Abstract
A label-free interferometric transducer showing a theoretical detection limit for homogeneous sensing of 5×10-8 RIU, being equivalent to a protein mass coverage resolution of 2.8fg mm-2 , is used to develop a high sensitive biosensor for protein detection. The extreme sensitivity of this transducer combined with a selective bioreceptor layer enables the direct evaluation of the human growth hormone (hGH) in undiluted urine matrix in the 10pgmL-1 range.
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