Dear Harro,
My laboratory had the opportunity to participate in a alteration of honey
study back in 1990-1991. The resultas were published in 1992. I am not into
honey alteration field, therefore, I do not know if there are more recent
publications in this area of work. I hope  this reference may help you.
Xavier


Dr. Xavier A. Alcala-Herrera
GERG
Texas A&M University
 
White, J. W.  (1992), Internal standard stable carbon isotope ratio method
for determination of C-4 plant sugars in honey: collaborative study and
evaluation of improved protein preparation procedure. Collaborators:
Alcala-Herrera, J. A., C. Boutton, C. Cook, C. Guilmette, J. Lipp, R. H.
Reesman, R. Scalan, K. Winters, and J. G. Phillips, Journal of AOAC
International, 75(3), pp. 543-548.