Sustainable-green synthesis of silver nanoparticles using safflower (Carthamus tinctorius L.) waste extract and its antibacterial activity

Abstract

Silver nanoparticles have high potential for application in food industry, as they have the ability to inhibit a wide range of bacteria of pathogenic and spoilage origin. They can be obtained from different methods classified in physical and chemical and which are aggressive with the environment since they produce toxic waste. Nowadays, environmentally friendly methods such as green synthesis can be used, through the use of agri-food waste. The use of these wastes is a more sustainable method, because it reduces the environmental pollution, at the same time that silver nanoparticles are obtained. The aim of the present study is the green synthesis of silver nanoparticles using safflower (Carthamus tinctorius L.) aqueous extract from waste and its antibacterial activity on Staphylococcus aureus (Gram positive) and Pseudomonas fluorescens (Gram negative). The analyses by TEM showed that the assynthesized silver nanoparticles were uniform and spherical particles with an average diameter of 8.67 AE 4.7 nm and confirmed by SEM. The electron diffraction and TEM analyses showed the characteristic crystallinity of silver nanoparticles. FTIR spectroscopy confirmed that various functional groups were responsible for reducing and stabilizing during the biosynthesis process. Nanoparticles inhibited the growth of both types of bacteria from the lowest concentration evaluated (0.9 μg/mL). We conclude that silver nanoparticles synthesized in the present study have potential application as antibacterial agents in food and medicine industry.

Silver nanoparticles synthesized by the heavy metal resistant strain Amycolatopsis tucumanensis and its application in controlling red strip disease in sugarcane

“…The synthesis of biological AgNPs was achieved after 72 h of incubation by activity of the metabolites released by A. tucumanensis . The change of color into yellowish-brown and the absorbance of the surface plasmon resonance located at 405 nm suggested the green synthesis of AgNPs ( Figure 1 A, B and C) similar to the reported of another authors ( Jalab et al., 2021 ; Rodríguez-Félix et al., 2021 ). In the abiotic control (ISP-2 + AgNO 3 ) neither change of color nor plasmon formation were observed.…”

“…Several mechanisms for the biosynthesis of nanoparticles were proposed ( Jalab et al., 2021 ; Rodríguez-Félix et al., 2021 ; Saravanan et al., 2021 ). In the synthesis of AgNPs, the reduction of Ag + ions is attributed to the combined action of bio-molecules such as proteins, vitamins, lipids, etc, produced by the bacteria.…”

Green Synthesis of Crystalline Silica from Sugarcane Bagasse Ash: Physico-Chemical Properties

“…Bio-inspired methods are emerging as viable options for producing highly valued silver nanoparticles while promoting sustainability. The green synthesis of Ag from agri-food waste extracts and by-products are flexible to manage, cost-effective, and possess potential application in health for antimicrobial and anticancer activity [4][5][6][7].…”

Integrated system for recycling and treatment of hazardous pharmaceutical wastewater

“…The as-synthesized silver nanoparticles were homogenous and spherical, with an average diameter of 8.67 4.7 nm, as determined by TEM and validated by SEM. The unique crystallinity of silver nanoparticles was revealed by electron diffraction and TEM investigations (Rodríguez-Felix et al 2021).…”