In current research, the synthesis of gold nanoparticles was achieved via reducing of gold ions in aqueous solution with Garcinia mangostana (G. mangostana) peel extract. The optimum concentration of gold (Au) solution, concentration ratio of Au solution and extract, temperature, time and pH, the synthesized AuNPs (G. mangostana-gold nanoparticles) were studied by using UV-Vis, FT-IR, AAS, AFM, SEM and Zitasizer. The absorbance peak is noticed between 535-550 nm via UV-Vis spectroscopic method. The SEM, AFM analysis were proofed the particle as spherical in structure and their size between 15-100nm. Therefore, mechanism of AuNPs synthesis had been suggested. Also, the antibacterial activity was examined using different bacteria as well as free radical scavenging activity was tested using 1, 1-Diphenyl-2-picrylhydrazyl (DPPH). The AuNPs produced through biosynthesized method indicated a much elevated antioxidant activity as compared to peel extract of G. mangostana. Toxicity of the NPs and extract were tested via giving orally dose 50 mg/b.w. to mice. Diagnosis of the data (pathological changes) indicated that the AuNPs was non-toxic. The G. mangostana peel extract and AuNPs synthesized by this extract were converted to a cream and used as a wound healing cream. As a results, the AuNPs exhibited important role in wound healing progression compared to control, which may be attributed to their anti-inflammatory, antibacterial and antioxidant activities. Therefore, this research confirms its important use of AuNPs and can be utilized as promising agents for in the development of new drugs.

Synthesis of nanoparticles using green methods with study of their propertie is one of great researchers' concerns in fields of pharmaceutical and biomedical products. The present paper aiming to use of an eco-friendly route is used for biosynthesis of gold nanoparticles (AuNPs) using C. Papaya seeds as both reducing and stabilizing agent. Study of C. Papaya seed contents showed many compounds which analyzed via qualitative, quantitative and GC-MS analysis. The influence of C. Papaya concentration, contact time and temperature on the reaction rate and shape of AuNPs are confirmedThe biosynthesized NPs are characterize via UV-Vis, AFM and SEM. The AFM and SEM analysis exhibit a size between 40-105nm with average diameter 75.68nm, and spherical in structure. The antioxidant activity and free radical scavenge activity are studied by using TLC and DPPH analysis. The results show that the C. Papaya seeds and AuNPs have potent antioxidant activity; moreover, the total phenolic contents are characterized. The data confirmed that the C. Papaya seed extract was a good bio-reductant way for AuNPs that can be applied as a promising field in different bio-applications.

A B S T R A C TPeppermint leaves (PML) have been explored as an effective and cheap adsorbent for removal of toxic Cr(VI) ions from aqueous solutions using batch system. Adsorption of Cr (VI) ions onto PML was found to be pH dependent and maximum removal of Cr(VI) ions was obtained at pH 2. It was also found that after 180 min of PML contact with chromium solution at the concentration of 0.3846 mmol/L, more than 95% of Cr(VI) ions can be removed. The equilibrium data were fitted with the Langmuir and Freundlich models. The adsorption kinetic data were best fitted with the pseudo-second-order. The activation energy E a of the adsorption process was determined as 23 kJ mol À1 , which may indicate a physisorption process. The Gibbs free energy, enthalpy, and entropy of the process were also determined, and their values revealed that the process is spontaneous and endothermic accompanied with randomness at the solid/solution interface.

In this work, spent red and black tea form leaves were assessed for their ability to doff expel chromium ion from aqueous solutions at various values of PH. Classification adsorption experiments indebted at choice temperature and showed cruise the adsorption of Cr ion decrease more the increase of temperature. In successive lyrics, the adsorption fight is exothermic and the enthalpy is fatal, at long last the unconventional ways and the entropy are positive. The matter copied at equal stat was compared with Langmuir, Freundlich models, and the inference efficiencies for Cr ion higher than 99% and can easily be achieved. It was hinge saunter the brilliant hatch is reform than hyacinthine cause in adsorption of chromium ion.

Nanochemistry is a significant area which involves the synthesis, design, and manipulation of particle structures with dimensions ranging from 1 to 100 nanometres. It is now one of the major concerns of pharmaceutical and biological researchers. The current study discusses recent advances in the use of silver nanoparticles (AgNPs) as a selective sensor for qualitative and colorimetric quantitative detection of mercury ions.   The synthesis of significant noble metal AgNPs is described as a novel, low-cost, quick, and simple method for detecting mercury ions. Due to the seriousness of mercury toxicity to our cells, AgNPs may be successfully employed for the detection of ecologically harmful mercury ions in a wide variety of aqueous practical samples using a colorimetric approach. As a result, as provided in this review with extensive details regarding this analytical approach, it might be utilized to monitor mercury ions via AgNPs in a variety of practical samples.