TCI C0393 trans-p-Coumaric Acid, CAS 501-98-4, is a hydroxycinnamic acid that occupies a central position in the plant phenylpropanoid pathway. It serves as a precursor to lignin, flavonoids, and related phenolic metabolites, and is routinely used as a reference standard for phenolic quantification in natural product and food analysis. Its antioxidant character and characteristic UV absorption also make it useful in radical-scavenging assays and as a matrix material in certain mass spectrometry techniques. Available from AMI Scientific in 25 g, 100 g, and 500 g packs, it should be stored cool, dry, and protected from light to preserve the trans configuration.
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