Introduction
Saccharomyces cerevisiae constitutes one of the most important yeasts to biotechnology. It has been employed as wine yeast, brewer’s, distiller’s and baker’s yeast (Jackson, 1994). In industrial applications, the choice of the appropriate strain and the operating temperature are important factors determining production cost and product quality. In wine making, fermentation temperatures between 20C and 28C are quite common, although the advantages of lower temperatures on the quality character is tics of the final product are well documented.In brewing, fermentations take place at lower temperatures varying between 10C and 15 C for ale beers and 7–9C for lager beers. Elevated fermentation tempera- tures (e.g. 35 C) result in high fermentation rates, increased pro- ductivity and low operational cost. Hence, a microorganism capable of performing alcoholic fermentation in a wide tempera- ture range could find plenty of applications in related industries.
Microbial fermentations offer a promising alternative in the production of sustainable energy. Recently, ethanol production by yeasts has received increasing attention due to its use as a vehicle fuel supplement. Brazil and the United States have invested significant resources in using blends of ethanol and gasoline as a fuel for motor vehicles. Currently, about 2% of the total transportation fuels in the USA are covered by bioethanol setting a goal of 30% by 2025. The European Union has established a goal of 5.75% bio- mass-derived transportation fuels by December of 2010. Ethanol could also be used as feedstock for other important chemical products with a much higher value such as acetaldehyde, ethylene, butadiene, acetic acid and hydrogen (Ragauskas et al., 2006; Rass-Hansen et al., 2007). Yeast ethanol fermentations require cooling facilities, in order to maintain a maximum temperature of30C, dueto yeast in activation a thigher temperatures.However fermentations at 35–40C or higher are considered advantageous since ethanol recovery is facilitated and operational cost is drasti- cally reduced due to avoidance of cooling controls, especially in tropical countries or during summer periods of many non-tropical countries.Therefore,it would be of economical and technicalinterest to operate fermentors at higher temperatures in many regions
แนะนำSaccharomyces cerevisiae ถือหนึ่ง yeasts สำคัญกับเทคโนโลยีชีวภาพ มีการจ้างยีสต์ไวน์ ของ brewer ของ distiller และเบเกอร์ยีสต์ของ (Jackson, 1994) ในงานอุตสาหกรรม หลากหลายสายพันธุ์ที่เหมาะสมและอุณหภูมิการปฏิบัติงานเป็นปัจจัยสำคัญที่กำหนดคุณภาพของผลิตภัณฑ์และต้นทุนผลิต ในการทำไวน์ หมักอุณหภูมิ 20 C และ 28 C เป็นปกติ แม้ว่าข้อดีของอุณหภูมิบนอักขระคุณภาพจะจัด tics ของผลิตภัณฑ์ final ดีในการทำการหมัก หมักแหนมเกิดที่อุณหภูมิแตกต่างกันระหว่าง 10 C C 15 สำหรับเบียร์เบียร์ และ C 7-9 สำหรับเบียร์ลาเกอร์ หมักยกระดับอุณหภูมิ-tures (เช่น 35 C) ผลลัพธ์ในการหมักสูงราคา โป ductivity เพิ่มขึ้น และต้นทุนการดำเนินงานต่ำ ดังนั้น ยังมีความสามารถในการหมักแอลกอฮอล์ในช่วงอุณหภูมิกว้าง-ture สามารถ find ของโปรแกรมประยุกต์ในอุตสาหกรรมที่เกี่ยวข้องได้Microbial fermentations offer a promising alternative in the production of sustainable energy. Recently, ethanol production by yeasts has received increasing attention due to its use as a vehicle fuel supplement. Brazil and the United States have invested significant resources in using blends of ethanol and gasoline as a fuel for motor vehicles. Currently, about 2% of the total transportation fuels in the USA are covered by bioethanol setting a goal of 30% by 2025. The European Union has established a goal of 5.75% bio- mass-derived transportation fuels by December of 2010. Ethanol could also be used as feedstock for other important chemical products with a much higher value such as acetaldehyde, ethylene, butadiene, acetic acid and hydrogen (Ragauskas et al., 2006; Rass-Hansen et al., 2007). Yeast ethanol fermentations require cooling facilities, in order to maintain a maximum temperature of30C, dueto yeast in activation a thigher temperatures.However fermentations at 35–40C or higher are considered advantageous since ethanol recovery is facilitated and operational cost is drasti- cally reduced due to avoidance of cooling controls, especially in tropical countries or during summer periods of many non-tropical countries.Therefore,it would be of economical and technicalinterest to operate fermentors at higher temperatures in many regions
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Introduction
Saccharomyces cerevisiae constitutes one of the most important yeasts to biotechnology. It has been employed as wine yeast, brewer’s, distiller’s and baker’s yeast (Jackson, 1994). In industrial applications, the choice of the appropriate strain and the operating temperature are important factors determining production cost and product quality. In wine making, fermentation temperatures between 20C and 28C are quite common, although the advantages of lower temperatures on the quality character is tics of the final product are well documented.In brewing, fermentations take place at lower temperatures varying between 10C and 15 C for ale beers and 7–9C for lager beers. Elevated fermentation tempera- tures (e.g. 35 C) result in high fermentation rates, increased pro- ductivity and low operational cost. Hence, a microorganism capable of performing alcoholic fermentation in a wide tempera- ture range could find plenty of applications in related industries.
Microbial fermentations offer a promising alternative in the production of sustainable energy. Recently, ethanol production by yeasts has received increasing attention due to its use as a vehicle fuel supplement. Brazil and the United States have invested significant resources in using blends of ethanol and gasoline as a fuel for motor vehicles. Currently, about 2% of the total transportation fuels in the USA are covered by bioethanol setting a goal of 30% by 2025. The European Union has established a goal of 5.75% bio- mass-derived transportation fuels by December of 2010. Ethanol could also be used as feedstock for other important chemical products with a much higher value such as acetaldehyde, ethylene, butadiene, acetic acid and hydrogen (Ragauskas et al., 2006; Rass-Hansen et al., 2007). Yeast ethanol fermentations require cooling facilities, in order to maintain a maximum temperature of30C, dueto yeast in activation a thigher temperatures.However fermentations at 35–40C or higher are considered advantageous since ethanol recovery is facilitated and operational cost is drasti- cally reduced due to avoidance of cooling controls, especially in tropical countries or during summer periods of many non-tropical countries.Therefore,it would be of economical and technicalinterest to operate fermentors at higher temperatures in many regions
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