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VIEW ARTICLE    DOI: 10.1094/ASBCJ-62-0155

Effects of beta-Glucans, Shearing, and Environmental Factors on Wort Filtration Performance. Yu-Lai Jin, R. Alex Speers (1), and Allan T. Paulson, Department of Food Science and Technology, Dalhousie University, 1360 Barrington Street, D401, Halifax, NS B3J 2X4 Canada; and Robert J. Stewart, Labatt-ITW Technology Department Americas, 197 Richmond Street, London, ON N6A 4M3 Canada. (1) Corresponding author. Phone: +1(902) 494-3146; Fax: +1(902) 420-70219; E-mail: <Alex.Speers@Dal.Ca> J. Am. Soc. Brew. Chem. 62(4):155-162, 2004. Accepted July 14, 2004.

A model filtration device with diatomaceous earth (DE) as a filter bed was used to investigate the effects of beta-glucans, wort pH, maltose concentration, shearing, and shearing temperature on the efficiency of wort filtration at 76°C. A 0.45-µm membrane filtration of wort was performed at 20°C as an alternative test. High-molecular-weight beta-glucans increased wort resistance to DE cake filtration (76°C) and 0.45-µm membrane filtration (20°C). Shearing of wort samples impaired their filtration performance. High maltose concentrations and low pH values also were detrimental to wort filtration. Results of membrane filterability at 20°C correlated with that of DE filtration at 76°C. Keywords: Maltose, Wort pH


Efectos de beta-Glucanos, Esquileo, y Factores Ambientales en el Comportamiento de Filtración de Mosto

Un aparato modelo de filtración con tierra diatomeas (DE) como cama de filtro se utilizó para investigar los efectos de beta-glucanos, pH de mosto, concentración de maltosa, esquileo, y esquileo de temperatura en la eficiencia de filtración de mosto a 76°C. Una filtración de membrana de 0.45-µm de mosto se realizó a 20°C como prueba alternativa. beta-glucanos de peso molecular alto aumentaron la resistencia de mosto en filtración de bizocho de DE (76°C) y membrana de 0.45-µm (20°C). El esquileo de muestras de mosto dańó su comportamiento de filtración. Concentraciones altas de maltosa y valores bajos de pH también eran perjudiciales a la filtración del mosto. Los resultados de habilidad de filtración de membrana a 20°C tuvieron correlación con los de filtración de DE a 76°C. Palabras claves: Maltosa, pH de Mosto

 
 
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The ASBC Journal publishes scientific papers, review articles, and technical reports dealing with the chemistry and microbiology of brewing ingredients and relevant technology, as well as the analytical techniques used in the malting and brewing industry.