ROS Theses Repository

View Item 
  •   ROS Home
  • Life Sciences
  • Doctoral Theses (Life Sciences)
  • View Item
  •   ROS Home
  • Life Sciences
  • Doctoral Theses (Life Sciences)
  • View Item
  •   ROS Home
  • Life Sciences
  • Doctoral Theses (Life Sciences)
  • View Item
  • Admin
JavaScript is disabled for your browser. Some features of this site may not work without it.

Metabolism of nitrogenous wort components by brewers' yeast

View/Open
LekkasC_0610_ls.pdf (3.701Mb)
Date
2010-06
Author
Lekkas, Christoforos
Metadata
Show full item record
Abstract
A quantitative and qualitative identification of the nitrogenous constituents of unfermented and final fermented wort has been performed for five industrial yeast strains. Results highlight the importance of three key amino acids in yeast fermentation performance. Supplementation of wort using individual amino acids and ammonia clearly demonstrate lysine and arginine to be marker nitrogen wort constituents. Synergistic effects of individual wort free amino acids and ammonia on yeast fermentation efficiency were also examined. Further analysis of nitrogeneous wort constituents included examination of oligopeptides with a molecular weight of less than 500 Daltons and the influence of yeast proteases on the availability of small peptides during fermentation. Both lager and ale yeast can simultaneously use amino acids and small peptides as sources of assimilable nitrogen. Laboratory malt and mash analysis of 28 malt types revealed that 80-95% of total free amino nitrogen originates during malting and the remaining 5-20% during mashing.
URI
http://hdl.handle.net/10399/2368
Collections
  • Doctoral Theses (Life Sciences)

Browse

All of ROSCommunities & CollectionsBy Issue DateAuthorsTitlesThis CollectionBy Issue DateAuthorsTitles

ROS Administrator

LoginRegister
©Heriot-Watt University, Edinburgh, Scotland, UK EH14 4AS.

Maintained by the Library
Tel: +44 (0)131 451 3577
Library Email: libhelp@hw.ac.uk
ROS Email: open.access@hw.ac.uk

Scottish registered charity number: SC000278

  • About
  • Copyright
  • Accessibility
  • Policies
  • Privacy & Cookies
  • Feedback
AboutCopyright
AccessibilityPolicies
Privacy & Cookies
Feedback
 
©Heriot-Watt University, Edinburgh, Scotland, UK EH14 4AS.

Maintained by the Library
Tel: +44 (0)131 451 3577
Library Email: libhelp@hw.ac.uk
ROS Email: open.access@hw.ac.uk

Scottish registered charity number: SC000278

  • About
  • Copyright
  • Accessibility
  • Policies
  • Privacy & Cookies
  • Feedback
AboutCopyright
AccessibilityPolicies
Privacy & Cookies
Feedback