According to the proposed DAGON method, the CRP and PSA antigens with the concentrations of 1 pg ml(-1) to 10 pg ml(-1) range can be easily differentiated in the buffer matrix. Moreover, it is for the first time that the multiple antigens with the concentrations of 1 pg ml(-1) and 0.1 pg ml(-1) can be detected in the mixture of the proteins without an amplification technique.
The synthesis of novel iminecalix [4]arenes and further modification thereafter is described using a synthetic strategy. The reaction of the benzaldehyde derivatives with tetraamine functions on the calix[4]arene easily afforded the pure compounds in 92.4-95.7% yields, regardless of the effect of the substituents on the benzaldehyde derivatives. These compounds were stable under the conditions to obtain their analogue dialkylated in the narrow rim, with 83.2-89.9% yields. Characterization of the newly synthesized iminecalix[4]arene derivatives by spectroscopic methods revealed that all compounds are in the cone conformations.
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