| Autor: |
Herbert-Pucheta José Enrique, Hernández-Rangel Álvaro Omar, Vargas-Díaz María Elena, Sánchez Karla Hernández, Zepeda-Vallejo Luis Gerardo, Jiménez-García Montserrat |
| Jazyk: |
English<br />French |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
BIO Web of Conferences, Vol 68, p 02004 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2117-4458 |
| DOI: |
10.1051/bioconf/20236802004 |
| Popis: |
Present work stresses a novel analytical approach for increasing the specificity of standard NMR approaches for identifying polydimethylsiloxane (PDMS) and further silicone moieties in wines’ organic extracts, by including a second dimension that correlates chemical shifts with diffusion coefficients by means of pulsed-field gradient diffusion ordered spectroscopy (DOSY-NMR). Each silicone source in wines is unambiguously assigned by correlation of both local chemical environments and by a unique diffusion coefficient value, in turn related to a hydrodynamic radius (RH) that can be obtained with respect proper internal standards. Obtained PDMS diffusion coefficient values and hydrodynamic radii in wines’ extracts, in agreement with expected values, present a selectivity and specificity so far not reported, that positions DOSY-NMR spectroscopy as an alternative in oenology for controlling PDMS limits. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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