Home > Products

Trans-Cinnamic Acid

Cinnamic acid is a white crystalline compound with the formula C6H5CH=CHCOOH which is slightly soluble in water, and freely soluble in many organic solvents. It exists as trans and cis isomers, but the trans form is the one most often found in nature and is widely used in commerce. Trans-Cinnamic acid is very important because it is widely used in perfume, food, photographic, polymer and pharmaceutical industries. Landmark provides both cis-cinnamic acid(CAS NO. 621-82-9) and trans-cinnamic acid(CAS NO. 140-10-3). 

Cinnamic acid is an organic compound with the formula C6H5CH=CHCOOH. It is a white crystalline compound that is slightly soluble in water, and freely soluble in many organic solvents. Classified as an unsaturated carboxylic acid, it occurs naturally in a number of plants. It exists as both a cis and a trans isomer, although the latter is more common.

Cinnamic acid is a central intermediate in the biosynthesis of myriad natural products include lignolsto lignin and lignocellulose, flavonoids, isoflavonoids, coumarins, aurones, stilbenes, catechin, and phenylpropanoids. Its biosynthesis is performed by action of the enzyme phenylalanine ammonia-lyase (PAL) on phenylalanine.

Cinnamic acid is a precursor for the synthesis of a huge number of plant substances, including lignin, tannins, flavonoids, pigments, many of the flavor components of spices, and various alkaloids, such as morphine and colchicine.


Product name: Cinnamic Acid

Synonyms: trans-Cinnamic acid; trans-3-Phenyl-2-propenoic acid; 3-Phenylpropenoic acid; Cinnamylic acid; 2-Propenoic acid, 3-phenyl-, (2E)-; 3-Phenylacrylic acid; 3-Phenylacrylic acid

CAS NO.: 140-10-3

Melting point: 133 °C

Boiling point: 300 °C

Density: 1.248

Refractive index: 1.5049

Flash point: >230 °F

Storage temp.: Store at RT.

Solubility: 0.4g/l

PH: 3-4 (0.4g/l, H2O, 20℃)

Form: White Crystalline Powder

Content: ≥99%

Packaging: 25kg kraft paper bag

Storage method: pay attention to the fire source, especially to avoid sunlight, and store it in a cool place.

Solubility: Soluble in ethanol, methanol, petroleum ether, chloroform, soluble in benzene, ether, acetone, glacial acetic acid, carbon disulfide and oil, insoluble in cold water.


1. Flavors and fragrances

It can be used as an aromatic mixture in soaps, shampoos, washing powders, and daily cosmetics. Cinnamonic acid is used in apple flavor, cherry flavor, fruit flavor, and floral fragrance. It has the effect of inhibiting the formation of black tyrosinase, has a certain insulating effect on ultraviolet rays, can make brown spots lighter or even disappear, and is one of the essential ingredients in advanced sunscreen. Cinnamic acid itself is a kind of spice, which has a good aroma-retaining effect. It is usually used as a raw material for fragrant, which makes the aroma of the main fragrance more volatile.

2. The pharmaceutical industry

In the pharmaceutical industry, it can be used as an important drug for the synthesis and treatment of coronary heart disease. It can be used as a heart-to-heart and heart-to-heart, as well as synthetic chlorpheniric acid and cinnamyl piperazine. It can be used to make "Xin Kean", local anesthetic, fungicide, hemostasis. Medicine, etc. Chlorobenamide and cinnamyl piperazine can also be synthesized for use as a spine bone relaxant and an antispasmodic agent. Mainly used for cerebral thrombosis, cerebral arteriosclerosis, coronary artery cirrhosis and other diseases. It has a significant inhibitory effect on the proliferation of lung adenocarcinoma cells.

3. Organic synthesis

In terms of organic chemical synthesis, cinnamic acid can be used as a sustained release agent for galvanized sheets, a heat stabilizer for polyvinyl chloride, a crosslinker for polyurethane, a flame retardant for hydantoin and polycaprolactam, and a chemical analysis reagent. It is also a reagent for determining the separation of uranium and vanadium; it is also the most important synthetic raw material for negative-type photosensitive resins. The main synthetic lauric acid ester, polyvinyl alcohol cinnamate, ethyl ethoxy cinnamate and epoxy resin with pendant cinnamate. Used in plastics, it can be used as heat stabilizer for PVC, anti-mold and deodorant for sterilizing, and can also be added into rubber and foam to make deodorant shoes and insoles. It can also be used for cotton and various synthetic fibers, leather and paint. Prevent mildew in products such as shoe polish and straw mats.