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| | DL-Histidine Basic information |
| | DL-Histidine Chemical Properties |
| Melting point | 273 °C (dec.)(lit.) | | Boiling point | 278.95°C (rough estimate) | | density | 1.3092 (rough estimate) | | refractive index | 1.6500 (estimate) | | storage temp. | Keep in dark place,Inert atmosphere,Room temperature | | solubility | 0.5 M HCl: soluble | | pka | 1.8(at 25℃) | | form | powder to crystal | | color | White to Almost white | | Merck | 14,4720 | | BRN | 7800 | | CAS DataBase Reference | 4998-57-6(CAS DataBase Reference) | | EPA Substance Registry System | Histidine (4998-57-6) |
| | DL-Histidine Usage And Synthesis |
| Chemical Properties | white to slightly yellow crystalline powder | | Uses | histidine is a skin-conditioning amino acid. | | Uses | DL-Histidine has been used to study the fouling behaviour of polyethersulfone ultrafiltration membranes made with different PVP (polyvinylpyrrolidone). | | Definition | ChEBI: An alpha-amino acid that is propanoic acid bearing an amino substituent at position 2 and a 1H-imidazol-4-yl group at position 3. | | Synthesis Reference(s) | Journal of the American Chemical Society, 67, p. 502, 1945 DOI: 10.1021/ja01219a513
Chemical and Pharmaceutical Bulletin, 35, p. 3447, 1987 | | Biochem/physiol Actions | L-Histidine is involved in the one-carbon unit metabolism. It is associated with protein methylation. L-Histidine is a part of hemoglobin structure and function. L-Histidine is a component of dipeptides with antioxidative property. Histidine serves as a precursor for the formation of histamine, which is associated with allergic responses. Urocanic acid, an immune response modulator in skin is also biosynthesised from histidine. |
| | DL-Histidine Preparation Products And Raw materials |
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