Question

Discuss how the functional group of Tartrazine influence solubility, reactivity, physical shape and overall fuction.

Answer 1

Tartrazine is a synthetic lemon yellow azo dye generally used for food colouring. It is basically an organic sodium salt which is the trisodium salt of tartrazine acid. Chemical formula : C16H9N4Na3O9S2 IUPAC name : trisodium;5-oxo-1-(4-sulfonatophenyl)-4-[(4-sulfonatophenyl)diazenyl]-4H-pyrazole-3-carboxylate

tartrazine has been used industrially in the fabrication of drugs, especially shells of medicinal capsules, syrups and cosmetics . This fact and its water soluble nature have caused that tartrazine is considered as a persistent contaminant in industrial effluents. Here, it is important to mention that the presence of dyes as tartrazine in wastewaters reduces the photosynthetic activity causing ecological problems to aquatic ecosystems....

it is important to remember that the solvation may change the value of ω relative to gas phase. One of the reasons for this situation is that a polar solvent like water might stabilize charged species relative to the gas phase, and this would cause an increment in the value of ω without having a direct implication on tartrazine reactivity. Thus, it is necessary to highlight that an analysis of chemical reactivity of tartrazine based only on ω values is not definitive. Therefore, a combined analysis of global reactivity descriptors is necessary to identify changes on tartrazine reactivity in the aqueous phase....Chemical (acidity) and optical properties (refractive index and electric susceptibility) were determined for different concentrations on a sensitive range of temperatures.

Tartrazine structure and microstructure have been determined by X-ray diffraction and scanning electron microscopy investigations. Tartrazine has a monoclinic crystalline structure (space group C2/c). Electronic transitions and atomic bonds behaviour in molecules and fluorescent excitation of the compound have been identified by spectroscopic methods

Tartrazine has moderate biological activity when interacting with proteins, obtained antioxidant activity above a threshold concentration of 0.25% and presents plant growth phytotoxicity.