Synthesis and Characterization of Eugenia uniflora L. Silver Nanoparticles and L‐Cysteine Sensor Application

Abstract

L-Cysteine (Cys) is a non-essential sulfur-containing amino acid, crucial for protein synthesis, detoxification, and several metabolic functions. Cys is widely used in the agricultural, food, cosmetic, and pharmaceutical industries. So, a suitable sensitive and selective sensing approach is of great interest, and a low-cost sensor would be necessary. This article presents silver nanoparticles (EuAgNPs) synthesized by a green synthesis method using Eugenia uniflora L. extracts and photoreduction. The nanoparticles were characterized by UV/VIS, transmission electron microscopy, high-performance liquid chromatography (HPLC), FTIR, and Zeta potential. With the addition of Cys in the EuAgNPs solution, the terminal thiol part of L-cysteine binds on the surface of nanoparticles through AgÀ S bond. The EuAgNPs and CysAgNPs coexist until flavonoids bound the amino group of Cys, enhancing the red color of solutions. The EuAgNPs provided selectivity to detect Cys among other amino acids, and its detection limit was found to be 3.8 nM. The sensor has the advantages of low-cost synthesis, fast response, high selectivity, and sensitivity.

Solid‐State Synthesis of Liquorice‐Stabilized Copper‐Based Nanoparticles: Structural and Catalytic Studies

“…Many chemical and physical methods have been introduced and developed for the synthesis of nanomaterials with different sizes and specifications according to different applications [1] . However, these methods suffer from some difficulties, which can be summarized as follows: (1) the low yield, (2) the use of expensive and/or toxic chemicals, [2] (3) the need for complex equipment, [3] (4) multiple steps in preparation and separation, and (5) the need for large quantities of solvents [4,5] …”

“…[1] However, these methods suffer from some difficulties, which can be summarized as follows: (1) the low yield, (2) the use of expensive and/or toxic chemicals, [2] (3) the need for complex equipment, [3] (4) multiple steps in preparation and separation, and (5) the need for large quantities of solvents. [4,5] The fundamental idea behind green chemistry is the synthesis of nanomaterials through the use of environmentally benign and renewable resources rather than harsh, harmful, and costly chemicals. [6] In this context, many researchers tended to develop green pathways to prepare nanomaterials by using various types of renewable sources such as algae, [7] yeast, bacteria, [8] fungi, [9] plants, [10] etc.…”