Two hydroxyl groups in the catechol ring which are acidic and has able to form
phenoxide anions to react with carbocation species in the side chain.
The acidity of hydroxyl groups result in formation of negatively charged
phenoxide ion which is capable of forming ionic and covalent bonds with aminoacids.13 PA strengthens collagen by making it insoluble through its bonding mechanisms.
Dorovia et al., "Free radical scavenging activity of morin 2'-O
phenoxide anion," Food Chemistry, vol.
The abstraction of hydrogen by DPPH, generates the stable
phenoxide radical.
The mechanism of the reaction and the structure of resol resin in alkaline conditions are dependent on
phenoxide ions.
Phenol is a weak acid with acid dissociation value (pKa) of 9.8 and it dissociates into
phenoxide ion when pH > pKa.
The benzylic anion would be expected to quickly equilibrate to the
phenoxide. This step is pH dependent.
X-ray diffraction studies of the various solid aerosols pools (residential, industrial, transportational, commercial and mix pools) showed that non- clay organic compounds such as GB-Naphthylbismuth dioxide, Sodium hippurate, Sodium-GA-naphthylamine-4- sulfonate tetrahydrate, Potassium
phenoxide, Bismuth salicylate, Cadmium salicylate hydrate, Barium phenolsulfonate are contained in most of the samples in almost comparable amounts.The results of Solid aerosols collected from various pools show that the sources of GB-Naphthylbismuth dioxide, Sodium hippurate, Sodium-GA-naphthylamine-4-sulfonate tetrahydrate, Potassium
phenoxide, Bismuth salicylate, Cadmium salicylate hydrate, Barium phenolsulfonate in the Solid aerosols are both local and remote.
Open chain-like isomers of spiropyrans Could be stabilized, and influence of reverse bleaching cyclization reaction could be reduced by the effect of competitive parallel processes that block either the former spiro carbon atom or the
phenoxide oxygen atom and hinder cyclization into original spiro form.
* [alpha]-[Al.sub.2] [O.sub.3] (Korund Benatky, SRO, Czech Rep.); [lambda]-Al[(OH).sub.3], gibbsite (Lachema Brno Comp., proven by XRD method); kaolinite (Kaolin Sedlec IA Standard, Sedlecky kaolin AS, Czech Rep.); aluminum
phenoxide Al[([H.sub.2]O).sub.3][([C.sub.6][H.sub.5]O).sub.3] (Sigma Aldrich, elemental analysis see Table 1); as polyphenolic complex, Al-catechin complex prepared according to (Chen, Wang and Huang, 2006) was chosen.
Phosphorus levels in serum and urine were estimated by the reaction with ammonium molybdate (Sigma-Aldrich, USA) and sulphuric acid, and measuring absorbance at 340 nm, of an unreduced complex of phosphomolybdate (20) Alkaline phosphatase activity was measured by estimating the liberation of phosphate and formation of 4-nitro
phenoxide from p-nitrophenol phosphate (Sisco Research Laboratories, Mumbai) (21).