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Related Concept Videos

High-Performance Liquid Chromatography: Introduction01:11

High-Performance Liquid Chromatography: Introduction

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High-performance liquid chromatography(HPLC), formerly referred to as High-pressure liquid chromatography, is a powerful technique used to separate, identify, and quantify components in complex mixtures. The term "high pressure" refers to using high pressure to push the liquid mobile phase through the tightly packed columns.
In HPLC, two phases play a critical role in the separation process:
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High-Performance Liquid Chromatography: Instrumentation00:57

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High-performance liquid chromatography, or HPLC, is an analytical technique that separates liquid samples under high pressures. An HPLC instrument consists of glass bottles for storing solvents called mobile phase reservoirs. HPLC-grade solvents are used to maintain high purity, and the dissolved gases are removed using a degasser, such as a vacuum pumping system or sparging with helium. The solvents are then pumped into the analytical column using a screw-driven syringe or reciprocating pumps.
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High-Performance Liquid Chromatography: Elution Process01:05

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In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
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High-Performance Liquid Chromatography: Types of Detectors01:15

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The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
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Anatomy of the Ear01:16

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Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
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Adrenergic Receptors: ɑ Subtype01:31

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Adrenoceptors are classified into α and ꞵ classes based on their potencies to catecholamine agonists. α-adrenoceptors show the following order of catecholamine potency:
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Determination of Gentamicin C-subtypes in Inner Ear Perilymph Using Liquid Chromatography with Fluorescence

Shreshtha Dash1, Molly T McDevitt1, D David Smith1

  • 1Bellucci Translational Hearing Center, Department of Biomedical Sciences, Creighton University School of Medicine, 2500 California Plaza, Omaha, NE 68178, USA.

Journal of Pharmaceutical and Biomedical Analysis
|February 10, 2026
PubMed
Summary

A new high-performance liquid chromatography method accurately measures gentamicin in tiny biological samples. This sensitive technique, using OPA-ethanethiol derivatization, is crucial for preclinical research involving gentamicin drug delivery.

Keywords:
AminoglycosidesDerivatizationEthanethiolOPAReversed-phase high performance liquid chromatography

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Area of Science:

  • Analytical Chemistry
  • Pharmacology

Background:

  • Gentamicin is a vital broad-spectrum aminoglycoside antibiotic.
  • Accurate quantification of gentamicin in biological fluids is essential for therapeutic drug monitoring and pharmacokinetic studies.

Purpose of the Study:

  • To develop and validate a novel, sensitive, and rapid reversed-phase high-performance liquid chromatography (RP-HPLC) method.
  • To enable simultaneous determination of gentamicin C-subtypes using OPA-ethanethiol derivatization.
  • To quantify gentamicin in small biological sample volumes, specifically perilymph from mouse inner ear.

Main Methods:

  • Development of an isocratic RP-HPLC method utilizing a C18 column.
  • Optimization of mobile phase composition (methanol, acetic acid, sodium 1-heptanesulfonate).
  • Derivatization of gentamicin with O-phthalaldehyde (OPA) and ethanethiol for fluorescence detection.

Main Results:

  • The method demonstrated excellent linearity (10-400 ng/mL) in artificial perilymph.
  • High sensitivity was achieved with a limit of detection (LOD) of 0.2 ng/mL and a limit of quantification (LOQ) of 10-11 ng/mL for all four major gentamicin C-subtypes.
  • The method was successfully validated according to USP guidelines for selectivity, linearity, accuracy, precision, and sensitivity.
  • Successful application in quantifying gentamicin in mouse perilymph samples.

Conclusions:

  • A simple, fast, and sensitive RP-HPLC-fluorescence method for gentamicin analysis was established.
  • The novel OPA-ethanethiol derivatization allows simultaneous determination of gentamicin C-subtypes.
  • This validated method is suitable for quantifying gentamicin in small volumes of biological samples, particularly in preclinical research.