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Zinc pyrithione (or pyrithione zinc) is a coordination complex of zinc. It has fungistatic (inhibiting the division of fungal cells) and bacteriostatic (inhibiting bacterial cell division) properties and is used in the treatment of seborrhoeic dermatitis [ 2 ] and dandruff .
Pyrithione is the common name of an organosulfur compound with molecular formula C 5 H 5 NOS, chosen as an abbreviation of pyridinethione, and found in the Persian shallot. [4] It exists as a pair of tautomers, the major form being the thione 1-hydroxy-2(1H)-pyridinethione and the minor form being the thiol 2-mercaptopyridine N-oxide; it crystallises in the thione form. [5]
Like selenium sulfide, zinc pyrithione (a zinc complex with two chelating pyrithione anions) also reduces epidermal turnover and inhibits fungal growth. [3] [unreliable medical source?] It is often administered with ketoconazole for better results. The symptoms do not resolve completely even after prolonged medication.
Structure of zinc pyrithione, a popular antidandruff medicine. Zinc pyrithione is a coordination complex of a sulfur-substituted pyridine-N-oxide. This zinc complex has useful fungistatic and bacteriostatic properties.. [5]
1) Zinc pyrithione is a coordination complex of zinc salt and pyrithione salt. 2) As mentioned in the body of text, zinc pyrithione has been applied in shampoo for many years. This information should be included in the leading section. 3) The emphasis of the use of zinc pyrithione in seborrheic dermatitis is not appropriate.
Zinc is a strong reducing agent with a standard redox potential of −0.76 V. Pure zinc tarnishes rapidly in air, rapidly forming a passive layer. The composition of this layer can be complex, but one constituent is probably basic zinc carbonate, Zn 5 (OH) 6 CO 3. [8] The reaction of zinc with water is slowed by this passive layer.
Zinc pyrithione is used in antifouling paints. [152] Zinc powder is sometimes used as a propellant in model rockets. [153] When a compressed mixture of 70% zinc and 30% sulfur powder is ignited there is a violent chemical reaction. [153] This produces zinc sulfide, together with large amounts of hot gas, heat, and light. [153]
The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
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