Green Synthesis of Plant-Mediated Metal Nanoparticles: The Role of Polyphenols

Ms, Latif; Abbas, Sameera; Kormin, Faridah; Mk, Mustafa

doi:10.22159/ajpcr.2019.v12i7.33211

Cited by 45 publications

(23 citation statements)

References 102 publications

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“…Given the predominance of polyphenols like flavonoids and xanthones in fresh coconut inflorescence sap, it could be assumed that these compounds could be mainly involved in synthesis of NPs. Many studies have reported the role of polyphenols in the promotion of green synthesis of metal NPs (Tao et al, 2016;Jigaysa and Rajput, 2018;Singh et al, 2019;Latif et al, 2019).…”

Section: Metabolomic Profiling Of Coconut Inflorescence Sapmentioning

confidence: 99%

Coconut inflorescence sap mediated synthesis of silver nanoparticles and its diverse antimicrobial properties

Rajesh

Muralikrishna

Nair

et al. 2019

Preprint

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Green synthesis of nanoparticles (NPs) involves the use of diverse extracts of biological origin as substrates to synthesize nanoparticles and can overcome the hazards associated with chemical 2 methods. Coconut inflorescence sap, which is unfermented phloem sap obtained by tapping of coconut inflorescence, is a rich source of sugars and secondary metabolites. In this study, coconut inflorescence sap was used to synthesize silver nanoparticles (AgNPs). We have initially undertaken metabolomic profiling of coconut inflorescence sap from West Coast Tall cultivar to delineate its individual components. Secondary metabolites constituted the major portion of the inflorescence sap along with sugars, lipids and, peptides. The concentration of silver nitrate, inflorescence sap and incubation temperature for synthesis of AgNPs were optimized. Incubating the reaction mixture at 40ºC was found to enhance AgNP synthesis. The AgNPs synthesized were characterized using UV-Visible spectrophotometry, X-Ray Diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM). Antimicrobial property of AgNP was tested in tissue culture of arecanut (Areca catechu L.) where bacterial contamination (Bacillus pumilus) was a frequent occurrence. Significant reduction in the contamination was observed when plantlets were treated with aqueous solutions of 0.01, 0.02 and 0.03% of AgNPs for one hour. Notably, treatment with AgNPs did not affect growth and development of the arecanut plantlets. Cytotoxicity of AgNPs was quantified in HeLa cells. Viability (%) of HeLa cells declined significantly at 10 ppm concentration of AgNP and complete mortality was observed at 60 ppm. Antimicrobial properties of AgNPs synthesized from inflorescence sap were also evaluated and confirmed in human pathogenic bacteria viz., Salmonella sp., Vibrio parahaemolyticus, and Escherichia coli. The study concludes that unfermented inflorescence sap, with above neutral pH, serves as an excellent reducing agent to synthesize AgNPs from Ag+.3

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Section: Metabolomic Profiling Of Coconut Inflorescence Sapmentioning

confidence: 99%

Coconut inflorescence sap mediated synthesis of silver nanoparticles and its diverse antimicrobial properties

Rajesh

Muralikrishna

Nair

et al. 2019

Preprint

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“…The sharp band at 2973 cm -1 and 2881 cm -1 represent the stretching of the C-H bond. The band at 1046 cm -1 may be considered as the -C-O group of the polyphenols such as flavones, polysaccharides and terpenoids [34][35][36]. The FTIR spectra after reduction of turmeric crude extract showed peak at 3334 cm -1 belongs to the -OH group which, in this case, can be attributed to the phenolic compounds of turmeric extract.…”

Section: Resultsmentioning

confidence: 88%

Green Synthesis and Characterization of Gold Nanoparticles using Ethanolic Turmeric Crude Extract At Neutral Ph

Abbas,

Latif,

Muhamad

et al. 2020

IJRTE

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There is a great interest in the development of green protocols to avoid environmental and health hazards. In this research, the eco-friendly and cost-effective synthesis of gold nanoparticles (GNPs) has been achieved by the green method using ethanolic turmeric crude extract at pH 7. The bioac-tive compounds of turmeric crude extract are responsible for the reduction, capping and sta-bility of the GNPs. The characterization of GNPs was carried out by ultraviolet-visible (UV-vis) spectroscopy, Fourier transforms infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX) spectroscopy. The UV-vis spectral study indicated the formation of GNPs with a surface plasmon resonance (SPR) band at 547 nm. FTIR analysis of turmeric crude extract and GNPs showed that phenolic groups reduced the gold ions. The FESEM analysis showed the polydisperse morphology of GNPs with average size of 26.6 nm±7.4 nm. The elemental composition determined by EDX re-vealed the presence of gold. The synthesized GNPs can be useful in a variety of applications involving medicine, cosmetics, environment and nutraceutical.

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“…asiatica is known to contain a wide variety of phytochemicals, the secondary metabolites, which signifies the tremendous medicinal importance of this ancient herb. It has been reported to contain the phytochemicals including triterpenoids or saponins, volatile and fatty acids, glycosides, flavonoids, alkaloids, and certain vitamins and free amino acids (Jamil et al, 2007;Latif et al, 2019;Orhan, 2012). A concise summary of the important phytochemical constituents of C. asiatica has been presented in Table 2 along with representative examples of each main group of C. asiatica phytochemicals.…”

Section: Phytochemical Constituentsmentioning

confidence: 99%

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2021

Food Res.

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Of many neurodegenerative diseases, Alzheimer's disease (AD) is the most common cause of dementia globally, which is still incurable even after decades of extensive research to find a definite and permanent cure. Accumulation of free radicals and acetylcholine (ACh) deficiency in the brains of Alzheimer's patients are considered as the factors leading to dementia and cognitive problems. This is by mechanisms involving disturbance in the balance between the amount of free radicals and the antioxidant defense system along with cholinergic deficit leading to impaired cholinergic neurotransmission. Currently available anti-AD drug therapy carries only the partial benefit of slowing down the progression of disease besides having various side effects and, hence, there is a developing interest to search for new drugs. Plants have always been of special interest in the field of new drug discovery research by virtue of their enormous biological diversity and tremendous potential of bioactive molecules. Many herbs are known to ameliorate the symptoms related to memory and cognitive disorders. Centella asiatica (L.) Urb. is one of the widely used plants claimed by the traditional system of medicine to have its positive effects on memory and brain functioning. The objective of this review is to present a comprehensive account on C. asiatica by summarizing the research until date related to its medicinal potential with a special focus on antioxidant and anti-acetylcholinesterase (anti-AChE) properties reflecting their potential therapeutic application for the treatment of AD.

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Green Synthesis of Plant-Mediated Metal Nanoparticles: The Role of Polyphenols

Cited by 45 publications

References 102 publications

Coconut inflorescence sap mediated synthesis of silver nanoparticles and its diverse antimicrobial properties

Coconut inflorescence sap mediated synthesis of silver nanoparticles and its diverse antimicrobial properties

Green Synthesis and Characterization of Gold Nanoparticles using Ethanolic Turmeric Crude Extract At Neutral Ph

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