title: Joint effect of nitrogen sources and B vitamin supplementation of date juice on lactic acid production by Lactobacillus casei subsp. rhamnosus.
abstract: The use of date juice as a substrate for lactic acid production was investigated. Various nitrogen sources were compared with yeast extract for efficient lactic acid production by Lactobacillus casei subsp. rhamnosus. Among different nitrogen sources added to date juice (yeast extract, ammonium sulfate, tryptic soy, urea, peptone, and casein hydrolysate), yeast extract was the most efficient. The effect of yeast extract could have been due to its B vitamin content. The addition of five B vitamins at less than 25 mg/l to date juice with any nitrogen source enhanced lactic acid production to some extent, except for date juice with yeast extract or urea or peptone. The most significant increase was obtained with ammonium sulfate. Half of the yeast extract content (10 g/l) in a supplemented date juice could be replaced by a mixture of B vitamins at less than 25 mg/l, and ammonium sulfate at 2.6 g/l with no significant decrease in lactic acid production.
authors.affiliation: Department of Microbiology, Faculty of Sciences, University Ferhat Abbas, 19000 Setif, Algeria.
authors.forename: Aicha
authors.initials: A
authors.lastname: Nancib
authors.forename: Nabil
authors.initials: N
authors.lastname: Nancib
authors.forename: Djalal
authors.initials: D
authors.lastname: Meziane-Cherif
authors.forename: Abdelhafid
authors.initials: A
authors.lastname: Boubendir
authors.forename: Michel
authors.initials: M
authors.lastname: Fick
authors.forename: Joseph
authors.initials: J
authors.lastname: Boudrant
mesh_terms: D000645:Ammonium Sulfate / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D005285:Fermentation; D005638:Fruit / Q000737:chemistry*; D019344:Lactic Acid / Q000096:biosynthesis*; D007780:Lacticaseibacillus casei / Q000187:drug effects / Q000378:metabolism*; D009584:Nitrogen / Q000494:pharmacology*; D013997:Time Factors; D014803:Vitamin B Complex / Q000494:pharmacology*; D015003:Yeasts
chemical_list: D014803:Vitamin B Complex; D019344:Lactic Acid; D009584:Nitrogen; D000645:Ammonium Sulfate