How does the fermentation temperature affect the total flavonoid content in fermented products?5 answersFermentation temperature significantly impacts the total flavonoid content in fermented products. Studies on various products like Phellinus baumii, tempe, lactic-acid-fermented mulberry juice, pomegranate alcoholic beverage, and Cabernet Sauvignon wines have shown that adjusting the fermentation temperature can influence the flavonoid yield. For instance, in P. baumii fermentation, a decrease in temperature from 30 °C to 28 °C during specific time intervals led to higher flavonoid productivity. Similarly, in lactic-acid-fermented mulberry juice, a temperature of 40 °C was optimal for obtaining the highest flavonoid content. Additionally, in Cabernet Sauvignon wines, a temperature of 28 °C resulted in wines with higher total phenolic compounds, anthocyanins, and flavonoids. These findings highlight the critical role of fermentation temperature in modulating flavonoid levels in various fermented products.
What is the optimal temperature range for fermenting acetic acid and what factors influence this range?4 answersThe optimal temperature range for fermenting acetic acid varies depending on the microorganism and the fermentation process. Studies have shown that for Acetobacter pasteurianus strains, the temperature range can be between 37°C to 40°C. On the other hand, Lactobacillus bulgaricus LB6 was found to produce ACE inhibitory peptides optimally at 42°C. Acetobacter aceti WK demonstrated efficient gluconic acid production during acetification at 37°C, indicating this temperature as suitable for high-temperature fermentation. Additionally, Acetobacter pasteurianus KBMNS-IAUF-2 showed high acetic acid production at 34°C, highlighting the importance of temperature in optimizing acetic acid yield. Factors influencing the optimal temperature range include the type of microorganism, the specific fermentation process, and the presence of other components like ethanol and metal ions in the fermentation medium.
How does fermentation temperatures affects the flavour compounds, such as, acids, higher alcohols, and esters in beer?5 answersFermentation temperatures play a crucial role in influencing the flavor compounds in beer, such as acids, higher alcohols, and esters. Different fermentation temperatures can impact the acidity and fruitiness of the final product. For instance, in beer production, temperature variations during fermentation can lead to changes in the levels of lactic acid, alcohols, aldehydes, and ketones, affecting the overall flavor profile. Optimal control of fermentation temperature is essential to maintain consistency and flavor in beer, with dynamic models helping to determine the best controller settings for energy efficiency and taste optimization. Therefore, by carefully regulating fermentation temperatures, brewers can manipulate the formation of flavor compounds to achieve desired taste characteristics in beer.
How does fermentation temperature affect the pH of beer?4 answersFermentation temperature significantly influences the pH of beer. Different studies highlight this impact: a dynamic model for beer fermentation emphasizes the importance of temperature regulation to maintain consistency and flavor, with temperature affecting fruitiness and acidity. Research on dry anaerobic fermentation shows that pH decreases rapidly at higher temperatures, with the lowest pH observed at 55℃, indicating a direct correlation between temperature and pH levels. Additionally, wine fermentation experiments reveal that succinic acid, yeast growth, and enzyme activity are key factors contributing to changes in titratable acidity and pH, with temperature playing a crucial role in these variations. These findings collectively demonstrate that fermentation temperature plays a vital role in determining the pH of beer, with higher temperatures often leading to lower pH levels.
How does fermentation temperature affect the FAN consumption of beer?4 answersFermentation temperature plays a crucial role in affecting the Free Amino Nitrogen (FAN) consumption during beer production. The temperature of fermentation significantly impacts various fermentation indices, including FAN consumption. Maintaining optimal fermentation temperature is essential for achieving desired FAN levels in beer. Temperature control is vital for regulating the consistency, flavor, and quality of the final product. Research has shown that the temperature of the fermentation substrate directly influences the primary fermentation process, affecting parameters such as extract values and overall beer quality. Additionally, studies have demonstrated that growth temperature influences the thermal stability of yeast strains, which can impact FAN consumption during fermentation. Therefore, precise temperature management is essential for controlling FAN levels and ensuring the desired sensory characteristics of the beer.
What happen during tempe fermentation? Does the temperature increases?3 answersDuring tempe fermentation, there are several changes that occur. The proteolytic capacity of Rhizopus strains isolated from tempe or tempe inocula was examined, and it was found that strains with high proteolytic activity were able to release nearly five times more amino acids after fermentation. In the case of Torulopsis glabrata 620, higher temperature during fermentation can enhance the rate of glucose consumption, cell growth, and pyruvate production, but it can also lead to a decrease in pyruvate yield. In the low-temperature fermentation ice wine brewing process, the temperature of the grape juice is increased to 18°C and then decreased to 13-15°C to carry out low-temperature fermentation, which helps to maintain the aroma and nutritional ingredients in grapes at their maximum. The specific changes in temperature during tempe fermentation were not mentioned in the abstracts provided.