Abstract
The infusion method used in mashing well-modified malt could be a source of problems associated with malt processing. This study showed that when well-modified barley malt was mashed at an infusion temperature of 65�C the actual internal temperature of the mash was 63�C (65/63�C). Under this mashing condition, good results were obtained for both free amino nitrogen (FAN) products and predicted spirit yield (PSY). Filtration rates were also encouraging because it was possible to collect up to 250 mL of wort in record time. Similarly, when malt was mashed at an infusion temperature of 67�C, the actual internal temperature of the mash was 65�C (67/65�C). Again, good results were obtained for both FAN products and PSY, with a marginal increase of 0.5% obtained for PSY. Filtration rates were also good, because it was possible to collect up to 250 mL of wort in record time. A very strong correlation (R(^2) = 0.9999) was found between filtration rates for infusion mash at 67/65�C and 65/63�C. When the infusion mashing temperature was increased to 69�C, it corresponded to an internal mash temperature of 67�C. Under this infusion mashing condition (69/67�C), a marginal drop in FAN product release occurred, it took longer than 2 h to collect 200 mL of wort, and collection of 250 mL of wort was very difficult to achieve. Although strong correlations were found for filtration rates of infusion mash at 69/67�C versus 65/63�C and infusion mash at 69/67�C versus 67/65�C (R(^2) = 0.975 or 0.973, respectively), a decline was observed compared with infusion mash at 67/65�C versus 65/63�C (R(^2) = 0.9999). The 69/67�C mashing experiment resulted in a decrease of 0.6% for PSY. It appears that a rise in temperature of 2 degrees Celsius in internal mash from 65 to 67�C caused the release of materials that impeded filtration, as well as the release of some materials that were not fermentable. Optimum results were obtained when infusion mashing was performed at 67/65�C.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
