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特異的な構造を有する二重らせんDNAは主にインターカレーションと呼ばれる作用によって平面構造を有する有害化学物質を捕捉することが知られているしかし機械的強度の脆弱性や高い水溶性等の問題点があり吸着材としての利用は長らく限定されていた本研究においてDNA/ポリウレタン複合発泡材料DNA/PUCFを作製することによって二重らせんDNAをポリウレタンフォームに封入しそれらの問題点を解決した作製したDNA/PUCF の吸着性能評価は代表的な平面構造を有する有害化学物質臭化エチジウムアクリジンオレンジ及びエオシンBを用いて行われたその結果DNA/PUCFは陽イオン性である臭化エチジウム及びアクリジンオレンジに対して高い吸着能を示したが陰イオン性であるエオシンBに対しては吸着能を示さなかったこの実験結果よりDNA塩基対へのインターカレーションには有害物質の持つ電荷が大きく寄与することが示された更に金属イオンの吸着実験を行ったところDNA/PUCFへの吸着は銀イオンは他金属イオンよりも親和性が高い結果を得たDNA/PUCFを作製することによって伸縮性があり機械的強度が強く耐久性及び利便性の高い平面構造を有する陽イオン性有害化学物質除去材が得られたDouble-helix DNA, because of its unique morphology, is capable for capturing chemical hazards of planer structures, mainly due to the so-called intercalation interactions. Its intrinsic properties, such as mechanical weakness and high water solubility, however, have long been drawbacks restricting practical applications. These intrinsic difficulties of DNA were overcome in this study by encapsulation of the double-helix DNA using polyurethane by the formation of DNA/polyurethane composite foams (DNA/PUCF). The adsorptive capability of the resulting DNA/PUCF was evaluated using ethidium bromide, acridine orange and eosin B, as typically hazardous chemicals having planer structures. DNA/PUCF has shown high ability for absorbing ethidium bromide and acridine orange, both carrying positively charged moieties ; but no ability was found for eosin B, which is a negatively charged species, indicating that the charges on the hazardous molecules play an important rule in determining their distribution into the base-pairs of DNA where the intercalation takes a place. The investigation of DNA by using silver ions (Ag) as reactive ions gave experimental evidence to confirm a fact that DNA involved in the DNA/PUCF kept their double-helix structures. DNA/PUCF is robust, mechanically strong, durable, and highly useful for eliminating positively charged, water-soluble type of hazardous chemicals of planer structures

Development of DNA/Polyurethane Composite Foam for Adsorption of Chemical Hazards