**Author details**

**Figure 8.** Detection of A20 cells (green) in system mixed with 5T33MM cells (red) by fluorescence macroscopy after

The mixed system has been prepared in three different ratios (A20:5T33MM = 1:1, 1:10, 1:100) of the two labeled live cell lines [59]. The efficiency of detection also in a complex system demonstrated the high selectivity of the device, confirming that the use of an Id-peptide immobilized on a silicon-based chip could be a good proof-of-concept for future researches.

In this chapter, we focused on the functionalization and activation of crystalline and porous silicon surfaces to develop devices allowing the identification of specific ligand-receptor

As an example, we report new results about the realization of devices suitable to highlight the specific interaction between cell surface receptors and corresponding specific ligands. One of these devices was applied to detect the binding of extremely aggressive murine A20 lympho‐ ma cells to a specific IgG antibody as molecular probe directed against B-cell receptor. The result was encouraging and prompted us to develop an improved device, more sensitive, for the specific recognition of different types of tumor cells. Another approach was based on the specificity of an idiotype peptide endowed with high-affinity toward A20 lymphoma cells. Particularly, the use of an Id-peptide as probe allowed to obtain a uniform sensor surface coating, thus enhancing capture ability also at low cell concentrations. Moreover, the biosen‐ sor was biocompatible and showed high repeatability as well as selectivity in label-free cell

The improved device opens the way to the development of unique diagnostic tools in pointof-care testing for recognition and isolation of patient-specific neoplastic B cells during the

incubation on planar silicon pA20-36 modified sensor.

192 Lab-on-a-Chip Fabrication and Application

**7. Conclusions**

interactions.

detection.

Nicola Massimiliano Martucci1\*, Nunzia Migliaccio1 , Immacolata Ruggiero1 , Ilaria Rea2 , Monica Terracciano2 , Luca De Stefano2 , Paolo Arcari1 , Ivo Rendina2 and Annalisa Lamberti1

\*Address all correspondence to: nicolamassimiliano.martucci@unina.it

1 Department of Molecular Medicine and Medical Biotechnology, University of Naples, Federico II, Naples, Italy

2 Institute for Microelectronics and Microsystems of Naples, National Research Council, Naples, Italy
