L-Valine CAS 72-18-4 (H-Val-OH) Assay 98.5~101.0% Factory High Quality

L-Valine (H-Val-OH) (CAS: 72-18-4) AJI 97 Mokhoa oa Teko
Identification: Bapisa spectrum ea infrared absorption ea sampole le ea standard by potassium bromide disc method.
Potoloho e Khethehileng [α]20/D: Mohlala o omisitsoeng, C=8, 6mol/L HCl
Boemo ba Tharollo (Transmittance): 0.5g ho 20ml ea H2O, spectrophotometer, 430nm, 10mm lisele tse botenya.
Chloride (Cl): 0.7g, A-1, ref: 0.40ml ea 0.01mol/L HCl
Ammonium (NH4): B-2
Sulfate (SO4): 1.2g, (1), ref: 0.50ml ea 0.005mol/L H2SO4
Tšepe (Fe): 1.5g, (2), ref: 1.5ml ea Iron Std.(0.01mg/ml)
Metals e boima (Pb): 2.0g, (2), ref: 2.0ml ea Pb Std.(0.01mg/ml)
Arsenic (As2O3): 2.0g, (2), ref: 2.0ml ea As2O3 Std.
Li-Amino Acids tse ling: Hlakola ammonia R2 Mohlala oa Teko: 50μg, F-6-a, taolo: L-Tyr 0.25μg
Tahlehelo ha o Omisa: ho 105 ℃ bakeng sa lihora tse 3.
Residue on Ignition (Sulfated): AJI Test 13
Tekanyetso: Mohlala o omisitsoeng, 120mg, (1), 3ml ea formic acid, 50ml ea glacial acetic acid, 0.1mol/L HCLO4 1ml = 11.715mg C5H11NO2
Teko ea pH: 1.0g ho 20ml ea H2O

L-Valine (H-Val-OH) (CAS: 72-18-4)JP16 Mokhoa oa Teko
L-Valine, ha e omisitsoe, ha e na ka tlase ho 98.5% ea C5H11NO2.
Tlhaloso L-Valine e hlaha e le likristale tse tšoeu kapa phofo ea kristale.Ha e na monko kapa e na le monko o fokolang, 'me e na le tatso e monate hanyenyane, e fetoha e babang.
E qhibiliha ka bolokolohi ka formic acid, e qhibiliha ka metsing, 'me e batla e sa qhibilihe ka har'a ethanol (95).
E qhibiliha ka ho hlapolla hydrochloric acid.
Identication Lekola sekhahla sa ho monya ha infrared sa L-Valine, se neng se omisitsoe pele, joalo ka ha se laetsoe ka mokhoa oa potassium bromide disk tlas'a Infrared Spectrophotometry <2.25>, 'me u bapise spectrum le Reference Spectrum: ka bobeli li bonts'a matla a ts'oanang a ho monya ka linomoro tse tšoanang tsa maqhubu. .
Potoloho ea mahlo <2.49> [a]20D: +26.5°~+29.0° (kamora ho omisa, 2 g, 6 mol/L hydrochloric acid TS, 25 mL, 100 mm).
pH <2.54> Qhala 0.5 g ya L-Valine ka 20 mL ya metsi: pH ya tharollo ena e pakeng tsa 5.5 le 6.5.
Bohloeki (1) Ho hlaka le 'mala oa tharollo Qhala 0.5 g ea L-Valine ka 20 mL ea metsi: tharollo e hlakile ebile ha e na mebala.
(2) Chloride <1.03> -Etsa tlhahlobo ka 0.5 g ea L-Valine.Lokisetsa tharollo ea taolo ka 0.30 mL ea 0.01mol/L hydrochloric acid VS (e seng ho feta 0.021%).
(3) Sulfate <1.14> -Etsa tlhahlobo ka 0.6 g ea L-Valine.Lokisetsa tharollo ea taolo ka 0.35 mL ea 0.005mol/L sulfuric acid VS (e seng ho feta 0.028%).
(4) Ammonium <1.02> -Etsa tlhahlobo ka 0.25 g ea L-Valine.Lokisetsa tharollo ea taolo ka 5.0 mL ea Standard Ammonium Solution (e seng ho feta 0.02%).
(5) Litšepe tse boima <1.07>-Tsoela pele ka 1.0 g ea L-Valine ho ea ka Mokhoa oa 1, 'me u etse tlhahlobo.Lokisetsa tharollo ea taolo ka 2.0 mL ea Standard Lead Solution (eseng ho feta 20 ppm).
(6) Arsenic <1.11> -Tsoela pele ka 1.0g ea L-Valine, lokisetsa tharollo ea teko ho latela Method 2, 'me u etse tlhahlobo (eseng ho feta 2 ppm).
(7) Lintho tse amanang-Hlakola 0.10 g ea L-Valine ka 25mL ea metsi, 'me u sebelise tharollo ena e le mohlala oa tharollo.Pipe 1 ml ea tharollo ea sampole, 'me u kenye metsi ho etsa 50 ml hantle.Pipete 5 ml ea tharollo ena, tšela metsi ho etsa 20 ml hantle, 'me u sebelise tharollo ena e le tharollo e tloaelehileng.Etsa tlhahlobo ka litharollo tsena joalokaha ho laetsoe tlas'a Thin-layer Chromatography <2.03>.Spot 5mL e 'ngoe le e 'ngoe ea tharollo ea mohlala le tharollo e tloaelehileng poleiting ea silika ea silika bakeng sa chromatography ea lera le tšesaane.Theha poleiti ka motsoako oa 1-butanol, metsi le acetic acid (100) (3:1:1) ho isa bohole ba 10 cm, 'me u omise poleiti ka 80℃ metsotso e 30.Fafatsa ka ho lekana tharollo ea ninhydrin ka har'a acetone (1 ho 50) poleiti, 'me mocheso ho 80 ℃ metsotso e 5: matheba ntle le letheba la mantlha ho tsoa ho tharollo ea sampole ha a matla ho feta sebaka se tsoang tharollong e tloaelehileng.
Tahlehelo ka ho omisa <2.41> Ha e fete 0.30% (1 g, 105℃,3 lihora).
Masalla ha a khantšitsoe <2.44> Ha a fete 0.1% (1 g).
Assay Beha boima bo nepahetseng ka 0.12 g ya L-Valine, e omisitsweng pele, mme e qhibidiha ka 3 mL ya formic acid, eketsa 50 mL ya acetic acid (100), le titrate <2.50> ka 0.1 mol/L perchloric acid VS (potentiometric titration) .Etsa qeto e se nang letho, 'me u etse tokiso e hlokahalang.
ML ka 'ngoe ea 0.1 mol/L perchloric acid VS＝11.72 mg ea C5H11NO2
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