prEN 18338
Food authenticity - Sample preparation for isotope ratio analysis of fruit and vegetable juices and related products
Draft Public enquiryProject stage codes
1. Decision on WI Proposal
2. Projektas
3. Viešoji apklausa
From 2026-04-10
till 2026-06-09
4. Closure of enquiry
5. Submission to Formal Vote
Organisation
CEN Europos standartizacijos komitetasICS
67.050 - General methods of tests and analysis for food productsForeignTC'S
CEN/TC 460Number of comments
0Comment start date
2026-04-10Scope
This document describes a method for sample preparation for the determination of C, N and H isotope ratio values in different fractions (sugar and pulp) of fruit and vegetable juices and their derivatives (concentrates, nectars, beverages etc.) by Elemental Analyser-Isotope Ratio Mass Spectrometry (EA-IRMS) or Isotope Ratio Measurement-Deuterium Nuclear Magnetic Resonance Spectroscopy (irm-2H-NMR). It also covers ethanol produced by the fermentation of fruit and vegetable juices, and their derivatives. Sample measurement is not included within this document. This document does not concern the analytical methods after sample preparation, namely methods using IRMS (Isotope Ratio Mass Spectrometry) technique and isotope ratio measurement-deuterium nuclear magnetic resonance spectroscopy (irm-2H-NMR), also known as SNIF-NMR (Site-specific Natural Isotopic Fractionation by Nuclear Magnetic Resonance), used to quantify the isotopic ratios of the following nuclei: 13C/12C, 15N/14N and 2H/1H. The interpretation of the obtained isotope delta values is not covered by this document.