Caroteno-protein and exopolysaccharide production by co-cultures of Rhodotorula glutinis and Lactobacillus helveticus |
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Authors: | G Frengova E Simova D Beshkova |
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Institution: | (1) Laboratory of Applied Microbiology, Institute of Microbiology, Bulgarian Academy of Sciences, 4002 Plovdiv, 26 Maritza Blvd, Bulgaria, BG |
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Abstract: | The lactose-negative yeast Rhodotorula glutinis 22P and the homofermentative lactic acid bacterium Lactobacillus helveticus 12A were cultured together in a cheese whey ultrafiltrate containing 42 g L−1 lactose. The chemical composition of the caroteno-protein has been determined. The carotenoid and protein contents are 248
μ g g−1 dry cells and 48.2% dry weight. Carotenoids produced by Rhodotorula glutinis 22P have been identified as β-carotene 15%, torulene 10%, and torularhodin 69%. After separating the cell mass from the microbial association, the exopolysaccharides
synthesized by Rhodotorula glutinis 22P were isolated from the supernatant medium in a yield of 9.2 g L−1. The monosaccharide composition of the synthesized biopolymer was predominantly D-mannose (57.5%).
Received 08 July 1996/ Accepted in revised form 11 December 1996 |
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Keywords: | : Rhodotorula glutinis Lactobacillus helveticus cheese whey ultrafiltrate microbial association carotenoids caroteno-protein exopolysaccharides |
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