Mucin 1 (MUC1) which presents in epithelial malignancies, is a well-known tumor biomarker. In this paper, a highly sensitive and selective fluorescent aptasensor for Mucin 1 (MUC1) detection is constructed, utilizing graphene oxide (GO) as a quencher which can quench the fluorescence of single-stranded dye-labeled MUC1 specific aptamer. In the absence of MUC1, the adsorption of the dye-labeled aptamer on GO brings the dyes in close proximity to the GO surface resulting in high efficiency quenching of dye fluorescence. Therefore, the fluorescence of the designed aptasensor is completely quenched by GO, and the system shows very low background fluorescence. Conversely, and very importantly, upon the adding of MUC1, the quenched fluorescence is recovered significantly, and MUC1 can be detected in a wide range of 0.04–10 μM with a detection limit of 28 nM and good selectivity. Moreover, the results have also been verified for real sample application by testing 2% serum containing buffer solution spiked with a series of concentrations of MUC1.

This study presents a linear charge-coupled device (CCD) spectrometer and its application to quantitative determination of rutin with UV-Vis spectrophotometry and fluorimetry detections. The spectrometer can obtain spectrum with the range of 271.44 nm from one exposure and the 1.7 nm resolution. With the same spectrometer, the determination of rutin in rutin tablet was successfully studied by measuring the absorption and laser-induced fluorescence emission. The data shows that there is no significant difference for determining rutin between the two methods. The result implies that the spectrometer, which realizes two different analytical methods, can be widely used in trace analysis.