L-Cysteine ​​CAS 52-90-4 (H-Cys-OH) Kuongorora 98.5~101.0% (Titration) Factory High Quality

L-Cysteine ​​ine kwete pasi pe98.5% uye kwete kupfuura 101.0% yeL-Cysteine ​​​​(C3H7NO2S), yakaverengerwa pane yakaomeswa nheyo.
Tsanangudzo L-Cysteine ​​inowanikwa semakristasi machena kana chena crystalline poda.Iine unhu hwemunhuwi uye kunhuhwirira kunopinza.Inonyungudika zvakasununguka mumvura, uye inenge isinganyungudike mu ethanol (99.5).Inonyungudika mu1 mol/L hydrochloric acid TS.
Kuzivikanwa Sarudza iyo infrared absorption spectrum yeL-Cysteine ​​sezvainotungamirwa mu potassium bromide disk nzira pasi peInfrared Spectrophotometry <2.25>, uye enzanisa spectrum neReferensi Spectrum: zvose zvinoratidzira zvinoratidzira kusimba kwakafanana kwekunyura panhamba imwechete yemafungu.
Optical rotation <2.49> [a]20D:+8.0 ~+10.0° (2 g inoverengwa pahwaro hwakaomeswa, 1 mol/L hydrochloric acid TS, 25mL, 100 mm).
pH <2.54> Iyo pH yemushonga wakagadzirirwa nekunyungudutsa 1.25 g yeL-Cysteine ​​mu 50 mL yemvura ndeye 4.7 kusvika 5.7.
Kuchena (1) Kujeka uye ruvara rwemhinduro-Dissolve 1.0 g yeL-Cysteine ​​mu 20 mL yemvura: mhinduro yakajeka uye isina ruvara.
(2) Chloride <1.03>-Dissolve 0.30 g yeL-Cysteine ​​mu 10mL ye diluted nitric acid (1 mu 4), wedzera 10mL yehydrogenperoxide (30), kupisa kwemaminitsi makumi maviri mumvura inofashaira yekugeza, inotonhorera, wobva wawedzera mvura kuita 50 mL.Ita bvunzo uchishandisa iyi mhinduro seyeyedzo mhinduro.Gadzirira mhinduro ine 0.35 mL ye0.01 mol/L hydrochloric acid VS (kwete kupfuura 0.041%).
(3) Sulfate <1.14>-Dissolve 0.6 g yeL-Cysteine ​​mu 30 mL yemvura uye 3 mL ye dilute hydrochloric acid, woisa mvura kuita 50 mL.Ita bvunzo uchishandisa iyi mhinduro seyeyedzo mhinduro.Gadzirira mhinduro yekudzora sezvinotevera: Ku 0.35 mL ye 0.005 mol/L sulfuric acid VS wedzera 3 mL ye dilute hydrochloric acid uye mvura kuti uite 50 mL.Gadzirira mhinduro yebvunzo uye mhinduro yekutonga ne 4 mL ye barium chloride TS, zvichiteerana (kwete kupfuura 0.028%).
(4) Ammonium <1.02> -Ita bvunzo ne 0.25 g yeL-Cysteine, uchishandisa distillation pasi pekumanikidzwa kwakaderedzwa.Gadzirira mhinduro yekutonga ne 5.0 mL yeStandard Ammonium Solution (kwete kupfuura 0.02%).
(5) Heavy Metals <1.07>-Enda ne 1.0g yeL-Cysteine ​​maererano neMethod 4, uye ita muedzo.Gadzirira sarudzo yekutonga ne 1.0 mL ye Standard Lead Solution (kwete kupfuura 10 ppm).
(6) Iron <1.10> -Gadzirira mhinduro yekuedza ne 1.0 g yeL-Cysteine ​​maererano neMethod 1, uye ita muedzo maererano neMethod A. Gadzirira sarudzo yekutonga ne 1.0mL yeStandard Iron Solution (kwete kupfuura 10 ppm )
(7)Zvinhu Zvinoenderana-Dissolve 0.10 g yeL-Cysteine ​​muN-ethylmaleimide solution (1 mu50) kuita 10 mL chaiyo, siya kwemaminetsi makumi matatu, uye shandisa mhinduro iyi semuenzaniso wemhinduro.Pipeti 1 mL yemushonga wemhinduro, wedzera mvura kuita 10 mL chaiyo, pipet 1 mL yemhinduro iyi, wedzera mvura kuita 50 mL chaiyo, uye shandisa mhinduro iyi seyakajairwa mhinduro (1).Neparutivi, nyungudutsa 0.10 g yeL-cystine mu 0.5mol/L hydrochloric acid TS kuti iite 20 mL chaiyo.Pombi 1mL yemushonga uyu, wedzera mvura kuita 100 mL, uye shandisa mhinduro iyi seyakajairwa mhinduro (2).Ita bvunzo nemhinduro idzi sekurairwa pasi peThin-layer Chromatography <2.03>.Spot 10mL yega yega yemuenzaniso mhinduro uye yakajairwa mhinduro (1) uye (2) pandiro yesilica gel yeitete-layer chromatography.Gadzira ndiro nemusanganiswa we1-butanol, mvura, neacetic acid (100) (3:1:1) kusvika chinhambwe chingangoita masendimita gumi, woomesa ndiro yacho kwemaminitsi makumi matatu pa809C.Pfaya ndiro yacho zvakaenzana nemhinduro. ye ninhydrin mumusanganiswa we methanol uye acetic acid (100) (97: 3) (1 mu100), uyezve kupisa pa80 ℃ kwemaminetsi gumi: nzvimbo inowanikwa kubva mumuenzaniso mhinduro inoenderana nenzvimbo yakawanikwa kubva kune yakajairwa mhinduro. (2) haina kusimba kupfuura nzvimbo kubva kune yakajairwa mhinduro (2).Zvakare, makwapa kunze kwenzvimbo huru uye makwapa ataurwa pamusoro kubva mumuenzaniso mhinduro haana kusimba kupfuura nzvimbo kubva kune yakajairwa mhinduro (1).
Kurasikirwa paKuomesa <2.41> Kwete kupfuura 0.50% (1 g, muvacuum, phosphorus (V) oxide, maawa matatu).
Residue paIgnition <2.44> Kwete kupfuura 0.1%(1 g).
Assay Weresa nemazvo nezve 0.2 g yeL-Cysteine, isa itin muflask yakamiswa, uye inyonya mu20 mL yemvura.Dissolve 4 g ye potassium iodide mumhinduro iyi, pakarepo isa mumvura inotonhora yechando, woisa 5 mL ye dilute hydrochloric acid uye chaiyo 25 mL ye 0.05 mol/L iodine VS, siya munzvimbo ine rima kwemaminitsi makumi maviri, uye ipapo titrate <2.50 > kuwanda kweiodine ine 0.1 mol/L sodium thiosulfate VS (chiratidzo: starch TS).Ita shumo isina chinhu uchishandisa nzira imwechete.
Imwe mL ye0.05 mol/L ayodhini VS＝12.12 mg yeC3H7NO2S
Containers uye Storage Containers-Tight midziyo.