Applications of plant terpenoids in the synthesis of colloidal silver nanoparticles

Parkia speciosa as Reduction Agent in Green Synthesis Silver Nanoparticles

“…The UV‐vis spectrophotometry is used to detect the absorptions peak of AgNPs. The changes of solution colour from yellowish to brownish indicated the reaction was occurred through the oxidation of P. speciosa into terpenoids and other oxido‐reductively labile metabolites (act as reducing agents and reduced Ag + ions to Ag 0 ) ,. The strong absorption peak (465 nm) is in a range of visible region of noble AgNPs showed the potential of AgNPs as photocatalytic materials since the range of visible light is 390–700 nm ( Figure c ).…”

“…Silver nanoparticles (AgNPs) became one of the major preferences in this field and has been widely applied, such as anti‐microbial, biomedical and in water purification . Diverse types of plants extract have been identified to have potential as reducing agent in synthesis AgNPs and have been discussed in detail previously ,,. Typically, silver nitrate (AgNO 3 ) is used as building block for fabrication of all compound and effective at providing large quantity of silver ions .…”

“…The shifting of P. speciosa broad peaks to sharp peaks of AgNPs proved that the impurities was removed by enhancing the chemical interaction between P. speciosa and AgNO 3 through centrifugation similar with earlier study . The FTIR analysis also proved that P. Speciosa has dual function as reduction and capping agents as a proposed mechanism for the formation of stable suspension based on prior study ( Figure b ).…”

“…The changes of solution colour from yellowish to brownish indicated the reaction was occurred through the oxidation of P. speciosa into terpenoids and other oxido-reductively labile metabolites (act as reducing agents and reduced Ag + ions to Ag 0 ). [25,43] The strong absorption peak (465 nm) is in a range of visible region of noble AgNPs [26] showed the potential of AgNPs as photocatalytic materials since the range of visible light is 390-700 nm (Figure 4c). This peak was exhibited due to the surface plasmon resonance (SPR) phenomenon originates from the resonant collective conduction electrons oscillations in metallic nanoparticles, along the transversal direction of the electromagnetic field.…”

“…[23] Diverse types of plants extract have been identified to have potential as reducing agent in synthesis AgNPs and have been discussed in detail previously. [21,24,25] Typically, silver nitrate (AgNO 3 ) is used as building block for fabrication of all compound and effective at providing large quantity of silver ions. [23] However, it has limitation for certain application, besides easily being inactivated by complexation and precipitation.…”