Navigation Links
Roasting coffee beans a dark brown produces valued antioxidants: UBC food scientists

Food scientists at the University of British Columbia have been able to pinpoint more of the complex chemistry behind coffee's much touted antioxidant benefits, tracing valuable compounds to the roasting process.

Lead author Yazheng Liu and co-author Prof. David Kitts found that the prevailing antioxidants present in dark roasted coffee brew extracts result from the green beans being browned under high temperatures.

Their findings will appear in a forthcoming issue of Food Research International and can be previewed at:

Liu and Kitts analyzed the complex mixture of chemical compounds produced during the bean's browning process, called the "Maillard reaction." The term refers to the work by French chemist Louis-Camille Maillard who in the 1900s looked at how heat affects the carbohydrates, sugars and proteins in food, such as when grilling steaks or toasting bread.

Antioxidants aid in removing free radicals, the end products of metabolism which have been linked to the aging process.

"Previous studies suggested that antioxidants in coffee could be traced to caffeine or the chlorogenic acid found in green coffee beans, but our results clearly show that the Maillard reaction is the main source of antioxidants," says Liu, an MSc student in the Faculty of Land and Food Systems (LFS).

"We found, for example, that coffee beans lose 90 per cent of their chlorogenic acid during the roasting process," says Kitts, LFS food science professor and director of the Food, Nutrition and Health program.

The UBC study sheds light on an area of research that has yielded largely inconsistent findings. While some scientists report increased antioxidant activity in coffee made from dark roasted beans, others found a decrease. Yet other theories insist that medium roast coffees yield the highest level of antioxidant activity.

"We have yet to fully decipher all the complex compounds in roasted coffee beans. We only know the tip of the iceberg," says Kitts, who has been studying Maillard reaction chemicals over the past 25 years.


Contact: Lorraine Chan
University of British Columbia

Related biology news :

1. On organic coffee farm, complex interactions keep pests under control
2. Shade-coffee farms support native bees that maintain genetic diversity in tropical forests
3. New global coffee research initiative announced
4. UCLA researchers show how worlds smallest coffee ring may help biosensors detect disease
5. Studies provide more support for health benefits of coffee
6. Natural pest control saves coffee berry
7. Will giving coffee to babies keep them awake as adults?
8. A breath mint made from... coffee?
9. Coffee cultivation good for diversity in agrarian settlements but not in forests
10. Energy drinks: The coffee of a new generation?
11. Shade coffee benefits more than birds
Post Your Comments:
(Date:11/16/2015)... 16, 2015  Synaptics Inc. (NASDAQ: SYNA ... today announced expansion of its TDDI product portfolio ... controller and display driver integration (TDDI) solutions designed ... new TDDI products add to the previously-announced ... (WQHD resolution), and TD4322 (FHD resolution) solutions. All ...
(Date:11/10/2015)... , Nov. 10, 2015  In ... on the basis of product, type, application, ... included in this report are consumables, services, ... report are safety biomarkers, efficacy biomarkers, and ... this report are diagnostics development, drug discovery ...
(Date:11/2/2015)... 2015  SRI International has been awarded a contract ... services to the National Cancer Institute (NCI) PREVENT Cancer ... expertise, modern testing and support facilities, and analytical instrumentation ... toxicology studies to evaluate potential cancer prevention drugs. ... Cancer Drug Development Program is an NCI-supported pipeline to ...
Breaking Biology News(10 mins):
(Date:11/25/2015)... November 26, 2015 ... Market 2016 - 2020 report analyzes that automating ... and quality in long-term samples, minimizing manual errors, ... Automation minimizes manual errors such as mislabeling or ... Further, it plays a vital role in blood ...
(Date:11/25/2015)... 2 nouvelles études permettent d ... différences entre les souches bactériennes retrouvées dans la plaque ... humains . Ces recherches  ouvrent une nouvelle ... charge efficace de l,un des problèmes de santé ... .    --> 2 nouvelles études permettent d ...
(Date:11/25/2015)... ANGELES and HOLLISTON, Mass. ... Technology, Inc. (Nasdaq: HART ), a biotechnology company ... that CEO Jim McGorry will present at ... December 1, 2015 at 2:30 p.m. PT. The presentation ... below) for 30 days. Management will also be available ...
(Date:11/25/2015)... 2015 /PRNewswire/ - Aeterna Zentaris Inc. (NASDAQ:  AEZS; TSX: ... prospects remain fundamentally strong and highlights the following ... received DSMB recommendation to continue the ZoptEC Phase ... the final interim efficacy and safety data ... men with heavily pretreated castration- and Taxane-resistant prostate ...
Breaking Biology Technology: