L-Aspartic Acid CAS 56-84-8 (H-Asp-OH) Assay 98.5 ~ 101.0% Hoobkas Zoo

L-Aspartic Acid, thaum qhuav, muaj tsis pub tsawg tshaj 98.5% thiab tsis ntau tshaj 101.0% ntawm L-Aspartic Acid (C4H7NO4).
Nqe lus piav qhia L-Aspartic Acid tshwm sim li dawb, muaju los yog crystalline hmoov.Nws yog sparingly soluble hauv dej, thiab xyaum insoluble hauv ethanol (99.5).Nws yaj hauv dilute hydrochloric acid thiab hauv 0.2 mol / L sodium hydroxide TS.
Kev txheeb xyuas Kev txiav txim siab qhov infrared absorption spectrum ntawm L-Aspartic Acid raws li qhia nyob rau hauv cov poov tshuaj bromide disk txoj kev nyob rau hauv Infrared Spectrophotometry <2.25>, thiab muab piv cov spectrum nrog cov Reference Spectrum: ob qho tib si spectraexhibit zoo sib xws ntawm kev nqus ntawm tib yoj tooj.
Kev sib hloov kho qhov muag <2.49> [a]20D: +24.0 ~ + 26.0 ° (2 g, tom qab ziab, 6 mol / L hydrochloric acid TS, 25 mL, 100 mm).
pH <2.54> Dissolve 0.4 g ntawm L-Aspartic Acid hauv 100 mL dej los ntawm kev ua kom sov, thiab cia kom txias: nruab nrab ntawm 2.5 thiab 3.5.
Purity (1) Clarity thiab xim ntawm cov kua - Dissolve 1.0 g ntawm L-Aspartic Acid nyob rau hauv 20 mL ntawm 1 mol / L hydrochloric acid TS: cov tshuaj yog ntshiab thiab tsis muaj xim.
(2) Chloride <1.03>- Dissolve 0.5 g ntawm L-Aspartic Acid hauv 6 mL ntawm dilute nitric acid thiab 20 mL dej, ntxiv dej los ua 50 mL, thiab ua qhov kev sim nrog cov tshuaj no raws li kev sim tshuaj.Npaj cov tshuaj tswj nrog 0.30 mL ntawm 0.01 mol / L hydrochloric acid VS (tsis ntau tshaj 0.021%).
(3) Sulfate <1.14>- Dissolve 0.6 g ntawm L-Aspartic Acid nyob rau hauv 5 mL ntawm dilute hydrochloric acid thiab 30 mL dej, ntxiv dej kom 45 mL, thiab ntxiv 5 mL ntawm barium chloride TS.Ua qhov kev sim nrog qhov kev daws teeb meem no raws li kev sim tshuaj.Pre-pare cov tshuaj tswj nrog 0.35 mL ntawm 0.005 mol / L sulfuric acid VS, ntxiv 5 mL ntawm dilute hydrochloric acid thiab dej kom 45 mL, thiab ntxiv 5 mL ntawm barium chloride (tsis ntau tshaj 0.028 ~).
(4) Ammonium <1.02>—Ua qhov ntsuas nrog 0.25 g ntawm L-Aspartic Acid.Npaj cov tshuaj tswj nrog 5.0 mL ntawm Standard Ammonium Solution (tsis ntau tshaj 0.02z)
(5) Cov Hlau Hnyav <1.07>-Tau nrog 1.0 g ntawm L-Aspartic Acid raws li Txoj Kev 4, thiab ua qhov kev sim.Npaj cov tshuaj tswj nrog 1.0 mL ntawm Standard Lead Solution (tsis ntau tshaj 10 ppm).
(6) Hlau <1.10>-Npaj cov tshuaj ntsuam xyuas nrog 1.0 g ntawm L-Aspartic Acid raws li txoj kev 1, thiab ua cov testaccording rau txoj kev A. Npaj cov tshuaj tswj nrog 1.0 mL ntawm Standard Iron tov (tsis ntau tshaj 10). ppm).
(7) Lwm Yam-Dissolve 0.20 g ntawm L-AsparticAcid nyob rau hauv 10 mL ntawm 0.2 mol / L sodium hydroxide TS, thiab siv cov tshuaj no raws li cov qauv tov.Pipet 1 mL ntawm cov qauv tov, ntxiv dej kom raws nraim 10 mL.Pipet 1 mLof cov tshuaj no, ntxiv dej kom raws nraim 50 mL, thiab siv cov tshuaj no raws li tus qauv tov.Ua qhov kev sim nrog cov kev daws teeb meem no raws li qhia hauv Thin-txheej Chromatogra-phy <2.03>.Spot 5mL txhua tus qauv tshuaj thiab cov tshuaj sawv ntsug ntawm ib lub phaj ntawm silica gel rau nyias txheej chromatog-raphy, tsim nrog kev sib xyaw ntawm 1-butanol, dej thiab aceticacid (100) (3: 1: 1) nyob deb li ntawm 10 cm, thiab qhuav lub phaj ntawm 809C rau 30 feeb.Spray tusyees ib tug tov ntawm nin-hydrin nyob rau hauv ib tug sib tov ntawm methanol thiab acetic acid (100) (97:3) (1 nyob rau hauv 100), thiab tshav kub ntawm 80 ℃ rau 10 feeb: qhov chaw uas tsis yog lub ntsiab qhov chaw tau nrog cov qauv kev daws tsis yog khaus ntau dua li qhov chaw tau nrog cov txheej txheem daws teeb meem.
Poob rau ziab <2.41> Tsis pub ntau tshaj 0.30% (1 g, 105 ℃, 3 teev).
Residue ntawm Ignition <2.44> Tsis ntau tshaj 0.1% (1 g).
Assay Weigh kom meej txog 0.15 g ntawm L-Aspartic Acid, yav tas los qhuav, yaj hauv 50 mL dej los ntawm kev ua kom sov.Tom qab txias, titrate <2.50> nrog 0.1 mo/L sodium hydroxide VS (potentiometric titration).Ua ib qho kev txiav txim siab dawb paug ib yam nkaus, thiab ua kom muaj kev kho qhov tsim nyog.
Txhua mL ntawm 0.1 mol / L sodium hydroxide VS ＝13.31 mg ntawm C4H7NO4
Containers thiab cia Containers-Tight containers.