L-Aspartic Acid CAS 56-84-8 (H-Asp-OH) Assay 98.5~101.0% Factory High Quality

L-Aspartic Acid, ha e omisitsoe, ha e na ka tlase ho 98.5% le ho feta 101.0% ea L-Aspartic Acid (C4H7NO4).
Tlhaloso L-Aspartic Acid e hlaha e le phofo e tšoeu, kristale kapa crystalline.E qhibiliha hanyenyane metsing, 'me e batla e sa qhibilihe ka har'a ethanol (99.5).E qhibiliha ka ho hlapolla hydrochloric acid le ho 0.2 mol/L sodium hydroxide TS.
Identification Netefatsa infrared absorption spectrum ea L-Aspartic Acid joalokaha e laetsoe ka potassium bromide disk mokhoa tlas'a Infrared Spectrophotometry <2.25>, 'me bapisa spectrum le Reference Spectrum: ka bobeli spectraexhibit matla a tšoanang a ho monya ka linomoro tsa maqhubu a tšoanang.
Optical rotation <2.49> [a]20D: +24.0~+26.0 ° (2 g, ka mor'a ho omisa, 6 mol / L hydrochloric acid TS, 25 mL, 100 mm).
pH <2.54> Qhala 0.4 g ya L-Aspartic Acid ka 100 ml ya metsi ka ho futhumala, mme o dumella ho fola: pakeng tsa 2.5 le 3.5.
Bohloeki (1) Ho hlaka le 'mala oa tharollo-Hlakola 1.0 g ea L-Aspartic Acid ka 20 mL ea 1 mol / L hydrochloric acid TS: tharollo e hlakile ebile ha e na mebala.
(2) Chloride <1.03>-Dissolve 0.5 g ya L-Aspartic Acid ka 6 mL ya dilute nitric acid le 20 ml ya metsi, eketsa metsi ho etsa 50 mL, mme o etse teko ka tharollo ena e le tharollo ya teko.Lokisetsa tharollo ea taolo ka 0.30 mL ea 0.01 mol/L hydrochloric acid VS (e seng ho feta 0.021%).
(3) Sulfate <1.14>-Tlosa 0.6 g ya L-Aspartic Acid ka 5 mL ea dilute hydrochloric acid le 30 ml ea metsi, eketsa metsi ho etsa 45 mL, ebe u eketsa 5 mL ea barium chloride TS.Etsa tlhahlobo ka tharollo ena e le tharollo ea teko.Lokisetsa tharollo ea taolo ka 0.35 mL ea 0.005 mol/L sulfuric acid VS, eketsa 5 mL ea dilute hydrochloric acid le metsi ho etsa 45 mL, ebe u eketsa 5 mL ea barium chloride (eseng ho feta 0.028 ~).
(4) Ammonium<1.02>—Etsa tlhahlobo ka 0.25 g ea L-Aspartic Acid.Lokisetsa tharollo ea taolo ka 5.0 mL ea Standard Ammonium Solution (e seng ho feta 0.02z)
(5) Metals e boima <1.07> -Tsoela pele ka 1.0 g ea L-Aspartic Acid ho ea ka Mokhoa oa 4, 'me u etse tlhahlobo.Lokisetsa tharollo ea taolo ka 1.0 mL ea Standard Lead Solution (eseng ho feta 10 ppm).
(6) Iron <1.10> -Lokisetsa tharollo ea teko ka 1.0 g ea L-Aspartic Acid ho ea ka Method 1, 'me u etse test ho ea ka Mokhoa oa A. Lokisetsa tharollo ea taolo ka1.0 mL ea Standard Iron Solution (e seng ho feta 10 ppm).
(7) Lintho Tse Amanang-Tlosa 0.20 g ea L-AsparticAcid ka 10 mL ea 0.2 mol / L sodium hydroxide TS, 'me u sebelise tharollo ena e le mohlala oa tharollo.Pipete 1 ml ea tharollo ea sampole, eketsa metsi ho etsa 10 ml hantle.Pipete 1 mLof tharollo ena, eketsa metsi ho etsa 50 mL hantle, 'me u sebelise tharollo ena e le tharollo e tloaelehileng.Etsa tlhahlobo ka litharollo tsena joalokaha ho laetsoe tlas'a Thin-layer Chromatogra-phy<2.03>.Spot 5mL e 'ngoe le e 'ngoe ea tharollo ea sampole le tharollo e emeng poleiting ea gel ea silica bakeng sa chromatog-raphy, e hlahisoa ka motsoako oa 1-butanol, metsi le aceticacid (100) (3:1:1) ho isa ho sebaka se ka bang 10 cm, 'me sejana se omeletseng ho 809C metsotso e 30.Fafatsa ka ho lekana motsoako oa nin-hydrin motsoakong oa methanol le acetic acid (100) (97:3) (1 ho 100), le mocheso ho 80 ℃ metsotso e 10: sebaka se seng ntle le sebaka se ka sehloohong se fumanoeng ka sampole. tharollo ha e matla ho feta sebaka se fumanoang ka tharollo e tloaelehileng.
Tahlehelo ka ho Omisa <2.41> Ha e fete 0.30% (1 g, 105℃,3 lihora).
Masalla a ho Ignition <2.44> Ha a fete 0.1% (1 g).
Assay Beha boima bo nepahetseng ka 0.15 g ea L-Aspartic Acid, e neng e omisitsoe pele, qhala ka 50 ml ea metsi ka ho futhumala.Ka mor'a ho pholile, titrate <2.50> ka 0.1 mo / L sodium hydroxide VS (potentiometric titration).Etsa qeto e se nang letho ka mokhoa o ts'oanang, 'me u etse tokiso e hlokahalang.
ML ka 'ngoe ea 0.1 mol/L sodium hydroxide VS＝13.31 mg ea C4H7NO4
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