Characterization of poly(ethylene glycol)-b- poly(ε-caprolactone) by two-dimensional liquid chromatography
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چکیده
منابع مشابه
Measurement of polyethylene glycol 400 in urine by direct-injection high-performance liquid chromatography.
We describe a new "high-performance" liquid chromatographic (HPLC) method for estimating polyethylene glycol 400 (PEG 400) in urine. Direct injection of diluted urine samples onto the column eliminates the necessity for lengthy preparative steps, resulting in considerable saving of both time and chemicals. High analytical recoveries (94-102%) and a rapid rate of analysis are achieved. Results v...
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A bioactive composite of nano calcium-deficient apatite (n-CDAP) with an atom molar ratio of calcium to phosphate (Ca/P) of 1.50 and poly(ɛ-caprolactone)-poly(ethylene glycol)-poly(ɛ-caprolactone) (PCL-PEG-PCL) was synthesized, and a composite scaffold was fabricated. The composite scaffolds with 40 wt% n-CDAP contained well interconnected macropores around 400 μm, and exhibited a porosity of 7...
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Polyethylene glycol dinitrates (PEGN) with molecular weights between 400 and 20 000 g·mol-1 were prepared from polyethylene glycols by esterification with nitric acid/sulfuric acid in dichloromethane. The products were characterized by gel permeation chromatography. The yield of PEGN increases with increasing reaction temperature (0-40 °C) however large liberation of nitrogen oxides was observe...
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Polyethylene glycol (PEG) dehydrogenase in crude extracts of a PEG 20,000-utilizing mixed culture was purified 24 times by precipitation with ammonium sulfate, solubilization with laurylbetaine, and chromatography with diethylamino-ethyl-cellulose, hydroxylapatite, and Sephadex G-200. The purified enzyme was confirmed to be homogeneous by sodium dodecyl sulfate-polyacrylamide gel electrophoresi...
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Dispersive liquid-liquid microextraction method (DLLME) combined with high-performance liquid chromatography-ultraviolet detection (HPLC-UV) was used to determine thiamine (B1), nicotinamide (B3) and pyridoxine (B6) in sour cherry juice. This method was rapid, simple and sensitive. Separation was accomplished using a C18 column. The optimum chromatographic conditions were found to be: mobile ph...
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ژورنال
عنوان ژورنال: Journal of Separation Science
سال: 2009
ISSN: 1615-9306
DOI: 10.1002/jssc.200900014