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Sedimentological and palaeoecological significance of the trace fossils of the Jurassic rocks of the Jhura Dome, Mainland Kachchh, western India

Patel S. J., Patel N. J.

Volumina Jurassica

2015

Vol. 13, no. 2

101--139

The Middle to Late Jurassic succession of the Jhura Dome (Jhurio and Jumara formations) of the Mainland Kachchh, western India, comprises a ~500 m thick succession of clastic carbonates and mixed siliciclastic-carbonates, intercalated with shales. The sequence, as based on sedimentological characteristics, exhibits six sedimentary facies and four subfacies. Certain exceptional bands of the ripplemarked calcareous sandstone, shale and oolitic limestone facies are rich in ammonites, belemnites, brachiopods and bivalves. Thirty four ichnogenera were also identified and analysed paleoecologically. These trace fossils represent five ethological categories and six ichnoassemblages. Seventeen ichnoguilds are demonstrated based on space utilization for characterising the ecological complexity of ichnoassemblages. Bathymetric control of the trace fossils resulted with development of Skolithos, Cruziana and Zoophycos ichnofacies type conditions. The sedimentological and ichnological data analysis revealed seven distinctive depositional regimes ranging from offshore shelf below storm wave base to middle shoreface.

Validated reversed-phase high-performance liquid chromatographic and high-performance thin-layer chromatographic methods for simultaneous analysis of tamsulosin hydrochloride and dutasteride in pharmaceutical dosage forms

Patel D. B, Patel N. J.

Acta Chromatographica

2010

Vol. 22, no. 3

419--431

In this research paper we describe validated high-performance liquid chromatographic (HPLC) and high-performance thin-layer chromatographic (HPTLC) methods for simultaneous analysis of tamsulosin hydrochloride and dutasteride in tablet formulations. HPLC was performed on a C 18 column with 85:15 ( υ/υ ) methanol-0.02 M ammonium acetate buffer (pH 9.5, adjusted with triethylamine) as mobile phase. HPTLC was performed on aluminium foil-backed silica gel G60F 254 layers with toluene-methanol-triethylamine 9:1.5:1 ( υ/υ/υ ) as mobile phase. In HPLC, quantification was achieved by photo diode-array (PDA) detection at 274 nm over the concentration range 1–20 μg mL -1 for both; mean recovery was 98.18 ± 0.698 and 99.94 ± 0.611% for TAM and DUTA, respectively. In HPTLC, quantification was achieved by UV detection at 280 nm over the concentration range 200–2000 ng per band for both; mean recovery was 99.66 ± 0.892 and 100.05 ± 1.012% for TAM and DUTA, respectively. These methods are simple, precise, and sensitive, and are suitable for simultaneous analysis of TAM and DUTA in tablet formulations.