Featured Research

from universities, journals, and other organizations

'Fingerprint' For Fruit Juices Shows When Cheap Juices Are Substituted

Date:
January 9, 2008
Source:
Basque Research
Summary:
Adulterations or other possible food frauds are a financial problem that affects many foodstuffs. This is why achieving the authentification of food products is of great importance. In the case of fruit juices the most common type of adulteration is mixing the original juice with juices from other, cheaper fruits (mainly grapefruit, grape or pear); in other words falsifying the juice.

Adulterations or other possible food frauds are a financial problem that affects many foodstuffs. This is why achieving the authentification of food products is of great importance. In the case of fruit juices the most common type of adulteration is mixing the original juice with juices from other, cheaper fruits (mainly grapefruit, grape or pear); in other words falsifying the juice.

Related Articles


Amongst the chemical methods of authentification, there are two different strategies. On the one hand, the employment of markers – chemical compounds that are ideally specific for or exclusive to each fruit and that can be rapidly, safely and cheaply measured and analysed. This would be ideal. On many occasions, however, it is not possible to find markers that fulfil these requirements and, so, another approach to authentification methods is to measure and analyse a greater number of chemical compounds that make up the characteristic profile of each fruit or fruit juice. The complexity of this requires the employment of chemical analysis techniques and highly sophisticated statistical tools.

Polyphenolic compounds

In order to confirm the authenticity of the fruit juices, researchers at the Department of Analytical Chemistry of the University of the Basque Country (EHU-UPV) are trying to identify their fingerprints, as it were, using a family of chemical compounds naturally present in all fruit and known as polyphenols. There are thousands of polyphenols amongst the various species in the vegetable kingdom, with differences both in the number of particular polyphenols present in each vegetable species as well as in the quantities found. Thus, different fruits have specific polyphenolic differences.

In order to analyse polyphenols present in each for each fruit, researchers at the EHU-UPV used a high-performance liquid chromatography technique (HPLC), through which they culled information about what particular polyphenols are present in each fruit and in what quantity. This enables the study of the differences in the polyphenols between one fruit and another.

In any case, to be more certain of these polyphenols profiles, the confirmation is needed of the identity of each one of the polyphenols appearing in these profiles. To this end, a mass spectroscopy (MS) analytical technique was employed.

Orange, mandarin, lemon ...

A total of 16 fruits (Orange, mandarin, lemon, grapefruit, etc.), grown in Spain, were studied. In each case a study of the various varieties of each fruit was undertaken – up to 77 varieties, in order to know the common points of all fruits, and their differences.

Beatriz Abad has found, amongst other things in her PhD, a quite exclusive marker for lemon and three for grapefruit. She has also shown that using several markers instead of one increases the probability in detecting the food fraud. Moreover, she observed key differences in various “prints” and, using certain statistical tools, showed that such differences provide a quite reliable degree of accuracy in the detection of some mixtures of juices. For example, detecting the presence of grapefruit in orange juice is very sure and relatively easy; detecting the presence of lemon juice in orange juice is also quite accurate; but detecting the presence of mandarin oranges in orange juice is much more difficult and not very reliable, given that the mandarin and the orange are very similar in their “prints”.

To date they have defined the polyphenolic profiles or polyphenolic “fingerprints” of the various juices from genuine fruit. The next step is currently being carried out by researchers at the EHU-UPV – applying these “prints to existing commercial juices on the market in order to detect possible adulterations or frauds.


Story Source:

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


Cite This Page:

Basque Research. "'Fingerprint' For Fruit Juices Shows When Cheap Juices Are Substituted." ScienceDaily. ScienceDaily, 9 January 2008. <www.sciencedaily.com/releases/2008/01/080107101009.htm>.
Basque Research. (2008, January 9). 'Fingerprint' For Fruit Juices Shows When Cheap Juices Are Substituted. ScienceDaily. Retrieved October 31, 2014 from www.sciencedaily.com/releases/2008/01/080107101009.htm
Basque Research. "'Fingerprint' For Fruit Juices Shows When Cheap Juices Are Substituted." ScienceDaily. www.sciencedaily.com/releases/2008/01/080107101009.htm (accessed October 31, 2014).

Share This



More Plants & Animals News

Friday, October 31, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Watch Baby Goose Survive A 400-Foot Cliff Dive

Watch Baby Goose Survive A 400-Foot Cliff Dive

Buzz60 (Oct. 31, 2014) For its nature series Life Story, the BBC profiled the barnacle goose, whose chicks must make a daredevil 400-foot cliff dive from their nests to find food. Jen Markham has the astonishing video. Video provided by Buzz60
Powered by NewsLook.com
World's Salamanders At Risk From Flesh-Eating Fungus

World's Salamanders At Risk From Flesh-Eating Fungus

Newsy (Oct. 31, 2014) The import of salamanders around the globe is thought to be contributing to the spread of a deadly fungus. Video provided by Newsy
Powered by NewsLook.com
Alcoholic Drinks In The E.U. Could Get Calorie Labels

Alcoholic Drinks In The E.U. Could Get Calorie Labels

Newsy (Oct. 31, 2014) A health group in the United Kingdom has called for mandatory calorie labels on alcoholic beverages in the European Union. Video provided by Newsy
Powered by NewsLook.com
Malaria Threat in Liberia as Fight Against Ebola Rages

Malaria Threat in Liberia as Fight Against Ebola Rages

AFP (Oct. 31, 2014) Focus on treating the Ebola epidemic in Liberia means that treatment for malaria, itself a killer, is hard to come by. MSF are now undertaking the mass distribution of antimalarials in Monrovia. Duration: 00:38 Video provided by AFP
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:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

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