scholarly journals SPECIFIC FEATURES OF FERMENTATION OF THE MUST FROM WHITE GRAPE VARIETIES IN THE CONDITIONS OF THE ODESSA REGION

2019 ◽  
Vol 13 (4) ◽  
Author(s):  
O. Kananykhina ◽  
O. Tkachenko ◽  
T. Suhachenko ◽  
O. Titlova
Keyword(s):  
Physicochemical Parameters ◽  
Fermentation Process ◽  
Yeast Saccharomyces Cerevisiae ◽  
Grape Must ◽  
Main Requirement ◽  
Yeast Cultures ◽  
Organoleptic Characteristics ◽  
Supplementary Nutrition ◽  
Grape Varieties ◽  
Grape Must Fermentation

One of the most important problems of the modern wine technology is the production of high quality and competitive products. It is commonly known that the quality of a wine largely depends on the yeast race. The main requirement for yeast is completeness of fermentation, which depends on the amount  of yeast involved, aeration, initial content of various substances in the must, temperature, pH of the environment. Using  imported  materials in the specific conditions of national winemaking requires laboratory and industrial research to rationalize the use of local and foreign pure yeast cultures and to accelerate the process of grape must fermentation. So, this study considers how  the  yeast  origin and additional nutrition effect on grape must fermentation and influence the physicochemical and organoleptic characteristics of wine materials obtained from the white grape varieties  Aromatny and Zagrei of the generative breeding by the National Scientific Centre Tairov Viticulture and Winemaking Institute. Besides, it has been concluded whether using additional nutrition  is  practical.  It has been established that the fermentation process was complete in both the control and the experimental samples. There were no facts of underfermentation. When supplementary nitrogenous nutrition was used, the fermentation activity of yeast increased and the fermentation process ended faster. The dynamics of the  total  number of cells of the Aromatic and Zagrei varieties was the same during the years 2015–2017 and did not depend on the fermentation scheme. It has been found that the fermentation process does not depend on supplementary nutrition, but the yeast race effects on the physicochemical parameters, namely on the volatile acids content. The results obtained have shown the effect of a yeast race and supplementary nutrition on the organoleptic characteristics of these varieties. In Southern Ukraine, to control the quality characteristics of wine materials, using active dry yeast Saccharomyces cerevisiae with a two-stage nutrition complex has a positive effect on the physicochemical parameters of the corresponding grape variety and allows revealing its varietal characteristics.

scholarly journals Determination of the oenological properties of yeast strains isolated from spontaneously fermented grape musts obtained from cool climate grape varieties

2020 ◽  
Vol 246 (11) ◽  
pp. 2299-2307
Author(s):  
Monika Cioch-Skoneczny ◽  
Paweł Satora ◽  
Szymon Skoneczny ◽  
Aneta Pater
Keyword(s):  
Organic Acids ◽  
Wine Production ◽  
Amine Nitrogen ◽  
Alcohol Extract ◽  
Grape Must ◽  
Yeast Cultures ◽  
Yeast Strains ◽  
Organoleptic Characteristics ◽  
Grape Musts ◽  
Cool Climate

Abstract The international competitiveness of the wine sector and consumer demands for the unique wine styles pose challenges in improving the fermentation process. The basis of proper alcoholic fermentation is knowledge about how individual yeast strains interact with the aroma, taste and color of wine, what results in possibility to select species used as starter cultures. To use the value of non-Saccharomyces yeast strains in wine production and to minimize the possibility of wine deterioration, it is necessary to precisely recognize the yeast cultures present on the fruit of the vine and in grape must, as well as their metabolic properties. The aim of the study was to determine the oenological properties of yeasts isolated from spontaneously fermented grape musts obtained from cool climate grapes. For this purpose, Zweigelt grape must was fermented with yeast monocultures. Alcohol, extract, sugars, glycerol, total acidity and free amine nitrogen were analyzed in the obtained wines. Poor fermentation properties of yeast strains results in obtaining wines with relatively large amounts of residual sugars and low alcohol. A decrease in overall acidity was noted in sets with the participation of M. pulcherrima MG971264, while in other tests the opposite trend was observed. Although some microorganisms have the ability to assimilate organic acids found in wine, they are not able to carry out fermentation or they do it inefficiently. Solution to this problem may, therefore, be use of mixed cultures of noble and non-Saccharomyces yeast, what effectively reduce the concentration of organic acids, while not adversely affecting the organoleptic characteristics of the drink.

