of 2 400 μM and were diluted with 0.25 μM DCP- d5 in ethyl acetate to be in the range of 0.1 0.6 μM.
The As.EtAc was solubilized by the following method; a solution of Tween-80 (100 mg/ml in ethyl acetate) was prepared, and 0.1 ml of this solution was added to the solution of As.EtAc (300 mg/ml) in ethyl acetate and shaken.
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