Navigation Links
Fruit juices contain more vitamin C than their labels indicate
Date:10/5/2009

A team of pharmacists from the University of Santiago de Compostela (USC) has established that the levels of vitamin C in many fruit juices and soft drinks are far higher than those indicated on their labels by the manufacturers. This finding has been possible owing to a new technique developed by the researchers to determine the content of vitamin C in these kinds of drinks.

Ascorbic acid or vitamin C is a natural antioxidant in fruits and vegetables, but the European Commission permits its use as an additive in juices, jams, dairy products and other foods. The involvement of this substance in the immune response and other biochemical processes such as the formation of collagen and the absorption of iron is well-known. However, high levels of ascorbic acid can cause diarrhoea and gastrointestinal problems, as a result of which scientists are attempting to determine the content of vitamin C in foods with greater and greater accuracy.

Now, a group of researchers from the Faculty of Pharmacy of the USC has developed a new chromatographic technique (these are used to separate and identify chemical elements) aimed at accurately measuring the ascorbic acid in fruit juices and soft drinks. By applying this method, they have found that the amounts of vitamin C stipulated on the labels of many drinks are not real. In a sample of 17 fruit juices, soft drinks and isotonic drinks, only two correspond to what is indicated on the bottle.

Ana Rodrguez Bernaldo de Quirs is a member of the team which has developed the new technique, whose details have recently been published in the Food Chemistry magazine. "The other drinks contain much higher levels than those specified by the manufacturer because, as has already been indicated in a previous study, the label probably only shows the amount of added ascorbic acid, without taking into account the fruit's natural vitamin C content", she explained to SINC.

Bernaldo de Quirs highlights the greater resolution and sensitivity of the method, by means of which it is possible to detect up to 0.01 milligrams of vitamin C per litre, "thanks to the use of new column chromatography, based on spherical particles of ultra pure silica 3 microns in size".

"Another advantage of the method is its simplicity and speed, as the total time taken to carry out the analyses is no more than six minutes", the researcher remarked.

With the new technique, the valuation of the ascorbic acid in the drinks has revealed some curious data. Of the 17 samples analyzed, the one with the highest vitamin C content was an apple juice (840 mg/l), more than the orange juices (352-739 mg/l). The results for the pineapple and grape juices were 702 mg/l and between 30.2 and 261 mg/l for the soft drinks (orange, lemon and apple).

The researchers also evaluated how the vitamin C content of the orange juices and tea drinks varies while they are on the shelves in the temperature conditions specified by the manufacturer. After six days, the former barely lose 8% of their ascorbic acid while, in the tea drinks, this substance falls by 54% at 4C and practically disappears at room temperature.


'/>"/>

Contact: SINC
info@plataformasinc.es
34-914-251-820
FECYT - Spanish Foundation for Science and Technology
Source:Eurekalert  

Related medicine news :

1. Candy and Fruit Flavored Cigarettes Now Illegal in United States; Step is First Under New Tobacco Law
2. Bon Appetit Management Companys Healthcare Plan: Eat More Local Fruits and Vegetables
3. Fruit Even Healthier Than Thought: Study
4. Watson Pharmaceuticals Receives FDA Approval for Fruit and Cinnamon Flavored Coated Nicotine Gums
5. Beverages Holdings, LLC Acquires Bossa Nova: The Superfruit Company
6. Carnegie Mellon algorithm charts evolution of genetic networks during fruit fly life cycle
7. Chemstar Corporation Introduces Safe and Effective Liquid Fruit and Vegetable Wash Composed Entirely of Food-Grade Ingredients
8. Fruits and Veggies May Improve Sperm Quality
9. Tropicana Launches Get Your Fruit On! Campaign to Help Narrow the Gap in the Nations Fruit Consumption
10. Sunsweet Introduces New Antioxidant Blend, a Delicious Blend of High Antioxidant Fruits
11. Fruit2O(R) Introduces New Essentials Line
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Fruit juices contain more vitamin C than their labels indicate
(Date:7/27/2017)... ... July 28, 2017 , ... ... upcoming episode of the award-winning television series, American Famer, scheduled to broadcast fourth ... , Syngenta is dedicated to helping humanity face its toughest challenge: how to ...
(Date:7/27/2017)... ... July 27, 2017 , ... MEDsys Software Solutions, the ... Care Organizations and Home Care Agencies, has been awarded CIO Applications Magazine’s Top ... solutions to over 1,000 agencies and multiple State Medicaid and Managed Care Programs. ...
(Date:7/27/2017)... ... July 27, 2017 , ... GAFFEY Healthcare, a leading provider ... Clinkscales to Vice President of Revenue Cycle Business Services and Suzanne Dusak to ... chief executive officer (CEO). , Elrene has been with company since Oct 2014 ...
(Date:7/27/2017)... ... 27, 2017 , ... Healthy eating isn’t always easy. Currently, more than 80 percent of Americans ... Americans overeat refined grains and sugar. This trend may help explain why the obesity rate ... are obese. , As a culture, we seem to have food on the brain more. ...
(Date:7/27/2017)... ... July 27, 2017 , ... ... compete to form startup companies around 117 breakthrough inventions from 55 institutions, including ... Institute, and National Institute of Biomedical Imaging and Bioengineering), the United States Army, ...
Breaking Medicine News(10 mins):
(Date:7/11/2017)... of Echenberg Institute, is announcing a new safe and effective at-home VuVa ... other painful pelvic pain conditions such as pelvic floor dysfunction, vulvodynia, vulvar ... ... VuVa ... company, VuVatech LLC, fills a void in the women,s wellness market because ...
(Date:7/10/2017)... , July 10, 2017  US medical equipment ... in 2021, according to Medical Equipment & ... by Freedonia Focus Reports. Continued increases in demand for ... aging of the population and supported by gains in ... equipment and supplies. New product introductions will also drive ...
(Date:7/10/2017)... S.C. , July 10, 2017  BDI ... purchasing and patient support services organization serving specialty ... today the launch of four significant, value-added member ... market insights, better manage reimbursement and improve access ... and factor therapies. ...
Breaking Medicine Technology: