Mannan produced by Rhodotorula rubra strain 14

Elinov, N. P.; Vitovskaya, G. A.; Marikhin, Vacheslav A.; Marjukhta, Yulina B.; Kozlova, Tamara V.

doi:10.1016/s0008-6215(00)84637-6

Cited by 13 publications

(7 citation statements)

References 5 publications

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“…Yeast belonging to the different Cryptococcus, Hansenula, Rhodotorula, Lipomyces, Bullera, Sporobolomyces genera can synthesize exopolysaccharides. The polymer types reported for yeast producers include mannans, glucans, glucomannans, galactomannans and phosphomannans (Elinov et al 1979(Elinov et al , 1992Chiura et al 1982aChiura et al , 1982bHeald & Kristiansen 1985;Peterson et al 1989Peterson et al , 1990Vitovskaya et al 1989;Adami & Cavazzoni 1990;Vorotynskaya et al 1992). The authors of this paper have not come across any reports in the literature concerning the investigation of the yeast Rhodotorula acheniorum in terms of exopolysaccharide production.…”

Section: Introductionmentioning

confidence: 99%

Physico-chemical characterization of exomannan from Rhodotorula acheniorum MC

Pavlova

Панчев

Hristozova

2005

World J Microbiol Biotechnol

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The batch fermentation of Rhodotorula acheniorum MC on a culture medium containing 5% sucrose, mineral salts and yeast extract at 26°C for 96 h, with aeration at 0.75 v/v/m and agitation at 500 rev min )1 resulted in the synthesis of an exopolysaccharide (6.2 g l )1 ) which formed two fractions upon precipitation. The fractions were purified to a carbohydrate content of 98.2% for fraction I and 87.3% for fraction II. Mannose was the main monosaccharide component in a 92.8% concentration in fraction I and a 90.6% concentration in Fraction II. The exopolysaccharide was thus a mannan. The gel chromatograms confirmed the chemical composition of both fractions. The molecular weight of mannan I was 310 kD, whereas that of mannan II was 249 kD. The mannan I intrinsic viscosity [g] ¼ 6.23 dl g )1 was higher than that of mannan II [g] ¼ 2.73 dl g )1 . The water-binding capacity of the mannan samples was established within the 1.2-3.5 g g )1 range. The multiplicative model [g] ¼ 387.22. D À0:1913 r . T )1.095 . C 1.814 describing the effect of the velocity gradient D r , the exomannan concentration C and the temperature T on the dynamic viscosity values g of polymer solutions was obtained.

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Section: Introductionmentioning

confidence: 99%

Physico-chemical characterization of exomannan from Rhodotorula acheniorum MC

Pavlova

Панчев

Hristozova

2005

World J Microbiol Biotechnol

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“…Exopolysaccha rides are synthesized by microorganisms of various taxonomy (bacteria, fungi, yeast) (Calvo et al, 1995;Schuster et al, 1993;Sarkar et al, 1986;Igochi et al, 1990;Adami and Cavazzoni, 1990). Yeast polysaccharides can be used to obtain glucan, mannan and glucomannan (Sarkar et al, 1986;Elinov et al, 1979;Chiura et al, 1982). They have a protective function which boosts the specific immunobiological reactivity of the microorganism Elinov et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

“…Cultivated on synthetic growth media contain ing glucose, yeast of the species Moniella, Can dida, Lypomyces, Hansenula, Sporobolomyces, Bullera, Trichosporon, and Rhodotorula, synthe size exopolysaccharides containing mannose (Sarkar et al, 1986;Adami and Cavazzoni, 1990;Elinov et al, 1979). For synthesis of exopoly saccharides lactic-based substrate (native whey) (Igochi et al, 1990) and whey hydrolyzed with the enzyme preparation "ß-galactosidase" (Stauffer et al, 1978) have been used.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Mannose-Rich Exopolysaccharide by Rhodotorula glutinis 16P Co-Cultured with Yeast or Bacteria

Симова

Frengova

Бешкова

2000

Zeitschrift Für Naturforschung C

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Rhodotorula glutinis, Kluyveromyces lactis, Lactobacillus helveticus, ExopolysaccharidesExopolysaccharides from the lactose-negative yeast Rhodotorula glutinis 16P were synthe sized by co-cultivation with the yeast Kluyveromyces lactis MP11 or with the homofermentative lactic acid bacteria Lactobacillus helveticus 9A in a cheese whey ultrafiltrate. Exopoly saccharides were produced by lactose hydrolysis, performed by two pathways: with ß-galactosidase from Kluyveromyces lactis MP11 which assimilates glucose and galactose; with ß-galactosidase and Lactobacillus helveticus 9A which uses lactic acid. By growing the two mixed cultures maximum yield was obtained as follows: 11.4 g/1 and 15.8 g/1, respectively. Structural units of the carbohydrate composition of the two polymers are mannose ( 7 2 .4 -6 3 .5 % ), glucose (2 .0 -1 5 .9 % ), galactose (2 5 .3 -1 9 .8 % ) and xylose ( 3 .6 -4 .3 % ) . Mannose dominated in the polysaccharide compositions.

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“…The type of polymers produced by representatives of these genera are mannan, glucan, glucomannan, galactomannan, phosphomannan (5,10,17,18). Their protective role is expressed in enhancing the specific immunobiological reactivity of the macroorganism (8,11). The biological activity of yeast polysaccharides on the functional status of the macrophage has been found to depend on the charge and polymeric properties of the molecule, the glucosidic bonds and the mac-31 romolecular structure (11).…”

Section: Introductionmentioning

confidence: 99%

“…Their protective role is expressed in enhancing the specific immunobiological reactivity of the macroorganism (8,11). The biological activity of yeast polysaccharides on the functional status of the macrophage has been found to depend on the charge and polymeric properties of the molecule, the glucosidic bonds and the mac-31 romolecular structure (11). High-molecular fractions of yeast mannans also possess fibrinolytic activity (8).…”

Section: Introductionmentioning

confidence: 99%