Home Categories Organic Chemistry Butyric acid
A1266412

Butyric acid , StandardforGC,>99.5%(GC) , 107-92-6

Synonym(s):
Butanoic acid;Butyric acid

CAS NO.:107-92-6

Empirical Formula: C4H8O2

Molecular Weight: 88.11

MDL number: MFCD00002814

EINECS: 203-532-3

Update time: 2022-07-08

PRODUCT Properties

Melting point: ?6-?3 °C (lit.)
Boiling point: 162 °C (lit.)
Density  0.964 g/mL at 25 °C (lit.)
vapor density  3.04 (vs air)
vapor pressure  0.43 mm Hg ( 20 °C)
refractive index  n20/D 1.398(lit.)
FEMA  2221 | BUTYRIC ACID
Flash point: 170 °F
storage temp.  Store below +30°C.
solubility  Chloroform (Soluble), Isopropanol (Sparingly), Methanol (Slightly);Miscible with water, Propylene glycol, Glycerin, alcohol and oils.
pka 4.83(at 25℃)
form  Liquid
Specific Gravity 0.960 (20/4℃)
color  Clear colorless
PH 3.94(1 mM solution);3.42(10 mM solution);2.92(100 mM solution);
Odor at 1.00 % in dipropylene glycol. sharp acetic cheese butter fruit
Odor Type cheesy
Odor Threshold 0.00019ppm
explosive limit 2-12.3%(V)
Water Solubility  MISCIBLE
JECFA Number 87
Merck  14,1593
BRN  906770
Dielectric constant 3.0(Ambient)
Stability: Flammable. Incompatible with strong oxidizing agents, aluminium and most other common metals, alkalies, reducing agents.
InChIKey FERIUCNNQQJTOY-UHFFFAOYSA-N
LogP 1.1 at 25℃

Description and Uses

Butyric acid is a carboxylic acid also classified as a fatty acid. It exists in two isomeric forms as shown previously, but this entry focuses on n-butyric acid or butanoic acid. It is a colorless, viscous, rancid-smelling liquid that is present as esters in animal fats and plant oils. Butyric acid exists as a glyceride in butter, with a concentration of about 4%; dairy and egg products are a primary source of butyric acid. When butter or other food products go rancid, free butyric acid is liberated by hydrolysis, producing the rancid smell. It also occurs in animal fat and plant oils.

Butyric acid is used in the preparation of various butyrate esters. Low-molecular-weight esters of butyric acid, such as methyl butyrate, have mostly pleasant aromas or tastes. As a consequence, they find use as food and perfume additives. It is also used as an animal feed supplement, due to the ability to reduce pathogenic bacterial colonization. It is an approved food flavoring in the EU FLAVIS database (number 08.005).
Due to its powerful odor, it has also been used as a fishing bait additive. Many of the commercially available flavors used in carp (Cyprinus carpio) baits use butyric acid as their ester base; however, it is not clear whether fish are attracted by the butyric acid itself or the substances added to it. Butyric acid was, however, one of the few organic acids shown to be palatable for both tench and bitterling. The substance has also been used as a stink bomb by Sea Shepherd Conservation Society to disrupt Japanese whaling crews, as well as by anti-abortion protesters to disrupt abortion clinics.

Safety

Symbol(GHS) 
GHS05,GHS07
Signal word  Danger
Hazard statements  H302-H314
Precautionary statements  P270-P280-P301+P312-P301+P330+P331-P303+P361+P353-P305+P351+P338
Hazard Codes  C,Xi
Risk Statements  34
Safety Statements  26-36-45
RIDADR  UN 2820 8/PG 3
WGK Germany  1
RTECS  ES5425000
13
Autoignition Temperature 824 °F
Hazard Note  Irritant
TSCA  Yes
HS Code  2915 60 19
HazardClass  8
PackingGroup  III
Toxicity LD50 orally in rats: 8.79 g/kg (Smyth)

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