Some xylem fibers developed an additional secondary wall layer by the last sampling date that was only slightly lignified, as determined by visual appraisal of
phloroglucinol staining.
Steinberg (1988) demonstrated the grazing-deterrent effects of algal phlorotannins by incorporating them into agar and using assays similar to ours, and pointed out that, unlike low molecular mass compounds such as
phloroglucinol, high molecular mass phlorotannins remained in agar quite well and could be tested in this manner.
Uliginosin B is a natural
phloroglucinol derivative, obtained from Hypericum species native to South America.
Eucalyptone G, a new
phloroglucinol derivative and other constituents from Eucalyptus globulus Labill.
Anti-allergic agents from natural sources (4): anti-allergic activity of new
phloroglucinol derivatives from Mallotus philippensis(Euphorbiaceae).
One unique group of polyphenols present in brown algae is phlorotannins (PT), which are polymers composed exclusively of
phloroglucinol (Ragan and Glombitza, 1986; Arnold and Targett, 1998).
Chou and Patrick (1976) identified butyric, phenylacetic, 4-phenylbutyric, benzoic, p-hydroxybenzoic, vanillic, ferulic, syringic, p-coumaric, t-coumaric, and caffeic acids, resorcinol,
phloroglucinol, and salicyaldehyde from decomposing corn residues; and ferulic, vanillic, phenylacetic, 4-butyric, p-coumaric, p-hydroxybenzoic, salicylic, and o-coumaric acids and salicyaldehyde from decomposing rye residues.
To each 30 [micro]l plasma, 3 ml of
phloroglucinol (sigma) color reagent was added, then placed in boiling water for 4 min, then cooled in ice water, the absorption of each sample was read on a UV/Vis spectrometer (Perkin Elmer) set at 554 nm.
This study is the first to investigate the anticancer effects of the new
phloroglucinol derivative (2,4-bis(4-fluorophenylacetyl)
phloroglucinol; BFP).
Phloroglucinol and catechin were the major end products of tannin degradation while gallate and resorcinol were produced in traces.
Proanthocyanidins and a
phloroglucinol derivative from Rumex acetosa L.
Previous studies have indicated that napthodianthrones like hypericin and pseudohypericin,
phloroglucinol derivative hyperforin (Muller et al.
