p-Coumaric acid appears as a white to pale yellow powder. It dissolves in hot ether and hot ethanol, is slightly soluble in benzene, and is nearly insoluble in petroleum ether. A derivative of cinnamic acid, it occurs widely in natural products such as propolis, vegetables, and fruits, and shows clear antioxidant activity. In nature, p-coumaric acid is mainly found as organic acid esters, glycosides, or amides.

Pharmaceuticals: p-Coumaric acid is used in the synthesis of novel expectorants, such as rhodopsin, and acts as an intermediate in the production of drugs for coronary heart disease, including senna. It is also applied in the manufacture of local anesthetics, bactericides, and hemostatic agents, shows inhibitory effects on cervical cancer, and is involved in the synthesis of the anti-adrenergic drug esmolol.

Agriculture: In agriculture, p-coumaric acid is used to produce plant growth promoters, long-lasting fungicides, and preservatives for fruits and vegetables. It also serves as a chemical reagent for detecting uranium and vanadium and is a key raw material for the production of photosensitive resins and vinylcinnamic acid.

Cosmetics: p-Coumaric acid inhibits tyrosinase activity, reducing both monophenolase and diphenolase activity by about 50%, and is therefore used in cosmetics to reduce melanin formation and control skin pigmentation.

p-Coumaric acid should be stored in a cool, dry, and dark environment, typically at room temperature (approximately 15-25°C). Maintain a relative humidity below 60% to prevent decomposition due to moisture absorption. It is recommended to use a sealed glass container and avoid contact with strong acids, strong alkalis, or oxidizing agents. Keep away from heat and fire sources to ensure safety.

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