Ethyl Macadamiate
Encyclopedia
Ethyl Macadamiate is the ester
of ethyl alcohol and the fatty acid
s derived from Macadamia
Terifolia Seed Oil (q.v.). Ethyl Macadamiate is commonly used in cosmetic
formulations.
. The primary constituents of Ethyl Macadamiate are ethyl oleate
and ethyl palmitoleate.
, with a typical fatty ester
odor. Ethyl Macadamiate's melting (congealing) point is 10°C. and its specific gravity
is 0.88. Ethyl Macadamiate spreads very aggressively, and has a light, nongreasy dry skinfeel similar to that of some silicone
derivatives, however, Ethyl Macadamiate is non-volatile.
, especially in skincare, haircare and suncare formulation. The dry skinfeel and high spread make Ethyl Macadamiate well suited for increasing sunscreen coverage. Ethyl Macadamiate is a promising alternative to cyclomethicone and dimethicone as a skinfeel modifier where a botanical, nonvolatile and/or lipid-soluble substance is preferred.
Ester
Esters are chemical compounds derived by reacting an oxoacid with a hydroxyl compound such as an alcohol or phenol. Esters are usually derived from an inorganic acid or organic acid in which at least one -OH group is replaced by an -O-alkyl group, and most commonly from carboxylic acids and...
of ethyl alcohol and the fatty acid
Fatty acid
In chemistry, especially biochemistry, a fatty acid is a carboxylic acid with a long unbranched aliphatic tail , which is either saturated or unsaturated. Most naturally occurring fatty acids have a chain of an even number of carbon atoms, from 4 to 28. Fatty acids are usually derived from...
s derived from Macadamia
Macadamia
Macadamia is a genus of nine species of flowering plants in the family Proteaceae, with a disjunct distribution native to eastern Australia , New Caledonia and Sulawesi in Indonesia ....
Terifolia Seed Oil (q.v.). Ethyl Macadamiate is commonly used in cosmetic
Cosmetics
Cosmetics are substances used to enhance the appearance or odor of the human body. Cosmetics include skin-care creams, lotions, powders, perfumes, lipsticks, fingernail and toe nail polish, eye and facial makeup, towelettes, permanent waves, colored contact lenses, hair colors, hair sprays and...
formulations.
Chemical structure
Ethyl Macadamiate is the ethyl ester of the free fatty acids produced by the complete saponification of Macadamia oilMacadamia oil
Macadamia oil is the non-volatile oil expressed from the nut meat of the macadamia tree, a native Australian nut...
. The primary constituents of Ethyl Macadamiate are ethyl oleate
Ethyl oleate
Ethyl oleate is the ester formed by the condensation of the fatty acid oleic acid and ethanol. It is a colorless to light yellow liquid. Ethyl oleate is produced by the body during ethanol intoxication....
and ethyl palmitoleate.
Physical properties
Ethyl Macadamiate is a clear, colorless liquid at room temperatureRoom temperature
-Comfort levels:The American Society of Heating, Refrigerating and Air-Conditioning Engineers has listings for suggested temperatures and air flow rates in different types of buildings and different environmental circumstances. For example, a single office in a building has an occupancy ratio per...
, with a typical fatty ester
Ester
Esters are chemical compounds derived by reacting an oxoacid with a hydroxyl compound such as an alcohol or phenol. Esters are usually derived from an inorganic acid or organic acid in which at least one -OH group is replaced by an -O-alkyl group, and most commonly from carboxylic acids and...
odor. Ethyl Macadamiate's melting (congealing) point is 10°C. and its specific gravity
Specific gravity
Specific gravity is the ratio of the density of a substance to the density of a reference substance. Apparent specific gravity is the ratio of the weight of a volume of the substance to the weight of an equal volume of the reference substance. The reference substance is nearly always water for...
is 0.88. Ethyl Macadamiate spreads very aggressively, and has a light, nongreasy dry skinfeel similar to that of some silicone
Silicone
Silicones are inert, synthetic compounds with a variety of forms and uses. Typically heat-resistant and rubber-like, they are used in sealants, adhesives, lubricants, medical applications , cookware, and insulation....
derivatives, however, Ethyl Macadamiate is non-volatile.
Uses
Ethyl Macadamiate is used in cosmeticsCosmetics
Cosmetics are substances used to enhance the appearance or odor of the human body. Cosmetics include skin-care creams, lotions, powders, perfumes, lipsticks, fingernail and toe nail polish, eye and facial makeup, towelettes, permanent waves, colored contact lenses, hair colors, hair sprays and...
, especially in skincare, haircare and suncare formulation. The dry skinfeel and high spread make Ethyl Macadamiate well suited for increasing sunscreen coverage. Ethyl Macadamiate is a promising alternative to cyclomethicone and dimethicone as a skinfeel modifier where a botanical, nonvolatile and/or lipid-soluble substance is preferred.