DEPENDENCE OF THE CONCENTRATION OF AROMATIC COMPONENTS AND ORGANIC ACIDS IN WHITE TABLE WINE MATERIAL ON THE METHOD OF TECHNOLOGICAL PROCESSING

2019 ◽  
Author(s):  
А.А. АЛЕКСЕЕВА ◽  
Н.М. АГЕЕВА ◽  
В.Е. СТРУКОВА ◽  
Ю.Ф. ЯКУБА ◽  
Л.И. СТРИБИЖЕВА
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Organic Acids ◽  
Methyl Acetate ◽  
Soft Mode ◽  
Higher Alcohols ◽  
Yeast Saccharomyces Cerevisiae ◽  
Grape Must ◽  
Aromatic Components ◽  
Technological Processing ◽  
Active Dry Yeast

Рассмотрено влияние способа технологической обработки белого столового виноматериала на состав и концентрацию компонентов ароматобразующего комплекса и органических кислот. В качестве объекта исследований был белый столовый виноматериал Пино Блан урожая 2018 г. Виноматериал получен по следующей схеме: переработка винограда в мягком режиме путем пневмопрессования, отделение сусла первой фракции, осветление сусла с предварительным охлаждением, внесение подкормки для дрожжей АF1 в количестве 0,9 г/дм3, сбраживание сусла активными сухими дрожжами Saccharomyces cerevisiae раса WT1 (Германия). Установлено, что выдержка виноматериала на дрожжевом осадке привела к снижению концентрации винной и янтарной кислот, количество яблочной и лимонной кислот не изменилось. Отмечено увеличение количества молочной, уксусной, валериановой и изовалериановой кислот. В результате обработки бентонитом снизились концентрации валериановой и изовалериановой кислот. В результате брожения виноградного сусла в присутствии сухих дрожжей образуется большое количество эфиров, определяющих специфические оттенки и формирующих аромат виноматериала. Выдержка виноматериала на дрожжевом осадке способствовала повышению концентрации ацетальдегида, метилацетата, ацеталей, высших спиртов, эфира этилвалериата. Количество других эфиров и терпеновых соединений значительно уменьшилось. Обработка виноматериала бентонитом привела к уменьшению количества ароматобразующих компонентов на 8 16. The influence of the method of technological processing of white table wine material on the composition and concentration of components of the aromatic complex and organic acids is considered. White table wine material Pinot Blanc harvest 2018 was as an object of research. Wine material is obtained according to the following scheme: processing of grapes in the soft mode by pneumomassage, the separation of the wort of the first fraction, wort clarification with preliminary cooling to fertilize for yeast AF1 in an amount of 0,9 g/dm3, the fermentation wort active dry yeast Saccharomyces cerevisiae, race, WT1 (Germany). It was found that the aging of wine material on yeast sediment led to a decrease in the concentration of tartaric and succinic acids, the amount of malic and citric acids has not changed. An increase in the amount of lactic, acetic, valerian and isovaleric acids was noted. Concentrations of valerian and isovaleric acids decreased as a result of treatment by bentonite. A large number of esters, which determine the specific shades and form the aroma of wine material, is formed as a result of fermentation of grape must in the presence of dry yeast. The wine material aging on yeast sediment has contributed to increasing concentration in wine acetaldehyde, and methyl acetate, acetals, higher alcohols, ether of ethylmalonate, a number of other esters and terpenic compounds is significantly reduced. Treatment of wine material by bentonite led to a decrease in the number of aromatic components by 8 16.

scholarly journals GRAPES BREEDED BY ALL-RUSSIAN RESEARCH INSTITUTE FOR VITICULTURE AND WINEMAKING FOR CREATION OF RED DESSERT WINES

Russian vine ◽  
2020 ◽  
Vol 14 ◽  
pp. 74-79
Author(s):  
N.V. Matveeva ◽  
◽  
M.V. Bahmetova ◽  
Keyword(s):  
Sugar Accumulation ◽  
Chemical Parameters ◽  
Wine Production ◽  
Organoleptic Characteristics ◽  
Russian Research Institute ◽  
Technological Evaluation ◽  
Grape Varieties ◽  
Physical And Chemical ◽  
Russian Research ◽  
Research Institute

The paper presents the results of technological evaluation of red wine varieties breeded by All-Russian Research Institute for Viticulture and Winemaking: Vesta, Cherny, Zhemchug, Au-gusta, Teremnoy, Mugofir. These varieties are characterized by high sugar accumulation. Li-queur wines were prepared using classical tech-nology. The research was conducted in the la-boratory of wine technology in micro-wine production. The weight of one batch of grapes was 10–25 kg. The main physical and chemical parameters of wort and wine were determined. Wine distillate was used as an alcoholic agent. For maintaining and enhancing the varietal aroma of grapes we used technology of frac-tional alcoholization. With the help of degusta-tions, organoleptic characteristics of the ob-tained samples of liqueur wines were carried out, as a result of which preliminary conclusions were made about the feasibility of using the studied varieties for the preparation of red li-queur wines. All the studied grape varieties can be recommended for the production of liqueur wines, pink and red.

scholarly journals Fermentación de la almendra de copoazú (Theobroma grandiflorum [Willd. ex Spreng.] Schum.): evaluación y optimización del proceso

