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Related Concept Videos

Supercritical Fluid Chromatography01:18

Supercritical Fluid Chromatography

Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
SFC utilizes a supercritical fluid mobile phase,...
High-Performance Liquid Chromatography: Introduction01:11

High-Performance Liquid Chromatography: Introduction

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:
High-Performance Liquid Chromatography: Instrumentation00:57

High-Performance Liquid Chromatography: Instrumentation

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.
High-Performance Liquid Chromatography: Elution Process01:05

High-Performance Liquid Chromatography: Elution Process

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...
Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...

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Hypernated supercritical fluid chromatography: potential application for car lubricant analysis.

Gwenaelle Lavison-Bompard1, Fabrice Bertoncini, Didier Thiébaut

  • 1Laboratoire Chimies Analytiques Bioanalytiques et Miniaturisation (UMR PECSA CNRS-UPMC, ESPCI #7195), ESPCIParisTech, 10, rue Vauquelin, 75231 Paris Cedex 05, France.

Journal of Chromatography. A
|December 4, 2012
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Summary

This study introduces a multi-detector Supercritical Fluid Chromatography (SFC) system for analyzing car lubricant additives. The advanced system effectively identifies and characterizes base stocks and additives, aiding in lubricant quality control and aging studies.

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Area of Science:

  • Analytical Chemistry
  • Tribology
  • Petroleum Chemistry

Background:

  • Car lubricant additives enhance performance by improving viscosity, oxidation resistance, and engine wear protection.
  • Previous studies utilized Supercritical Fluid Chromatography (SFC) for additive elution but faced limitations in resolution.
  • Hyphenation with selective detectors like atomic emission and mass spectrometry was explored for additive identification.

Purpose of the Study:

  • To implement a packed-column SFC system coupled with multiple detectors (FID, UV, AED, FTIR, MS) for comprehensive lubricant analysis.
  • To characterize both mineral/semi-synthetic base stocks and low molecular weight additives in car lubricants.
  • To demonstrate the system's capability in identifying additives in packages and formulated lubricants, and monitoring lubricant aging.

Main Methods:

  • Development and implementation of a packed-column Supercritical Fluid Chromatography (SFC) system.
  • Coupling SFC with Flame Ionization Detector (FID), Ultraviolet (UV) detector, Atomic Emission Detector (AED), Fourier Transform Infrared (FTIR) spectroscopy, and Mass Spectrometry (MS).
  • Utilizing SFC/FID-UV-FTIR for base stock ester confirmation and combined AED/FTIR/MS data for additive identification and structure elucidation.

Main Results:

  • The SFC/FID-UV-FTIR configuration efficiently confirmed the presence of esters in lubricant base stocks.
  • The multi-hyphenated system successfully identified and partially elucidated the molecular structures of various additives in lubricant packages and formulations.
  • Combined data from AED traces and FTIR chemigrams allowed deduction of additive chemical families, further refined by MS interpretation.

Conclusions:

  • The implemented multi-hyphenated SFC system provides a powerful tool for the detailed characterization of car lubricant base stocks and additives.
  • This analytical approach enables accurate identification and structural determination of lubricant components, crucial for quality control.
  • The system is effective for monitoring lubricant aging, offering insights into performance degradation over time.