Silver nanoparticles stabilized by ramnolipids: Effect of pH

Salazar-Bryam, Ana María; Yoshimura, Ingrid; Santos, Larissa Provasi; Moura, Cinthia Cristine de; Santos, Caio Carvalho dos; Silva, Vinicius Luiz; Lovaglio, Roberta Barros; Marques, Rodrigo Fernando Costa; Jafelicci, Miguel; Contiero, Jonas

doi:10.1016/j.colsurfb.2021.111883

Cited by 23 publications

(13 citation statements)

References 52 publications

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“…These nanoparticles have demonstrated broad-spectrum activity against bacteria and fungi. Salazar-Bryam et al (2021) investigated the effect of pH on the synthesis of silver nanoparticles stabilized by glycolipid surfactants: rhamnolipids. A comparison of physical properties and nanoparticle stability was carried out for the particles synthesized at pH 5, 7, and 9.…”

Section: Bacterial Extract As a Capping Agentmentioning

confidence: 99%

Role of Biogenic Capping Agents in the Synthesis of Metallic Nanoparticles and Evaluation of Their Therapeutic Potential

Sidhu

Verma

Kaushal

2022

Front. Nanotechnol.

135

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The biomedical properties of nanoparticles have been the area of focus for contemporary science; however, there are issues concerning their long-term toxicities. Recent trends in nanoparticle fabrication and surface manipulation, the use of distinctive biogenic capping agents, have allowed the preparation of nontoxic, surface-functionalized, and monodispersed nanoparticles for medical applications. These capping agents act as stabilizers or binding molecules that prevent agglomeration and steric hindrance, alter the biological activity and surface chemistry, and stabilize the interaction of nanoparticles within the preparation medium. Explicit features of nanoparticles are majorly ascribed to the capping present on their surface. The present review article is an attempt to compile distinctive biological capping agents deployed in the synthesis of metal nanoparticles along with the medical applications of these capped nanoparticles. First, this innovative review highlights the various biogenic capping agents, including biomolecules and biological extracts of plants and microorganisms. Next, the therapeutic applications of capped nanoparticles and the effect of biomolecules on the efficiency of the nanoparticles have been expounded. Finally, challenges and future directions on the use of biological capping agents have been concluded. The goal of the present review article is to provide a comprehensive report to researchers who are looking for alternative biological capping agents for the green synthesis of important metallic nanoparticles.

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Section: Bacterial Extract As a Capping Agentmentioning

confidence: 99%

Role of Biogenic Capping Agents in the Synthesis of Metallic Nanoparticles and Evaluation of Their Therapeutic Potential

Sidhu

Verma

Kaushal

2022

Front. Nanotechnol.

135

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“…It indicated the electrostatic field strength around the rhamnolipid molecule decreased in the lower pH. Suspensions with zeta potential values lower than ± 20 mV are considered unstable and indicate a low rhamnolipid aggregation capacity due to the equilibrium of the charges 68 . An increase of the pH value of the rhamnolipid solution could promote the ionization of the carboxy and hydroxy portion in the solution.…”

Section: Results Analysesmentioning

confidence: 99%

Improved remediation of co-contaminated soils by heavy metals and PAHs with biosurfactant-enhanced soil washing

Zhang

Wang

et al. 2022

Sci Rep

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Due to the huge toxicity of co-contaminated soil with PAHs and heavy metals and the complexity of their remediation, it is thus critical to take effective remediation actions to remove heavy metals and PAHs simultaneously from the co-contaminated soil. Biosurfactant-enhanced soil washing (BESW) were investigated in this study for remediation of soil co-contaminated with phenanthrene (PHE) and cadmium (Cd). The co-existence of PHE and Cd caused the change of the structure of soil and rhamnolipid micelle, which lead to different removal rate of PHE and Cd from co-contaminated soil compared with single contaminated soil. The results of FT-IR and NMR showed that PHE entered micelles of rhamnolipid and Cd formed the complexation with the external carboxyl groups of rhamnolipid micelle. We also found that pH, concentration of rhamnolipid solution, temperature and ionic strength had influence on co-contaminated soil remediation. The effects of above mentioned four factors on co-contaminated soil remediation in BESW processes were analyzed by using Taguchi design of experiment method. Taguchi based Grey Relational Analysis was conducted to identify the optimal remediation conditions, which included pH = 9, concentration of rhamnolipid = 5 g/L, temperature = 15 °C and ionic strength = 0.01 M. Under the optimal conditions for BESW, removal rates of cadmium and phenanthrene reached 72.4% and 87.8%, respectively in co-contaminated soil.

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“…Significant interest has been generated in applications of RL as dispersants for BaTiO 3 [ 35 ], alumina [ 36 , 37 ], zirconia [ 38 ], and hematite [ 39 ] particles in aqueous suspensions. RL were used as capping agents for synthesis of ZnS [ 40 ], NiO [ 41 ], and Ag [ 42 ] nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Processing of Mn3O4-Carbon Nanotube Nanocomposite Electrodes for Supercapacitors

Zhitomirsky

2022

Nanomaterials

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This investigation addresses the challenges in the development of efficient nanostructured Mn3O4 cathodes for supercapacitors. A high areal capacitance and the ability to avoid a time-consuming activation procedure for electrodes with high active mass loading of 40 mg cm−2 are reported. This facilitates practical applications of Mn3O4 based electrodes. The highest capacitance of 6.11 F cm−2 (153 F g−1) is obtained from cyclic voltammetry at a scan rate of 2 mV s−1 and 6.07 F cm−2 (151.9 F g−1) from the chronopotentiometry at a current density of 3 mA cm−2 in a potential window of 0.9 V in a neutral Na2SO4 electrolyte. The new approach is based on the application of rhamnolipids (RL) as a capping agent for the synthesis of Mn3O4 particles and a co-dispersant for Mn3O4 and carbon nanotubes, which are used as conductive additives. The size and shape of the Mn3O4 particles are influenced by RL. The enhanced performance of the electrodes is linked to the chemical structure and properties of RL molecules, which exert influence on Mn3O4 particle size and shape during synthesis, reduce agglomeration, facilitate RL adsorption on Mn3O4 and carbon nanotubes, and influence their co-dispersion and mixing at the nanometric scale.

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Silver nanoparticles stabilized by ramnolipids: Effect of pH

Cited by 23 publications

References 52 publications

Role of Biogenic Capping Agents in the Synthesis of Metallic Nanoparticles and Evaluation of Their Therapeutic Potential

Role of Biogenic Capping Agents in the Synthesis of Metallic Nanoparticles and Evaluation of Their Therapeutic Potential

Improved remediation of co-contaminated soils by heavy metals and PAHs with biosurfactant-enhanced soil washing

Colloidal Processing of Mn3O4-Carbon Nanotube Nanocomposite Electrodes for Supercapacitors

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