Table I. Positive (+) and negative (−) ion peaks representative of stilbene glucosides and their aglycons as detected by TOF-SIMS from authentic stilbene standards in frozen-hydrated and freeze-dried conditions (Standards).

Corresponding positive ion peaks that were detected predominantly from Norway spruce phloem are highlighted in brackets. Positive and negative ion peaks (estimated to represent stilbenes) were obtained from the freeze-dried extracts of Norway spruce phloem (Bark). No peaks were representative of stilbene compounds at m/z ≥ 200 in phloem specimens that had had their extracts chemically removed (i.e. extracted and dried specimens).

Compound	Frozen-Hydrated		Freeze-Dried
	+	−	+	−
Standards
Resveratrol	228, [229]	227	[228], 229	227, 228
Piceatannol	244, [245]	243	244, [245]	243
Isorhapontigenin	258, [259]	257	258, [259]	257
Piceid	228, [229], 391	227	[228], 229, 390	227, 389
Astringin	429, [406]a	243, 405	244, [245], 406	243, 405
Isorhapontin	258, [259], [420], 421	257, 419	258, [259], 420	258, 419
Bark
Phloem extracts			228, 229, 244, 245, 258, 259, 406, 408, 420, 421, 422	243, 405, 406
Extracted phloem tissue	–	–	Nob	Nob

^aVery low peak counts were observed from the standard.

^bNonobservable amounts of stilbene peaks at m/z ≥ 200 when the phloem specimen analyzed by TOF-SIMS were subjected to chemical extraction and then reanalyzed by TOF-SIMS. In contrast, some stilbene-related peaks were detected in the extracts of the phloem (i.e., freeze-dried extracts).