Semi-empirical self-consistent field molecular orbital calculation of transition energy and oscillatory strength for the stacked complexes of pyrene and 3,4-benzopyrene with DNA bases

UV-irradiated DNA matrixes selectively bind endocrine disruptors with a planar structure

DNA has unique chemical properties and is readily purified from salmon milts and shellfish gonads. DNA has few commercial uses and is generally discarded as an industrial waste. Recently, we prepared water-insoluble and nuclease-resistant DNA-films by UV irradiation. The DNA-films removed DNA-intercalating compounds. Here, we immobilized double-stranded DNA onto porous glass beads by UV irradiation and prepared DNA-immobilized glass bead columns. The DNA-immobilized columns effectively accumulated more DNA-intercalating materials than the DNA-films. The DNA-immobilized columns bound endocrine disruptors with a planar structure, such as dioxin-derivatives, polychlorobiphenyl (PCB)-derivatives, and benzo[a]pyrene. Bisphenol A and diethylstilbestrol, which lack a planar structure, did not bind to the DNA-immobilized columns. These results suggest that DNA-immobilized glass bead columns could selectively remove chemical compounds with a planar structure by intercalation into the double-stranded DNA. DNA-immobilized glass beads and DNA-films prepared by UV irradiation have the potential to serve as useful biomaterials for medical, engineering, and environmental applications.

UV-irradiation-induced DNA immobilization and functional utilization of DNA on nonwoven cellulose fabric

Immobilization of double-stranded DNA onto nonwoven cellulose fabric by UV irradiation and utilization of DNA-immobilized cloth were examined. The immobilized DNA was found to be stable in water, with the maximum amount of fabric-immobilized DNA being approximately 20 mg/g of nonwoven fabric. The DNA-immobilized cloth could effectively accumulate endocrine disruptors and harmful DNA intercalating pollutants, such as dibenzo-p-dioxin, dibenzofuran, biphenyl, benzo[a]pyrene and ethidium bromide. Additionally, DNA-immobilized cloth was found to bind metal ions, such as Ag+, Cu2+, and Zn2+. The maximum amounts of bound Ag+, Cu2+, and Zn2+ onto DNA-immobilized cloth (1 g) were approximately 5, 2, and 1 mg, respectively. DNA-immobilized cloth containing Ag+ showed antibacterial activity against Escherichia coli and Staphylococcus aureus. DNA-immobilized cloth without metal ion and with Cu2+ or Zn2+ did not show antibacterial activity. These results suggest that immobilized DNA imparts useful functionality to cloth. DNA-immobilized cloth prepared by UV irradiation has potential to serve as a useful biomaterial for medical, engineering, and environmental application.