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Optimization and characterization of rhamnolipid production by Pseudomonas aeruginosa NY3 using waste frying oil as the sole carbon
Author(s) -
Sun Han,
Wang Lei,
Nie Hongyun,
Diwu Zhenjun,
Nie Maiqian,
Zhang Bo
Publication year - 2021
Publication title -
biotechnology progress
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.572
H-Index - 129
eISSN - 1520-6033
pISSN - 8756-7938
DOI - 10.1002/btpr.3155
Subject(s) - rhamnolipid , yield (engineering) , chemistry , central composite design , fourier transform infrared spectroscopy , congener , abelmoschus , chromatography , pseudomonas aeruginosa , response surface methodology , chemical engineering , materials science , bacteria , biology , agronomy , genetics , engineering , metallurgy
Yield and cost are two major factors limiting the widespread use of rhamnolipids (RLs). In the present study, waste frying oil (WFO) was used as the sole carbon source to produce environmentally friendly RLs by Pseudomonas aeruginosa NY3. The Plackett–Burman design (PBD) and Box–Behnken design (BBD) methods were used to maximize the production yield of RL. The PBD results showed that the concentrations of NaNO 3 , Na 2 HPO 4 , and trace elements were the key factors affecting the yield of RL. Furthermore, the BBD results showed that at NaNO 3 , Na 2 HPO 4 , and trace elements concentrations were 4.95, 0.66, and 0.64 mL/L, respectively, the average RL yield reached 9.15 ± 0.52 g/L, 1.58‐fold higher than that observed before optimization. Fourier transform infrared spectroscopy (FTIR) and liquid chromatography‐ion trap‐time of flight mass spectrometry (LCMS‐IT‐TOF) were used to elucidate the diversity of RL congeners. The results showed that, after optimization, the RL congener diversity increased, and the major RL constituent was converted from di‐RLs (64.04%) to mono‐RLs (60.44%). These results suggested that the concentrations of the components contained in the culture medium of P. aeruginosa NY3 influenced not only the yield of RL, but also its congener distribution.