• Archives of Pharmacal Research
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• v.17 no.5
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• pp.378-380
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• 1994

The hydrolysis of metampicillin to ampicillin was investigated using high perofrmance liquid chromatography. We developed the simultaneous determination of metampicillin and ampicilin using a Zorbox CN column and 5% acetonitrile and 8% methanol in 0.02 M phosphate buffer (pH 7.0) as mobile phase. Matampicillin was hdyrolyzed to ampicillin with half life of 41.5 min at physiological pH and temperature. In acdic pH, metampicillin was rapidly hydrolyzed to ampicillin within a chromatogrphic separation.

• Journal of the Korean Applied Science and Technology
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• v.6 no.1
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• pp.27-30
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• 1989

The fast separation and determination of cefatrizine${\cdot}$propylene glycol and inmpurities - TACA: 7-amino-3-(1,2,3-triazol-4-yl)thiomethyl-3-cephem-4-carboxylic acid and 7-ACA; 7-amino cephalosporanic acid - was performed by the high poerformance liquid chromatography using octadecyl siland (ODS) column. Methanol and ammonium phosphate buffer [$0.03M(NH_4)_2\;HPO_4$, (pH 7.5)] was used analyze, as eluent. The experimental value of the contents of cefatrizine${\cdot}$propylene glycol and impurities agree with the theoretical value of those.

• Archives of Pharmacal Research
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• v.26 no.8
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• pp.606-611
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• 2003

Byakangelicin, 9-(2,3-dihydroxy-2-methylbutoxy)-4-methoxy-7H- furo[3,2-g][l]benzopyran-7-one (BKG), a component of Angelicae dahuricae Radix, is considered to be an inhibitor of aldose reductase for the treatment of diabetic cataract. An analytical method for the isolation of BKG developed by high-performance liquid chromatography has been reported. No literature on the metabolism of BKG, however, has been found. With the purpose of identifying new metabolites of BKG, BKG (100 mg/kg) was orally administered to Sprague-Dawley rats via a gavage. Using a metabolic cage, urine was collected for 24 h, and the urine samples were extracted by liquid-liquid extraction. For structural identification of new urinary metabolites of BKG, various instrumental analyses were conducted by gas-chromatography/mass spectrometry, high-performance liquid chromatography/diode array detector, liquid chromatography/mass spectroscopy with thermospray interface and $^1H$ nuclear magnetic resonance spectroscopy. Two metabolites produced from the Ο-demethylation or Ο-dealkylation of BKG were newly identified, and another new but unknown metabolite was assumed to be the hydroxylated form of BKG. These results indicate that the major metabolic products of BKG are formed by Ο-demethylation or Ο-dealkylation of BKG side chains.

• YAKHAK HOEJI
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• v.29 no.1
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• pp.50-54
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• 1985

Seven different sorbents were evaluated for their adsorptivity and desorptivity of antibiotic, chloramphenicol. Among the sorbents studied, Carbopak B was found to be the most efficient in enriching the chloramphenicol from dilute aqueous solution. Interfering components in the milk matrix could be washed off by water and petroleum ether from Carbopak B column, while the chloramphenicol was retained on the surface of Carbopak B. The method of simple and efficient purification and enrichment of chloramphenicol using Carbopak B, followed by quantitative analysis employing $C_{18}$ reversed phase high performance liquid chromatography has been applied to the determination of chloramphenicol in milk.

• Proceedings of the PSK Conference
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• 2002.10a
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• pp.418.3-419
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• 2002

Enalapril. a prodrug. is the ethyl ester of a long-acting angiotensin converting enzyme inhibitor. enalaprilat. Because enalapril does not contain any appreciable chromophore. detection of the drug in a complex matrix (e.g.. biological fluids) has been problematic with conventional detection systems in high-performance liquid chromatography (HPLC). As a result. determination of enalaprillevel in blood samples has been typically carried out using HPLC-MS/MS in the literature. (omitted)

• Korean Journal of Pharmacognosy
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• v.24 no.4
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• pp.309-312
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• 1993

A new method for separation and quantitative determination of isoflavone glucosides in rhizomes of Belamcanda chinensis (Iridaceae) by high performance liquid chromatography was elaborated. A reverse-phase system with a Spheri-5 RP-18 column using MeOH:HOAc:$H_2O$(24 : 5 : 71) as a mobile phase was developed. The isoflavonoids were detected at 268 nm and the analysis was successfully carried out within 15 min.

• Proceedings of the PSK Conference
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• 2002.10a
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• pp.423.1-423.1
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• 2002

A simple. specific and sensitive method for the determination of cyclosporine A (CsA) in human serum has been developed by a high performance liquid chromatography/diode array detector (DAD) and applied to pharmacokinetic study of CsA. This method involves the use of solid phase extraction procedure following rapid protein precipitation with zinc sulphate from 1 $m\ell$ of human serum, using a disposable $C_{18}$ extraction cartridge. (omitted)

• Proceedings of the PSK Conference
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• 2003.04a
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• pp.305.1-305.1
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• 2003

A simple, specific and sensitive method for the determination of levofloaxcin (LFX) in human serum was developed by a high performance liquid chromatography/diode array detector and applied to pharmacokinetic study of LFX in human volunteers. This method involves several steps such as precipitation with acetonitrile, extraction with methylene chloride, evaporation, and concentration, using 0.5ml of the serum. (omitted)

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.16 no.1
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• pp.9-18
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• 2010

For screening test of the non-volatile compounds which migrate from food packaging materials into foodstuffs, the traditional high performance liquid chromatography (HPLC) systems suffer from the lack of universal detector with high sensitivity and universality and high efficiency HPLC separation column which provides complete separation of complex mixtures into all individual substances. In this work, the use possibility of online two-dimensional liquid chromatography (2D-LC) system coupled with a charged aerosol detector (CAD), a universal detector, was reviewed. 2D-LC system permits to improve peak capacity and resolving power for complex mixtures. Charged aerosol detector (CAD) offers a new feasibility for detection of any non-volatile compounds with high sensitivity and constant response factor in a calibration range. The combination of size exclusion chromatography (SEC) and normal phase HPLC (NP-HPLC) is most frequently used for the separation of the natural and synthetic polymers which are mainly used as raw materials for the manufacture of food packaging materials. However, there is no commercial software available for data acquisition and handling and therefore the quantification in 2D-LC analysis is still rare.

• Fisheries and Aquatic Sciences
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• v.15 no.2
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• pp.107-115
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• 2012

In developing a useful tool to detect parasitic dynamics in an estuarine ecosystem, a denaturing high-performance liquid chromatography (DHPLC) assay was optimized by cloning plasmid DNA from the grass shrimp Palaemonetes pugio, and its two parasites, the trematode Microphallus turgidus and bopyrid isopod Probopyrus pandalicola. The optimal separation condition was an oven temperature of $57.9^{\circ}C$ and 62-68% of buffer B gradient at a flow rate of 0.45 mL/min. A peptide nucleic acid blocking probe was designed to clamp the amplification of the host gene, which increased the amplification efficiency of genes with low copy numbers. Using the DHPLC assay with wild-type genomic, the assay could detect GC Gram positive bacteria and the bopyrid isopod (P. pandalicola). Therefore, the DHPLC assay is an effective tool for surveying parasitic dynamics in an estuarine ecosystem.