Synthetic colorants tartrazine

As an example, five different synthetic colorants (Tartrazine, Sunset Yellow, Ponceau 4R, Amaranth, and Brilliant Blue FCF) from drinks and candies were separated on a polyamide adsorbent at pH 4, eluted with an alkaline-ammonia solution. By another method, 13 synthetic food colorants were isolated from various foods using specific adsorption on wool. After elution with 10% ammonia solution and gentle warming, an absorption spectrum of the resulting colorant solution was recorded, compared to the reference spectra of pure colorants, and identified by linear regression analysis. ... 

Very few works dealing with the determination of these synthetic colorants in foods have been published. In 2012, Medeiros et al. developed a single-line flow injection system for the simultaneous determination of two pairs of synthetic colorants Tartrazine-Sunset Yellow and Brilliant Blue-Sunset Yellow in several food products (juice drinks, gelatines, and nutrient-enhanced sports drinks), without a previous separation step, by coupling FIA with multiple pulse amperometry (MPA) with a boron-doped electrode [42]. The influence of flow conditions on the MPA response was evaluated by varying the flow rate from 0.45 to 3.5 mL/min, obtaining a maximum electrical current at... 

French researchers provided an alternative to the tartrazine synthetic colorant (E 102), valorizing a phloridzine oxidation product (POP) generated as a by-product of the cider industry. Phloridzine is a polyphenol specific to apples and shows good antioxidant capacity. When apples are pressed to yield juice, phloridzine, oxygen, and polyphenoloxidase enzyme combine to form POP. This brilliant yellow natural colorant with nuances dependent on pH level can be incorporated easily into water-based foods such as beverages (juices, syrups) and confectionery creams because it is stable during production processes. Details about the specific formulations of these colorants are presented in Section 5.1. 

Color modification Synthetic dyes Tartrazine (FD C yellow5) Sunset Yellow... 

Fig. 1 TLC and visible absorption spectra of synthetic colors extracted from a pickled vegetable under TLC/scanning densitometry. (A) Standards of tartrazine (Y-4), orange I (Or-I), and orange RN (Or-RN). (B) Standard of orange H (Or-II). (C) Extract of the sample. TLC/scanning densitometric conditions. Plate RP-18 (E. Merck). Solvent system methyl ethyl ketone-methanol-5 % sodium sulfate (1 1 1). Apparatus Shimadzu CS-9000. Wavelength scanning range 370 700 nm. Slit size 0.4 X 0.4 mm. Measuring mode reflecting absorption.

In 2007, seven synthetic additives [Quinoline Yellow, Ponceau 4R, Allura Red, Azorubine (carmoisine), Tartrazine, Sunset Yellow, and Sodium Benzoate] were evaluated in a study conducted by the University of Southampton [7]. The study was intended to investigate the effects of these color additives in children from 3 to 9 years old. The study provided supporting evidence of a possible link between the test mixtures and hyperactivity in children, but the role of food color additives in affecting children s behavior is controversial. 

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