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Bacillus thuringiensis  ( Bt ) were used for biosynthesis of amorphous TiO 2  converted to distinct polymorphs (anatase, rutile, mix) under different temperature conditions. Characterizations of TiO 2  nanoparticles were performed by using X-ray diffraction spectroscopy (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and, energy-dispersive X-ray spectroscopy (EDX) analysis. Stability of five formulations under ultraviolet (UV) radiation with spore viability and mortality test on  Ephestia kuehniella Zeller  larvae were investigated. TiO 2 (mix) showed the highest viabilities of 79.76% after exposure to ultraviolet (UVA385 nm), while viabilities of non-protected spores under these conditions were 41.32%. The mortality of TiO 2 (mix), TiO 2 (anatase), TiO 2 (rutile), TiO 2 (amorphous) and free spore formulations on second-instar larvae of  Ephestia kuehniella  were 73.76%, 71.24%, 57.12%, 51.32%, and 50.32%, respectively on the 10th day of the experiment. The obtained results suggest that TiO 2 (amorphous) does not increase  Bt  resistance, but both phases of TiO 2  nanoparticles synthesized (anatase and rutile) through the  Bacillus thuringiensis  and phase mixture can increase the persistence of  Bt  to the UV light. Furthermore, the combination of both crystalline phases of TiO 2 (mix) has the highest performance in improving the  Bt  resistance.

A novel method for biosynthesis of different polymorphs of TiO2 nanoparticles as a protector for Bacillus thuringiensis from Ultra Violet