Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Metals involved in the colour of wine

15.11.2005


A University of Navarre research team, made up of Irene Esparza, José María Fernández, Carolina Santamaría, María Isabel Calvo and José Mª García-Mina, have studied the influence of a number of metals in giving wine its colour. The work concluded that a slight change in these elements substantially modifies certain aspects of the quality of the ferments.

Scientists know that colour is one of the main parameters that enable the excellence of the product to be measured, providing as it does information about structure, body and taste. In fact, it is known that the hues, varying from bluish red to an earthy orange, are influenced by -amongst other factors – the stability and reactivity of metals present, such as iron, zinc, copper and manganese.

To carry out the study, they took samples of the Tempranillo variety of grape from a plot supervised by Evena (the Navarre Viniculture and Enological Station), located in Erriberri (Olite) in Navarre. The sample musts and wines were taken from three successive harvests starting in 2002 and which were subject to identical fermentation treatments, the only differentiating factor being meteorological conditions.



Using this method, the preferred location for the metal components in the grape seeds was identified and also how their proportion is modified during the fermentation process. The results show that most iron concentrates in the skin of the seed and that the amount of this metal, together with that of copper, drops considerably in the first days of fermentation.

Shades of colour a la carte

Moreover, the researchers derived a mathematical expression that enables the quantification of these colour changes in a precise way, thanks to which "the wine-producer can measure the shade of colour with great precision and thereby have objective indexes of quality". This will be published shortly in the specialised magazine, Analytica Chimica Acta.

They also concluded that a small quantity of iron in wines produces an increase of between 8% and 30% of its blue component, with a consequent similar decrease in its percentage of red. Finally, in subsequent studies results will be presented as a function of varying the quantity of other metals, such as aluminium or copper, in order to determine the effect on changes in colour.

Garazi Andonegi | alfa
Further information:
http://www.basqueresearch.com

More articles from Life Sciences:

nachricht A Map of the Cell’s Power Station
18.08.2017 | Albert-Ludwigs-Universität Freiburg im Breisgau

nachricht On the way to developing a new active ingredient against chronic infections
21.08.2017 | Deutsches Zentrum für Infektionsforschung

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

Nagoya physicists resolve long-standing mystery of structure-less transition

21.08.2017 | Materials Sciences

Chronic stress induces fatal organ dysfunctions via a new neural circuit

21.08.2017 | Health and Medicine

Scientists from the MSU studied new liquid-crystalline photochrom

21.08.2017 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>