Bio-geo hybrid pigment; clay-anthocyanin complex which changes color depending on the atmosphere. (April 2017)

• Record Type: Journal Article
• Authors: Ogawa, Makoto; Takee, Ryo; Okabe, Yuta; Seki, Yoko
• Is Part Of: Dyes and pigments. Volume 139(2017)
• Page Start: 561
• Page End: 565
• Publication Date: 2017-04
• Subjects: Bio-hybrids -- Bio-geo hybrids -- Anthocyanin -- Color change; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2016.12.054
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: A natural pigment, anthocyanin, extracted from purple sweet potato was complexed with smectite group layered clay minerals, a synthetic saponite and a natural montmorillonite. The resulting biohybrid with the synthetic saponite exhibited a clear color change between blue and pink upon exposure to acidic (HCl) and basic (ammonia) vapors. The color change is similar to that of anthocyanin molecule in solution which is due to the change in the molecular structure of anthocyanin. The response for the color change was within 10 min upon exposure to the vapors and was reversible. The present biohybrid composed of environmentally benign chemically stable and non toxic components is regarded as a possible candidate of environmental sensors and smart pigments. Graphical abstract: Highlights: A natural pigment, anthocyanin, was complexed with smectite, a synthetic saponite and a natural montmorillonite. The color of the anthocyanin changed by the reactions to give different colors from pink, colorless and blue. The resulting hybrid exhibited a color change between blue and pink upon exposure to acidic and basic vapors.