Abstract

• In Myanmar, the natural pirulina is produced from the natural lake of Yae Khar lake. The aim of this research was to prepare silver nanoparticles from pirulina platensis and to study its utilizations in biomedical, waste water treatment and some lotions for cosmetic products. Microalgae are microscopic photosynthesis organisms that are found in both marine and fresh environments. pirulina platensis (blue green algae) plays very important role for health food. Silver nanoparticles were prepared by green synthesis of silver nitrate with spirulina at 50C for 3 h and characterized by RD, SEM, AFM, UV visible spectrophotometer and FTIR techniques. Average crystallite size of silver nanoparticles from spirulina were found to be 23.93 nm by using Debye-Scherrer equation. The antimicrobial activity of silver nanoparticles against both gram positive bacteria (acillus subtilis, acillus pumilus, taphylococcus aureus and gram negative bacteria Escherichia coli and Pseudomonas aeruginosa and Candida albicans a fungus strain was done by agar well diffusion method. Among these strains, silver nanoparticles from pirulina platensis on Escherichia coli and Candida albicans showed the highest antimicrobial activity. Silver nanoparticles were applied for the removal of textile dyes in waste water samples. Utilizations of pirulina platensis and silver nanoparticles were performed for the formulation of face cream and body lotion and their sun protection factors (SPF) were observed to be 11.34 and 8.57. It was observed that these products can be used safely for face cream and body lotion because of the pH value and their characteristics of microbiological parameters (total plate count and yeast and mold count) for the cosmetic products compared with commercial products.