KINETIC OF SUGAR CONSUMPTION AND ETHANOL PRODUCTION ON VERY HIGH GRAVITY FERMENTATION FROM SYRUP OF DATES BY- PRODUCTS (Phoenix dactylifera L.) BY USING Saccharomyces cerevisiae, Candida pelliculosa AND Zygosaccharomyces rouxii

Chniti, Sofien; Jemni, Monia; Bentaha, Imène; Shariati, Mohammad Ali; Kadmi, Yassine; Djelal, Hayet; Amrane, Abdeltif; Hassouna, Mnasser; Elmsellem, H.

doi:10.15414/jmbfs.2017.7.2.199-203

J microb biotech food sci

2017

DOI: 10.15414/jmbfs.2017.7.2.199-203

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KINETIC OF SUGAR CONSUMPTION AND ETHANOL PRODUCTION ON VERY HIGH GRAVITY FERMENTATION FROM SYRUP OF DATES BY- PRODUCTS (Phoenix dactylifera L.) BY USING Saccharomyces cerevisiae, Candida pelliculosa AND Zygosaccharomyces rouxii

Sofien Chniti¹,

Monia Jemni²,

Imène Bentaha³

et al.

Abstract: Three yeasts, Saccharomyces cerevisiae, Zygosaccharomyces rouxii and Candida pelliculosa, were tested for ethanol production on dates’syrup. In batch fermentation, the ethanol concentration depended on the initial sugar concentration and the yeast strain. For an initial sugar concentration of 17.4°Brix, maximum ethanol concentration was 63 g/L during S. cerevisiae growth, higher than the amounts achieved during Z. rouxii and C. pelliculosa growth, 33 g/L and 41 g/L respectively. On 35.8°Brix initial sugar amou… Show more

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Cited by 8 publications

References 20 publications

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Mechanism of lactose assimilation in microalgae for the bioremediation of dairy processing side-streams and co-production of valuable food products

Мірось

Kiani

et al. 2023

J Appl Phycol

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This study investigated the mechanism of lactose assimilation in Nannochloropsis oceanica for dairy-wastewater bioremediation and co-production of valuable feed/food ingredients in a circular dairy system (β-galactosidase and omega-3 polyunsaturated fatty acids). Mixotrophic cultivation was found to be mandatory for lactose assimilation in N. oceanica, with biomass production in mixotrophic cultures reaching a fourfold increase over that under heterotrophic conditions. Under mixotrophic conditions, the microalgae were able to produce β-galactosidase enzyme to hydrolyse lactose, with maximum extracellular secretion recorded on day 8 of growth cycle at 41.47 ± 0.33 U gbiomass−1. No increase in the concentration of glucose or galactose was observed in the medium, confirming the ability of microalgae to indiscriminately absorb the resultant monosaccharides derived from lactose breakdown. Population analysis revealed that microalgae cells were able to maintain dominance in the mixotrophic culture, with bacteria accounting for < 12% of biomass. On the other hand, under heterotrophic conditions, native bacteria took over the culture (occupying over 95% of total biomass). The bacteria, however, were also unable to effectively assimilate lactose, resulting in limited biomass increase and negligible production of extracellular β-galactosidase. Results from the study indicate that N. oceanica can be effectively applied for onsite dairy wastewater treatment under strict mixotrophic conditions. This is commercially disadvantageous as it rules out the possibility of deploying heterotrophic fermentation with low-cost bioreactors and smaller areal footprint.

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Mechanism of lactose assimilation in microalgae for the bioremediation of dairy processing side-streams and co-production of valuable food products

Мірось

Kiani

et al. 2023

J Appl Phycol

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Valorization of date waste using microbial fermentations

Khorshidian

Yousefi

2022

Biomass Conv. Bioref.

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An effective acid pretreatment of agricultural biomass residues for the production of second-generation bioethanol

et al. 2019

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Currently, the potential for energy recovery of plant biomass by biotechnological processes is a preferred solution for the use of agricultural products of low commercial value in order to produce bioenergy that is alternative to fossil fuels. The objective of this study was to obtain second-generation bioethanol by valorization of sugar beet and common dates of low quality. This involved separate hydrolysis and anaerobic fermentation process using the yeast strain Saccharomyces cerevisiae. Physicochemical and biochemical analyzes were carried out on beet and date substrates before and after alcoholic fermentation to determine their effect on yeast activity. The results showed that palm date was a good substrate for the microorganisms in contrast to sugar beet which required a high pretreatment in order to hydrolyze sucrose into fermentable sugars. After distillation, it was possible to recover bioethanol with a quality and a concentration depending on the substrate nature. For an initial sugar concentration of 12.0 °Brix, 74.7 g/kg DM of bioethanol (92.4 g/L) was produced by Saccharomyces from date syrup. In the presence of concentrated date syrup (22.2 °Brix), a lower efficiency of ethanol production was observed (78.2 g/L). It can be conclude that the diluted date substrate led to a good quality bioethanol with a high production yield. Statement of noveltyIn this project, we tried to valorize agricultural residues (Algerian sugar beet and palm date of low quality) for the production of bioethanol which can substitute fossil energies. Algeria is considered as one of the major producers and exporters of palm dates in the world, and thousands of tons of dates remain unused. Thus, these agricultural by-products could be recovered instead of being released into the environment by polluting it. In order to produce bioethanol, an effective pretreatment and optimal fermentation conditions were used. This project is part of a strategy to increase the feedstock exploitation and decrease the residues while producing clean and renewable energy.* Nabila Khellaf, khellafdaas@yahoo.fr |

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KINETIC OF SUGAR CONSUMPTION AND ETHANOL PRODUCTION ON VERY HIGH GRAVITY FERMENTATION FROM SYRUP OF DATES BY- PRODUCTS (Phoenix dactylifera L.) BY USING Saccharomyces cerevisiae, Candida pelliculosa AND Zygosaccharomyces rouxii

Cited by 8 publications

References 20 publications

Mechanism of lactose assimilation in microalgae for the bioremediation of dairy processing side-streams and co-production of valuable food products

Mechanism of lactose assimilation in microalgae for the bioremediation of dairy processing side-streams and co-production of valuable food products

Valorization of date waste using microbial fermentations

An effective acid pretreatment of agricultural biomass residues for the production of second-generation bioethanol

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