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Valorization of coffee bean processing waste for bioethanol production: comparison and evaluation of mass transfer effects in fermentations using free and encapsulated cells of Saccharomyces cerevisiae

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Abstract

Coffee husk, an agricultural waste abundant in carbohydrates and nutrients, is typically discarded through landfills, mixed with animal fodder, or incinerated. However, in alignment with sustainable development principles, researchers worldwide are exploring innovative methods to harness the value of coffee husk, transforming it into profitable products. One such avenue is the biotechnological approach to bioethanol production from agricultural wastes, offering an eco-friendly alternative to mitigate the adverse effects of fossil fuels. This study delves into the feasibility of utilizing coffee husk as a substrate for bioethanol production, employing and comparing various hydrolysis methods. The enzymatic hydrolysis method outshone thermochemical and thermal approaches, yielding 1.84 and 3.07 times more reducing sugars in the hydrolysate, respectively. In examining bioethanol production, a comparison between free and encapsulated cells in enzyme hydrolysate revealed that free-cell fermentation faced challenges due to cell viability issues. Under specific fermentation conditions, bioethanol yield (0.59 and 0.83 g of bioethanol/g of reducing sugar) and productivity (0.1 and 0.12 g/L h) were achieved for free and encapsulated cells, respectively. However, it was noted that bioethanol production by encapsulated cells was more significantly influenced by internal mass transfer effects, as indicated by the Thiele modulus and effectiveness factor. In conclusion, our findings underscore the potential of coffee husk as a valuable substrate for bioethanol production, showcasing its viability in contributing to sustainable and eco-friendly practices.

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Authors and Affiliations

  1. Department of Biotechnology, M S Ramaiah Institute of Technology, Bangalore, 560 054, India

    G. Divyashri, N. P. Tulsi, T. P. Krishna Murthy, S. Shreyas, R. Kavya & I. K. Jaishree

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  1. G. Divyashri
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  2. N. P. Tulsi
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  3. T. P. Krishna Murthy
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  4. S. Shreyas
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  5. R. Kavya
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  6. I. K. Jaishree
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Contributions

GD: Conceived and designed the experiments; Analyzed and interpreted the data; Wrote the manuscript. NPT, SS, RK and IKJ: Performed the experiments. TPKM: Analysis and revision of manuscript.

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Correspondence to G. Divyashri.

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Divyashri, G., Tulsi, N.P., Murthy, T.P.K. et al. Valorization of coffee bean processing waste for bioethanol production: comparison and evaluation of mass transfer effects in fermentations using free and encapsulated cells of Saccharomyces cerevisiae. Bioprocess Biosyst Eng 47, 169–179 (2024). https://doi.org/10.1007/s00449-023-02961-7

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