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Food black 2 27755 diazo 2118-39-0: Blue MX-R: Reactive blue 4 61205 anthraquinone 13324-20-4: BODIPY: Dipyrrometheneboron difluoride 138026-71-8: Brazilin/Brazilein: Natural red 24 75280 natural 474-07-7: Brilliant Black BN: Food Black 1 28440 diazo 2519-30-4: Brilliant blue FCF: Erioglaucine FD&C Blue No. 1 Acid blue 9 Food blue 2 42090 ...
Dyes, therefore, must have an affinity for the substance they are intended to color. [4] Chemically speaking, pigments can be organic or inorganic, while dyes are only organic. Furthermore, organic white pigments do not exist, despite the fact that the majority of purified crystalline organic products are white in appearance. [5]
Sudan stains and Sudan dyes are synthetic organic compounds that are used as dyes for various plastics (plastic colorants) and are also used to stain sudanophilic biological samples, usually lipids. Sudan II , Sudan III , Sudan IV , Oil Red O , and Sudan Black B are important members of this class of compounds (see images below).
It was the first natural dye for which an industrial synthesis was developed as early as 1869. Anthraquinone dyes include red insect dyes derived from scale insects such as carminic acid, kermesic acid, and laccaic acids. The colorant carmine with the main component carminic acid is used, for example, as an approved food colorant E 120. [4]
Also called direct dyes, substantive dyes are employed for cellulose-based textiles, which includes cotton. The dyes bind to the textile by non-electrostatic forces. In another classification, azo dyes can be classified according to the number of azo groups. Trypan blue is an example of a direct dye, used for cotton.
A dye is a colored substance that chemically bonds to the substrate to which it is being applied. This distinguishes dyes from pigments which do not chemically bind to the material they color. Dye is generally applied in an aqueous solution and may require a mordant to improve the fastness of the dye on the fiber. [2]
Brilliant blue FCF (Blue 1) is a synthetic organic compound used primarily as a blue colorant for processed foods, medications, dietary supplements, and cosmetics. [1] It is classified as a triarylmethane dye and is known under various names, such as FD&C Blue No. 1 or acid blue 9.
The main advantages of carbonyl dyes are the possibility of reducing the carbonyl groups to water-soluble dienols (→Vat dyes), which is advantageous in industrial applications. On the other hand, by introducing suitable electron donating groups, the absorption maximum of the resulting dyes can be shifted to almost any region of the VIS spectrum.
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