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Green synthesis and characterization of gelatin-based and sugar-reduced silver nanoparticles.

Darroudi M, Ahmad MB, Abdullah AH, Ibrahim NA - Int J Nanomedicine (2011)

Bottom Line: In this study, gelatin was used for the first time as a reducing and stabilizing agent.It was found that with increasing temperature the size of nanoparticles is decreased.It was found that the particle size of Ag-NPs obtained in gelatin solutions is smaller than in gelatin-glucose solutions, which can be related to the rate of reduction reaction.

View Article: PubMed Central - PubMed

Affiliation: Advanced Materials and Nanotechnology Laboratory, Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, Selangor, Malaysia. majiddarroudi@gmail.com

ABSTRACT
Silver nanoparticles (Ag-NPs) have been successfully prepared with simple and "green" synthesis method by reducing Ag(+) ions in aqueous gelatin media with and in the absence of glucose as a reducing agent. In this study, gelatin was used for the first time as a reducing and stabilizing agent. The effect of temperature on particle size of Ag-NPs was also studied. It was found that with increasing temperature the size of nanoparticles is decreased. It was found that the particle size of Ag-NPs obtained in gelatin solutions is smaller than in gelatin-glucose solutions, which can be related to the rate of reduction reaction. X-ray diffraction, ultraviolet-visible spectra, transmission electron microscopy, and atomic force microscopy revealed the formation of monodispersed Ag-NPs with a narrow particle size distribution.

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Transmission electron microscopy images and corresponding size distributions of AGG60 (A) and AG60 (B).
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f2-ijn-6-569: Transmission electron microscopy images and corresponding size distributions of AGG60 (A) and AG60 (B).

Mentions: After reaction at 28°C, the Ag-NPs obtained showed a characteristic SPR band for Ag-NPs centered at about 445 nm and 438 nm for AG28 and AGG28, respectively (Figure 1A, D). As shown in Figure 1, the intensity of all the SPR peaks increased as the reaction temperature increased, which indicates the continued reduction of the silver ions, and the increase of the absorbance with the reaction temperature indicates that the concentration of Ag-NPs increased.20,21 When the reaction temperatures reached 40°C (Figure 1B,E), the absorbance intensities were increased, and the λmax values were slightly blue-shifted to 443 nm and 431 nm for AG40 and AGG40, respectively. For AG60 and AGG60 (Figure 1C,F), the absorbance intensities was also increased and blue-shifted to 425 nm and 430 nm, respectively. This phenomenon indicated that the size of particles was decreased, because the absorbance peak due to the SPR of metallic nanoparticles shows the blue-shift with decreasing particle size.22 The Ag-NPs could dissociate due to heating to form smaller particles stabilized by the amine pendant groups on the gelatin, which leads to the formation of gelatin-stabilized stable Ag-NPs.23 Figure 2 shows typical TEM images and the corresponding particle size distribution of the prepared Ag-NPs at different reaction media. The TEM results indicate that the samples obtained in gelatin and gelatin–glucose solutions retained a narrower particle size distribution. It was found that the particle size of Ag-NPs obtained in gelatin solutions is smaller than in the gelatin-glucose solutions, which can be related to rate of reduction reaction. The average size of all prepared Ag-NPs was less than 15 nm, and a smaller average size (about 3.7 nm) was obtained for AG60.


Green synthesis and characterization of gelatin-based and sugar-reduced silver nanoparticles.

Darroudi M, Ahmad MB, Abdullah AH, Ibrahim NA - Int J Nanomedicine (2011)

Transmission electron microscopy images and corresponding size distributions of AGG60 (A) and AG60 (B).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3107715&req=5

f2-ijn-6-569: Transmission electron microscopy images and corresponding size distributions of AGG60 (A) and AG60 (B).
Mentions: After reaction at 28°C, the Ag-NPs obtained showed a characteristic SPR band for Ag-NPs centered at about 445 nm and 438 nm for AG28 and AGG28, respectively (Figure 1A, D). As shown in Figure 1, the intensity of all the SPR peaks increased as the reaction temperature increased, which indicates the continued reduction of the silver ions, and the increase of the absorbance with the reaction temperature indicates that the concentration of Ag-NPs increased.20,21 When the reaction temperatures reached 40°C (Figure 1B,E), the absorbance intensities were increased, and the λmax values were slightly blue-shifted to 443 nm and 431 nm for AG40 and AGG40, respectively. For AG60 and AGG60 (Figure 1C,F), the absorbance intensities was also increased and blue-shifted to 425 nm and 430 nm, respectively. This phenomenon indicated that the size of particles was decreased, because the absorbance peak due to the SPR of metallic nanoparticles shows the blue-shift with decreasing particle size.22 The Ag-NPs could dissociate due to heating to form smaller particles stabilized by the amine pendant groups on the gelatin, which leads to the formation of gelatin-stabilized stable Ag-NPs.23 Figure 2 shows typical TEM images and the corresponding particle size distribution of the prepared Ag-NPs at different reaction media. The TEM results indicate that the samples obtained in gelatin and gelatin–glucose solutions retained a narrower particle size distribution. It was found that the particle size of Ag-NPs obtained in gelatin solutions is smaller than in the gelatin-glucose solutions, which can be related to rate of reduction reaction. The average size of all prepared Ag-NPs was less than 15 nm, and a smaller average size (about 3.7 nm) was obtained for AG60.

Bottom Line: In this study, gelatin was used for the first time as a reducing and stabilizing agent.It was found that with increasing temperature the size of nanoparticles is decreased.It was found that the particle size of Ag-NPs obtained in gelatin solutions is smaller than in gelatin-glucose solutions, which can be related to the rate of reduction reaction.

View Article: PubMed Central - PubMed

Affiliation: Advanced Materials and Nanotechnology Laboratory, Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, Selangor, Malaysia. majiddarroudi@gmail.com

ABSTRACT
Silver nanoparticles (Ag-NPs) have been successfully prepared with simple and "green" synthesis method by reducing Ag(+) ions in aqueous gelatin media with and in the absence of glucose as a reducing agent. In this study, gelatin was used for the first time as a reducing and stabilizing agent. The effect of temperature on particle size of Ag-NPs was also studied. It was found that with increasing temperature the size of nanoparticles is decreased. It was found that the particle size of Ag-NPs obtained in gelatin solutions is smaller than in gelatin-glucose solutions, which can be related to the rate of reduction reaction. X-ray diffraction, ultraviolet-visible spectra, transmission electron microscopy, and atomic force microscopy revealed the formation of monodispersed Ag-NPs with a narrow particle size distribution.

Show MeSH
Related in: MedlinePlus