Navigation Links
Explaining Stevia's bitter side
Date:5/31/2012

The human tongue has just one receptor type for detecting sweetness but about25 different ones for bitter flavors. Scientists at Technische Universitaet Muenchen (TUM) and the German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE) have now identified the two receptors, hTAS2R4 and hTAS2R14, that detect the bitter after taste of Stevia.

Extracts from the subtropical plants are up to 300 times sweeter than conventional sugar. They also contain almost no calories and are less harmful to teeth. Yet Stevia, or sweet leaf, as it is more commonly known, also has its disadvantages: At high concentrations, it elicits licorice-like aromas and a bitter after taste.

The scientists investigated nine Steviol glycosides responsible for the intensive sweet taste of Stevia plant extracts. They initially tested the bitterness or sweetness that each glycoside evokes in vitro, using cells that act as taste receptor cells and react to the glycoside molecules like an artificial tongue. The researchers were thus able to identify the receptors that are activated by Stevia.

They also tested the taste intensity of different concentrations of Stevia components with trained volunteers. The results of those sensory tests combined with the initial cell experiments revealed that the structure of glycoside molecules plays a key role in determining sweetness or bitterness in Stevia. "If a molecule has more glucose molecules attached to it, it is sweeter and less bitter," explains Prof. Thomas Hofmann, Chair of Food Chemistry and Molecular Sensory Science at TUM. The Steviol glycoside rebaudioside D, for example, comprises five glucose molecules and is around five times sweeter and two-thirds less bitter than dulcoside A, which has just two glucose molecules.

"Steviol glycosides activate two bitter receptors on the human tongue, and this elicits a bitter after taste in the mouth," confirms Anne Brockhoff at the German Institute of Human Nutrition. These new findings could help minimize the bitter taste of Stevia products at an early stage in production processes. "They could open the way for selective cultivation measures or targeted purification during the development of Stevia products, enabling manufacturers to focus on the sweetest candidates," confirms TUM scientist Thomas Hofmann.


'/>"/>

Contact: Undine Ziller
ziller@zv.tum.de
49-816-171-5403
Technische Universitaet Muenchen
Source:Eurekalert

Related medicine news :

1. Brochures explaining new health care law to patients available free in English and Spanish
2. Bitter sensitive children eat more vegetables with help of dip
3. Bitter Taste Receptors Found in Lungs May Aid Asthma Patients
4. Bitrex Bitter Safety Additive Exhibiting at the Safe Kids Fair 2010; Making a Bitter Face to Learn about Poisoning Prevention
5. Bitter Melon Extract May Slow, Stop Breast Cancer
6. Bitter melon extract decreased breast cancer cell growth
7. Bitter melon extract attacks breast cancer cells
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/5/2016)... ... 05, 2016 , ... Pivot Point Consulting achieved ... KLAS Performance Report, Epic Consulting 2016 - Which Firms Provide Breadth, ... consulting services for electronic health record (EHR) solutions from Epic Systems Corporation ...
(Date:5/5/2016)... , ... May 05, 2016 , ... Textile Exchange ... Wool Standard (RWS) for public stakeholder review. The stakeholder review is an important opportunity ... meets its goals and delivers value to the wool industry., The RWS is intended ...
(Date:5/5/2016)... CA (PRWEB) , ... May 05, 2016 , ... ... and dedicated Twitter feed to cover the latest news and commentary at the 2016 ... 10th. This meeting of the American Society of Cataract and Refractive Surgery and the ...
(Date:5/5/2016)... ... May 05, 2016 , ... TLC Laser Eye Centers ... California. The laser eye center will now be called “Gordon Schanzlin New Vision Institute, ... will remain at the full-service facility to ensure that patients continue to receive the ...
(Date:5/5/2016)... ... May 05, 2016 , ... ... promise successful results with IVF and with egg freezing, today announced the grand ... patient-centric and highest quality fertility care, Spring Fertility offers both fertility preservation (egg, ...
Breaking Medicine News(10 mins):
(Date:5/4/2016)... 2016 According to market research "Global ... Forecast to 2022 - Industry Insights by Slice Type (High, ... Others)" by P&S Market Research, the global computed tomography ... it is expected to grow at a CAGR of 5.0% ... segment is expected to witness the faster growth, CAGR of ...
(Date:5/4/2016)... DUBLIN , May 4, 2016 /PRNewswire/ ... the addition of the  "Global Acute Ischemic ... 2016"  report to their offering.  ... Global Acute Ischemic Stroke Market ... insights into Acute Ischemic Stroke pipeline products, ...
(Date:5/3/2016)... May 3, 2016 BioNovus Innovations LLC ... for Advancing Medical Innovation (IAMI) today announced a ... diagnostics and medical devices. An agreement ... rights to license, develop and commercialize medical innovations ... "This partnership represents a significant advance in ...
Breaking Medicine Technology: