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Mathematical model for Phaffia rhodozyma growth using peat hydrolysates as substrate
Author(s) -
Vázquez Manuel,
Martin Antonio M
Publication year - 1998
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/(sici)1097-0010(199804)76:4<481::aid-jsfa973>3.0.co;2-z
Subject(s) - yeast , biomass (ecology) , hydrolysate , astaxanthin , substrate (aquarium) , chemostat , fermentation , food science , peat , chemistry , productivity , hydrolysis , botany , biology , biochemistry , agronomy , ecology , bacteria , genetics , macroeconomics , economics , carotenoid
The potential of peat hydrolysates for the production of astaxanthin from Phaffia rhodozyma yeast biomass in continuous fermentation was studied. Chemostat fermentations of the yeast were performed using peat hydrolysates as substrate. Kinetic parameters were calculated for the growth of the yeast and the biomass productivity was determined using mathematical models. A low maximum specific growth rate (μ max =0·08 h −1 ) and a high Monod constant ( Ks =26·2×10 3 ) were obtained for this substrate. The low maintenance energy requirement found, 0·020 g (gh) −1 , confirms the aerobic metabolism of the yeast with this substrate. Under selected conditions, a biomass productivity of 0·108 g (lh) −1 and an astaxanthin productivity of 0·046 mg (lh) −1 were obtained. The biomass produced had a high protein and astaxanthin content (490±8 g kg −1 and 0.43±0.07 g kg −1 , respectively), indicating that it can be used as a feed additive. © 1998 SCI.