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Towards a Kieselguhr- and PVPP-Free Clarification and Stabilization Process of Rough Beer at Room-Temperature Conditions
Journal of Food Science ( IF 3.2 ) Pub Date : 2017-11-27 , DOI: 10.1111/1750-3841.13989
Alessio Cimini 1 , Mauro Moresi 1
Affiliation  

In this work, the main constraint (that is, beer chilling and chill haze removing) of the current beer conditioning techniques using Kieselguhr filtration and Polyvinylpolypyrrolidone (PVPP) treatment was overcome by developing a novel higher-throughput conditioning process, operating at room temperatures with no use of filter aids. The effect of filtration temperature (TF ) in the range of 0 to 40 °C on the hydraulic permeability of ceramic hollow-fiber (HF) membranes with nominal pore size of 0.2 to 1.4 μm, as well as on their limiting permeation flux (J* ) when feeding precentrifuged rough beer, was preliminarily assessed. When using the 1.4-μm HF membrane operating at TF ≥ 20 °C, it was possible to enhance the average permeation flux at values (676 to 1844 L/m2 /h), noticeably higher than those (250 to 500 L/m2 /h) characteristics of conventional powder filtration. Despite its acceptable permanent haze, the resulting beer permeate still exhibited colloidal instability. By resorting to the commercial enzyme preparation Brewers Clarex® before beer clarification, it was possible to significantly improve its colloidal stability as measured using a number of European Brewing Convention forcing tests, especially with respect to that of precentrifuged rough beer by itself. By combining the above enzymatic treatment with membrane clarification at 30 °C across the ceramic 1.4-μm HF membrane module, it was possible to limit the haze development due to chilling, sensitive proteins, and alcohol addition to as low as 0.78, 4.1, and 4.0 EBC-U, respectively, the enzymatic treatment being by far more effective than that using PVPP. PRACTICAL APPLICATION A novel Kieselguhr- and PVPP-free rough beer conditioning process at room temperatures was set up. By submitting precentrifuged rough beer to commercial preparation Brewers Clarex ® and then to membrane clarification at 30 °C across a ceramic 1.4-μm hollow-fiber membrane module, it was possible to obtain a clear and stable beer with a throughput (1306 ± 72 L/m2 /h) by far higher than that (250 to 500 L/m2 /h) characterizing the current powder filters. The haze development due to chilling, sensitive proteins, and alcohol adding was by far lower than that observed when microfiltering PVPP-pretreated rough beer.

中文翻译:

在室温条件下实现不含硅藻土和 PVPP 的粗啤酒澄清和稳定过程

在这项工作中,通过开发一种新的高通量调理工艺,在室温下运行不使用助滤剂。过滤温度 (TF) 在 0 至 40 °C 范围内对标称孔径为 0.2 至 1.4 μm 的陶瓷中空纤维 (HF) 膜的透水性及其限制渗透通量 (J * ) 在喂入预离心粗啤酒时,进行了初步评估。当使用在 TF ≥ 20 °C 下运行的 1.4-μm HF 膜时,可以提高平均渗透通量(676 至 1844 L/m2 /h),明显高于传统粉末过滤的那些(250 至 500 L/m2 /h)特性。尽管具有可接受的永久性雾度,但所得的啤酒渗透物仍然表现出胶体不稳定性。通过在啤酒澄清前使用商业酶制剂 Brewers Clarex®,可以显着提高其胶体稳定性,如使用许多欧洲酿造公约强制测试所测量的,特别是对于单独预离心粗啤酒的测定。通过将上述酶处理与在 30 °C 下穿过陶瓷 1.4-μm HF 膜组件的膜澄清相结合,可以将由于冷却、敏感蛋白质和酒精添加导致的雾度发展限制在低至 0.78、4.1 和4.0 EBC-U,分别,酶处理比使用 PVPP 更有效。实际应用 在室温下建立了一种新的不含硅藻土和 PVPP 的粗啤酒调理工艺。通过将预离心的粗啤酒提交给商业制备 Brewers Clarex ®,然后在 30 °C 下通过陶瓷 1.4-μm 中空纤维膜组件进行膜澄清,可以获得具有吞吐量 (1306 ± 72 L) 的清澈稳定的啤酒/m2 /h) 远高于当前粉末过滤器的特征值(250 至 500 L/m2 /h)。由于冷却、敏感蛋白质和酒精添加导致的浑浊发展远低于微过滤 PVPP 预处理粗啤酒时观察到的。通过将预离心的粗啤酒提交给商业制备 Brewers Clarex ®,然后在 30 °C 下通过陶瓷 1.4-μm 中空纤维膜组件进行膜澄清,可以获得具有吞吐量 (1306 ± 72 L) 的清澈稳定的啤酒/m2 /h) 远高于当前粉末过滤器的特征值(250 至 500 L/m2 /h)。由于冷却、敏感蛋白质和酒精添加导致的浑浊发展远低于微过滤 PVPP 预处理粗啤酒时观察到的。通过将预离心的粗啤酒提交给商业制备 Brewers Clarex ®,然后在 30 °C 下通过陶瓷 1.4-μm 中空纤维膜组件进行膜澄清,可以获得具有吞吐量 (1306 ± 72 L) 的清澈稳定的啤酒/m2 /h) 远高于当前粉末过滤器的特征值(250 至 500 L/m2 /h)。由于冷却、敏感蛋白质和酒精添加导致的浑浊发展远低于微过滤 PVPP 预处理粗啤酒时观察到的。
更新日期:2017-11-27
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