Featured Research

from universities, journals, and other organizations

Fermentation of cocoa beans requires precise collaboration among two bacteria, and yeast

Date:
June 10, 2014
Source:
American Society for Microbiology
Summary:
Good chocolate is among the world's most beloved foods, which is why scientists are seeking to improve the product, and enhance the world's pleasure. A team of researchers has embarked upon a quest to better understand natural cocoa fermentation.

Good chocolate is among the world's most beloved foods, which is why scientists are seeking to improve the product, and enhance the world's pleasure. A team of researchers from Germany and Switzerland -- the heartland of fine chocolate -- have embarked upon a quest to better understand natural cocoa fermentation and have published findings ahead of print in the journal Applied and Environmental Microbiology.

"Our studies have unraveled the metabolism of the rather unexplored acetic acid bacteria in the complex fermentation environment," says corresponding author Christoph Wittmann of Saarland University, Saarbruecken, Germany

In the study, Wittmann and his collaborators from the Nestle Research Centre, Lausanne, Switzerland, simulated cocoa pulp fermentation in the laboratory. They mapped metabolic pathway fluxes of the acetic acid bacteria, feeding them specific isotopes that could easily be tracked. Wittmann compares the process to viewing the flows of city traffic from the sky. "We could see what they eat and how they use the nutrients to fuel the different parts of their metabolism in order to grow and produce extracellular products," he says.

The key molecule to initiate flavor development is acetate, says Wittmann, noting that "The intensity of the aroma from a fermented bean is amazing."

Production of acetate requires two major nutrients: lactate and ethanol. These are produced by lactic acid bacteria, and yeast, respectively, during the initial fermentation of cocoa pulp sugars, says Wittmann.

The acetic acid bacteria then process these simultaneously, via separate metabolic pathways, ultimately producing acetate from them.

"This discovery reveals a fine-tuned collaboration of a multi-species consortium during cocoa fermentation," says Wittman. And that may help improve selection of natural strains for better-balanced starter cultures.


Story Source:

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


Journal Reference:

  1. P. Adler, L. J. Frey, A. Berger, C. J. Bolten, C. E. Hansen, C. Wittmann. The key to acetate: Metabolic fluxes of acetic acid bacteria under cocoa pulp fermentation simulating conditions. Applied and Environmental Microbiology, 2014; DOI: 10.1128/AEM.01048-14

Cite This Page:

American Society for Microbiology. "Fermentation of cocoa beans requires precise collaboration among two bacteria, and yeast." ScienceDaily. ScienceDaily, 10 June 2014. <www.sciencedaily.com/releases/2014/06/140610205526.htm>.
American Society for Microbiology. (2014, June 10). Fermentation of cocoa beans requires precise collaboration among two bacteria, and yeast. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2014/06/140610205526.htm
American Society for Microbiology. "Fermentation of cocoa beans requires precise collaboration among two bacteria, and yeast." ScienceDaily. www.sciencedaily.com/releases/2014/06/140610205526.htm (accessed July 31, 2014).

Share This




More Plants & Animals News

Thursday, July 31, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Thousands Flocking to German Crop Circle

Raw: Thousands Flocking to German Crop Circle

AP (July 30, 2014) Thousands of people are trekking to a Bavarian farmer's field to check out a mysterious set of crop circles. (July 30) Video provided by AP
Powered by NewsLook.com
Concern Grows Over Worsening Ebola Crisis

Concern Grows Over Worsening Ebola Crisis

AFP (July 30, 2014) Pan-African airline ASKY has suspended all flights to and from the capitals of Liberia and Sierra Leone amid the worsening Ebola health crisis, which has so far caused 672 deaths in Guinea, Liberia and Sierra Leone. Duration: 00:43 Video provided by AFP
Powered by NewsLook.com
At Least 20 Chikungunya Cases in New Jersey

At Least 20 Chikungunya Cases in New Jersey

AP (July 30, 2014) At least 20 New Jersey residents have tested positive for chikungunya, a mosquito-borne virus that has spread through the Caribbean. (July 30) Video provided by AP
Powered by NewsLook.com
Xtreme Eating: Your Daily Caloric Intake All On One Plate

Xtreme Eating: Your Daily Caloric Intake All On One Plate

Newsy (July 30, 2014) The Center for Science in the Public Interest released its 2014 list of single meals with whopping calorie counts. 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