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Related Concept Videos

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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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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HPLC-Based Chemometric Analysis for Coffee Adulteration.

Wai Lok Cheah1, Mingchih Fang1

  • 1Department of Food Science, College of Life Science, National Taiwan Ocean University, No 2, Beining Rd., Keelung City 20224, Taiwan.

Foods (Basel, Switzerland)
|July 9, 2020
PubMed
Summary

This study introduces a new non-targeted analysis using High-Performance Liquid Chromatography (HPLC) and Principal Component Analysis (PCA) to detect coffee adulteration. The method reliably distinguishes pure coffee from adulterated samples with a 5% detection limit.

Keywords:
PCAadulterationchemometricscoffeefood fraud

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Area of Science:

  • Analytical Chemistry
  • Food Science
  • Chemometrics

Background:

  • Coffee adulteration is a significant issue, often involving the addition of low-value materials like spent grounds or grains.
  • Traditional targeted High-Performance Liquid Chromatography (HPLC) methods for detecting adulteration are time-consuming.
  • A need exists for faster, more comprehensive analytical approaches to ensure coffee authenticity.

Purpose of the Study:

  • To develop and validate a non-targeted chemometric analysis for detecting coffee adulteration.
  • To utilize HPLC coupled with Principal Component Analysis (PCA) for efficient coffee authentication.
  • To assess the performance of PCA-based models in discriminating pure coffee from adulterated samples.

Main Methods:

  • Direct injection of liquid coffee into HPLC without extensive sample preparation.
  • Generation of HPLC chromatograms and subsequent analysis using Principal Component Analysis (PCA).
  • Development of two PCA-based models: one for discrimination and one for adulterant identification.

Main Results:

  • The HPLC-based chemometric approach successfully discriminated pure coffee from adulterated samples with a detection limit of 5%.
  • The first PCA model demonstrated high sensitivity (0.875) and specificity (0.938) in differentiating coffee from adulterated mixtures.
  • The second model showed limitations in identifying specific adulterants, achieving only a 30% accuracy rate for distinguishing between soybeans, mung beans, or spent coffee grounds.

Conclusions:

  • HPLC-based chemometric analysis offers a reliable and efficient method for detecting coffee adulteration.
  • The developed non-targeted approach effectively distinguishes authentic coffee from adulterated products.
  • Further research is needed to enhance the capability of identifying specific adulterants in mixed samples.