Antimicrobial Activity of Silver Nanoparticles Synthesis by Green Method from Artemisia Monosperma

Introduction

From very dangerous Gram negative bacteria Pesudomonas aeruginosa cause infection due to longer stay in hospital and it is resistance to many antimicrobial because it have ability to survive under drastic condition, Pesudomonas aeruginosa is most suitable known agent used for study control for nosocomial hospital infection  [1,2].

Among great health challenge antimicrobial of green synthesis of nanoparticles from natural source, [3] the high ratio of volume to surface and its chemical and physical properties of nanoparticles  have important role of excellent antimicrobial activity, [4]  silver nanoparticles are characteristic with good antibacterial, antifungal and antiviral [5,6].

The synthesis of silver nanoparticles by green method is preferred due to less expensive and and could suitable for large scale of synthesis nanoparticles. Many plant extract can use for synthesis nanoparticale as posses many antioxidant which act as reducing agent Plant extracts possess many antioxidants, which act as reducing agents [7].

Genus Artemisia family asteraceae, comprises about 300 species distributed over all world the genus represented by five species in northern region Saudi Arabia (A. monosperma, A. scoparia, A. judica and A. sibri).  A. monosperma is green shrub let  50-70-cm high, flowering from spring season  and extended to September [8].

Secondary metabolite  of Artemisia species and essential oil are widely medicinally used  for many year. Studied was aimed to use the medicinal plant Artemisia monosperma for green synthesis of nanoparticle and study the antimicrobial activity of synthesis nanoparticles against gram positive and gram- negative bacteria.

Material and Methods

Plant Material

Fresh plant Artemisia monosperma were collected in spring 2017 year from Tabok, North region in Saudi Arabia, and identified in Biology department, faculty of science, Northern Border University, the sample were kept in Herbarium of faculty of science girl section.

Preparation of Plant Extract

10 gram of powdered plant sample (Aerial part) of Artemisia monosperma  was boiling with 100 ml deionized water for 15 min, then filtered and complete the filtrate to 100 ml deionized water and kept at 0°C for synthesis nanoparticles .

Synthesis of silver nanoparticles AgNPs

Synthesis of the AgNPs, take 0.2, 0. 4, 0.6, 0.8, 0.5, 1.0 and 1.5 ml of plant extract and added to the 5 ml,  (10^-3 M) AgNO₃ to each of them the volume was adjusted to 10 ml by de-ionized water. Final concentration of Ag⁺ was 1×10^-4 M, the Ag⁺ ion was reduced to Ag⁰ and color of the solution changed from yellow, brownish-yellow to dark brown,  within 2 hours at room temp 37°C and neutral pH condition.

Characterization of Silver Nanoparticles Synthesis

The characterization and confirmation of AgNPs synthesis was conducted at Advanced Materials and Nano scale Research Laboratory, Ain shams university by UV-Vis Spectrophotometer  UV–vis spectral analysis was conducted using a Perkin Elmer-Lambda 950– UV-visible spectrometer. UV–vis spectra of AgNPs and Ag ions were recorded in range from 300 to 500 nm. [ 9].

TEM Analysis of AgNPs

Transmission Electron microscopy (TEM) was used to examine the size and morphology of synthesis nanoparticles, the image was done on a JEOL-1200 JEM for the TEM measurements.

Infrared Spectrometry Spectra

Infrared spectroscopy were measured on a perkin-Elemer 1000 fourier transforms inferared spectrometer, silver nanoparticles was centrifuge at 16.330 recf for 20 minutes and dried, then mixed with KBr powder  for measurement.

Analysis of plant Extract by GC-MS

The constituents of the aqueous extract analyzed by GC-MS as described by  Elsharkawy and shiboop 2018, [10]. Compounds identified by comparison of their retention indices (RI), (C9 to C24 n-alkane mixture) and mass spectra with those reported in the literature [10].

Antimicrobial Activity Assay

Antimicrobial activity assay of the synthesized AgNps, nanoparticles  was studied against the growth of Gram Positive bacteria (Bacillus subtitles ATCC 6633, Staphylococcus aureus ATCC 25923), Gram negative bacteria (E. coli ATCC 25922, and Pseudomonas aeruginosa ATCC 27858) and Fungi (Candida albicans ATCC 10231) in comparison with that of aqueous Artemisia monosperma extract by using the standard agar well diffusion technique. as method described by Abdallah et al., 2016 [11].

