Influence of pH and ethanol on malolactic fermentation and volatile aroma compound composition in white wines

Date
2011
Authors
Knoll C.
Fritsch S.
Schnell S.
Grossmann M.
Rauhut D.
Du Toit M.
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
The present study investigated the influences of pH and ethanol on malolactic fermentation (MLF) and the volatile aroma profile of the subsequent white wines from Riesling and Chardonnay inoculated with two different Oenococcus oeni strains. In all cases MLF was induced after completion of alcoholic fermentation (AF). Partial MLF occurred under low pH 3.2 and high alcohol (118.3 g/L) conditions. In the cases with complete MLF, the time required for each strain varied from 13 to 61 days and was dependent on bacterial culture, cultivar and wine parameter. Chemical properties of each wine were determined after AF, complete and partial MLF. The wines showed significant differences in total higher alcohols, esters and acids that are important for the sensory profile and quality of wine. This work demonstrated that the wine matrix as well as the pH and alcohol concentration affects MLF and the final volatile aroma profile. Results indicate that changes in volatile aroma composition are not necessarily related to complete MLF and that partial MLF already has distinct influences on the wine aroma profile of white wines. © 2011 Elsevier Ltd.
Description
Keywords
Malolactic fermentation, Oenococcus oeni, Stress, Volatile aroma compounds, Alcohol concentrations, Alcoholic fermentation, Bacterial cultures, Higher alcohols, Influence of pH, Malolactic fermentation, Oenococcus oeni, Sensory profiles, Volatile aroma compounds, White wines, Wine aromas, Wine matrix, Bacilli, Chemical properties, Ethanol, Fermentation, Wine, Magnetic leakage, Bacteria (microorganisms), Oenococcus oeni
Citation
LWT - Food Science and Technology
44
10
http://www.scopus.com/inward/record.url?eid=2-s2.0-80051781866&partnerID=40&md5=23a50c92ab81c8c67dceab3b96db2902
URI
http://hdl.handle.net/10019.1/16913
Collections
Stellenbosch University - Scopus Publications