Featured Research

from universities, journals, and other organizations

Metals Involved In The Colour Of Wine

Date:
November 14, 2005
Source:
Elhuyar Fundazioa
Summary:
A University of Navarre research team has 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.

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.


Story Source:

The above story is based on materials provided by Elhuyar Fundazioa. Note: Materials may be edited for content and length.


Cite This Page:

Elhuyar Fundazioa. "Metals Involved In The Colour Of Wine." ScienceDaily. ScienceDaily, 14 November 2005. <www.sciencedaily.com/releases/2005/11/051114110234.htm>.
Elhuyar Fundazioa. (2005, November 14). Metals Involved In The Colour Of Wine. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2005/11/051114110234.htm
Elhuyar Fundazioa. "Metals Involved In The Colour Of Wine." ScienceDaily. www.sciencedaily.com/releases/2005/11/051114110234.htm (accessed July 25, 2014).

Share This




More Plants & Animals News

Friday, July 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Boy Attacked by Shark in Florida

Boy Attacked by Shark in Florida

Reuters - US Online Video (July 24, 2014) — An 8-year-old boy is bitten in the leg by a shark while vacationing at a Florida beach. Linda So reports. Video provided by Reuters
Powered by NewsLook.com
Goma Cheese Brings Whiff of New Hope to DRC

Goma Cheese Brings Whiff of New Hope to DRC

Reuters - Business Video Online (July 24, 2014) — The eastern region of the Democratic Republic of Congo, mainly known for conflict and instability, is an unlikely place for the production of fine cheese. But a farm in the village of Masisi, in North Kivu is slowly transforming perceptions of the area. Known simply as Goma cheese, the Congolese version of Dutch gouda has gained popularity through out the region. Ciara Sutton reports. Video provided by Reuters
Powered by NewsLook.com
Dogs Appear To Become Jealous Of Owners' Attention

Dogs Appear To Become Jealous Of Owners' Attention

Newsy (July 23, 2014) — A U.C. San Diego researcher says jealousy isn't just a human trait, and dogs aren't the best at sharing the attention of humans with other dogs. Video provided by Newsy
Powered by NewsLook.com
Professor Creates Site Revealing Where People's Cats Live

Professor Creates Site Revealing Where People's Cats Live

Newsy (July 23, 2014) — ​It's called I Know Where Your Cat Lives, and you can keep hitting the "Random Cat" button to find more real cats all over the world. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

    Health News

      Environment News

        Technology News



          Save/Print:
          Share:  

          Free Subscriptions


          Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

          Get Social & Mobile


          Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

          Have Feedback?


          Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
          Mobile iPhone Android Web
          Follow Facebook Twitter Google+
          Subscribe RSS Feeds Email Newsletters
          Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins