Ultrasound-assisted liquid-state fermentation of soybean meal with Bacillus subtilis: Effects on peptides content, ACE inhibitory activity and biomass. (April 2020)

• Record Type: Journal Article
• Authors: Ruan, Siyu; Luo, Juan; Li, Yunliang; Wang, Yucheng; Huang, Shanfen; Lu, Feng; Ma, Haile
• Is Part Of: Process biochemistry. Volume 91(2020)
• Page Start: 73
• Page End: 82
• Publication Date: 2020-04
• Subjects: Ultrasound -- Fermentation -- Soybean meal -- Peptides -- ACE inhibitory activity -- Biomass; Biochemical engineering -- Periodicals; Biotechnology -- Periodicals; Biochemistry -- periodicals; Biotechnology -- periodicals; Chemical Engineering -- periodicals; Génie biochimique -- Périodiques; Biotechnologie -- Périodiques; Biochemical engineering; Biotechnology; Periodicals; 660.63
• DOI: 10.1016/j.procbio.2019.11.035
• Languages: English
• ISSNs: 1359-5113

Abstract

Graphical abstract: Highlights: A procedure of ultrasound-assisted fermentation for producing peptides was developed. The optimal ultrasonics was determined by the desirability function analyses. Appropriate ultrasound improved yields, purity and conversion rate of peptides. Fermented soybean meal showed high activity against ACE in vitro and in vivo . Ultrasonication could improve the biomass of microorganisms in fermentation process. Abstract: This work studied the effects of ultrasound-assisted liquid-state fermentation on the content of peptides and bioactivity of fermented soybean meal (FSBM) with Bacillus subtilis . Based on the optimization of basic ultrasonic parameters, effects of the main parameters including power density, incubation temperature and ultrasonic time on in vitro ACE inhibitory activity, peptides content and biomass of B. subtilis were investigated via Box-Behnken experimental design. Three mathematical models were determined to show the effects of each variable and their combinatorial interactions on dependent variables. A set of preferred condition was determined to be at power density of 0.08 W/mL for 1 h with an initial incubation temperature of 36.7 °C, according to the desirability function analyses. Under these conditions, the experimental values of in vitro ACE inhibitory activity, peptides content and biomass increased by 26.4%, 36.2% and 55.0% compared to those of the control, respectively, accompanied by the improvement of the peptides yield, purity and conversion rate in varying degrees. Additionally, FSBM resulted in a significant decrease of systolic blood pressure by 20.7 ± 1.8 mmHg in spontaneously hypertensive rats at 3 h. These results suggest that ultrasonication is an efficient solution for enhancing fermentation to produce bioactive components from agroindustrial by-products.