L-Phenylalanine CAS 63-91-2 (H-Phe-OH) Kev Ntsuam Xyuas 98.5 ~ 101.5% Lub Hoobkas Zoo

L-Phenylalanine, thaum qhuav, muaj tsis pub tsawg tshaj 98.5% ntawm C9H11NO2.
Nqe lus piav qhia L-Phenylalanine tshwm sim li dawb muaju los yog crystalline hmoov.Nws yog odorless los yog muaj ib tug faint yam ntxwv tsw, thiab muaj ib tug me ntsis iab saj.Nws yog dawb do soluble nyob rau hauv formic acid, sparingly soluble nyob rau hauv dej, thiab xyaum insoluble nyob rau hauv ethanol (95).Nws dissolves nyob rau hauv dilute hydrochloride acid.
Kev txheeb xyuas Kev txheeb xyuas qhov infrared absorption spectrum ntawm L-Phenylalanine, yav tas los qhuav, raws li qhia nyob rau hauv cov poov tshuaj bromide disk txoj kev nyob rau hauv Infrared Spectrophotometry <2.25>, thiab sib piv cov spectrum nrog rau cov ntaub ntawv Spectrum: ob qho tib si spectra qhia zoo ib yam li siv zog nqus ntawm tib yoj tooj. .
Optical Rotation <2.49> [a]D20: -33.0 ° rau -35.59 ° (tom qab ziab, 0.5 g, dej, 25 mL, 100 mm).
pH <2.54> Dissolve 0.20 g ntawm L-Phenylalanine hauv 20 mL dej: pH ntawm cov tshuaj no yog nyob nruab nrab ntawm 5.3 thiab 6.3
Purity (1) Clarity thiab xim ntawm cov kua - Dissolve 0.5 g ntawm L-Phenylalanine nyob rau hauv 10 mL ntawm 1 mol hydrochloric acid TS: cov tshuaj yog ntshiab thiab tsis muaj xim.
(2) Chloride <1.03>- Ua qhov kev sim nrog 0.5 g ntawm L-Phenylalanine.Npaj cov tshuaj tswj nrog 0.30 mL ntawm 0.01 mol / L hydrochloride acid VS (tsis ntau tshaj 0.021%).
(3) Sulfate <1.14>- Ua qhov kev sim nrog 0.6 g ntawm L-Phenylalanine.Npaj cov tshuaj tswj nrog 0.35 mL ntawm 0.005 mol / L sulfuric acid VS (tsis ntau tshaj 0.028z).
(4) Ammonium <1.02>-Ua qhov ntsuas nrog 0.25 g ntawm L-Phenylalanine.Npaj cov tshuaj tswj nrog 5.0 mL ntawm Standard Ammonium Solution (tsis ntau tshaj 0.02%).
(5) Heavy Metals <1.07>- Dissolve 1.0 g ntawm L-Phenylalanine hauv 40 mL dej thiab 2 mL ntawm dilute acetic acid los ntawm kev sov, txias, thiab ntxiv dej kom 50 mL.Ua qhov kev sim siv qhov kev daws teeb meem no raws li qhov kev sim tshuaj.Npaj cov tshuaj raws li nram no: mus rau 2.0 mL ntawm Standard Lead Solution ntxiv 2 mL ntawm dilute acetic acid thiab dej kom 50 mL (tsis ntau tshaj 20 ppm).
(6) Arsenic <1.11>- Dissolve 1.0 g ntawm L-Phenylalanine hauv 5 mL ntawm dilute hydrochloride acid thiab 15 mL dej, thiab ua qhov kev sim nrog cov tshuaj no raws li cov tshuaj ntsuam xyuas (tsis ntau tshaj 2 ppm).
(7) Lwm Yam Khoom-Dissolve 0.10 g ntawm L-Phenylalanine hauv 25 mL dej, thiab siv cov tshuaj no ua cov qauv tov.Pipet 1 mL ntawm cov qauv tov, thiab ntxiv dej kom raws nraim 50 mL.Pipet 5 mL ntawm cov tshuaj no, ntxiv dej kom raws nraim 20 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 Chromatography <2.03>.Spot 5mL txhua yam ntawm cov qauv kev daws teeb meem thiab cov qauv kev daws teeb meem ntawm lub phaj ntawm silica gel rau nyias txheej chromatography.Tsim lub phaj nrog sib tov ntawm 1-butanol, dej thiab acetic acid (100) (3: 1: 1) kom deb li deb ntawm 10 cm, thiab qhuav lub phaj ntawm 809Cfor30minutes.Txau tus nqi sib npaug ntawm ninhydrin hauv acetone (1 in50) ntawm lub phaj, thiab cua sov ntawm 80 ℃ rau 5 feeb: qhov chaw uas tsis yog lub hauv paus ntsiab lus ntawm cov qauv tshuaj tsis yog khaus ntau dua li qhov chaw los ntawm cov qauv kev daws teeb meem.
Poob rau ziab <2.41> Tsis ntau tshaj 0.30% (1 g, 105 ℃, 3 teev).
Residue ntawm Ignition <2.44> Tsis ntau tshaj 0.10% (1 g).
Assay Weigh raug hais txog 0.17 g ntawm L-Phenylalanine, yav tas los qhuav, thiab yaj hauv 3 mL ntawm formic acid, ntxiv 50mL ntawm acetic acid (100), thiab titrate <2.50> nrog 0.1 mol / L perchloric acid VS (potentiometric titration).Ua ib qho kev txiav txim siab dawb paug, thiab ua ib qho kev kho uas tsim nyog.
Txhua mL ntawm 0.1 mol / L perchloric acid VS ＝16.52 mg ntawm C9H11NO2
Containers thiab cia Containers-Tight containers.