Preparation and characterization of TiO2 photocatalyst films and their application for preservation of Agaricus bisporus in combination with blue-violet LEDs.

This study aims to prepare and characterize non-metallic nitrogen-modified titanium dioxide (N –TiO 2), film and expand its photocatalytic excitation wavelength to the visible blue-violet region. The film uses corn starch as a carrier. It is combined with blue-violet LED light to explore the effect of this combination on the quality of Agaricus bisporus during storage. This study found that the mechanical properties and hydrophobicity of the corn starch film with nano-TiO 2 added were improved; the effect of adding N –TiO 2 was more pronounced; the tensile strength increased by 65% while the water contact angle increased by 11%. In the application of A. bisporus storage, the film combined with blue-violet LED light can slow down the loss of moisture, reduce the respiratory rate, delay the appearance of the respiratory peak, and maintain the color and hardness of A. bisporus. After 15 d of storage, compared to the control group, the hardness decreased by 69%, browning index (BI) increased by 221%, the C S-N group hardness decreased by only 23%, and the BI increased by 89%. Under blue-violet LED light, the accumulation of secondary metabolites in A. bisporus increased, and the polyphenol content also showed an increasing trend during storage. • Nitrogen-modified TiO 2 can extend its photocatalytic excitation wavelength into the visible blue-violet region. • Addition of TiO 2 nanoparticles improves the mechanical and hydrophobic properties of corn starch films. • The new treatment effectively retarded the decline in hardness and color change of Agaricus bisporus. • Blue-violet LEDs promote the accumulation of secondary metabolites in Agaricus bisporus. [ABSTRACT FROM AUTHOR]