Flocculation and Haze Removal from Crude Beer Using In-House Produced Laccase from Trametes versicolor Cultured on Brewer鈥檚 Spent Grain
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- 作者：Gurpreet Singh Dhillon ; Surinder Kaur ; Satinder Kaur Brar ; Mausam Verma
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2012
- 出版时间：August 15, 2012
- 年：2012
- 卷：60
- 期：32
- 页码：7895-7904
- 全文大小：579K
- 年卷期：v.60,no.32(August 15, 2012)
- ISSN：1520-5118
文摘
The potential of brewer鈥檚 spent grain (BSG), a common waste from the brewing industry, as a support-substrate for laccase production by the well-known laccase producer Trametes versicolor ATCC 20869 under solid-state fermentation conditions was assessed. An attempt was made to improve the laccase production by T. versicolor through supplementing the cultures with inducers, such as 2,2-azino bis(3-ethylbenzthiazoline-6-sulfonic acid), copper sulfate, ethanol, gallic acid, veratryl alcohol, and phenol. A higher laccase activity of 13506.2 卤 138.2 IU/gds (gram dry substrate) was obtained with a phenol concentration of 10 mg/kg substrate in a tray bioreactor after 12 days of incubation time. The flocculation properties of the laccase treated crude beer samples have been studied by using various parameters, such as viscosity, turbidity, 味 potential, total polyphenols, and total protein content. The present results indicated that laccase (25 IU/L) showed promising results as a good flocculating agent. The laccase treatment showed better flocculation capacity compared to the industrial flocculation process using stabifix as a flocculant. The laccase treatments (25 IU/L) at 4 卤 1 掳C and room temperature have shown almost similar flocculation properties without much variability. The study demonstrated the potential of in-house produced laccase using brewer鈥檚 spent grain for the clarification and flocculation of crude beer as a sustainable alternative to traditional flocculants, such as stabifix and bentonite.