Navigation Links
Special yeast reduce alcohol, improve wine
Date:1/16/2014

A team of Australian researchers has taken a giant step towards controlling a growing problem in the wine community. They have identified special yeast that produce a lower level of alcohol, helping to preserve the flavor. Their research is published ahead of print in the journal Applied and Environmental Microbiology.

The alcoholic content of wine has crept gradually northward in the last 10-15 years, from 12-12.5 percent to beyond 15 percent. What might sound trivial to aficionados of hard liquor is seen by some oenophiles as a disturbing trend, threatening the flavor and character of some wines. That, plus issues of public health, as well as taxes (in some countries, on alcoholic content), have created a need for approaches to lowering alcohol content.

The investigation began with a systematic screening of non-Saccharomyces yeast as a means of achieving such a reduction, says corresponding author Cristian Varela of the Australian Wine Research Institute, Adelaide, South Australia. The investigators evaluated 50 different isolates from 40 species and 24 genera for their capacity to produced wine with reduced ethanol concentration. They chose the most successful of these yeasts, Metschnikowia pulcherrima AWRI1149, for experiments in which it was set to work separately on Chardonnay and Shiraz musts.

Once the slower-growing Metschnikowia yeasts had consumed 50 percent of the sugar, S. cerevisiae were added to the mix to complete the process. This "sequential inoculation" reduced the alcohol content in Shiraz from 15 percent to 13.4 percent (and somewhat less in Chardonnay). Controls not inoculated with non-Saccharomyces strains did not produce reduced alcohol content, according to the report.

"The reduction isn't all that great, but it's in the right direction, and with more work, they might get that even lower, perhaps by letting the non-Saccharomyces yeast go longer before you throw in the Saccharomyces, says Alan Bakalinsky, of Oregon State University, Corvallis, who was not involved in the research.

This reduction in alcohol will be of great benefit to the industry says Louisa Rose, of Yalumba and Hill-Smith Family Vinyards, Angaston, South Australia, who is also a director of the Australian Wine Research Institute. "It is using techniquessequential fermentationthat can easily be used in the winery on a commercial scale."

Previous studies investigating the effects of non-Saccharomyces yeasts on alcoholic fermentation have focused on few species and been concerned principally with the formation of the flavor compounds that might impact negatively on wine quality. None of these led to reductions in alcohol content as substantial as those he reported, says Varela.

The rise in alcohol content in wine has resulted from later harvesting of red grapes. This allows the tanninsresponsible for astringency and bitternessto soften, and in some varieties, it helps minimize the presence of off-flavors, like methoxypyrazines (green pepper/asparagus sensory notes.) But on the downside, the boost in alcohol content reduces aroma and flavor intensity, as well as otherwise impairing the oenological experience. Reducing the alcohol would enable the best of both worlds.

It would also reduce consumer costs in countries where alcohol consumption is taxed, and accede to national and international public health recommendations to lower the alcohol content of alcoholic beverages, such as wine.


'/>"/>

Contact: Jim Sliwa
jsliwa@asmusa.org
202-942-9297
American Society for Microbiology
Source:Eurekalert

Related biology news :

1. Scientists find a groovy way to influence specialization of stem cells
2. Special issue of Gut Microbes on Helicobacter pylori
3. Walgreens Mike Ellis Named First President of National Association of Specialty Pharmacy (NASP)
4. Genetics in Medicine publishes special issue dedicated to genomics in electronic health records
5. Journal of Spinal Cord Medicine publishes special issue on assistive technology
6. RNA-interference pesticides will need special safety testing
7. CARE Pharmacies Joins National Association of Specialty Pharmacy (NASP) as a Founding Corporate Member
8. AegisCare Offers Specialized Home Health Care for Dementia and Alzheimers Patients
9. NASP and ASCP Discuss Future of Specialty Pharmacy in Aging Market at Upcoming ASCP Conference
10. More food and greener farming with specialised transporters for plants
11. Geosphere adds 2 new special issue themes
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:11/28/2016)... LONDON , Nov. 28, 2016 ... at a rate of 16.79%" The biometric system ... to grow further in the near future. The biometric ... 32.73 billion in 2022, at a CAGR of 16.79% ... biometrics system, integration of biometric technology in smartphones, rising ...
(Date:11/22/2016)... According to the new market research report "Biometric System Market by Authentication ... (Hardware and Software), Function (Contact and Non-contact), Application, and Region - Global ... from USD 10.74 Billion in 2015 to reach USD 32.73 Billion by ... Continue Reading ... ...
(Date:11/21/2016)... 21, 2016   Neurotechnology , a provider ... today announced that the MegaMatcher On Card fingerprint ... for the NIST Minutiae Interoperability Exchange (MINEX) ... mandatory steps of the evaluation protocol. ... test of fingerprint templates used to establish compliance ...
Breaking Biology News(10 mins):
(Date:12/8/2016)... , ... December 08, 2016 , ... ... the business of innovation is taking over sports. On Thursday, December 15th a ... how technology is disrupting the playing field at a Smart Talk session. Smart ...
(Date:12/8/2016)... SAN DIEGO , Dec. 8, 2016 /PRNewswire-USNewswire/ ... treatments for congestive heart failure and type 2 ... license for a novel adeno-associated virus (AAV) vector ... Kay , M.D., Ph.D., at Stanford University. The ... of its paracrine gene therapy product pipeline. ...
(Date:12/8/2016)... ... December 08, 2016 , ... ... that provide essential device-to-computer interconnect using USB or PCI Express, announced the FOMD-ACV-A4, ... The FOMD-ACV-A4 is a small, thin, SODIMM-style module that fits a standard 204-pin ...
(Date:12/8/2016)...  Anaconda BioMed S.L., a pre-clinical stage medical device ... neuro-thrombectomy system for the treatment of Acute Ischemic Stroke ... to join its Scientific Advisory Board (SAB). The SAB ... scientific and clinical experts to Anaconda BioMed S.L., as ... ® to its clinical phase. The SAB is ...
Breaking Biology Technology: