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Utilizing Non-Saccharomyces Yeast As Bio-Protectants During Pre-Fermentation Cold Soaking Under Different Conditions

Creator:: Nichols, Melanie L.
Abstract:: Cold soaking is a technique used during red winemaking to alter the aroma, flavor, and phenolic content of a wine. However, cold soaking does not come without risk, as this process can result in the production of spoilage compounds such as acetic acid and ethyl acetate if excessive growth of...
Resource Type:: Masters Thesis
Full Text:: -2a during a six-day cold soak in model grape juice (MGJ) at 8⁰C. Only M. fructicola Gaïa

Use of Organoleptic Methodologies to Evaluate Wine Oligosaccharides and Wines made from Grapevine Red Blotch Virus Positive Vines Subjected to Various Vineyard Management Practices

Creator:: Hoffman, Samuel
Abstract:: The human senses can be used as analytical tools to evaluate many different aspects of our daily lives. The use of our senses through organoleptic methods offers unique and powerful insights into the characteristics of different stimuli. Due to the unique function of the different sensory organs we use to...
Resource Type:: Masters Thesis
Full Text:: . Michael Penner, and Dr. Jean Hall. Their questions and feedback have forced me to expand upon my way

The Impact of Malolactic Fermentation Conducted by Oenococcus oeni on Brettanomyces bruxellensis Growth and Volatile Phenol Production

Creator:: Lauderdale, Adam D.
Abstract:: Wine is particularly vulnerable to infection by Brettanomyces bruxellensis during or shortly after malolactic fermentation (MLF). While different methods and techniques enable winemakers to prevent wine spoilage due to this organism, no single intervention is universally sufficient. Moreover application of sulfur dioxide, the most commonly used of these methods, is...
Resource Type:: Masters Thesis
Full Text:: wanted out of my time at OSU, to Drs. Michael Penner and Chris Curtin whose ears have been graciously

Influence of Biotic and Abiotic Factors on Yeast Communities during Cold Soak and the Consequences for Wine Aroma

Creator:: Johnson, Jared D.
Abstract:: Pre-fermentation cold soak is a winemaking technique used to alter the color, mouthfeel, and aroma of red wine. While it is still debated what impact cold soak has on these wine quality parameters, current thoughts are that resident yeast populations found in fresh grape must play a role in altering...
Resource Type:: Masters Thesis
Full Text:: , cold soaks were conducted for 6 days at two temperatures (6˚C or 10˚C) and three SO2 concentrations

Interactions between Oenococcus oeni and Brettanomyces bruxellensis during winemaking and consequences for wine quality

Creator:: DuBois, Aubrey E.
Abstract:: The growth of Brettanomyces bruxellensis is a major cause of wine spoilage due tothe production of the volatile phenols 4-ethylphenol (4-EP) and 4-ethylguaiacol (4-EG), derivatives of p-coumaric acid and ferulic acid. During the winemaking process,some microorganisms can impact the concentration of the 4-EP precursors pcoumaricand coutaric acid (tartaric acid-esterified p-coumaric...
Resource Type:: Masters Thesis
Full Text:: stored at either 13 or 21C. During 180 days of aging, the concentration of p-coumaric acid and

Impact of lees content, nitrogen, and elemental sulfur on volatile sulfur compound formation in Vitis vinifera L. cv. 'Pinot noir' wine

Creator:: Kraft, Daniel N.
Abstract:: One of the most common problems in wine production is the formation of hydrogen sulfide (H₂S) and other volatile sulfur compounds (VSCs), which can mask positive aromas at low concentrations and result in unpleasant aromas such as rotten egg, cabbage, garlic, and rubber at higher concentrations. Despite the large body...
Resource Type:: Masters Thesis
Full Text:: at 27°C and H2S production was again measured using lead acetate tubes. Wines were assessed for

Effects of Pediococcus spp. on Oregon Pinot noir

Creator:: Strickland, Matthew T.
Abstract:: This research investigated the effects of Pediococcus spp. on Oregon Pinot noir wines. Pediococcus (P. parvulus (7), P. damnosus (1), P. inopinatus (1)) isolated from Oregon and Washington state wines demonstrated differences in their susceptibility to SO₂ with some isolates growing well in model media at 0.4 mg/L molecular SO₂....
Resource Type:: Masters Thesis
Full Text:: unwavering and invaluable. CONTRIBUTION OF AUTHORS Dr. Michael Qian and Qin Zhou of OSU

Impact of yeast present during pre-fermentation cold maceration on Pinot noir wine aroma

Creator:: Hall, Harper L.
Abstract:: This research investigated yeast populations and diversity during pre-fermentation cold maceration and alcoholic fermentation of Vitis vinifera L. cv. Pinot noir grapes from a commercial vineyard (Dayton, OR). Fermentations were conducted at the Oregon State University research winery in 100 L tanks while grapes from the same vineyard lot were...
Resource Type:: Masters Thesis
Full Text:: . Samples were taken daily during pre-fermentation maceration (9°C) and alcoholic fermentation (27°C) and

Impact of malolactic fermentation on red wine color and color stability

Creator:: Burns, Tresider R.
Abstract:: Malolactic fermentation (MLF) is an important step in the production of wines and is commonly performed in red or cool climate wines to reduce acidity. In this study the impact of MLF on red wine color and the ability of Oenococcus oeni to degrade compounds important to the development of...
Resource Type:: Masters Thesis
Full Text:: as MLF (+) wines. All wines were sterile-filtered, bottled, and stored at 13°C for analyses. MLF

Production of SO₂ and SO₂ binding compounds by Saccharomyces cerevisiae during the alcoholic fermentation and the impact on wine lactic acid bacteria

Creator:: O'Neil, Allison L.
Abstract:: Malolactic fermentation (MLF) is important in the production of wines as it reduces acidity through the conversion of malic acid to lactic acid. However, successful MLF can be difficult to achieve due to yeast antagonism of the bacterium responsible for the secondary fermentation, Oenococcus oeni. In particular, yeast produced sulfur...
Resource Type:: Masters Thesis
Full Text:: last few years. I would like to acknowledge Dr. Mark A. Daeschel, Dr. Michael C. Qian, and Dr

ScholarsArchive@OSU

Utilizing Non-Saccharomyces Yeast As Bio-Protectants During Pre-Fermentation Cold Soaking Under Different Conditions

Use of Organoleptic Methodologies to Evaluate Wine Oligosaccharides and Wines made from Grapevine Red Blotch Virus Positive Vines Subjected to Various Vineyard Management Practices

The Impact of Malolactic Fermentation Conducted by Oenococcus oeni on Brettanomyces bruxellensis Growth and Volatile Phenol Production

Influence of Biotic and Abiotic Factors on Yeast Communities during Cold Soak and the Consequences for Wine Aroma

Interactions between Oenococcus oeni and Brettanomyces bruxellensis during winemaking and consequences for wine quality

Impact of lees content, nitrogen, and elemental sulfur on volatile sulfur compound formation in Vitis vinifera L. cv. 'Pinot noir' wine

Effects of Pediococcus spp. on Oregon Pinot noir

Impact of yeast present during pre-fermentation cold maceration on Pinot noir wine aroma

Impact of malolactic fermentation on red wine color and color stability

Production of SO₂ and SO₂ binding compounds by Saccharomyces cerevisiae during the alcoholic fermentation and the impact on wine lactic acid bacteria

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