Pulsed electric field treatment applied to microbreweries for processing craft beer

脉冲电场处理应用于小型啤酒厂精酿啤酒加工

• 批准号: 513898-2017
• 负责人: Jayaram, Sheshakamal
• 金额: $ 1.82万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=640041
• 关键词: Pulsed; electric; field; treatment; applied

Heat treatment methods such as thermal pasteurization are predominantly utilized as a means to inactivatespoilage microbes. However, heat treatment methods are energy intensive and adversely affect nutritional andorganoleptic quality of the preserved food. In the recent years non-thermal processes like pulsed electric field(PEF) technology has been investigated for commercial applications. PEF devices consist of a pair ofelectrically conductive metal electrodes, separated by a known gap distance. High voltage pulses are applied toone of the electrodes while keeping the other electrode at ground potential. The resulting electric field causesirreversible breakdown of cell membrane; hence microbial inactivation.Brewery regulations in Canada do not necessitate pasteurization of craft beer; hence, PEF processing finds apotential application in the brewing industry. PEF treatment being a non-thermal, the fresh like taste and thenutritional value are better retained than with conventional thermal pasteurization. However, due to the flow ofcurrent during the PEF processing, metal ions are released from the electrodes. The amount of metal releaseddepends on the type of product, the specific composition of electrodes and the type of pulses used. Thisproposed research investigates the applicability of the PEF processing to craft beer, through a pressurizedprocessing chamber that has been designed to eliminate release of most metal ions.With a strong cooperation between the University of Waterloo and Innocente Brewing Company, we areconfident in demonstrating the effectiveness of the PEF pasteurization for craft beer, using the modified UW'sPEF facility. Systematic tests with precise control of the applied pulse, treatment time, and other parameters,like medium temperature and energy are being considered to evaluate metal ions released during the PEFprocessing and their consequent effect, if any, on the taste and the shelf life. The knowledge and technologythat are expected as outcome of this research are of direct benefit for microbreweries in promoting their newpremium products.

热处理方法如热巴氏杀菌主要用作灭活腐败微生物的手段。然而，热处理方法是能源密集型的，并对腌制食品的营养和感官质量产生不利影响。近年来，非热过程如脉冲电场（PEF）技术已被研究用于商业应用。PEF设备由一对导电金属电极组成，由已知的间隙距离分开。将高压脉冲施加到电极之托内，同时保持另一电极处于地电位。由此产生的电场导致细胞膜的不可逆破坏;因此微生物失活。加拿大的啤酒厂法规不需要对精酿啤酒进行巴氏灭菌;因此，PEF处理在酿造工业中具有潜在的应用。PEF处理是一种非热处理，与传统的热巴氏杀菌相比，它能更好地保留新鲜的口感和营养价值。然而，由于在PEF处理期间的电流流动，金属离子从电极释放。释放的金属量取决于产品的类型、电极的具体成分和所用脉冲的类型。本研究旨在通过一个旨在消除大多数金属离子释放的加压处理室来研究PEF处理工艺对精酿啤酒的适用性。在滑铁卢大学和Innocente Brewing Company之间的密切合作下，我们有信心使用改进后的UW's PEF设施来证明PEF巴氏杀菌工艺对精酿啤酒的有效性。正在考虑通过精确控制所施加的脉冲、处理时间和其他参数（如介质温度和能量）的系统测试来评估PEF加工过程中释放的金属离子及其对味道和保质期的后续影响（如果有的话）。本研究的知识和技术预期成果将直接有益于微型啤酒厂推广其新的优质产品。