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7421
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7422
Development and Validation of an Ion-Pair HPLC-UV Method for the Quantitation of Quinoline and Indoloquinoline Alkaloids in Herbal and Pharmaceutical Antimalarial Formulations
Published 2022-01-01“…The separation/quantitation of the alkaloids (including quinine, quinidine, cinchonine, cinchonidine, dihydroquinine, dihydroquinidine, and cryptolepine) was achieved on a Zorbax SB-CN column (250 mm × 4.6 mm, 5 μm), with an isocratic elution system of methanol: trifluoroacetic acid (0.1%, v/v) (15 : 85, v/v) at 1.5 mL/min and 223 nm. …”
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7423
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7424
ALMA Observations of Solar Spicules in a Polar Coronal Hole
Published 2025-01-01“…The spicules observed at mm- λ are seen in absorption against coronal EUV emission, allowing us to estimate the column depth of neutral hydrogen. Spicular emission at mm- λ , due to thermal free–free radiation, allows us to estimate the electron number density as a function of height. …”
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7425
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7426
Extraction, Enrichment, and Quantification of Main Antioxidant Aglycones of Flavonoids and Tannins from Melastoma Dodecandrum Lour.: Guided by UPLC-ESI-MS/MS
Published 2019-01-01“…After the antioxidants were dynamically saturated by HPD 500, the column was eluted with different concentrations of ethanol (0, 25, 50, 75, and 100%, v/v). …”
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7427
Use of Nanostructured Layered Double Hydroxides as Nanofilters in the Removal of Fe2+ and Ca2+ Ions from Oil Wells
Published 2018-01-01“…The XRD pattern for Ca-Al-SO4 LDHs was quite different, showing the presence of low-angle peaks at 2θ = 11.68 and 14.72°. The results of the column adsorption studies showed that there was a significant removal of Ca2+ by all the compounds under investigation with an efficiency of 84–99%. …”
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7428
High-Performance Liquid Chromatographic Ultraviolet Determination of Memantine Hydrochloride after In Vitro Transdermal Diffusion Studies
Published 2013-01-01“…Separation was carried out with a 150 mm Kromasil C18 column at room temperature. The detection response, at 218 nm, was found to be linear in the concentration range from 0.5 to 50 μg/mL. …”
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7429
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7430
Liquid chromatography-high resolution mass spectrometry based analysis of persistent mobile organic compounds in aqueous samples: Method development and optimization
Published 2025-03-01“…A central composite design and desirability function (DF) approach were used to optimize the HRMS analysis, while the most suitable SPE cartridge, column, and mobile phase composition were carefully selected through experimental trials. …”
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7431
Current Updates on Molecular Diagnostic Assays Used for Detection of <i>Candida auris</i>: A Systematic Review
Published 2025-01-01“…This review summarized the key updates on three categories, including (i) sample pre-extraction procedures and nucleic acid extraction, including magnetic, bead-beating, mechanical, chemical, thermal, and column-based protocols; (ii) commercial molecular assays; and (iii) laboratory-developed tests (LDTs). …”
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7432
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7433
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7434
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7435
UPLC-MS/MS Method for Givinostat in Rat Plasma: Development, Validation, in vivo Pharmacokinetics Study and in vitro Metabolic Stability Research
Published 2025-01-01“…The analyte (givinostat) and IS were gradient eluted on a Waters ACQUITY UPLC BEH C18 column (1.7 μm, 2.1 × 50 mm) with 0.1% formic acid (A) and acetonitrile (B) as the mobile-phase system. …”
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7436
Qualitative and Quantitative Analysis of Volatile Components of Zhengtian Pills Using Gas Chromatography Mass Spectrometry and Ultra-High Performance Liquid Chromatography
Published 2016-01-01“…Baseline separation was achieved on an XB-C18 column with linear gradient elution of methanol-0.2% acetic acid aqueous solution. …”
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7437
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7438
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7439
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7440
