Publication: Hydrothermal decomposition of yeast cells for production of proteins and amino acids
Issued Date
2006-10-11
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ISSN
03043894
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2-s2.0-33749067153
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Hazardous Materials. Vol.137, No.3 (2006), 1643-1648
Suggested Citation
Wiwat Lamoolphak, Motonobu Goto, Mitsuru Sasaki, Manop Suphantharika, Chirakarn Muangnapoh, Chattip Prommuag, Artiwan Shotipruk Hydrothermal decomposition of yeast cells for production of proteins and amino acids. Journal of Hazardous Materials. Vol.137, No.3 (2006), 1643-1648. doi:10.1016/j.jhazmat.2006.05.029 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/23252
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Title
Hydrothermal decomposition of yeast cells for production of proteins and amino acids
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Abstract
This study examines hydrothermal decomposition of Baker's yeast cells, used as a model for spent Brewer's yeast waste, into protein and amino acids. The reaction was carried out in a closed batch reactor at various temperatures between 100 and 250 °C. The reaction products were separated into water-soluble and solid residue. The results demonstrated that the amount of yeast residue decreased with increasing hydrolysis temperature. After 20 min reaction in water at 250 °C, 78% of yeast was decomposed. The highest amount of protein produced was also obtained at this condition and was found to be 0.16 mg/mg dry yeast. The highest amount of amino acids (0.063 mg/mg dry yeast) was found at the lowest temperature tested after 15 min. The hydrolysis product obtained at 200 °C was tested as a nutrient source for yeast growth. The growth of yeast cells in the culture medium containing 2 w/v% of this product was comparable to that of the cells grown in the medium containing commercial yeast extract at the same concentration. These results demonstrated the feasibility of using subcritical water to potentially decompose proteinaceous waste such as spent Brewer's yeast while recovering more useful products. © 2006 Elsevier B.V. All rights reserved.