terclim by ICS banner
IVES 9 IVES Conference Series 9 OIV 9 OIV 2024 9 Short communications - Oenology, methods of analysis 9 Direct SPME GC-MS determination of volatile congeners in wines without sample pre-treatment

Direct SPME GC-MS determination of volatile congeners in wines without sample pre-treatment

Abstract

In this study, the “Ethanol as an Internal Standard” method was employed for the SPME GC-MS quantification of volatile congeners in wines. This method is fast, cheap, and simple, as it requires no sample pre-treatment beyond dilution with water. A series of standard solutions containing 10 commonly encountered wine congeners was prepared gravimetrically to test the method’s linearity and sensitivity. The proposed method was then compared to the traditional internal standard (IS) method, using 1-pentanol as the IS compound. Although the precision and linearity for some compounds were slightly lower when using the proposed method, these issues can be mitigated through further optimization of the SPME methodology. In terms of accuracy, the proposed method exhibited similar recoveries to the traditional IS method. Ten real wine samples (five white and five red) produced in Austria were simultaneously analysed using both IS methods for comparison. The results showed that over 90% of the obtained data (mean concentrations of individual congeners from both IS methods) did not differ significantly (p=0.05). Given its significant advantages, the “Ethanol as an Internal Standard” method is recommended for routine wine analysis.

Direkte bestimmung flüchtiger verbindungen in wein ohne probenbehandlung

In dieser arbeit wurde die methode “ethanol als interner standard” zur spme-gc-ms-quantifizierung flüchtiger kongenere in weinen verwendet. Unser ziel war es, eine schnelle und einfache methode der weinanalyse ohne zusätzliche verfahren, reagenzien usw. Zu entwickeln. Eine reihe von standardlösungen, die einige häufig vorkommende kongenere im wein enthalten, wurde gravimetrisch vorbereitet. Die vorgeschlagene methode wurde mit der traditionellen methode des internen standards verglichen. 1-pentanol wurde als traditionelle is-verbindung verwendet. 10 echte weinproben (5 weiße und 5 rote) wurden mit beiden methoden analysiert, um sie zu vergleichen.  Es wurde festgestellt, dass das vorgeschlagene verfahren in der routinemäßigen weinanalyse eingesetzt werden kann. Probleme mit der linearität für einige verbindungen können durch zusätzliche optimierung der spme-experimentparameter gelöst werden. Hinsichtlich der metrologie wurde festgestellt, dass die vorgeschlagene methode eine ähnliche wiederholbarkeit und rückgewinnungsraten wie die traditionelle is-methode aufweist. Die nachweis- und bestimmungsgrenzen waren jedoch höher für die vorgeschlagene methode. Die analyse von weinproben ergab, dass 10% der erhaltenen ergebnisse (mittlere konzentrationen einzelner kongenere, die mit beiden is erhalten wurden) signifikant unterschiedlich waren (p = 0,05).

прямое определение летучих веществ в вине без пробоподготовки

В этой работе метод с использованием этанола в качестве внутреннего стандарта был использовандля определения летучих примесей в винах методом spme gc-ms. Нашей целью было созданиебыстрого и простого метода анализа вина без дополнительных процедур, реагентов и прочего. Сериястандартных образцов, содержащих некоторые часто встречаемые в винах примеси, былаприготовлена гравиметрически. Предложенный метод был сравнен с традиционным методомвнутреннего стандарта. 1-пентанол был использован как классический внутренний стандарт. 10 реальных образцов вина (5 белых и 5 красных) были измерены двумя методами в целях сравнения.  Было обнаружено, что предложенный метод может быть использован в рутинном анализе вина. Проблемы с линейностью для некоторых компонентов могут быть решены дополнительнойоптимизацией процесса экстракции. С точки зрения метрологии, предложенный методхарактеризуется схожей с традиционным методом повторяемостью и величинами извлечениядобавок. Однако, пределы обнаружения и определения у предложенного метода были нескольковыше. Анализ реальных образцов вина показал, что 10% полученных результатов (среднееконцентрациий индивидуальных аналитов полученных двумя методами внутреннего стандарта) имеют значимое отличие при уровне значимости p=0.05.

DOI:

Publication date: November 18, 2024

Issue: OIV 2024

Type: Article

Authors

Anton Korban¹, Goessler Walter², Radomir Čabala1

1 Faculty of Science of Charles University in Prague, Hlavova 2030/8, 128 00, Prague, Czech Republic
2 Faculty of Chemistry of University of Graz, Universitaetsplatz 1, 8010, Graz, Austria

Contact the author*

Tags

Full papers OIV 2024 | IVES Conference Series | OIV | OIV 2024

Citation

Related articles…

Viticultura protegida: uso de mallas sombreadoras fotoselectivas como una herramienta para enfrentar la crisis climática en uva de mesa en el norte de Chile

The production of table grapes in Chile is of great importance, being one of the main established fruit crops with over 43,000 hectares distributed across a diverse climate range, from the southern limit of the Atacama desert to the mediterranean zone. Chile is also one of the leading exporters of table grapes. producers must confront the challenges posed by the climate crisis, such as decreased rainfall, increased heatwaves, and extreme temperature events during the growing season, mainly associated with desertification in northern Chile (Atacama and Coquimbo regions).

How do KOCs influence wine consumers’ decisions? Based on NLP analysis and questionnaire surveys on Xiaohongshu

In China’s social media-driven marketing landscape, user-generated content (UGC) plays a pivotal role in brand communication and consumer decision-making.

An analysis of wine geographical indications from the perspective of the theory of industrial organizations: what are the trade off?

From Porto and then through Bordeaux, Champagne and Bourgogne, wine geographical indications (gi) were the driving models for this form of protection of distinctive signs for collective use. Many studies present the benefits of recognizing a gi for a given region, the challenges of its implementation, as well as the possibilities of promoting territorial development.

Water recharge before budbreak and/or deficit irrigation during summer: agronomic effects on cv. Tempranillo in the D.O. Ribera del Duero

The availability of water in the soil and the water status of the vineyard are proving to be determining factors for crop management in the current context of climatic variation

Impacts of climate change on wine producer countries located north of the wine belt

Climate change poses significant challenges to the global wine sector, with cool-climate countries particularly vulnerable to its effects. The research employs a panel data analysis to investigate the impact of climate change on the wine industry in 66 countries, focusing on 11 cool-climate countries located north of the wine belt in the northern hemisphere. Utilizing data from OIV, FAO and climatic statistics from the climate change knowledge portal of the world bank spanning from 1961 to 2020, the research examines the relationship between temperature, precipitation, and wine production.