Description

Methyl butyrate is an ester derived from the reaction of butyric acid and methanol. It is known for its fruity, sweet aroma, which is often described as resembling apples or pineapples. This compound is widely used in the flavor and fragrance industries due to its pleasant scent. Methyl butyrate is a common ingredient in food flavorings, perfumes, and other scented products.

Chemical Composition and Structure

The chemical composition of methyl butyrate includes:

Butyric Acid: A short-chain fatty acid with the molecular formula C4H8O2.
Methanol: A simple alcohol with the molecular formula CH3OH, used to form the ester bond.

The structure of methyl butyrate is characterized by:

Ester Bond: Formed between the carboxyl group of butyric acid and the hydroxyl group of methanol.
Molecular Formula: C5H10O2. The structure includes a methyl group (–CH3) attached to the ester linkage, along with the butyrate moiety.
Structure: CH3-CH2-CH2-COO-CH3. This structure results in a fruity and sweet aroma due to the ester bond linking the acid and alcohol components.

Physical Properties

Methyl butyrate is typically a clear, colorless liquid with a fruity and sweet odor. Its physical properties include:

Boiling Point: Approximately 155°C (311°F).
Melting Point: Not typically observed as it remains liquid at standard temperatures.
Solubility: It is soluble in organic solvents like ethanol and oils, but has limited solubility in water.

Production Process

The production process for methyl butyrate involves:

Synthesis: The esterification reaction is carried out by reacting butyric acid with methanol in the presence of an acid catalyst, such as sulfuric acid.
Reaction Conditions: The reaction mixture is heated to facilitate the formation of the ester bond.
Purification: After the reaction, the mixture is purified using distillation to separate methyl butyrate from unreacted materials and by-products.
Characterization: The purified compound is characterized using analytical techniques to confirm its structure and purity.

Applications

Methyl butyrate is used in:

Food Industry: As a flavoring agent in a range of food products, providing a fruity, sweet taste.
Beverages: Incorporated into drinks to impart a pleasant fruit-like flavor.
Fragrances: Used in perfumes and scented products to create fruity, sweet notes.
Cosmetics: Added to personal care products for its appealing aroma.

Safety

Methyl butyrate is generally considered safe for use in food, beverages, and cosmetics when used in recommended concentrations. It should be handled with care to avoid ingestion or inhalation of large quantities. Proper storage and handling are important to ensure safety and product quality.

Environmental and Safety Considerations

The production of methyl butyrate should follow environmentally responsible practices to minimize its ecological impact. Efficient synthesis and purification processes should be employed to reduce waste. Proper labeling and handling are essential to ensure safe use in its various applications.

INCI


Perfuming. Unlike fragrance, which can also contain slightly less pleasant or characteristic odours, the term perfume indicates only very pleasant fragrances. Used for perfumes and aromatic raw materials.
Synonyms:

CAS: 623-42-7 EC number 210-792-1