Section 1. IDENTIFICATION OF THE SUBSTANCE/MIXTURE Product identifiers Product name : D-Alanine-3-13C CAS-No. : 133665-48-2 Relevant identified uses of the substance or mixture and uses advised against Identified uses : Laboratory chemicals, Manufacture of substances Section 2. HAZARDS IDENTIFICATION Classification of the substance or mixture Not a hazardous substance or mixture according to Regulation (EC) No. 1272/2008. This substance is not classified as dangerous according to Directive 67/548/EEC. Label elements The product does not need to be labelled in accordance with EC directives or respective national laws. Other hazards - none Section 3. COMPOSITION/INFORMATION ON INGREDIENTS Substances Formula : 13CC2H7NO2 Molecular Weight : 90,09 g/mol Component Concentration D-Alanine-3-13C CAS-No. 133665-48-2 - Section 4. FIRST AID MEASURES Description of first aid measures If inhaled If breathed in, move person into fresh air. If not breathing, give artificial respiration. In case of skin contact Wash off with soap and plenty of water. In case of eye contact Flush eyes with water as a precaution. If swallowed Never give anything by mouth to an unconscious person. Rinse mouth with water. Most important symptoms and effects, both acute and delayed To the best of our knowledge, the chemical, physical, and toxicological properties have not been thoroughly investigated. Indication of any immediate medical attention and special treatment needed no data available Section 5. FIRE-FIGHTING MEASURES Extinguishing media Suitable extinguishing media Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide. Special hazards arising from the substance or mixture no data available Advice for firefighters Wear self contained breathing apparatus for fire fighting if necessary. Further information no data available Section 6. ACCIDENTAL RELEASE MEASURES Personal precautions, protective equipment and emergency procedures Avoid dust formation. Avoid breathing vapors, mist or gas. Environmental precautions Do not let product enter drains. Methods and materials for containment and cleaning up Sweep up and shovel. Keep in suitable, closed containers for disposal. Reference to other sections For disposal see section 13. Section 7. HANDLING AND STORAGE Precautions for safe handling Provide appropriate exhaust ventilation at places where dust is formed. Conditions for safe storage, including any incompatibilities Store in cool place. Keep container tightly closed in a dry and well-ventilated place. Store under inert gas. hygroscopic Specific end uses no data available Section 8. EXPOSURE CONTROLS/PERSONAL PROTECTION Control parameters Components with workplace control parameters Exposure controls Appropriate engineering controls General industrial hygiene practice. Personal protective equipment Eye/face protection Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU). Skin protection Handle with gloves. Gloves must be inspected prior to use. Use proper glove removal technique (without touching glove's outer surface) to avoid skin contact with this product. Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices. Wash and dry hands. The selected protective gloves have to satisfy the specifications of EU Directive 89/686/EEC and the standard EN 374 derived from it. Body Protection Choose body protection in relation to its type, to the concentration and amount of dangerous substances, and to the specific work-place., The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace. Respiratory protection Respiratory protection is not required. Where protection from nuisance levels of dusts are desired, use type N95 (US) or type P1 (EN 143) dust masks. Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU). Section 9. PHYSICAL AND CHEMICAL PROPERTIES Information on basic physical and chemical properties a) Appearance Form: solid b) Odour no data available c) Odour Threshold no data available d) pH no data available e) Melting point/freezing Melting point/range: 291 °C - lit. point Melting point/range: 291 °C - dec. f) Initial boiling point and no data available boiling range g) Flash point no data available h) Evaporation rate no data available i) Flammability (solid, gas) no data available j) Upper/lower no data available flammability or explosive limits k) Vapour pressure no data available l) Vapour density no data available m) Relative density no data available n) Water solubility no data available o) Partition coefficient: n- no data available octanol/water p) Autoignition no data available temperature q) Decomposition no data available temperature r) Viscosity no data available s) Explosive properties no data available t) Oxidizing properties no data available Other safety information no data available Section 10. STABILITY AND REACTIVITY Reactivity no data available Chemical stability no data available Possibility of hazardous reactions no data available Conditions to avoid no data available Incompatible materials Strong oxidizing agents Hazardous decomposition products Other decomposition products - no data available Section 11. TOXICOLOGICAL INFORMATION Information on toxicological effects Acute toxicity no data available Skin corrosion/irritation no data available Serious eye damage/eye irritation no data available Respiratory or skin sensitization no data available Germ cell mutagenicity no data available Carcinogenicity IARC: No component of this product present at levels greater than or equal to 0.1% is identified as probable, possible or confirmed human carcinogen by