Journal
ANALYTICAL METHODS
Volume 5, Issue 1, Pages 124-133Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ay25922b
Keywords
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Funding
- National Natural Science Foundation of China [21105117, 21275158, 21275068, 21171085]
- Chinese Academy of Sciences [KZCX2-EW-206]
- Natural Science Foundation of Shandong Province of China [ZR2010BQ027, ZR2010BM027]
- Chinese Academy of Sciences
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We demonstrated the construction and characteristics of photonic and magnetic dual responsive molecularly imprinted polymers (DR-MIPs) prepared by combination of stimuli-responsive polymers and a molecular imprinting technique. The resultant DR-MIPs of Fe3O4@MIPs exhibited specific affinity for caffeine and photoisomerization induced reversible uptake and release of caffeine upon alternate UV and visible light irradiation. With irradiation at 365 nm, 62.5% of the receptor-bound caffeine was released from the DR-MIPs back into solution. Subsequent irradiation with visible light caused 93.6% of the released caffeine to be rebound by the DR-MIPs. The novel DR-MIPs were used as a sorbent for the enrichment of caffeine from real water and beverage samples. Recoveries ranging from 89.5-117.6% were achieved. The magnetic property of DR-MIPs provided fast and simple separation while the photonic responsive property offered simple template elution with the assistance of UV-Vis irradiation. The simple, rapid and reliable DR-MIPs based method proved potentially applicable for trace caffeine analysis in complicated samples.
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