Detection of small molecules based on surface plasmon (correction of plasman) resonance technology

OBJECTIVE: To develop a detective method applied in online assaying of astronauts' humours using the portable online bio-molecules analyzer (POBA) based on surface plasmon resonance biosensor. METHOD: An assay format was developed based on the detection of 2, 4-Dinitrophenyl-hydrazine. The bio-molecule slide was made by DNP-BSA. Range of detection and standard curve were obtained using inhibition assay. Reliability and specificity of the assay were also tested. RESULT: 1) The linear range of the assay was 7.8 ng/ml-2 micrograms/ml with lower detection limit of 2.5 ng/ml; 2) Preparation of the bio-molecule slide and regeneration of the biosensor ensured detections for many samples. CONCLUSION: This assay method can be used to detect small molecules sensitively, rapidly and easily. It can be repeated with good reliability, and has a good application in space medicine.