Abstract
L-Cysteine at low concentrations (up to 25 mg. cysteine-S per litre) in an other wise sulphur-deficient medium will support limited growth of the brewer's yeast under study. At higher concentrations (25–250 mg. cysteine-S per litre) cysteine is toxic and produces diminished growth. This effect is also observed when the yeast is grown in presence of sulphate, glutathione or L-methionine as sources of sulphur. Cysteine acts by prolonging the lag phase of growth without affecting cell size. Mercaptoacetate is also growth-inhibitory, but DL-homocysteine considerably less so. Cysteamine inhibits growth only when the sulphate concentration is suboptimal. Reduced glutathione, mercaptosuccinate and DL-penicillamine are not growth-inhibitory. Cysteine and to a lesser extent mercaptoacetate also depress the respiration of the yeast.
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.
