Allantoin
Chemical name (2,5-Dioxo-4-imidazolidinyl) urea
General
Chemical formula	C4H6N4O3
Molecular weight	158.1164 g/mol
Appearance	white crystalline powder
CAS number	97-59-6
MSDS	Allantoin MSDS
SMILES	O=C1C(NC(=O)N1)NC(=O)N
Other names
?
Physical properties
Density and phase at STP	? g/cm3 (?)
Solubility	0.5% in water (25 °C)
Specific gravity	?
Crystal structure	?
pH (10% solution with water)	?
Acidity constant (pKa)	?
Thermal decomposition	? °C (? K)
Phase behavior
Melting point	239 °C
Boiling point	? °C (? K)
Triple point	? K (? °C)  ? bar
Critical point	? K (? °C)  ? bar
Heat of fusion (ΔfusH)	? kJ/mol
Entropy of fusion (ΔfusS)	? J/mol·K
Heat of vaporization (ΔvapH)	? kJ/mol

Allantoin is a botanical extract of the comfrey plant and is used for its healing, soothing, and anti-irritating properties. Allantoin helps to heal wounds and skin irritations and stimulate growth of healthy tissue. This extract can be found in anti-acne products, sun care products, and clarifying lotions because of its ability to help heal minor wounds and promote healthy skin. IUPAC nomenclature is a system of naming chemical compounds and of describing the science of chemistry in general. ... Image File history File links Allantoin. ... A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... The molecular mass of a substance (less accurately called molecular weight and abbreviated as MW) is the mass of one molecule of that substance, relative to the unified atomic mass unit u (equal to 1/12 the mass of one atom of carbon-12). ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences and alloys. ... This page meets Wikipedias criteria for speedy deletion. ... Smile (album), for the musical, see Smile (Musical) and for the bank, see smile (bank) Smile was also the name of the band later known as Queen. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i. ... Temperature and air pressure can vary from one place to another on the Earth, and can also vary in the same place with time. ... A substance is soluble in a fluid if it dissolves in that fluid. ... Relative density (also known as specific gravity) is a measure of the density of a material. ... Rose des Sables (Sand Rose), formed of gypsum crystals In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ... The correct title of this article is pH. The initial letter is capitalized due to technical restrictions. ... Dissolving table salt in water In chemistry, a solution is a homogeneous mixture composed of one or more substances known as solutes that are dissolved in another substance known as a solvent. ... A girl in a swimming pool Water (from the Old English waeter; c. ... ... The melting point of a solid is the temperature at which it changes state from solid to liquid. ... The boiling point of a substance is the temperature at which it can change its state from a liquid to a gas throughout the bulk of the liquid at a given pressure. ... In physics, the triple point of a substance is the temperature and pressure at which three phases (gas, liquid, and solid) of that substance may coexist in thermodynamic equilibrium. ... The bar (symbol bar) and the millibar (symbol mbar, also mb) are units of pressure. ... Chemistry In chemistry, a critical point is the conditions ( temperature, pressure) at which the liquid state of the matter ceases to exist. ... Heat of fusion is the amount of heat energy which must be absorbed or lost for 1 gram of a substance to change states from a solid to a liquid or vice versa. ... The Entropy of fusion of a substance represents the increase in the degree of disorder involved in the transition from an organized crystalline solid to the disorganized structure of a liquid. ... The heat of vaporization is a physical property of substances. ... Species Symphytum asperum Lepechin Symphytum officinale L. Symphytum tuberosum L. Symphytum x uplandicum Nyman Comfrey is an important herb in organic gardening, having many medicinal and fertiliser uses. ...

Its chemical formula is C₄H₆N₄O₃. It is also called 5-ureidohydantoin, glyoxyldiureide, and 5-ureidohydantoin. It is a product of oxidation of uric acid. It is a diureide of glyoxylic acid. It is a product of purine metabolism in most mammals except higher apes, and it is present in their urine. Uric acid is an organic compound of carbon, nitrogen, oxygen and hydrogen and the structure shown right: Uric acid is the final oxidation product of purine metabolism in the human body and is found in small amounts in urine. ... Glyoxylic acid or oxoacetic acid is an organic compound with the chemical formula C2H2O3 and structure HOC-COOH. Other synonyms are formylformic acid and oxoethanoic acid. ... Purine is a heterocyclic aromatic organic compound, consisting of a pyrimidine ring fused to an imidazole ring. ... Orders Subclass Multituberculata (extinct) Plagiaulacida Cimolodonta Subclass Palaeoryctoides (extinct) Subclass Triconodonta (extinct) Subclass Eutheria (includes extinct ancestors)/Placentalia (excludes extinct ancestors) Afrosoricida Artiodactyla Carnivora Cetacea Chiroptera Cimolesta (extinct) Creodonta (extinct) Condylarthra (extinct) Dermoptera Desmostylia (extinct) Embrithopoda (extinct) Hyracoidea Insectivora Lagomorpha Litopterna (extinct) Macroscelidea Mesonychia (extinct) Notoungulata (extinct) Perissodactyla Pholidota Plesiadapiformes... Urine is liquid waste excreted by the kidneys and is produced by the process of filtration. ...

The keratolytic effect and abrasive and astringent properties of allantoin are used in skin softening cosmetic preparations. It is also frequently present in toothpaste, mouthwash, and other oral hygiene products, in shampoos, lipsticks, various cosmetic lotions and creams, and other cosmetic and pharmaceutical products. An astringent is a chemical substance that tends to shrink or constrict body tissues, usually locally after topical medicinal application. ... Modern toothpaste gel Toothpaste is a paste or gel used to clean and improve the aesthetic appearance and health of teeth. ... Antiseptic mouth rinse, often called mouthwash, is an oral hygiene product that claims to kill the germs that cause plaque, gingivitis, and bad breath. ... Oral hygiene is keeping the mouth clean. ... Please discuss this issue on the talk page, or replace this tag with a more specific message. ... Lipstick is a cosmetic substance for the lips that is richer in color and texture than lip gloss and has the primary purpose of applying color to the lips. ...

Synonyms

• udder cream
• ureidohydantoin
• glyoxyldiureide
• hemocane
• (2,5-dioxo-4-imidazolidinyl)-urea
• 5-ureidohydantoin

Editor: Sujit Kumar Dolai Avadesh Saraogi Amit Kumar Panigrahi Pijush Kanti Midya