Rotwein unter Hochspannung: Mehrjährige Qualitäts

10. Wissenschaftstagung Ökologischer Landbau.
Beitrag archiviert unter http://orgprints.org/view/projects/int_conf_2009_wita.html

Rotwein unter Hochspannung: Mehrjährige Qualitäts-Untersuchung mit Gas-Discharge-Visualisation (GDV)

C.Bigler1 , D. Levite2, M. van der Meer2, A. Kaufmann3 und F.P.Weibel2

Keywords: GDV, wine, bio-dynamic, quality, holistic methods

Abstract


We investigated whether we can detect any differences in red wines produced either by bio-dynamic or by standard organic agriculture. We used standard methods to investigate the quality of the wines and Gas-Discharge-Visualisation (GDV) method to investigate a holistic quality of the wines. With the GDV-method, samples are exposed to high voltage. The halo-like gas discharge caused by a burst of electron emission of the sample is captured by a digital camera underneath a transparent, dielectric surface. The wine samples measured originate from an On-Farm experiment in South of France with two separately managed but neighbouring blocks (same soil and climate conditions): bio-organic and bio-dynamic. Apart from the use of bio-dynamic
preparations, plant protection and fertilization was the same in both blocks. The vinification of the sampled grapes was made in two replicates which were analysed separately. During the three years of examination, the bio-dynamic samples did not reveal significant differences when assessed with standard methods (sensory triangle test, polyphenol analysis etc.). However, with GDV measurements the values for the image-parameter “mean intensity” were mostly higher for the wines from biodynamically produced grapes. In a „mixed effect model“ (GDV-parameter „mean intensity“ as dependent variable, replication und cultivation-system as fix and year as random effect) the difference was statistically significant. We conclude that the GDVmethod has an interesting potential to detect very sensitively differences in food attributes. However, in order to interpret the results in terms of consumer-relevant quality further research is needed.
Einleitung und Zielsetzung
Die Anwendung biologisch-dynamischer Präparate in der Weinproduktion hat in den letzten Jahren an Bedeutung gewonnen. Die Substanzen werden in homöopathischen Dosen angewendet. Der Einfluss der Präparate auf die Qualität und die Eigenschaften des Endproduktes lassen sich mit  herkömmlichen Methoden schwer nachweisen. Ziel dieser Untersuchung war es, abzuklären, ob die nicht-destruktive ganzheitliche Methode der „Gas-Discharge-Visualisation“ (GDV) einen Einfluss der biologischdynamischen
Bewirtschaftungsweise auf die biophysikalischen Eigenschaften des Weins im hochfrequenten Hochspannungsfeld feststellen kann. Die GDV-Methode befindet sich hinsichtlich der Untersuchungen an Lebensmitteln in einer Pionierphase.
Die Untersuchungen der letzten Jahre (Bigler et al, 2007; Bigler, 2006; Weibel et al, 2005; Sadikov et al, 2004) haben dazu beigetragen, die Messverfahren bezüglich Handhabung und Datenqualität deutlich zu verbessern.

Full text: 2009_Bigler_wine

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