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In this paper, we developed a new biosensor-based on aptamer-mediated carbon quantum dots (apt-CQDs) nanoaggregate for acetamiprid detection. The acetamiprid aptamer, 5′- and its complementary DNA were labeled on CQDs, respectively. The hybridization of aptamer and its complementary DNA triggered the formation of nanoaggregate of CQDs, leading to the fluorescence quenching of the CQDs. Upon addition...
In this paper, a kind of simple and environmental friendly sample pretreatment method was developed for analysis of vitamin D in milk samples. Without saponification or protein precipitation, vitamin D2 and vitamin D3 could be captured directly from milk samples by graphene-coated magnetic particle (Fe3O4@graphene) and separated by magnetic field with only 0.5-mL desorption solvent. The vitamin D2...
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