caa a22 4500 465822290 CHVBK 20180323112138.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF00903772 doi (NATIONALLICENCE)springer-10.1007/BF00903772 The effect of yeast extract supplementation on the production of lactic acid from whey permeate by Lactobacillus helueticus [Elektronische Daten] [A. Aeschlimann, U. von Stockar] Summary: Batch and continuous two-stage cultures have been conducted in order to determine the effect of yeast extract (YE) on the homolactic fermentation of whey permeate byLactobacillus helveticus. Supplementation with YE had a significant effet on lactic acid concentration, volumetric productivity, and substrate conversion, but not on lactic acid yield. Volumetric productivity in the first stage increased from 2 to 9 g l−1 per hour by increasing the YE concentration from 1.5 to 25 g l−1 At the same time conversion improved from 22% to 93% at a dilution rate of 0.2 h−1. The second stage demonstrated the effect of YE at a lower dilution rate (0.14 h−1. A high system conversion (97%) and a high final lactic acid concentration (40 g l−1) were achieved with 10 g l−1 YE. Springer-Verlag, 1990 Aeschlimann A. Institute of Chemical Engineering, Swiss Federal Institute of Technology, CH-1015, Lausanne, Switzerland aut von Stockar U. Institute of Chemical Engineering, Swiss Federal Institute of Technology, CH-1015, Lausanne, Switzerland aut Applied Microbiology and Biotechnology Springer-Verlag 32/4(1990-01-01), 398-402 0175-7598 32:4<398 1990 32 253 https://doi.org/10.1007/BF00903772 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00903772 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Aeschlimann A. Institute of Chemical Engineering, Swiss Federal Institute of Technology, CH-1015, Lausanne, Switzerland aut NATIONALLICENCE 700 1- von Stockar U. Institute of Chemical Engineering, Swiss Federal Institute of Technology, CH-1015, Lausanne, Switzerland aut NATIONALLICENCE 773 0- Applied Microbiology and Biotechnology Springer-Verlag 32/4(1990-01-01), 398-402 0175-7598 32:4<398 1990 32 253 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer