{"id":545,"date":"2022-10-10T08:24:56","date_gmt":"2022-10-10T08:24:56","guid":{"rendered":"https:\/\/mebicar.pl\/sklep\/l-tyrosine-l-tyrosine-tyrosine-purity-%e2%89%a5-99-1000mg\/"},"modified":"2026-08-13T18:24:26","modified_gmt":"2022-10-10T08:24:56","slug":"l-tyrosine-2","status":"publish","type":"product","link":"https:\/\/mebicar.pl\/en\/sklep\/l-tyrosine-2\/","title":{"rendered":"L-Tyrosine Crystalline Powder: Specification Sheet and Purity Assessment Routes"},"content":{"rendered":"\n\n
Zestawienie parametr\u00f3w materia\u0142u<\/caption>\n
Parameter<\/th>Value<\/th><\/tr><\/thead>\n
Substance<\/td>L-tyrosine, proteinogenic amino acid, synthetic material<\/td><\/tr>\n
CAS registry number<\/td>60-18-4<\/td><\/tr>\n
Summary formula<\/td>C9H11NO3<\/td><\/tr>\n
Formula weight<\/td>181.19<\/td><\/tr>\n
Configuration<\/td>L, single stereocentre in the side chain<\/td><\/tr>\n
Appearance<\/td>White crystalline powder<\/td><\/tr>\n
Declared assay<\/td>Not less than 99 percent of the main component<\/td><\/tr>\n
Net mass<\/td>1000 mg per sealed unit<\/td><\/tr>\n
Solubility character<\/td>Sparingly soluble in water, dissolves in dilute acid and in alkali<\/td><\/tr>\n
Water content<\/td>By Karl Fischer titration or loss on drying, per batch<\/td><\/tr>\n
Sulfated ash<\/td>Determined per batch and stated on the certificate<\/td><\/tr>\n
Storage<\/td>Cool, dry, sealed, protected from light<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n

What the phenol group changes for the analyst<\/h2>\n\n\n\n

Among the standard amino acids this one carries a phenolic hydroxyl on an aromatic ring, and that single structural detail governs most of the analytical work. The ring gives a genuine ultraviolet chromophore, so direct detection is possible where aliphatic amino acids demand derivatisation. The same hydroxyl makes the molecule susceptible to oxidation, which is why discoloured material is held rather than used.<\/p>\n\n\n\n

Assay routes and their limits<\/h2>\n\n\n\n

Classical ion-exchange separation with post-column ninhydrin detection remains the reference approach for amino acid material and copes well with a crystalline solid of this kind. Reversed-phase liquid chromatography with ultraviolet detection is faster and takes advantage of the aromatic ring directly. Non-aqueous acid-base titration gives a total figure for the amino acid function but says nothing about which amino acid is present, so it never closes identity on its own. See also our catalogue listing: ALCAR \/ Acetyl-L-Carnitine – Purity \u2265 99% net weig<\/a>.<\/p>\n\n\n\n

Chemical purity against optical purity<\/h2>\n\n\n\n

These two properties are measured separately and confusing them is the commonest error on a receiving bench. Chemical assay answers how much of the sample is tyrosine in any configuration; optical purity answers how much of that tyrosine is the L form. The second requires either a chiral stationary phase or a polarimetric determination under defined conditions, and the result belongs on the batch certificate.<\/p>\n\n\n\n