Differentiation of Organically and Conventionally Grown Tomatoes by Chemometric Analysis of Combined Data from Proton Nuclear Magnetic Resonance and Mid-infrared Spectroscopy and Stable Isotope Analysis

Autor: Monika Hohmann, Helmut Wachter, Sarah Erich, Ulrike Holzgrabe, Norbert Christoph, Yulia B. Monakhova

Publikováno v: Journal of Agricultural and Food Chemistry. 63:9666-9675

Because the basic suitability of proton nuclear magnetic resonance spectroscopy ((1)H NMR) to differentiate organic versus conventional tomatoes was recently proven, the approach to optimize (1)H NMR classification models (comprising overall 205 auth

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2482b7b13b366291d772d89a99e23843
https://doi.org/10.1021/acs.jafc.5b03853

Stable Isotope Ratio Analysis for Authenticity Control

Autor: Gerhard Krammer, Wiebke Zander, Norbert Christoph, Antje Schellenberg

Publikováno v: Springer Handbook of Odor ISBN: 9783319269306

This chapter summarizes terms, definitions, and reference materials used for stable isotope ratio analysis (SIRA ) of the bioelements hydrogen, carbon, and oxygen. The principles of biotic and abiotic fractionation in biomolecules like flavor compoun

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::49bb35ffa62ab0d6382e998871316497
https://doi.org/10.1007/978-3-319-26932-0_20

Improved classification of fused data: Synergetic effect of partial least squares discriminant analysis (PLS-DA) and common components and specific weights analysis (CCSWA) combination as applied to tomato profiles (NMR, IR and IRMS)

Autor: Helmut Wachter, Douglas N. Rutledge, Yulia B. Monakhova, Norbert Christoph, Monika Hohmann

Publikováno v: Chemometrics and Intelligent Laboratory Systems
Chemometrics and Intelligent Laboratory Systems, Elsevier, 2016, 156, pp.1-6. ⟨10.1016/j.chemolab.2016.05.006⟩

Discriminant analysis (DA) methods are well-known chemometric approaches for solving classification problems in chemistry. Recently, specific multiblock methods, such as common components and specific weights analysis (CCSWA), have been developed whi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ccb6324e87d0ec793080b7550b3aff42
https://hal.archives-ouvertes.fr/hal-01532592

Quantitative ¹H NMR analysis of egg yolk, alcohol, and total sugar content in egg liqueurs

Autor: Monika, Hohmann, Verena, Koospal, Claudia, Bauer-Christoph, Norbert, Christoph, Helmut, Wachter, Bernd, Diehl, Ulrike, Holzgrabe

Publikováno v: Journal of agricultural and food chemistry. 63(16)

Analyzing egg liqueurs for compliance with legal requirements means several different time-consuming preparations and analytical processes. In this paper, we describe the approach to use quantitative (1)H NMR spectroscopy as an accurate alternative t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::738b09a161dd750757c3929149d49cdf
https://pubmed.ncbi.nlm.nih.gov/25860435

‘Untypical aging off-flavor’ in wine: formation of 2-aminoacetophenone and evaluation of its influencing factors

Autor: Norbert Christoph, Martin Geßner, Hans Steinhart, Thomas J. Simat, Hans-Jürgen Köhler, K. Hoenicke

Publikováno v: Analytica Chimica Acta. 458:29-37

2-Aminoacetophenone (AAP) is known as the character impact compound responsible for the so called untypical ‘aging off-flavor’ (UTA) in Vitis vinifera wines. The formation of AAP is caused by an oxidative degradation of the phytohormone indole-3-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::486092fcc3ee98cc40298fe41cd1614a
https://doi.org/10.1016/s0003-2670(01)01523-9