3D model (JSmol)
|1724945, 1724947 R|
|Molar mass||205.25 g·mol−1|
|Appearance||Highly viscous, colourless liquid|
|Density||1.2 g mL−1 (at 20 °C)|
|Melting point||66 to 69 °C (151 to 156 °F; 339 to 342 K) [contradictory]|
|Boiling point||118 to 120 °C (244 to 248 °F; 391 to 393 K) at 2.7 Pa|
Chiral rotation ([α]D)
|+29° to +30°|
Refractive index (nD)
|A11HA30 (WHO) D03AX03 (WHO), S01XA12 (WHO)|
|Lethal dose or concentration (LD, LC):|
LD50 (median dose)
|10,100 mg kg−1 (intraperitoneal, mouse); 15,000 mg kg−1 (oral, mouse)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Panthenol (also called pantothenol) is the alcohol analog of pantothenic acid (vitamin B5), and is thus a provitamin of B5. In organisms it is quickly oxidized to pantothenic acid. It is a viscous transparent liquid at room temperature. Panthenol is used as a moisturizer and to improve wound healing in pharmaceutical and cosmetic products.
In pharmaceuticals, cosmetics and personal-care products, panthenol is a moisturizer and humectant, used in ointments, lotions, shampoos, nasal sprays, eye drops, lozenges, and cleaning solutions for contact lenses.
In ointments it is used for the treatment of sunburns, mild burns, minor skin injuries and disorders (in concentrations of up to 2–5%). It improves hydration, reduces itching and inflammation of the skin, improves skin elasticity, and accelerates epidermal wounds' rate of healing. For this purpose, it is sometimes combined with allantoin.
It binds to the hair shaft readily; so, it is a common component of commercial shampoos and hair conditioners (in concentrations of 0.1–1%). It coats the hair and seals its surface, lubricating the hair shaft and giving it a shiny appearance.
It is also recommended by tattoo artists as a post-tattooing moisturising cream.
Panthenol readily penetrates into the skin and mucous membranes (including the intestinal mucosa), where it is quickly oxidized to pantothenic acid. Pantothenic acid is extremely hygroscopic, that is, it binds water effectively. It is also used in the biosynthesis of coenzyme A, which plays a role in a wide range of enzymatic reactions and thus in cell growth.
Physical and chemical properties
Panthenol is an odourless, slightly bitter, highly viscous, transparent and colourless liquid at room temperature, but salts of pantothenic acid (for example sodium pantothenate) are powders (typically white). It is easily soluble in water and alcohol, moderately soluble in diethyl ether, soluble in chloroform (1:100), in propylene glycol, and slightly soluble in glycerin.
Panthenol's expanded chemical formula is HO–CH2–C(CH3)2–CH(OH)–CONH–CH2CH2CH2–OH.
Panthenol comes in two enantiomers, D and L. Only D-panthenol (dexpanthenol) is biologically active, however both forms have moisturizing properties. For cosmetic use, panthenol comes either in D form, or as a racemic mixture of D and L (DL-panthenol).
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