iosynthesis of gamma-Polyglutamic Acid by Bacillus licheniformis Through Submerged Fermentation (SmF) and Solid-state Fermentation (SSF

Author(s)

Campos, V. ^[1] ; Kaspary, R. M. ^[1] ; Rossi, M. J. ^[2] ; Medeiros, T. A. M. ^[1]

Affiliation

^[1] Sao Paulo State Univ UNESP, Inst Sci & Technol, Sorocaba, SP - Brazil

^[2] Federal Univ Santa Catarina, Dept Microbiol Immunol & Parasitol, Florianopolis, SC - Brazil

• Document type: Journal article
• Source: CHEMICAL AND BIOCHEMICAL ENGINEERING QUARTERLY; v. 35, n. 3, p. 333-344, 2021.
• Web of Science Citations: 0

Abstract

Gamma-Polyglutamic acid (gamma-PGA) was produced from fermentation processes by inoculating the bacterium Bacillus licheniformis on different substrates. In submerged fermentation (SmF), glycerol and glucose were used as the main carbon substrates while ammonium sulfate served to provide nitrogen. In solid-state fermentation (SSF), soybean was used as the main substrate. Tests carried out in an airlift bioreactor with B. licheniformis showed a maximum productivity of 0.789 g L-1 h(-1) and a yield of 0.4 g g(-1). Different soybean cultivars from the 2015 and 2016 crops were used in the SSF. The BRS 1001IPRO cultivar, from the 2016 crop, showed the highest production, i.e., 1.2 g L-1 of gamma-PGA. This cultivar was subjected to different levels of milling (fine, intermediate and coarse). Coarsely milled grains increased.-PGA production to 2.7 g L-1. Moreover, coarse milling made the internal nutrients of the grains available for fermentation and this particle size did not compromise aeration during fermentation. (AU)

• FAPESP's process: 15/02650-8 - Production and environmental application of y-polyglutamic acid by cultivation of B. subtilis in soy substrate
• Grantee: Valquiria de Campos
• Support Opportunities: Regular Research Grants