Value-Added Production of Nisin from Soy Whey |
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Authors: | Debjani?Mitra III" target="_blank">Anthony?L?PomettoIII Samir?K?Khanal Bishnu?Karki Byron?F?Brehm-Stecher " target="_blank">J??van?Leeuwen |
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Institution: | (1) Biorenewable Resources and Technology Program, Iowa State University, Ames, IA 50011, USA;(2) Department of Food Science and Human Nutrition, Iowa State University, Ames, IA 50011, USA;(3) Department of Civil, Construction and Environmental Engineering, Iowa State University, 476 Town Engineering, Ames, IA 50011, USA;(4) Department of Agricultural and Biosystem Engineering, Iowa State University, Ames, IA 50011, USA;(5) Department of Food Science and Human Nutrition, Clemson University, Clemson, SC 29634-0316, USA;(6) Department of Molecular Biosciences and Bioengineering, University of Hawaii at Mānoa, Honolulu, HI 96822, USA; |
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Abstract: | The objective of this study was to evaluate the potential of low/negative value soy whey (SW) as an alternative, inexpensive
fermentation substrate to culture Lactococcus lactis subsp. lactis for nisin production. Initially, a microtiter plate assay using a Bioscreen C Microbiology Plate Reader was used for rapid
optimization of culture conditions. Various treatments were examined in efforts to optimize nisin production from SW, including
different methods for SW sterilization, ultrasonication of soy flake slurries for possible nutrient release, comparison of
diluted and undiluted SW, and supplementation of SW with nutrients. In subsequent flask-based experiments, dry bacterial mass
and nisin yields obtained from SW were 2.18 g/L and 619 mg/L, respectively, as compared to 2.17 g/L and 672 mg/L from a complex
medium, de Man–Rogosa–Sharpe broth. Ultrasonication of soybean flake slurries (10% solid content) in water prior to production
of SW resulted in ∼2% increase in biomass yields and ∼1% decrease in nisin yields. Nutrient supplementation to SW resulted
in ∼3% and ∼7% increase in cell and nisin yields, respectively. This proof-of-concept study demonstrates the potential for
use of a low/negative value liquid waste stream from soybean processing for production of a high-value fermentation end product. |
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