1 Molecular formula C2HsNO2
            2 Molecular weight 75.07
            3 Physical—chemistry property:White monoclinic crystcl or hexagonal crystal or white 
            crystalline powder .Odourless with special sweet taste. Relative density is 1.1607.
            melting point is 
            248 .(dissolve)  Pk’1(COOH)is 2.34,  Pk’2(N+H3)  is 9.60. Soluble in 
            water,and Solubility is 25℃,25g/100ml:50℃,39.1g/100ml:75℃,54.4g/100ml:100℃,67.2g/
            100ml.hardly soluble in ethanol and solubility is 0.06g in 100g ethanol absolute hardly 
            soluble inAcetone and diethyl enther. React with hydrochloric and become hydrochloride.
            pH(50g/l solution,25℃)=5.5~7.0
            4 Mainly usage:1.Used as the medicine material in study of amino acid metabolism for medical
            microbiology and blological chemistry.2.Used as the amino acid synthetic source of aureomycin
            buffer,antipakinsonism agent,L—dopa,vitamin B6 and threonine.3.Used as nutritional transfusion
            of amino acid.4.Used as the material for cephalosporin,and intermediate for synthesis of imidazole
            Acetic.5.Used as the material for cosmetics.
            5 Qualit specification:
            1 American Pharmacopoeia 34th
            Identification test:infrared spectra test up to standar
            Assay                                      98.5~101.5%
            Chloride(CI)                            ≦0.007%
            Heavy metal(Pb)                     ≦0.0020%
            Loss on drying                        ≦0.20%
            Residue on ignition                 ≦0.10%
            Sulfated  ash                           ≦0.0065%
            Readily hydrolsable substance      up to standard
            2.European Pharmacopoeia 7.0 edition
            Dentification test:
            Infrared spectrum test             up to standard
            Positive ninhydrin                    ≦0.50%
            Assday                                    98.5~101.5%
            Chloride(CI)                             ≦0.0075%
            Heavy metal(Pb)                      ≦0.001%
            Loss on drying                         ≦0.50%
            Sulfated  ash                            ≦0.10% 
            Ph value                                   5.9~6.4
            Appearance of solution             clear and not in shade deeper than
            Contrast solution 
            Appearance                               white crystallin powder
            Solubility                                    readily dissolve in water,slghtly dissolve
            In alcohol(96%),showing polymorphism                   
            3.National Pharmacopoeia of China 2010 Edition. 2nd part
            Appearance                              white crystalline powder
            Solubility                                    readily dissolve in water,hardly dissolve in diethyl and Ethanol
            Identification test (infrared spectra test)  up to standard
            PH value                                           5.6~6.5
            Light transmittance of solution    ≦98.0%
            Assay                                                ≦99.0%
            Chloride(CI)                               ≦0.007%
            Sulfated ash                                   ≦0.006%
            Ammonium salt                          ≦0.02%

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