Synthesis, characterization and antimicrobial activity of dextran stabilized silver nanoparticles in aqueous medium

Bankura, Kalipada; Maity, Dipanwita; Mollick, Md. Masud Rahaman; Mondal, Dibyendu; Bhowmick, Biplab; Bain, Mrinal Kanti; Chakraborty, Anirban; Sarkar, Joy; Acharya, Krishnendu; Chattopadhyay, Dipankar

doi:10.1016/j.carbpol.2012.03.089

Cited by 237 publications

(110 citation statements)

References 56 publications

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“…This two extracts gave symmetric and narrow SPR bands with the highest values of absorbance. Depending on the SPR bands shape it is possible to assume uniformity of the AgNPs shape and size [23,24]. Small spherical nanoparticles exhibit a single, symmetrical SPR band, whereas large and/or different shaped particles reveal two or three peaks.…”

Section: Resultsmentioning

confidence: 99%

Limitations and possibilities of green synthesis and long-term stability of colloidal Ag nanoparticles

Velgosová

Mražíková

2017

AIP Conference Proceedings

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Abstract. In this paper the influence of algae life cycle and the solutions pH on the green synthesis of colloidal Ag nanoparticles (AgNPs) as well as effect of different storage conditions on AgNPs long-term stability was investigated. Silver nanoparticles were biologically synthesized using extracts of Parachlorella kessleri algae cultivated 1, 2, 3 and 4 weeks. The formation of AgNPs was monitored using a UV-vis spectrophotometer and verified by TEM observation. The results confirmed formation of polyhedron and/or near polyhedron AgNPs, ranging between 5 and 60 nm in diameter. The age of algae influenced the synthesis rate and an amount of AgNPs in solution. The best results were obtained using tree weeks old algae. UV-vis analysis and TEM observation also revealed that the size and the stability of AgNPs depend on the pH of solution. AgNPs formed in solutions of higher pH (8 and 10) are polyhedron, fine, with narrow size interval and stabile. Nanoparticles formed in solutions of low pH (2, 4 and 6) started to lose their stability on 10 th day of experiment, and the particle size interval was wide. The long-term stability of AgNPs can be influenced by light and temperature conditions. The most significant stability loss was observed at day light and room temperature (21°C). After 200-days significant amount of agglomerated particles settled on the bottom of the Erlenmeyer flask. AgNPs stored at dark and room temperature showed better long-term stability, weak particles agglomeration was observed. AgNPs stored at dark and at temperature 5°C showed the best long-term stability. Such AgNPs remained spherical, fine (5-20 nm), with narrow size interval and stable (no agglomeration) even after more than six months.

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Section: Resultsmentioning

confidence: 99%

Limitations and possibilities of green synthesis and long-term stability of colloidal Ag nanoparticles

Velgosová

Mražíková

2017

AIP Conference Proceedings

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“…Solution colour is the result of the radiation absorption in the visible region of the electromagnetic spectrum (380-450 nm) due to the localised surface plasmon of silver nanoparticles [12].…”

Section: Resultsmentioning

confidence: 99%

Control over the Biological Synthesis of Ag Nanoparticles by Selection of the Specific Algal Species

Sedláková-Kaduková¹,

Velgosová

Vosátka

et al. 2017

Archives of Metallurgy and Materials

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The application of green synthesis in the nano-science and technology is of great importance in the area of the preparation of various materials. In this work, three selected algal species Parachlorella kessleri, Dictyosphaerium chlorelloides and Desmodesmus quadricauda were successfully used for the preparation of silver nanoparticles (AgNPs). Presence of AgNPs was confirmed by UV-vis spectroscopy and transmission electron microscopy. AgNPs produced by P. kessleri had narrow size distribution and average sizes of 7.6 nm. However, nanoparticle production lasted for long time. Nanoparticle formation by D. chlorelloides was the fastest, although, their average sizes were 23.4 nm with broad size distribution. Nanoparticles produced by D. quadricauda had average sizes 23.9 nm but they were the least stable, aggregated and precipitated from solutions within 3 days. These results confirmed that the size distribution and mean diameter of the nanoparticles, crucial for various applications, can be controlled by the organism selection.

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“…The formation of nanoparticles was confirmed by UV-vis spectroscopy. Typical spectrum is the result of the radiation absorption in the visible region of the electromagnetic spectrum due to the localised surface plasmon of silver nanoparticles (DUBAS and PIMPAN, 2008;BANKURA et al, 2012). The surface plasmon resonance (SPR) bands in absorption spectrum with the peak at app.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Culture Age and Initial Silver Concentration on Biosynthesis of Ag Nanoparticles

Kaduková¹,

Velgosová²,

Mražíková³

et al. 2014

Nova Biotechnologica Et Chimica

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Abstract:Many organisms or their extracts have the ability to reduce Ag + ions to Ag 0 and stabilize them what results in nanoparticle formation in solution. The aim of the article was to study the influence of two selected parameters -initial silver concentration and culture age, on Ag nanoparticles production by green algae Parachlorella kessleri. The presence of Ag nanoparticles in the solution was confirmed by the UV-vis spectroscopy and TEM analyses. Typical curve with the peak at app. 420 nm was found for nanoparticles produced by algae. While culture age did not have any significant effect, the initial silver concentration had significant influence on nanoparticle production which influenced the rate of nanoparticle production, their amount, their size and stability, as well.

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Synthesis, characterization and antimicrobial activity of dextran stabilized silver nanoparticles in aqueous medium

Cited by 237 publications

References 56 publications

Limitations and possibilities of green synthesis and long-term stability of colloidal Ag nanoparticles

Limitations and possibilities of green synthesis and long-term stability of colloidal Ag nanoparticles

Control over the Biological Synthesis of Ag Nanoparticles by Selection of the Specific Algal Species

The Effect of Culture Age and Initial Silver Concentration on Biosynthesis of Ag Nanoparticles

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