共查询到19条相似文献,搜索用时 70 毫秒
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对麦汁煮沸系统发展进行回顾,并根据蒸发方式和作用点进行划分,并对几种现代麦汁煮沸系统的特点和工艺技术进行介绍。 相似文献
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背景:酚酸是强抗氧化物,先前的研究证明酚酸在麦芽和麦汁中含量不同。本文研究了麦汁煮沸和回旋沉淀对酚酸含量的影响。 相似文献
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对麦汁煮沸过程中不同的单宁添加量及添加时间进行了研究,结果表明,在麦汁煮沸结束前20min内添加单宁时,添加量40-50mg/kg;单宁作用时间为30-40min时,添加量30-50mg/kg;单宁作用时间为50min左右时,添加量为30min左右。 相似文献
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以往认为煮沸强度要达到一定范围才能使麦汁煮沸满足要求,实践显示,只要运用合适的处理方法,低煮沸强度的麦汁同样可以满足要求.根据麦汁煮沸设备的特点,通过优化麦汁煮沸工艺,降低煮沸强度,可达到节能和提高质量的目的. 相似文献
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麦汁煮沸二次蒸汽热能回收工艺及其系统的设计,该系统的运行每年可节省费用30多万元,二年即可收回设备投资。 相似文献
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麦汁的煮沸是啤酒发酵中最重要的工序,麦汁煮沸前后无论是物理性质还是化学成分变化极大,这对啤酒发酵风味影响很大,阐述了麦汁煮沸前后化学成分变化,对啤酒发酵合理控制有很大的启发作用。 相似文献
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Philip Wietstock Thomas Kunz Thomas Shellhammer Thore Schn Frank‐Jürgen Methner 《Journal of the Institute of Brewing》2010,116(2):157-166
The oxidative stability of wort at different stages during wort production and the radical scavenging characteristics of α‐, β‐, iso‐α‐acids and a hop polyphenol extract were evaluated using ESR spectroscopy and DPPH• radical quenching measurements. Radical generation in unhopped wort was significantly, positively correlated with heating rate prior to boiling but not with dissolved oxygen content. Hop α‐ and β‐acids showed similarly significant radical quenching abilities, while iso‐α‐acids and a hop polyphenol extract displayed a negligible effect. Isomerization of α‐acids to iso‐α‐acids reduced wort's antioxidative capacity. Commercially available hop products with varying polyphenol content showed similar radical inhibiting properties, which were a function of hop acid content. Relative to an unhopped treatment, hop additions to wort resulted in significantly lower amounts of Strecker aldehydes in stored beer. 相似文献
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使用ESR及DPPH自由基清除法评价麦汁制备各阶段的氧化稳定性及α-酸、β-酸、异-α-酸和酒花多酚浸膏的自由基清除特性。在未添加酒花的麦汁中自由基的产生与煮沸前的加热率正相关,但与溶解氧不相关。酒花α-酸及β-酸表现出相似的重要自由基清除能力。而异-α-酸与酒花多酚浸膏对自由基的清除能力较小。α-酸异构化后减小了麦汁的抗氧化活力,不同多酚含量的商用酒花制品由于酒花酸的作用表现出相似的自由基抑制特性。相对于不添加酒花的麦汁,添加酒花的麦汁制得的啤酒贮藏过程中Strecker醛的含量明显降低。 相似文献
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从麦汁煮沸过程中TBA值的改变、麦汁中可凝固氮的改变、酒花α-酸异构化率3个方面来论述麦汁煮沸对啤酒酿造质量的影响. 相似文献
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麦汁煮沸是啤酒糖化的重要工序,它对啤酒的胶体稳定性及风味稳定性起重要作用。本文介绍了麦汁外煮沸新技术及其试验结果。同时对其关键设备外加热器的设计问题进行了探讨,为今后推广应用提供了设计数据。 相似文献
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S. Kappler M. Krahl C. Geissinger T. Becker M. Krottenthaler 《Journal of the Institute of Brewing》2010,116(4):332-338
A detailed study on the degradation of iso‐α‐acids was conducted. Because of the complexity of the wort matrix and interfering interactions during real wort boiling, the investigation of degradation kinetics was performed in an aqueous solution. Degradation was investigated as a function of time (0–90 min), temperature (80–110°C), pH value (4–7), original gravity (10–18°P) and ion content of the water (0–500 ppm Ca2+ and Mg2+). After 90 min of boiling, over 20% of the dosed iso‐α‐acids could no longer be detected. A strong dependence of degradation could be shown due to high temperature, low pH, high original gravity and a high Mg2+ content. The cis:trans ratio and co‐iso‐α‐acid content did not change significantly. Losses of isohumulones could be lowered by reducing the temperature and original gravity, as well as by heightening the pH value. High amounts of Ca2+ and Mg2+ salts also led to an increase in degradation products. Solutions to decrease degradation and thereby possible improvements in sensory bitter quality are discussed. 相似文献
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延长煮沸时间和增加煮沸温度可降低麦芽汁凝固氮含量,但会增加麦汁色度;单宁的理想添加浓度为60mg/kg;添加复合硅胶可吸附沉淀部分蛋白质颗粒,降低啤酒色度,提高啤酒非生物稳定性。 相似文献