xanthene


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Related to xanthene: xanthene dye

xan·thene

(zan'thēn),
1. The basic structure of many natural products, drugs, dyes (for example, fluorescein, pyronin, eosins), indicators, pesticides, antibiotics, etc.
2. A class of molecules based upon xanthene (1).

xanthene

[zan′thēn]
Etymology: Gk, xanthos, yellow
a crystalline organic compound in which two benzene rings are fused to a central pyran ring. The pyran oxygen bridges the two benzene rings. It is a parent chemical structure of many medicinal elements.

xan·thene

(zan'thēn)
The basic structure of many natural products, drugs, dyes (e.g., fluorescein, pyronin, eosins), indicators, pesticides, and antibiotics.

xan·thene

(zan'thēn)
Basic structure of many natural products, drugs, dyes (e.g., fluorescein, pyronin, eosins), indicators, pesticides, and antibiotics.
References in periodicals archive ?
The low-temperature solution polycondensation technique was employed for the synthesis of novel aromatic polyamides containing both fluorene or xanthene cardo moieties and fluorinated phenoxy pendant groups as shown in Scheme 2.
We can interpret the result by the presence of the flexible fluorinated phenoxy pendant groups and bulky fluorene or xanthene cardo structures, which inhibited the close packing of the polymer chains and weakened intermolecular hydrogen bonding, thus resulting in the amorphous nature of these polyamides.
These new polyamides exhibited higher solubility than the conventional aromatic polyamides, which is attributed to the presence of fluorinated phenoxy pendant groups and bulky fluorene or xanthene cardo structures in the polymer backbone, which resulted in the decrease in the interaction of polymer chains by increasing the distance between polymer chains.
In addition, the polyamides containing xanthene cardo groups exhibited slightly lower [T.
As shown in Table 3, the design of polyamides with the incorporation of fluorinated phenoxy pendant group and bulky fluorene or xanthene cardo structure provides not only excellent solubility but also high thermal stability.
The decreased dielectric constants of these fluorinated polyamides could be attributed to the incorporation of fluorine substituents into polymers because of the small dipole and the low polarizability of the C--F bond as well as the increase in the free volume and also because of the decrease in the water absorption [46, 47], Additionally, the incorporation of bulky fluorene or xanthene cardo groups into polymer backbones can result in a less efficient chain packing and further reduce the number of polarizable groups per unit volume, thus also decreasing the dielectric constant.
Among synthetic dyes most used by the food market are erythrosine, included in the class of xanthene dyes, and brilliant blue, classified as a triphenylmethane dye (BRASIL, 2005).
The xanthene class of food dyes is widely used in coloring foods, especially Erythrosine, being behind only the Azo dye class.
Rose Bengal is a red, xanthene dye (including other members like phloxine b, erythrosine, and eosin yellow) that produces reactive, singlet oxygen when exposed to light.
Phloxine B and Eosin Yellow are halogenated photoactive xanthene dyes, that are FDA approved for use in human cosmetics and drugs.
Phloxine B is a halogenated Photoactive xanthene dye that is FDA approved for use in human cosmetics and drugs.