To look at intervarietal differences in the major sugars of canola
Brassica napus, we used HPLC. We examined 25 varieties.
Kevan et al. 1992, Sugar ratios in nectars of varieties of canola
(Brassica napus). J. apicultural Research 30(2):99-102.
We collected nectars onto filter papers, dried them, and later
eluted the samples off the paper for HPLC. Cheers, Peter Kevan