In Figure 4, it can be seen that seven phenolic compounds, namely, gallic acid,
pyrogallol, chlorogenic acid, p-hydroxybenzoic acid, p-coumaric acid, ECG, and CG, were tentatively identified in CPWE and CPEE of TN1 by HPLC analysis.
Methyl-tetrahydrophalic anhydride (MeTHPA),
pyrogallol, tween-80, triton-100, ethanol, sulfuric acid, and nitric acid were purchased from Sinopharm Chemical Reagent Co.
Pyrogallol (20 mM): 25 mg
pyrogallol dissolved in 10 mL distilled water
The tannin structures of the extractives are mainly procyanidin type, consisting of phloroglucinol A-ring, catechol B-ring, and
pyrogallol B-ring.
(8) A previous report demonstrated thiamine quenching of superoxide generated by
pyrogallol autoxidation.
Three millilitres of the solution were added to 20-80 ml of AA, trolox, hydroquinone,
pyrogallol and fruit extracts separately.
Pyrogallol is a phenolic compound with three hydroxyl groups.
The reaction was initiated by addition of
pyrogallol acid (0.2 mM/L, 37[degrees]C for 3 minutes) and the absorbance measured at 420 nm.
Marklund, Involvement of the superoxide anion radical in the autoxidation of
pyrogallol and a convenient assay for superoxide dismutase, Eur J Biochem, 47(3):469-74 (1974).
Oligomera produced on the basis of individual substances of pyrocatechin, hydrochinone and
pyrogallol had low plasticizing ability.
Zhu, "The synthesis, structure and activity evaluation of
pyrogallol and catechol derivatives as Helicobacter pylori urease inhibitors," European Journal of Medicinal Chemistry, vol.