“…As a kind of elastic light scattering, RLS technique was proposed in 1993 by Pasternack et al [20], which was based on a common spectrofluorometer and had the characters of sensitivity, rapidity, simplicity, and easy operation. Since then, this technique became popular and has been used in various fields such as biochemistry [21,22], surfactants [23], food chemistry [24] and drug analysis [25][26][27][28]. To the best of our knowledge, the analysis of salmeterol xinafoate using AuNPs as probe by RLS has not been reported.…”