According to Gratzer's Math into LaTeX, 3rd Ed., p. 389, if you're using BiBTeX, you cannot comment out a field with the % sign. Are you using BiBTeX? If so, you might consider simply leaving that field blank. For example:
title = ,
author = "W. Sparreboom and A. van den Berg and J.C.T. Eijkel",
year = 2010,
journal = njp,
volume = 12,
pages = 015004,
% note = "nanofluidics systems review"
I have to admit I don't know if this will work or not. But it's worth a try. If you're using BiBTeX, you might consider getting your hands on Oren Patashnik's BiBTeXing.