Search results for "phytate"

Formation and Stability of Cadmium(II)/Phytate Complexes by Different Electrochemical Techniques. Critical Analysis of Results

2010

In the present work the stability constants of various cadmium(II)/phytate (Phy) species were determined at T = 298.15 K in NaNO3(aq) at I = 0.1 mol·L−1 by DP-ASV (Differential Pulse Anodic Stripping Voltammetry) and by potentiometric titrations using an ISE-Cd2+. Cyclic voltammograms were also recorded to check the electrochemical behavior of cadmium in the presence of phytate. The results were analyzed together with previous data determined by ISE-H+ measurements. Data obtained were used to provide an exhaustive speciation scheme for the phytate/cadmium(II) system at different conditions, as well as a comprehensive representation of the binding ability of phytate toward cadmium(II). Diffe…

Advances in the study of phytate-cation interactions

2008

Effect of extrusion on the anti-nutritional factors of food products: An overview

2017

International audience; Edible plant seeds such as cereals, legumes and nuts contain substantial amounts of nutrients including proteins, carbohydrates, minerals, vitamins, and dietary fibers. However, the bioavailability of these nutrients in humans or animals is relatively low, particularly when they are consumed in their unprocessed or raw form. One of the major factors that contribute to a lower nutritional value of legumes and cereals is the presence of naturally-occurring anti-nutritional factors (ANFs, e.g. phytate, tannins and enzyme inhibitors) that indirectly decreasing the bioavailability status of minerals. Fortunately, these ANFs can be modified or reduced through different pro…

Coopération entre des bactéries solubilisatrices de phosphate et le champignon mycorhizien à arbuscule Rhizophagus irregularis dans la nutrition phos…

2019

National audience; Le phosphore est un élément essentiel pour le développement des plantes. Néanmoins, la majorité des ions phosphate est incorporée dans des structures organiques (Po) et inorganiques (Pi) insolubles qui rende cet élément très peu disponible pour les plantes et en particulier pour la pomme de terre (Solanum tuberosum). Dans les sols, le phytate (molécule de réserve phosphatée des plantes), est une source essentielle. Pour accéder au phosphate, les plantes ont développé des symbioses mutualistes à bénéfices réciproques avec des microorganismes de la rhizosphère capables d’extraire le P. Dans ce contexte, les objectifs de cette étude étaient de i) déterminer si la disponibili…

Palladium(II) sequestration by phytate in aqueous solution. Speciation analysis and ionic medium effects.

2010

Environmental context.In the last 20 years, the demand for palladium and other platinum-group elements has intensified, causing a significant increase in their concentration in the environment, with particular accumulation in urban areas. Knowledge about Pd2+ speciation in aqueous media is fundamental for the understanding of its biological and environmental activity in contaminated areas. Phytic acid appears to be a good sequestering agent towards Pd2+ under various conditions, indicating its potential use in the remediation of contaminated sites. Abstract. Palladium(II) speciation in the presence of phytate (Phy12–) was studied by H+ ion selective electrode (ISE) potentiometry at 25°C in…

Modelling the dependence on medium and ionic strength of molybdate acidbase properties, and its interactions with phytate

2016

The importance of molybdenum from a biological, environmental and technological point of view is very well known since many decades [15]. In particular, it is mainly present in aqueous solutions as molybdate (MoO42), which is the biologically active form, entering in the cells by active transport systems. Though molybdate is the major species in neutral to basic pH conditions, at lower pH it undergoes protonation and, chiefly, polymerization, even at millimolar concentration levels [2]. Consequently, the modelling of its speciation and acidbase properties is not very simple, as demonstrated by the nonhomogeneity of available literature data. In this light, our group has started a systematic…

Palladium(II) sequestration by natural and synthetic chelating agents

2010

Palladium belongs to the so called “Platinum group elements” (PGE), and it is normally present at very low concentration in the environment. In the last twenty years, there has been an increasing PGE demand in different fields such as medicine, electronics, jewellery and car industry. Moreover, palladium (and other PGE) is broadly used as catalyst in a wide number of reactions. The high catalytic properties of PGE favoured their use in the production of catalytic converters. Unfortunately, this caused a noticeable increasing of PGE concentration in the environment, mainly constituted by platinum, with a particular accumulation in urban areas. However, since 1993 platinum has been increasing…