IARC. Reproductive toxicity no data available Specific target organ toxicity - single exposure no data available Specific target organ toxicity - repeated exposure no data available Aspiration hazard no data available Potential health effects Inhalation May be harmful if inhaled. May cause respiratory tract irritation. Ingestion May be harmful if swallowed. Skin May be harmful if absorbed through skin. May cause skin irritation. Eyes May cause eye irritation. Signs and Symptoms of Exposure To the best of our knowledge, the chemical, physical, and toxicological properties have not been thoroughly investigated. Additional Information RTECS: Not available Section 12. ECOLOGICAL INFORMATION Toxicity no data available Persistence and degradability no data available Bioaccumulative potential no data available Mobility in soil no data available Results of PBT and vPvB assessment no data available Other adverse effects no data available Section 13. DISPOSAL CONSIDERATIONS Waste treatment methods Product Offer surplus and non-recyclable solutions to a licensed disposal company. Contaminated packaging Dispose of as unused product. Section 14. TRANSPORT INFORMATION UN number ADR/RID: - IMDG: - IATA: - UN proper shipping name ADR/RID: Not dangerous goods IMDG: Not dangerous goods IATA: Not dangerous goods Transport hazard class(es) ADR/RID: - IMDG: - IATA: - Packaging group ADR/RID: - IMDG: - IATA: - Environmental hazards ADR/RID: no IMDG Marine pollutant: no IATA: no Special precautions for user no data available SECTION 15 - REGULATORY INFORMATION N/A
The metabolic and biochemical impact of glucose 6-sulfonate (sulfoquinovose), a dietary sugar, on carbohydrate metabolism
作者:Juliana L. Sacoman、Lauren N. Badish、Thomas D. Sharkey、Rawle I. Hollingsworth
DOI:10.1016/j.carres.2012.09.014
日期:2012.11
the metabolism of this sugar through three main carbohydrate processing pathways and how this could influence its biological activity. Using (13)C NMR spectroscopy and enzyme assays, we showed that glucose 6-sulfonate cannot enter the pentosephosphatepathway, hence decreasing pentose and nucleotide biosyntheses. In glycolysis, glucose 6-sulfonate only provides one pyruvate per monosaccharide molecule
The formation of furan and 2-methylfuran was studied in model systems based on sugars and selected amino acids. Both compounds were preferably formed underroastingconditions in closed systems yielding up to 330 micromol of furan and 260 micromol of 2-methylfuran per mol of precursor. The amounts obtained under pressure cooking conditions were much lower, usually below 20 micromol/mol, except for
obtain different isolated trappedradical spectra where hyperfinecoupling constants could be evaluated. For alanine, only two species are identified with relative proportions around 97 and 3% in contradiction with recent published articles. The main species has a particularity on its hyperfinecoupling constants when labeled carbons are used. Very high hyperfinecoupling constants are observed with
Biocatalytic reductive amination as a route to isotopically labelled amino acids suitable for analysis of large proteins by NMR
作者:Jack S. Rowbotham、Jake H. Nicholson、Miguel A. Ramirez、Kouji Urata、Peter M. T. Todd、Gogulan Karunanithy、Lars Lauterbach、Holly A. Reeve、Andrew J. Baldwin、Kylie A. Vincent
DOI:10.1039/d3sc01718d
日期:——
and easy to use H2-driven biocatalytic platform for the enantioselective incorporation of 2H-atoms into amino acids. By combining the biocatalytic deuteration catalyst with amino acid dehydrogenase enzymes capable of reductive amination, we synthesised a library of multiply isotopically labelled amino acids from low-cost isotopic precursors, such as 2H2O and 15NH4+. The chosen approach avoids the use
我们展示了一种原子效率高且易于使用的 H 2驱动生物催化平台,用于将2 个H 原子对映选择性掺入氨基酸中。通过将生物催化氘化催化剂与能够还原胺化的氨基酸脱氢酶相结合,我们从低成本同位素前体(例如2 H 2 O 和15 NH 4 + )合成了多重同位素标记的氨基酸库。所选择的方法避免使用预先标记的2 H-还原剂,因此大大简化了产品清理。值得注意的是,该策略使得2 H、15 N 和不对称中心能够在良性条件下以完全选择性的一步引入到分子位点,并且具有接近 100% 的原子经济性。该方法有利于半克规模的氨基酸同位素体的制备。这些氨基酸在分析生命科学中具有广泛的适用性,特别是蛋白质的核磁共振光谱分析。为了证明该方法对蛋白质 NMR 化学家工作流程的好处,我们制备了L -[α- 2 H, 15 N, β- 13 C]-丙氨酸并将其集成到大型 (>400 kDa) 热休克中蛋白质寡聚物,随后可通过甲基-TROSY
Formation of 4-Hydroxy-2,5-dimethyl-3(2<i>H</i>)-furanone and 4-Hydroxy-2(or 5)-ethyl-5(or 2)-methyl-3(2<i>H</i>)-furanone through Maillard Reaction Based on Pentose Sugars
作者:Imre Blank、Laurent B. Fay
DOI:10.1021/jf950439o
日期:1996.1.1
The caramel-like smelling compounds 4-hydroxy-2,5-dimethyl-3(2H)-furanone (HDMF) and 4-hydroxy-2(or 5)-ethyl-5(or 2)-methyl-3(2H)-furanone (HEMF) were identified by GC-MS and GC-MS/MS in Maillard reaction systems based on pentoses. The reaction was performed in a phosphate buffer by heating xylose, ribose, or arabinose with glycine or L-alanine at 90 degrees C for 1 h. HEMF was detected in the system pentose/alanine. HDMF was formed in both pentose/glycine and pentose/alanine systems as well as directly from pentoses. Experiments using C-13-labeled glycine and alanine suggest the incorporation of the Strecker degradation products formaldehyde and acetaldehyde into the pentose moiety, forming the furanones HDMF and HEMF, respectively. The presence of C-12-HDMF, which was approximately 30% of the total HDMF amount found in xylose/glycine, indicates that HDMF is partly formed by sugar fragmentation. The proposed mechanism for the formation of the furanones is based on decomposition of the Amadori compound via 2,3-enolization, chain elongation by the Strecker aldehydes, and reduction of the resulting acetylformoin-type intermediates to the target molecules.