Growth of <i>Kluyveromyces marxianus</i> yeasts strains in deproteined whey obtained from dairy industry

Calil, Natalia Oliveira; Húngaro, Humberto Moreira; Ferraz, Flavio Oliveira; Ferreira, Aline Siqueira; Silva, Sílvio Silvério da

doi:10.1142/9789812837554_0092

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“…Ribonucleotides content produced by fermentation can be influenced by the type of microorganism, cultivation conditions, the extraction method and the analytical method applied for the quantification (Calil et al 2009). For instance, Belem and Lee (1999) reported RNA production (6.3 mg/g biomass) by K. marxianus var marxianus ATCC 28244 when grown on cheese whey.…”

Section: Resultsmentioning

confidence: 99%

“…The world production of cheese whey is estimated at over 10 8 tones per year could be an attractive raw material for the production of value-added compounds such as ethanol, single cell protein, organic acids, biodegradable plastics and oligonucleotides (Koushki et al 2011;Kolaei et al 2007;Li and Shahbazi 2006;Nath et al 2008;Belem and Lee 1999). However, only 15% of the available whey is used by industries (Calil et al 2009), being the great remaining part discarded as residual water in the environment (Saraiva et al 2009). Whey has high biological (40,000 ppm) and chemical oxygen demand (60,000 ppm) causing serious environmental problems for dairy industries (Ghaly et al 2007).…”

Section: Introductionmentioning

confidence: 99%

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Fermentative production of ribonucleotides from whey by Kluyveromyces marxianus: effect of temperature and pH

et al. 2011

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Ribonucleotides have shown many promising applications in food and pharmaceutical industries. The aim of the present study was to produce ribonucleotides (RNA) by Kluyveromyces marxianus ATCC 8,554 utilizing cheese whey, a dairy industry waste, as a main substrate under batch fermentation conditions. The effects of temperature, pH, aeration rate, agitation and initial cellular concentration were studied simultaneously through factorial design for RNA, biomass production and lactose consumption. The maximum RNA production (28.66 mg/g of dry biomass) was observed at temperature 30°C, pH 5.0 and 1 g/l of initial cellular concentration after 2 h of fermentation. Agitation and aeration rate did not influence on RNA concentration (p >0.05). Maximum lactose consumption (98.7%) and biomass production (6.0 g/l) was observed after 12 h of incubation. This study proves that cheese whey can be used as an adequate medium for RNA production by K. marxianus under the optimized conditions at industrial scale.

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Section: Resultsmentioning

confidence: 99%