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…

The influence of RNAi-expressing rootstocks in controlling grey mold on grapevine cultivars

Worldwide, with an average of 6.7 million cultivated hectares, of which exclusively 51% in Europe (faostat, 2021), the production of table and wine grapes is a leading sector, with continued growth in Europe in the area devoted to vine cultivation. during the growing season, most of the plant organs can be susceptible to several fungal and oomycete diseases, leading to important economic losses and causing detrimental effects on fruit quality. the increasingly scarce availability of fungicidal products, often also related to their relative impact on the environment, coupled with the emergence of resistance in the pathogen to these products, make defence increasingly challenging.

Unveiling the bioactive potential of aglianco grape pomace: oleanolic acid as a promising natural product

The winemaking industry generates a substantial amount of byproducts, including grape pomace, which is often discarded as waste. However, this seemingly useless material holds a wealth of bioactive compounds with potential health benefits. Recognizing the value of circular economy principles, this study delves into the comprehensive chemical analysis of aglianco grape pomace, aiming to transform this byproduct into a valuable resource.

Transforming the grapevine world through new breeding techniques

Climate change and environmental degradation are existential threats to europe and the world. One of the most important objectives is to reduce by 2030 the use and the risk of chemical pesticides and fertilisers, reducing nutrient losses and increasing organic farming. Grapevine (vitis spp.) is one of the major and most economically important fruit crops worldwide. It is characterised by high levels of genetic diversity, as result of natural genetic mutations, which are common in grapevines and further assisted by ongoing vegetative propagation.

Applying value proposition design to collective strategic actions in family wineries: enhancing territorial resources in Vale dos Vinhedos, Brazil

The study aims to propose collective strategic actions for family wineries, promoting their competitiveness and the valorization of territorial resources.

Alcohol preference and health behaviors in patients with cardiometabolic diseases: insights from the multi-center iact cross-sectional study

Recognizing the influence of alcohol preference on health behaviors is essential for developing tailored interventions that effectively promote healthier lifestyles and optimize disease management strategies in the vulnerable population of patients with cardiometabolic diseases (CMD). The present study aims to provide valuable insights into how alcohol preference relates to dietary habits and medication adherence among patients with CMD diseases.