Polyphenolic extracts from pomegranate and watermelon wastes as substrate to fabricate sustainable silver nanoparticles with larvicidal effect against Spodoptera littoralis

Faculty Agriculture Year: 2021
Type of Publication: ZU Hosted Pages:
Authors:
Journal: Saudi Journal of Biological Sciences King Saud University Volume:
Keywords : Polyphenolic extracts from pomegranate , watermelon wastes    
Abstract:
The agricultural wastes adversely affect the environment however, they are rich in polyphenols therefore this study aimed to employ polyphenol-enriched waste extracts for silver nanoparticles synthesis and study the larvicidal activity silver nanoparticles fabricated by pomegranate and watermelon peels extracts (PPAgNPs and WPAgNPs) against all larval instars of Spodoptera littoralis. The polyphenol profile of pomegranate and watermelon peel extracts (PP and WP) and silver nanoparticles was detected by HPLC. The antioxidant activity was estimated by DPPH, and FARP assays and the antimicrobial activity was evaluated by disc assay. The Larvicidal of AgNPs against Egyptian leaf worm was performed by dipping technique. The obtained AgNPs were spherical with size ranged 15-85 nm and capped with proteins and polyphenols. The phenolic compounds in silver nanoparticles increased about extracts; therefore, they have the best performance in antioxidant/reducing activity and inhibit the growth of tested bacteria and yeast. The PPAgNPs from pomegranate was the most effective against the first instar larvae instar (LC50= 68.32 µg/ml), followed by pomegranate extract with (LC50= 2852 µg/ml). The results indicated that obvious increase in polyphenols content in silver nanoparticles enhance their larvicidal effect and increasing mortality of 1st larval of S. littoralis Egyptian leafworms causing additive effect and synergism. We recommend recycling phenolic enriched agricultural wastes in producing green silver nanoparticles to control cotton leafworm that causes economic loses to crops.
   
     
 
       

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