2010 ◽  
Vol 11 (2) ◽  
pp. 107 ◽  
Author(s):  
Jenifer Criollo ◽  
Dagoberto Criollo ◽  
Angélica Sandoval Aldana
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Process Optimization ◽  
Fermentation Process ◽  
Raw Material ◽  
Sensory Panel ◽  
Yeast Saccharomyces Cerevisiae ◽  
Theobroma Grandiflorum ◽  
Cutting Test ◽  
Maximum Range ◽  
Low Levels

<p>La almendra de copoazú como producto promisorio para la industria de cosméticos, chocolate, bebidas, licores y conservas, se evaluó el proceso de fermentación variando el tiempo de remoción de la masa (24 y 48 horas) y la pulpa inicial (30 y 100%). Se tuvieron en cuenta las condiciones de los productores en el acceso a equipos de despulpado. Se cuantificó la temperatura de la masa en tres puntos (superior, medio e inferior), acidez, pH, humedad, prueba de corte y análisis sensorial. Se encontró bajo desarrollo de la temperatura de fermentación en los tratamientos con 100% de pulpa y se registraron las máximas temperaturas entre 35 y 36°C que indican deficiencias en el proceso; no se alcanzó los 40°C requeridos para la muerte del embrión. El 30% de pulpa inicial y la remoción cada 24 horas por 9 días, fueron las mejores condiciones encontradas. La optimización con 0,1% de levadura (Saccharomyces cerevisiae) aumentó la temperatura de fermentación hasta 44°C, los granos fermentados hasta 56,14% y el mayor desarrollo de sabores frutales con intensidad de 4, mostrando un mejor proceso de fermentación. El panel sensorial mostró que los licores de copoazú tienen notas frutales destacadas y bajos valores de otros sabores evaluados. Los resultados son semejantes a los cacaos criollos, conocidos en el mundo como materia prima de licores finos y de aroma.</p><p> </p><p><strong>Fermentation of the copoazu kernel (Theobroma grandiflorum [Willd. ex Spreng.] Schum.): Assessmente and process optimization</strong></p><p>The fermentation of copoazu kernels (a promising product for the cosmetics industry, chocolate, beverages, liquors and preserves) was evaluated varying the time of mass removal (24 and 48 hours) and the initial pulp (30 and 100%). This study took into account the degree of access the producers had to pulping equipment. We quantified temperature of the mass at three points (top, middle and bottom), acidity, pH, moisture, cutting test and sensory analysis. The observed temperatures during fermentation in the treatments with 100% pulp reached a maximum range between 35 and 36°C which indicated deficiencies in the process as the 40°C required for the death of the seed was not attained. Thirty percent initial pulp with removal every 24 hours for 9 days yielded the best results. Optimization with 0.1% yeast (Saccharomyces cerevisiae) increased the fermentation temperature to 44°C, augmented fermented beans to 56.14% and saw a development of fruit flavors with an intensity of 4, demonstrating a better fermentation process. The sensory panel showed that copoazu liquors have outstanding fruity notes and low levels of other evaluated flavors. The results are similar to the criollo cacao, known worldwide as a raw material for fine liquors and fragrances.</p>

scholarly journals Characterization and Dynamic Behavior of Wild Yeast during Spontaneous Wine Fermentation in Steel Tanks and Amphorae

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Cecilia Díaz ◽  
Ana María Molina ◽  
Jörg Nähring ◽  
Rainer Fischer
Keyword(s):  
Dynamic Behavior ◽  
Fermentation Process ◽  
Pilot Scale ◽  
Wine Fermentation ◽  
Lag Phase ◽  
Wild Yeast ◽  
Spoilage Yeasts ◽  
Wild Yeasts ◽  
Red Grape ◽  
Grape Varieties

We studied the dynamic behavior of wild yeasts during spontaneous wine fermentation at a winery in the Valais region of Switzerland. Wild yeasts in the winery environment were characterized using a PCR-RFLP method. Up to 11 different yeast species were isolated from the vineyard air, whereas only seven were recovered from the grapes surface. We initially investigated a cultureindependent method in pilot-scale steel fermentation tanks and found a greater diversity of yeasts in the musts from two red grape varieties compared to three white grape varieties. We found that the yeastsMetschnikowia pulcherrima,Rhodotorula mucilaginosa,Pichia kluyveri,P. membranifaciensandSaccharomyces cerevisiaeremained active at the end of the fermentation. We also studied the dynamic behavior of yeasts in Qvevris for the first time using a novel, highlysensitive quantitative real-time PCR method. We found that non-Saccharomycesyeasts were present during the entire fermentation process, withR. mucilaginosaandP. anomalathe most prominent species. We studied the relationship between the predominance of different species and the output of the fermentation process. We identified so-called spoilage yeasts in all the fermentations, but high levels of acetic acid accumulated only in those fermentations with an extended lag phase.

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