Method Comparison Used in Isotope Analysis of Wine


EIM Method (IRMS Technology)

Features:

  • More accurate results than NMR method
  • Inexpensive and readily available compared to NMR equipment

Advantages:

  • Ability to report illegal practices in unknown wines
  • Low cost of analysis
  • Short time of analysis (2 minutes per sample)
  • Patented Method

Disadvantages:

  • Sample preparation is performed offline
  • Development of automated sample preparation and analysis in progress

NMR Technology

Features:

  • Only used for measuring of (D/H)I and (D/H)II in wine ethanol samples to detect sugar addition which originates from sugar beet and corn

Advantages:

  • Only recognized method for determining addition of sugar in wine
  • Patented Method

Disadvantages:

  • Occupies large work space
  • Long time of analysis ( it takes few hours per sample)
  • Large consumption of liquid nitrogen and helium gas
  • Can not give precise information for the unknown wine samples
  • Used only for high quality wines with designated origin requiring databank information so that authenticity of the sample could be determined
  • Very expensive due to equipment cost and time of analysis
  • High annual maintenance cost
  • Additional equipment needed for sample preparation