Engineering Quantum Dot (Cadmium Sulfide) on Antibodies for Fluoroimmunoassays

Figure 5

FTIR analysis. (a) This shows the FTIR spectrum of L-cysteine. (b) Spectrum of bare CdS QD shows the specific spinal structure of CdS QD with associated peaks. (c) Spectrum of cysteine-capped CdS QD confirmed the successful capping of CdS with cysteine because of the absence of SH peak and appearance of amine and carboxylic peaks. (d) Spectrum of rabbit polyclonal IgG-conjugated cysteine-capped CdS QD showed successful binding of proteins because of the change in peak patterns and intensities.

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