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Guava Seed Oil: Potential Waste for the Rhamnolipids Production. FERMENTATION 2022. [DOI: 10.3390/fermentation8080379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Guava is consumed in natura and is also of considerable importance to the food industry. The seeds and peel of this fruit are discarded, however, guava seeds yield oil (~13%) that can be used for the bioproducts synthesis. The use of a by-product as a carbon source is advantageous, as it reduces the environmental impact of possible harmful materials to nature, while adding value to products. In addition, the use of untested substrates can bring new yield and characterization results. Thus, this research sought to study rhamnolipids (RLs) production from guava seed oil, a by-product of the fructorefinery. The experiments were carried out using Pseudomonas aeruginosa LBI 2A1 and experimental design was used to optimize the variables Carbon and Nitrogen concentration. Characterization of RLs produced occurred by LC-MS. In this study, variables in the quadratic forms and the interaction between them influenced the response (p < 0.05). The most significant variable was N concentration. Maximum RLs yield achieved 39.97 g/L, predominantly of mono-RL. Characterization analysis revealed 9 homologues including the presence of RhaC10C14:2 (m/z 555) whose structure has not previously been observed. This research showed that guava seed oil is an alternative potential carbon source for rhamnolipid production with rare rhamnolipid homologues.
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Process Development in Biosurfactant Production. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2022; 181:195-233. [DOI: 10.1007/10_2021_195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Salazar-Bryam AM, Yoshimura I, Santos LP, Moura CC, Santos CC, Silva VL, Lovaglio RB, Costa Marques RF, Jafelicci Junior M, Contiero J. Silver nanoparticles stabilized by ramnolipids: Effect of pH. Colloids Surf B Biointerfaces 2021; 205:111883. [PMID: 34102528 DOI: 10.1016/j.colsurfb.2021.111883] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 04/29/2021] [Accepted: 05/23/2021] [Indexed: 10/21/2022]
Abstract
Rhamnolipids are glycolipid biosurfactants that have remarkable physicochemical characteristics, such as the capacity for self-assembly, which makes these biomolecules a promising option for application in nanobiotechnology. Rhamnolipids produced from a low-cost carbon source (glycerol) were used to stabilize silver nanoparticles. Silver nanoparticles (AgNPs) have been the subject of studies due to their physical chemical as well as biological properties, which corroborate their catalytic and antimicrobial activity. We compared nanoparticles obtained with three different pH values during synthesis (5, 7 and 9) in the presence of rhamnolipids. Dynamic light scattering showed that larger particles were formed at pH 5 (78-190 nm) compared to pH 7 (6.5-43 nm) and 9 (5.6-28.1 nm). Moreover, nanoparticle stability (analyzed based on the zeta potential) was enhanced with the increase in pH from 5 to 9 (-29.86 ± 1.04, -37.83 ± 0.90 and -40.33 ± 0.57 mV, respectively). Field emission gun scanning electron microscopy confirmed the round morphology of the silver nanoparticles. The LSPR spectra of AgNP for the pHs studied are conserved. In conclusion, different pH values in the presence of rhamnolipids used in the synthesis of silver nanoparticles directly affect nanoparticle size and stability.
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Affiliation(s)
| | - Ingrid Yoshimura
- São Paulo State University (Unesp), Institute of Biosciences, Rio Claro, São Paulo, Brazil
| | - Larissa Provasi Santos
- São Paulo State University (Unesp), Institute of Biosciences, Rio Claro, São Paulo, Brazil
| | - Cinthia Cristine Moura
- São Paulo State University (Unesp), Institute for Research in Bioenergy, Rio Claro, São Paulo, Brazil
| | - Caio Carvalho Santos
- São Paulo State University (Unesp), Institute of Chemistry, Araraquara, São Paulo, Brazil
| | - Vinicius Luiz Silva
- São Paulo State University (Unesp), Institute of Biosciences, Rio Claro, São Paulo, Brazil
| | | | | | | | - Jonas Contiero
- São Paulo State University (Unesp), Institute of Biosciences, Rio Claro, São Paulo, Brazil; São Paulo State University (Unesp), Institute for Research in Bioenergy, Rio Claro, São Paulo, Brazil.
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