Surface-enhanced Raman spectroscopy of insect nuclear polyhedrosis virus

The surface-enhanced Raman scattering (SERS) spectra of polydrin of Trabala vishnou nuclear polyhedrosis virus (sample 1) and polydrin of Dendrolimus punctatus nuclear polyhedrosis virus (sample 2) adsorbed in silver hydrosol were investigated. The features in the adsorption mode, enhancement charac ter and mechanism of the SERS spectra of these two samples were compared an d are discussed. It was found that the molecules of sample 1 adsorbed on th e silver surface through carboxyl and amino groups, and the molecules of sa mple 2 through the sulfur atom and also carboxyl and amino groups. The chem isorption of the molecules of both samples and their short-range character indicate that the molecular mechanism is the primary enhancement in the SER S spectra of molecules of these h ro insect viruses. Copyright (C) 2001 Joh n Wiley & Sons, Ltd.