1. Peroxidase has been assayed by a chronometric method involving the coupled reaction of ascorbic acid with the product of the enzymic action on benzidine. 2. Measurements of the activities of horseradish and tea peroxidase by this and two other methods, involving respectively pyrogallol and o-dianisidine, are compared. 3. It is claimed that the chronometric method is relatively simple, rapid ...

Thallium ions are transported to the interior of gallium-seamed pyrogallol[4]arene nanocapsules. In comparison to the capture of Cs ions, the extent of which depends on the type and position of the anion employed in the cesium salt, the enhanced strength of Tl···π vs Cs···π interactions facilitates permanent entrapment of Tl(+) ions on the capsule interior. "Stitching-up" the capsule seam with ...

In a previous paper (1) a calorimetric phenol oxidase method was presented which utilizes catechol as a mediator and in which the oxidation of a leucoindophenol is followed photometrically over a very short time interval. During the development of this method it was found that the same basic method and technique were applicable to the determination of peroxidase. In the latter case, oxidation o...

Witch hazel ( Hammamelis virginiana) bark is a rich source of both condensed and hydrolizable oligomeric tannins. From a polyphenolic extract soluble in both ethyl acetate and water, we have generated fractions rich in pyrogallol-containing polyphenols (proanthocyanidins, gallotannins, and gallates). The mixtures were highly active as free radical scavengers against ABTS, DPPH (hydrogen donatio...

Laccases are polyphenol oxidases produced by many fungi and have many applications in textile, food and beverage, and pulp and paper industries. Laccase production can be induced using aromatic or phenolic compounds that mostly affect the transcription of laccase-encoding genes. In this study, we analyzed laccase and biomass production by Agaricus blazei in the presence of different concentrati...

BACKGROUND/AIM To investigate the effects of spermine NONOate in the cavernous tissue obtained from mice treated or untreated with sildenafil. MATERIALS AND METHODS We studied the effects of spermine NONOate on the tone and nitrergic relaxation responses of isolated mouse corpus cavernosum and compared them with sodium nitroprusside in the absence or presence of L-nitroarginine, hydroxocobala...