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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.
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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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Interference and Diffraction02:18

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Interference Assessment for High-Performance Liquid Chromatography HbA1c Assays.

Linghao Zhao1, Wei Yang2, Shengjin Cui3

  • 1Department of IVD Research and Development, Lirimax (Tianjin) Medical Technology Co. Ltd., Tianjin, China.

Biomedical Chromatography : BMC
|February 3, 2026
PubMed
Summary
This summary is machine-generated.

Laboratory interference can cause inaccurate hemoglobin A1c (HbA1c) results. This study identified specific substances like cholic acid, low pH, and ethanol that interfere with HbA1c measurements, providing thresholds for clinical interpretation.

Keywords:
HbA1cendogenousexogenousinterferenceinterfering substance

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Area of Science:

  • Clinical Chemistry
  • Analytical Chemistry
  • Laboratory Medicine

Background:

  • Laboratory errors, particularly interference, significantly impact measurement accuracy.
  • Accurate clinical laboratory results are essential and must be free from interference.

Purpose of the Study:

  • To evaluate the interference of endogenous and exogenous substances on hemoglobin A1c (HbA1c) measurements using ion exchange high-performance liquid chromatography.
  • To determine interference concentration thresholds for various substances across different HbA1c analyzer brands.

Main Methods:

  • Ion exchange high-performance liquid chromatography (HPLC) was used to analyze HbA1c.
  • 12 endogenous and 24 exogenous substances were added to hemoglobin solutions at varying HbA1c levels to simulate clinical samples.
  • Interference screening and dose-response experiments were conducted to identify and quantify interference effects.

Main Results:

  • Endogenous cholic acid and low pH elevate HbA1c values above interference thresholds.
  • Exogenous ethanol causes increased HbA1c in low-value samples and decreased values in high-value samples.
  • While analyzer brands showed slight differences in interference thresholds, these were not statistically significant.

Conclusions:

  • Established interference concentration thresholds and identified key interfering substances (cholic acid, low pH, ethanol).
  • Provides crucial data for clinical laboratory experts to accurately interpret HbA1c testing results.
  • Aids in mitigating laboratory errors caused by interference in HbA1c analysis.