Shady,, T., Mehana, M. (2003). LACTrC ACID PRODUCTION BY MIXED CULTURES OF Lactobacillus delbrueckii subsp.· bulgaricus and Streptococcus sallvarius subsp. thermophilus GROWN ON DEPROTEINIZED WHEY. test, 28(12), 8231-8240. doi: 10.21608/jfds.2003.246690
T. S. M. Shady,; M. Y. Mehana. "LACTrC ACID PRODUCTION BY MIXED CULTURES OF Lactobacillus delbrueckii subsp.· bulgaricus and Streptococcus sallvarius subsp. thermophilus GROWN ON DEPROTEINIZED WHEY". test, 28, 12, 2003, 8231-8240. doi: 10.21608/jfds.2003.246690
Shady,, T., Mehana, M. (2003). 'LACTrC ACID PRODUCTION BY MIXED CULTURES OF Lactobacillus delbrueckii subsp.· bulgaricus and Streptococcus sallvarius subsp. thermophilus GROWN ON DEPROTEINIZED WHEY', test, 28(12), pp. 8231-8240. doi: 10.21608/jfds.2003.246690
Shady,, T., Mehana, M. LACTrC ACID PRODUCTION BY MIXED CULTURES OF Lactobacillus delbrueckii subsp.· bulgaricus and Streptococcus sallvarius subsp. thermophilus GROWN ON DEPROTEINIZED WHEY. test, 2003; 28(12): 8231-8240. doi: 10.21608/jfds.2003.246690

LACTrC ACID PRODUCTION BY MIXED CULTURES OF Lactobacillus delbrueckii subsp.· bulgaricus and Streptococcus sallvarius subsp. thermophilus GROWN ON DEPROTEINIZED WHEY

Journal of Food and Dairy Sciences
Article 6, Volume 28, Issue 12, December 2003, Pages 8231-8240    PDF (402.21 K)
Document Type: Original Article
DOI: 10.21608/jfds.2003.246690
Authors
T. S. M. Shady,1; M. Y. Mehana2
1Microblol. Dept., 5011, Water and Environ. Res. Institute, Agric. Res. Center, Giza, Egypt.
2Dairy Dept., Fac. of Agrlc., Mansoura Unlv., Mansoura. Egypt.
Abstract
Lactic acid is considered to be a very important organic acid, which used in
different food, dairy and other pharmaceutical industries. Therefore, the aim of this
work focused on the production of lactic acid with free and cc-lrnrnobillzed mixed
cultures which revealed that: starch hydrolyzate medium gave the highest lactic acid
co~nlraliOl'\. However, oeproleinizeo whey was found in the third order 01 lactic acid
production. Deprolelnized whey was used for further studies as a by-product from
cheese manufacture. 96 hours and 10% yeast extract Induced the production Of lactic
acid. The increase of lactic acid production in the fermentation media, as end
product, repressed Ihe production of lactic acid. 37°C was found as the optimum
temperature {Of lactic acid production. Lactic acid production was increased gradually
by increasing of inoculum size up to 3.0% (vlv, inoculum size to the producticn
media), Higher production of lactic acid was obtained by co-immobll1zed mixed
culture of L. de/bflJec1cii subsp. bulgaricus and S. saJiverius subsp. fhermophilus,
Increasing the Incubation time of co-irnrncbilaed mixed cultures, increased the
oevelopment of lactic acid concentration up to the end of fermentation time. 
Keywords
Lactic acid production, Lactobacillus delbflJeck; subsp, bulgaricus, Streptococcus sa/ivarius subsp, thermophllus, co-imrnobnuec-mtxec culture. Deproteinized whey
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