Results and Discussion

The plant  Artemisia monosperma was used,  to synthesis nanoparticle under facial condition gust by addition of  aqueous plant extract to  5 ml of  aqueous solution AgNO₃, at different concentration from 0.2 ml to 1.5 ml of aqueous extract, the solution color change gradually from yellow, brownish-yellow to dark brown gust after 2 hours at a normal condition of temperature 37°C and neutral ph, as shown in fig 2, indicated the preliminary formation of nanoparticle. The formation of AgNPs was monitored  by UV-Viable spectrophotometer, where silver nanoparticles characteristic by absorption under viable range 300-500 [9].

Figure 1: Picture of plant Artemisia monosperma Click here to View figure

 

UV-Visible

To confirm the formation and stability of synthesis nanoparticle  were assayed by UV-Viable spectrophotometer, figure 3 shows the UV-Viable spectra of AgNPs formed at  constant concentration of  AgNO₃ (10^-3M). The spectra shows the  change of color of AgNPs with changing the plant extract concentration. As is clear from the inset in figure 3 a the color changed from pale yellow  to dark brown  depending on the extract concentration. As shown in figure 2, UV –vis spectra showed that in the range of low amounts of the leaf extract (0.2–1.5 ml in 10 ml solution), the absorption spectra exhibit a gradual increase of the absorbance accompanied with a shift in the λ max of SPR band absorption peak from 450 to 478 nm. Further increasing the concentration of plant extract with constant amount of AgNO₃, the λ_max was shifted to longer wavelengths.  The  inset UV-vis spectrum was related to the Ag ions before the bio-reduction event, in which an absorption band appeared at 290 nm.The appearance of the above SPR peak at 460 nm, along with absence of 290 nm absorption band indicate of the successful synthesis of AgNPs under experimental conditions. Such a characteristic SPR peak for AgNPs has been reported to predominantly appear in the range of 300-500 nm [12].

Figure 2: Color change of Ag NPs synthesis from Artemisia monosperma Click here to View figure

 

Figure 3: UV –Vis spectra of AgNPs  using different concentration of Plant Extract. Click here to View figure

 

FT IR Spectrum

FTIR spectrum was used to identify the possible function groups of biomolecules in the plant extract that might be responsible for bioreduction and coating of AgNPs,. The spectrum of the FTIR spectra of plant extract showed a broad band at 3408 cm^-1. This band attributed to the OH groups in the biomolecules. The IR bands at 2920 and 2852 cm^-1 due to C–H stretching vibration modes in hydrocarbon chains. The IR bands at 1181 and 1725 cm^-1were characterized as C–O and C=O stretching   of the carbonyl functional group. The stronger band at 1642 cm^-1was characterized as C=O of the amide groups of protein, 1516cm⁻¹ due to stretching vibrations of –C–C– in aromatic rings. In the case of Ag NPs, a large shift in the absorbance peak with decreased band intensity was observed from 3408.4  to 3404.7 cm⁻¹ and 1382.2  to 1320 cm⁻¹ . The spectra also illustrate a prominent shift in the wave numbers corresponding to amide (1652.5–1600 cm⁻¹), indicate the presence of free amino group which may be interacted with AgNPs surface maintain the stability of nanoparticles. the IR spectrum, at fig 4,  indicating the capping of the nanoparticles with the extract constituents.

Figure 4: IR Spectra of  silver nanoparticles AgNPs Click here to View figure

 

TEM Analysis of AgNPs

The formation of nanopaerticles was confirmed by TEM (Transsimision electron microscopy), the image of TEM of silver NPs depicted in figure 3, indicate the shape, morphology and size of synthesis AgNPs, the size was in the range of 13- 18 nm, and the shape was spherical and irregular.

Figure 5: TEM image of AgNPs synthesis from plant Artemisia monosperma Click here to View figure

 

Antimicrobial Activity

The results of the antibacterial evaluation are presented in table 1. In general, silver Nanopartocles synthesis from Artemisia monosperma aqueous extract showed higher  antibacterial against both of gram positive and gram negative than plant aqueous extract.

