DL-Histidine, Free Base
DL-Histidine, Free Base
CAS: 4998-57-6
Molecular Formula: C6H9N3O2
DL-Histidine, Free Base - Names and Identifiers
| Name | DL-Histidine, Free Base |
| Synonyms | H-DL-His-OH DL-Histdine DL-Histidine Polyhistidine DL-Histidine 0 hydrogen histidinate histidine, homopolymer 1H-Imidazole-4-alanine DL-Histidine, Free Base H-DL-His-OH (DL-Histidine rac-(R*)-2-Amino-3-(4-imidazolyl)propionic acid |
| CAS | 4998-57-6 |
| EINECS | 225-660-9 |
| InChI | InChI=1/C6H9N3O2/c7-5(6(10)11)1-4-2-8-3-9-4/h2-3,5H,1,7H2,(H,8,9)(H,10,11) |
DL-Histidine, Free Base - Physico-chemical Properties
| Molecular Formula | C6H9N3O2 |
| Molar Mass | 155.15 |
| Density | 1.3092 (rough estimate) |
| Melting Point | 273°C (dec.)(lit.) |
| Boling Point | 278.95°C (rough estimate) |
| Flash Point | 231.3°C |
| Solubility | 0.5 M HCl: soluble |
| Vapor Presure | 3.25E-09mmHg at 25°C |
| Appearance | powder to crystal |
| Color | White to Almost white |
| Merck | 14,4720 |
| BRN | 7800 |
| pKa | 1.8(at 25℃) |
| Storage Condition | Keep in dark place,Inert atmosphere,Room temperature |
| Refractive Index | 1.6500 (estimate) |
| MDL | MFCD00005208 |
| Physical and Chemical Properties | White or colorless crystalline substance, odorless, sweet; Soluble in water, insoluble in ethanol, chloroform and ether and other organic solvents; Decomposition point of 287 ℃. |
DL-Histidine, Free Base - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R22 - Harmful if swallowed R36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S22 - Do not breathe dust. S24/25 - Avoid contact with skin and eyes. S36/37 - Wear suitable protective clothing and gloves. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
| WGK Germany | 3 |
| HS Code | 29339900 |
DL-Histidine, Free Base - Reference
| Reference Show more | 1. Qu, Fei, et al. "Fluorescent Detection of 2, 4-Dichlorophenoxyacetic Acid in Food Samples Based on Covalent Organic Frameworks and MnO 2 Nanosheets." Food Analytical Methods 13.10 (2020): 1842-1851.https://doi.org/10.1007/s12161-020-01807-2 2. [IF=5.923] Cuihua Chen et al."Variations in Physiology and Multiple Bioactive Constituents under Salt Stress Provide Insight into the Quality Evaluation of Apocyni Veneti Folium."Int J Mol Sci. 2018 Oct;19(10):3042 3. [IF=4.556] Dandan Zhao et al."Physico-chemical properties and free amino acids profiles of six wolfberry cultivars in Zhongning."J Food Compos Anal. 2020 May;88:103460 4. [IF=4.379] Feng Lin et al."Chemical profile changes during pile fermentation of Qingzhuan tea affect inhibition of α-amylase and lipase."Sci Rep-Uk. 2020 Feb;10(1):1-10 5. [IF=3.361] Ning Zhao et al."Ratiometric fluorescence probe of Cu2+ and biothiols by using carbon dots and copper nanoclusters."Rsc Adv. 2021 Oct;11(53):33662-33674 6. [IF=4.242] Hang Yang et al."Dietary leucine requirement of juvenile largemouth bass (Micropterus salmoides) based on growth, nutrient utilization and growth-related gene analyses."Aquaculture. 2022 Jun;555:738207 7. [IF=3.935] Min Zhang et al."Chemical profile and miscarriage prevention evaluation of Jiao-ai decoction, a classical traditional Chinese formula."JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS. 2022 May;:114832 8. [IF=3.463] Xiaomei Dai et al."S-alk(en)ylcysteine sulfoxides biosynthesis and free amino acids profile in different parts of postharvest chive (Allium schoenoprasum L.)."SCIENTIA HORTICULTURAE. 2022 Sep;303:111191 9. [IF=5.82] Jiaqi Wu et al."Role of microbial metabolites of histidine in the development of colitis."MOLECULAR NUTRITION & FOOD RESEARCH |
DL-Histidine, Free Base - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| use | for biochemical research. |
| production method | L-histidine hydrochloride is used as raw material, acetic anhydride is added under alkaline conditions for acylation reaction, ethanol extraction and excess acetone precipitation to obtain acetyl-DL-histamine acid; The acetyl-DL-histamine acid is refluxed in hydrochloric acid for several hours, and the crude DL-histamine acid is obtained by ethanol precipitation, the pure product is then crystallized and purified. |
Last Update：2024-04-09 20:52:54
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