My encapsulated compound is essential oil. When I run it in UV I get lots of peaks which look like noise. They look the same even when diluted. In similar papers they report a particular wavelength in which absorbance is measured. I am not sure how they arrived at that conclusion. I don't prefer HPLC because it's expensive where I am. Could anyone please suggest an alternative method for doing in vitro release or how I could find a particular wavelength for my oil?