Introduction & Sensory Profile: The Dual Role of Isovaleric Acid
Isovaleric Acid (also known as 3-Methylbutanoic Acid) is a critical short-chain branched-chain fatty acid (BCFA) that serves as a cornerstone in the flavor, fragrance, and pharmaceutical industries. As a nature-identical compound, it occurs naturally in essential oils, valerian root, and fermented foods. It is highly valued as a versatile building block for synthesizing high-value esters (isovalerates) that define the aromatic profiles of many food flavorings and high-end perfumes.
Characterized by its dual personality, Isovaleric Acid possesses an extremely pungent, "sweaty" or "cheesy" odor in concentrated form. However, when strategically diluted, it imparts an indispensable depth and "funk" to beer, dairy products, and complex fruit accords. Beyond its sensory applications, it is a vital clinical marker in metabolic research, specifically regarding Isovaleric Acidemia (IVA)-a rare genetic disorder involving the improper breakdown of the amino acid leucine. This accumulation of isovaleric acid in the blood and urine is often diagnosed by its characteristic "sweaty feet" odor, making this molecule essential for both industrial synthesis and advanced biochemical diagnostic studies.
Biochemical & Physical Parameters
| Property | Data/Specification | Test Method |
|---|---|---|
| Boiling Point | 176.0 °C @ 760 mmHg | ASTM D1120 |
| Density (25°C) | 0.922 – 0.930 g/mL | Pycnometer |
| Refractive Index (20°C) | 1.402 – 1.405 | Refractometer |
| Melting Point | -29.0 °C | - |
| Flash Point | 70 °C (Closed Cup) | ASTM D93 |
| Solubility | Soluble in Alcohol, Ether, and Chloroform; Moderately soluble in water (25 g/L) | - |
| Acidity (pKa) | 4.77 | Ionization |
Mechanism of Action
- Esterification Precursor: Isovaleric acid functions as a reactive carboxylic acid that readily undergoes esterification with various alcohols. These resulting esters (e.g., Ethyl Isovalerate) lose the pungent odor of the acid and gain highly desirable apple, pineapple, or berry aromas.
- Flavor Potentiation: In the food industry, trace amounts act as a "dirty" note that creates realism. For example, in beer brewing (specifically Brettanomyces fermentation), it provides the characteristic "farmhouse" or "funky" complexity.
- Metabolic Intermediate: In human biology, it is an intermediate in leucine metabolism. Under normal conditions, it is converted into Isovaleryl-CoA. Inhibition of this pathway is the primary cause of isovaleric acidaemia (IVA), where elevated levels in the urine and sweat result in a "sweaty feet" odor, a key diagnostic symptom.
Key Benefits & Features
- Nature-Identical Purity: Derived through precise synthetic routes that mirror the chemical profile of natural extracts from Valerian root.
- High Reactivity: Excellent conversion rates for pharmaceutical intermediates and fragrance ester synthesis.
- Strict Regulatory Compliance: Complies with FEMA (3102) and JECFA standards for food-grade safety.
- Analytical Marker: Our high-purity liquid is ideal for use as a reference standard in clinical labs studying isovaleric acidemia symptoms and leucine metabolism disorders.
Industrial Applications
- Flavoring Agent: Used to recreate the authentic taste of aged cheeses (Cheddar, Parmesan), butter, and tropical fruits.
- Brewing Industry: Essential for sensory training kits to identify "off-flavors" or "funk" in specific craft beer styles.
- Pharmaceuticals: Used as a raw material for the synthesis of sedatives and anticonvulsants.
- Fragrances: Used in low concentrations to add "body" and animalic undertones to masculine perfumes and specialty soaps.
- Clinical Research: Serving as a substrate for studying isovaleric acidemia genereviews and diagnostic protocols.
Safety & Regulatory (SDS Summary)
- GHS Classification: Skin Corrosion (Category 1B); Serious Eye Damage (Category 1).
- Safety Data Sheet (SDS): Available upon request. Always handle with protective gloves and eye protection due to its acidic nature.
- Clinical Relevance: For medical professionals, please refer to GeneReviews for Isovaleric Acidemia regarding the physiological impact of elevated isovaleric acid levels.
FAQ: Frequently Asked Questions
Q: What does Isovaleric Acid smell like?
A: In concentrated liquid form, it has a very strong, pungent odor similar to sweaty feet or rancid cheese.
Q: Is Isovaleric Acid found in the human body?
A: Yes, it is a product of amino acid metabolism. However, high levels of isovaleric acid in urine are usually a sign of a metabolic disorder (IVA).
Q: What is its role in beer?
A: It can be an "off-flavor" from old hops or a desired "funky" characteristic in wild-fermented ales.
Contact Us
Optimize your fragrance and flavor formulations with our High-Purity Isovaleric Acid liquid.
Contact for Bulk Quote | Request Free Sample | SDS/TDS
Please contact us at ella.zhang@huilinbio-tech.com.
Hot Tags: isovaleric acid (3-methylbutanoic acid) liquid, China, suppliers, manufacturers, factory, wholesale, buy, price, bulk, pure, natural, high quality, in stock, for sale
