BACKGROUND Iron fortification of foods is currently a strategy employed to fight iron deficiency in countries. Liposomes were assumed to be a potential carrier of iron supplements. OBJECTIVE The objective of this study was to investigate the iron transport from ferrous glycinate liposomes, and to estimate the effects of liposomal carriers, phytic acid, zinc and particle size on iron transport...

2,4,6-Tripyridyl-s-triazine (TPTZ) is a color reagent for ferrous ion in the pH range 2 to 10,when ascorbic acid is used as the reducing agent. In this range TPTZ and ferrous ion combine in the ratio of two to one. Tris buffer is commonly used to maintain an alkaline pH, but it reacts with other reducing agents, rendering them ineffective. These observations suggested a method for the joint det...

The effects of the Fenton reagent on recycled unbleached pulp in the absence and presence of a model chemical contaminant, the p-hydroxybenzoic acid (HBA), were studied. In the absence of HBA, the Fenton system clearly modified the chemical and papermaking properties of the pulp. The kappa number was reduced and the specific light absorption coefficient was increased, indicating lignin modifica...

Factors affecting the astaxanthin production by a unicellular green alga, Haematococcus pluvialis UTEX 16, were evaluated with sequential fractional factorial design. To simulate an actual production mode, a two-stage process was adapted for astaxanthin production: the alga was first cultivated under vegetative growth conditions, and then astaxanthin production was induced by applying various i...

A putative gentisate 1,2-dioxygenase was encoded in the dibenzothiophene degradation gene cluster (dbd) from Xanthobacter polyaromaticivorans 127W. The deduced amino acid sequence showed high sequence similarity with gentisate dioxygenases from Pseudomonas alcaligenes (AAD49427, 65% identical), Bradyrhizobium japonicum (NP_766750, 64%), and P. aeruginosa (ZP_00135722, 54%), and moderate similar...

Lantadenes are pentacyclic triterpenoids present in the leaves of the plant Lantana camara. In the present study, in vitro antioxidant activity and free radical scavenging capacity of lantadene A was evaluated using established in vitro models such as ferric reducing antioxidant power (FRAP), 2,2-diphenyl-1-picryl-hydrazyl (DPPH•), hydroxyl radical (OH•), nitric oxide radical (NO•), superoxide ...

We studied the mechanism of formation of oxygen radicals during ferrous ion-induced decomposition of linoleic acid hydroperoxide using the spin trapping and chemiluminescence methods. The formation of the superoxide anion (O2*-) was verified in the present study. The hydroxyl radical is also generated through Fenton type decomposition of hydrogen peroxide produced on disproportionation of O2*-....

Aerobic organisms are faced with a dilemma. Environmental iron is found primarily in the relatively inert Fe(III) form, whereas the more metabolically active ferrous form is a strong pro-oxidant. This conundrum is solved by the redox cycling of iron between Fe(III) and Fe(II) at every step in the iron metabolic pathway. As a transition metal ion, iron can be "metabolized" only by this redox cyc...