Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 205, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfb.2021.111883
Keywords
Biosurfactant; Glycolipid; Nanomaterials; Metallic nanoparticles; Vesicles; Micelles
Funding
- Coordination for the Advancement of Higher Education Personnel (CAPES)
- State of Sao Paulo Research Foundation (FAPESP)
- National Council for Scientific and Technological Development (CNPq)
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This study utilized rhamnolipids produced from glycerol to stabilize silver nanoparticles and found that different pH values during synthesis of silver nanoparticles in the presence of rhamnolipids directly influence nanoparticle size and stability. The results indicated that increasing pH enhanced the stability of silver nanoparticles and larger particles were formed at lower pH values.
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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