Progesterone is an important reproductive hormone and an environmental endocrine disruptor. In this study,a ratio fluorescence probe of aptamer-functionalized infinite coordination polymers(CDs-Tb/GMP@Apt ICPs) was developed. The aptamer can specifically recognize progesterone,the ICPs provide detection signals,and the carbon dots(CDs) provide internal standard signals. When progesterone is added,the fluorescence of ICPs is quenched at 489 nm and 545 nm,while the fluorescence of CDs remains stable at 445 nm. Progesterone was detected by the change in the fluorescence ratio of ICPs to CDs,which reduced the background interference. Based on this principle,a smartphone-assisted “Lab-in-a-tube”in-tube detection device was constructed. Within the range of 15 to 300 nmol/L,the logarithm of the progesterone concentration showed a linear relationship with the ratio B/(R+G+B) of the color of the test strip,and the limit of detection was 7.2 nmol/L. This method was applied to the determination of progesterone in surface water and biological samples. The spiked recoveries ranged from 97.3% to 104%,and the relative standard deviations were from 1.2% to 4.7%. This probe has good selectivity and strong anti-interference ability. With the assistance of smartphones for detection,it is easy to operate,reduces the dependence on large instruments,and is suitable for on-site rapid detection. It provides a new technology for on-site detection of progesterone as well as pollution prevention and control.
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