The mean zone of inhibition of Artemisia monosperma ranged between 2.5.0±0.0 to 3.5±0.5mm, for Gram-positives, and 1.5±0.5 to 2.0±1.0 for Gram-negatives for aqueous extract which is week as compared with nanoparticles which shows the mean inhibition zone ranged between 7.0±0.5 to 8.0 ±0.0 for gram negative, among all tested bacteria the most susceptible bacteria was pseudomonas aeruginosa.  Elshsharkawy et al.,  [14]. reported that Mean zone of inhibition of  the essential oils of Artemisia monosperma ranged between 20.5±0.0 to 23.0±0.5 mm, for Gram-positives, and 16.5±0.5 to 10.0±1.0 for Gram-negatives. The most susceptible bacteria was Satphylococcus aureus.  The antimicrobial activity of silver is well known. In its nanometric form, this characteristic is accentuated. Due to their size, AgNPs can enter cells and inhibit enzymatic systems in the respiratory chain of some bacteria and thereby alter their DNA synthesis

The solubility of NPs in aqueous medium was enhance antibacterial activity  where the a plant aqueous extract show moderate antibacterial activity . The antimicrobial activity of the prepared nanoparticles were studied and the activity was found to depend on the concentration of nanoparticles and their sizes. Other studies confirm our result and recommended by use AgNPs  as alternative control of microorganism with less risk of toxicity to mammalian cells [15].

Table 1: Antimicrobial  activity of  the tested plant’s against some microorganism

Tested compound	Mean zone of inhibition (mm)
	G- bacteria		G+ bacteria		Fungi
	bacillus subtilis	Staphylococcus aureus	Pesudomonasaeruginosa	Echerichia coli	Candida albicans
Ag NPs	8.0 ±0.0	7.0±0.5	8.5±1.5	8.0±0.5	0
Aqueous plant extract	1.5±0.5	2.0±1.0	3.5±0.5	2.5±0.5	0
Erythromycin (15 µg/disc)	6.0±0.0	18.0±1.0	7.5±0.5	6.0±0.0	2.2±0.0

 

Phytochemical Analysis

Preliminary phytochemical analysis of aqueous extract showed the plant contain more active constituents, flavonoid, terpene, steroid ,coumarin and alkaloid compound, so further analysis of extract was studied to investigate and identified on the chemical compounds in the plant which responsible on antimicrobial activity, aqueous extract was fractionated between methanol and water, methanol fraction was analysis by GC-MS and illustrated  the presence of 13 compounds shown in table 2, while water fraction show the presence of protein and glucoside. [16].

Table 2: compounds identified by GC-MS from methanol fraction

compounds	RI	RRI	%
Dasycarpidan-methanol, acetate	650	671	0.05
Verbenol	812	813	7.54
Azafrin	501	514	0.05
Olean1-2-ene-3,15,16,21,22,28-hexol	439	472	0.02
Ursodeoxycholic acid	439	472	0.55
Nerolidyl acetate	807	819	0.50
Xanthoxylin	854	860	3.95
Methyl jasmonate	857	871	0.64
Aspidospermidin-17-ol	652	675	0.02
psi.,.psi.Carotene,	433	436	0.04
Pterin -6-carboxylic acid	669	695	0.07
5,4′-dihydroxy-3,7-dimethoxyflavone (Kumatakenin)	651	666	2.7

 

Figure 6: Structure of compounds of Methanol Extract of Artemisia monosperma identified by GC-MS Click here to View figure

 

Conclusion

This work presented synthesis consisting of a reduction of the silver ions using a Artemisia monosperma extract for the first time. The silver, nanoparticles synthesis were confirmed using different techniques. In present study, antimicrobial of synthesized AgNPs by green methods from aqueous extract of plant A. monosperma, as well as plant extract alone were assayed against gram positive,  gram negative bacteria and Candida albicans, the results indicate the higher activity against gram positive and negative bacteria of synthesis AgNPs  than aqueous plant extract, where the solution acting as capping ligand. GC-MS of plant extract shown many important flavonoid (Kumatakenin), alkaloid (Aspidospermidin-17-ol) and other organic compounds(methyl-jasmonate and verbenol). The results support the importance of further study  to confirm our result to use these AgNPs as antibiotic and investigate the combination of silver nanoarticles with antibiotic against resistance.

Acknowledgments

The author gratefully acknowledgment the approval and support of this research by the grant no: SCI-2017-1-7-F-7157 from the deanship of Scientific Research of Northern Border University, Arar, Saudi Arabia

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