Adipic acid CAS#124-04-9
Low Acidity ： Minimal impact on food pH.
Excellent Buffering Capacity ： Maintains stable pH (2.5–3.0).
Non-Hygroscopic ： Resists moisture absorption.
Enhances Flavor & Texture ： Adds smooth tartness and improves powder set.
Adipic Acid (CAS# 124-04-9)
Adipic acid is an odorless crystalline powder with the lowest acidity among common food acids, offering excellent buffering capacity in pH 2.5–3.0 ranges. It is nonhygroscopic, similar to succinic and fumaric acids, and imparts a smooth tartness to foods. In grape-flavored products, it enhances flavor persistence and improves texture in gelatin-containing powders. These properties make it a preferred accidulant for dry powdered food mixtures, especially those with delicate flavors where tanginess is undesirable. Its aqueous solutions exhibit minimal pH variation (less than half a unit) at concentrations of 0.5–2.4 g/100 mL, enabling effective buffering to maintain acidity within 2.5–3.0—ideal for certain foods while inhibiting fruit browning.
Adipic acid Chemical Properties
Melting point | 151-154 °C(lit.) |
Boiling point | 265 °C100 mm Hg(lit.) |
bulk density | 700kg/m3 |
density | 1,36 g/cm3 |
vapor density | 5 (vs air) |
vapor pressure | 1 mm Hg ( 159.5 °C) |
refractive index | 1.4880 |
FEMA | 2011 | ADIPIC ACID |
Fp | 385 °F |
storage temp. | Store below +30°C. |
solubility | methanol: 0.1 g/mL, clear, colorless |
pka | 4.43(at 25℃) |
form | Solid |
color | White |
Odor | wh. monoclinic prisms, pract. odorless |
PH | 3.74(1 mM solution);3.22(10 mM solution);2.71(100 mM solution); |
biological source | synthetic |
Water Solubility | 1.44 g/100 mL (15 ºC) |
Merck | 14,162 |
JECFA Number | 623 |
BRN | 1209788 |
Dielectric constant | 1.8（Ambient） |
Exposure limits | ACGIH: TWA 5 mg/m3 |
Stability: | Stable. Substances to be avoided include ammonia, strong oxidizing agents. |
Cosmetics Ingredients Functions | FRAGRANCE |
InChIKey | WNLRTRBMVRJNCN-UHFFFAOYSA-N |
LogP | 0.09 at 25℃ |
CAS DataBase Reference | 124-04-9(CAS DataBase Reference) |
NIST Chemistry Reference | Hexanedioic acid(124-04-9) |
EPA Substance Registry System | Adipic acid (124-04-9) |
Safety Information
Hazard Codes | Xi |
Risk Statements | 36-41 |
Safety Statements | 26-39-24/25 |
RIDADR | UN3077 |
WGK Germany | 1 |
RTECS | AU8400000 |
Autoignition Temperature | 788 °F |
TSCA | Yes |
HazardClass | 9 |
HS Code | 29171210 |
Hazardous Substances Data | 124-04-9(Hazardous Substances Data) |
Toxicity | LD50 orally in Rabbit: 5700 mg/kg LD50 dermal Rabbit > 7940 mg/kg |
Product Applications of Adipic Acid (CAS# 124-04-9)
Adipic acid serves as a stable, nonhygroscopic acidulant and flavoring agent, with slight water solubility (1.9 g/100 mL at 20°C) and a pH of 2.86 at 0.6% usage level (25°C). It is widely used in powdered drinks, beverages, gelatin desserts, lozenges, and canned vegetables. Additionally, it functions as a leavening acidulant in baking powder and as a buffering agent to maintain acidity within pH 2.5–3.0. Its applications extend to edible oils, where it helps prevent rancidity.
