Lanthanide induced formation of novel luminescent alginate hydrogels and detection features.
Responsive photo-luminescent soft matters have led to the design of optical sensors and switches. In this research, two new organic-inorganic type hybrid hydrogels have been fabricated by the self-assembly of sodium alginate and lanthanide elements. The incorporation of europium ions (Eu(3+)) (or terbium ions (Tb(3+))) was required for the gelation of the dissolved alginate and thermally stable gels were formed. It has been found that red/green emissions derived from lanthanide ions were clearly identified in pure aqueous media through the metal coordination interactions with assembled alginate. These supramolecular structures could partially prevent the Eu(3+) (or Tb(3+)) from being attacked by high frequency vibrations. More importantly, the lanthanide luminescence could be switched "off-on" in the presence of the anthrax biomarker sodium dipicolinate (NaDPA). The detection limits (for NaDPA) were determined to be 8.3×10(-8)M and 9.0×10(-8)M based on Eu(III) and Tb(III) gel, respectively.
School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China. Electronic address: qmwang@scnu.edu.cn.
Qianmin
Q
Ma
Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China; School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China; Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, Guangzhou 510006, PR China.
Qianming
Q
Wang
D000464:Alginates / Q000737:chemistry*; D005063:Europium / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D020100:Hydrogels / Q000737:chemistry*; D049408:Luminescent Agents / Q000737:chemistry*; D055595:Mechanical Phenomena; D010848:Picolinic Acids / Q000032:analysis / Q000737:chemistry; D013725:Terbium / Q000737:chemistry*; D014867:Water / Q000737:chemistry
D000464:Alginates; D006603:Hexuronic Acids; D020100:Hydrogels; D049408:Luminescent Agents; D010848:Picolinic Acids; D014867:Water; D013725:Terbium; D005063:Europium; D020723:Glucuronic Acid; C004860:dipicolinic acid
Alginate; Dipicolinate; Hydrogel beads; Lanthanides