The contrast agent's molecular structure determines its stability and if it can be re-chelated by a given chelating agent
. The molecular formula of GdDTPA and ZnDTPA are similar, as is the Log K (thermodynamic stability constant).
The work reported in this article has demonstrated the feasibility of the adapted chemical transformation to graft silica surface with PAR chelating agent
and similar moieties.
* Sun Care--solubilizers, dispersing agents, emollients and chelating agents
Two-Way ANOVA test showed that while the different chelating agents
significantly affected the push-out bonding strength of the root canal filling (p<0.05), the different SAF working times did not (p>0.05) (Table 1).
Temperature Ramp time Hold time Steps ([degrees]) (s) (s) Drying 120 10 15 Pyrolysis 600 5 20 Atomization 2000 0 5 Cleaning 2400 1 3 Argon flow rate Steps (mL x [min.sup.-1]) Drying 250 Pyrolysis 250 Atomization 0 Cleaning 250 Table 2: The atomic absorbance of three chelating agents
in three different extraction solvents.
Sample treatments to achieve this could include adjusting the pH to influence hydrogen bonding or adding Mg2+/Ca2+ ions to the solution to saturate the chelating agent
and prevent destabilization of the LPS aggregates.
Oral chelating agents
are best given on an empty stomach.
Dimercaprol and DMPS are chelating agents
principally involved in the treatment of poisoning by arsenic and polonium-210, respectively.
"The expanded capacities for chelating agents
at our Ludwigshafen site enable us to respond to the increasing demand in Europe."
Chelate forms of adsorbents were synthesized in three stages: first stage synthesis of [[Zn.sub.4][Al.sub.2][(OH).sub.12]]*C[O.sub.3]*n[H.sub.2]O (Zn,Al-C[O.sub.3]), second obtaining [Zn.sub.4][Al.sub.2][O.sub.7] of synthesized Zn,Al-C[O.sub.3] via its heat treatment at 450[degrees]C for 1 to 2h, and the third stage synthesis of chelate forms of Zn,Al-L via interaction of mixed oxide [Zn.sub.4][Al.sub.2][O.sub.7] with aqueous solutions of certain chelating agents
containing ammonium hydroxide.
Horticultural Research Laboratory in Fort Pierce, Florida, has found a promising alternative to these chelating agents
. In several greenhouse studies, Albano used EDDS--a readily biodegradable chelating agent--and observed that there was no significant difference in the health, growth patterns, or micronutrient levels in marigolds grown with EDDS and marigolds grown with other popular iron chelating agents
The company said that the proprietary next generation formula does not contain Ethylene diamine tetracetic acid (EDTA) or any other stabilisation and chelating agents
and is free of preservatives.