1H NMR spectroscopic discrimination of different beer styles combined with a chemical shift-based quantification approach

Autor: Martin Kaufmann, Katrin J. Schwarz, Thomas Kuballa, Meike Bergmann, André Dallmann
Rok vydání: 2021
Předmět:
Zdroj: European Food Research and Technology. 248:635-645
ISSN: 1438-2385
1438-2377
Popis: Craft breweries that tend to convince consumers with new interpretations of (ancient) beer styles increasingly influence the traditional beer market. Thereby, also ingredients not directly compliant with German beer purity laws come into use. Official food control currently faces the general problem of verifying food authenticity based on instrumental analytical methods. Related tasks in this field are the detection of non-labelled ingredients and the verification of product claims such as special food processing methods. For that purpose, chemometric analysis of high-resolution 1H NMR spectra was applied for the differentiation of related beer styles including also special beers. It could be shown that pilsner style beers, wheat beers, India pale ales, sour beers, and special beers can be easily differentiated applying consecutive principal component analysis. Thereby, it turned out that crafted pilsner style beers are distinguishable from industrial pilsner style beers based on their organic acid profiles. Furthermore, three conspicuous compounds present in two different batches of only one of the beer samples were identified as allyl alcohol, 1,3-propanediol, and 3-hydroxypropionic acid directly from the NMR spectra without any further analytical efforts. Finally, the present paper serves as a proof of concept that NMR-based quantification is also possible using chemical shift information instead of signal intensities/integrals—at least in special cases.
Databáze: OpenAIRE
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