prEN 18338
Maisto autentiškumas. Vaisių ir daržovių sulčių ir susijusių produktų mėginių paruošimas izotopų santykio analizei
Standarto projektas Viešoji apklausaProjekto etapai
1. Decision on WI Proposal
2. Projektas
3. Viešoji apklausa
Nuo 2026-04-10
iki 2026-06-09
4. Closure of enquiry
5. Submission to Formal Vote
Organizacija
CEN Europos standartizacijos komitetasICS
67.050 - Bendrieji maisto produktų tyrimo ir analizės metodaiUžsienio technikos komitetas
CEN/TC 460Komentarų skaičius
0Komentavimo pradžia
2026-04-10Taikymo sritis
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.