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

ʻO ka L-Aspartic Acid, ke maloʻo, ʻaʻole i emi iho ma mua o 98.5% a ʻaʻole ʻoi aku ma mua o 101.0% o L-Aspartic Acid (C4H7NO4).
Hōʻike ʻia ʻo L-Aspartic Acid e like me ke keʻokeʻo, ka pauka orcrystalline kristal.ʻAʻole hiki ke hoʻoheheʻe ʻia i ka wai, a hiki ʻole ke hoʻoheheʻe ʻia i ka ethanol (99.5).Hoʻoheheʻe ia i loko o ka waika hydrochloric dilute a me 0.2 mol/L sodium hydroxide TS.
Identification E hoʻoholo i ka spectrum absorption infrared o L-Aspartic Acid e like me ke kuhikuhi ʻana ma ke ʻano pāpaʻi bromide pāpaʻa ma lalo o Infrared Spectrophotometry <2.25>, a e hoʻohālikelike i ke kikoʻī me ka Spectrum Reference: hōʻike nā spectrae ʻelua i ka ikaika like o ka absorption ma nā helu nalu like.
ʻO ka huli ʻana o ka Optical <2.49> [a]20D: +24.0~+26.0° (2 g, ma hope o ka maloʻo ʻana, 6 mol/L hydrochloric acid TS, 25 mL, 100 mm).
pH <2.54> E hoʻoheheʻe i 0.4 g o ka L-Aspartic Acid i loko o 100 mL o ka wai ma ka hoʻomehana ʻana, a ʻae e hoʻomāalili: ma waena o 2.5 a me 3.5.
Maʻemaʻe (1) Ka māmā a me ka waihoʻoluʻu o ka hoʻonā-E hoʻoheheʻe i ka 1.0 g o ka L-Aspartic Acid i 20 mL o 1 mol/L hydrochloric acid TS: he akaka a kala ʻole ka hopena.
(2) Chloride <1.03>-E hoʻoheheʻe i 0.5 g o ka L-Aspartic Acid i 6 mL o ka waikawa nitric dilute a me 20 mL o ka wai, e hoʻohui i ka wai e hana i 50 mL, a e hana i ka hoʻāʻo me kēia hoʻonā e like me ka hopena hoʻāʻo.E hoʻomākaukau i ka hoʻonā mana me ka 0.30 mL o 0.01 mol/L hydrochloric acid VS (ʻaʻole ʻoi aku ma mua o 0.021%).
(3) Sulfate <1.14>-E hoʻoheheʻe i 0.6 g o ka L-Aspartic Acid i loko o 5 mL o ka waikawa hydrochloric dilute a me 30 mL o ka wai, e hoʻohui i ka wai e hana i 45 mL, a hoʻohui i 5 mL o ka barium chloride TS.Hana i ka ho'āʻo me kēia hoʻonā e like me ka hoʻonā ho'āʻo.E hoʻomākaukau i ka hopena hoʻomalu me 0.35 mL o 0.005 mol/L sulfuric acid VS, e hoʻohui i 5 mL o ka waika hydrochloric dilute a me ka wai e hana i 45 mL, a hoʻohui i 5 mL o ka barium chloride (ʻaʻole iʻoi aku ma mua o 0.028 ~).
(4) Ammonium<1.02>—E hana i ka hoao me 0.25 g o ka L-Aspartic Acid.E hoʻomākaukau i ka hoʻonā hoʻomalu me 5.0 mL o ka Haʻina Ammonium maʻamau (ʻaʻole ʻoi aku ma mua o 0.02z)
(5) Nā Metala Kaumaha <1.07>-E hoʻomau me 1.0 g o ka L-Aspartic Acid e like me ke ʻano 4, a hana i ka hoʻāʻo.E hoʻomākaukau i ka hoʻonā hoʻomalu me 1.0 mL o ka ʻOi (ʻaʻole ʻoi aku ma mua o 10 ppm).
(6)Iron <1.10>-E hoʻomākaukau i ka hopena ho'āʻo me 1.0 g o ka L-Aspartic Acid e like me keʻano 1, a hana i ka hōʻike e like me keʻano A. E hoʻomākaukau i ka hoʻonā mana me 1.0 mL o ka Iron Solution (ʻaʻole iʻoi aku ma mua o 10 ppm).
(7) Nā mea pili-E hoʻoheheʻe i 0.20 g o L-AsparticAcid i 10 mL o 0.2 mol/L sodium hydroxide TS, a hoʻohana i kēia hoʻonā e like me ka hāpana hāpana.Pipet 1 mL o ka hāpana hāpana, hoʻohui i ka wai e hana pono i 10 mL.Pipet 1 mLof keia solution, e hookomo i ka wai e hana pono i 50 mL, a e hoohana i keia solution ma ke ano o ka solution ma'amau.Hana i ka ho'āʻo me kēia mau haʻina e like me ke kuhikuhi ʻana ma lalo o Thin-layer Chromatogra-phy<2.03>.E kau i ka 5mL o kēlā me kēia o ka hāpana hāpana a me ka hoʻonā kū ma luna o kahi pā silica gel no ka chromatog-raphy lahilahi, e hoʻomohala me ka hui ʻana o ka 1-butanol, ka wai a me ka aceticacid (100) (3:1:1) i kahi. ka mamao ma kahi o 10 cm, a maloʻo i ka pā ma 809C no 30 mau minuke.E pāpaʻi like i ka hopena o nin-hydrin i loko o ka hui ʻana o ka methanol a me ka acetic acid (100) (97:3)(1 in 100), a me ka wela ma 80 ℃ no 10 mau minuke: kahi ʻokoʻa ma waho o ka wahi nui i loaʻa me ka hāpana. ʻAʻole ʻoi aku ka ikaika o ka hoʻonā ma mua o ka wahi i loaʻa me ka hoʻonā maʻamau.
ʻAʻole ʻoi aku ma mua o 0.30% (1 g, 105℃,3 hola).
ʻAʻole i ʻoi aku ma mua o 0.1% (1 g).
ʻIke pono e kaupaona pololei ma kahi o 0.15 g o ka L-Aspartic Acid, i hoʻomaloʻo mua ʻia, e hoʻoheheʻe i loko o 50 mL o ka wai ma ka hoʻomehana ʻana.Ma hope o ka hoʻoluʻu ʻana, hoʻokaʻawale i ka <2.50> me 0.1 mo/L sodium hydroxide VS (potentiometric titration).E hana i kahi hoʻoholo hakahaka ma ke ʻano like, a hana i nā hoʻoponopono e pono ai.
ʻO kēlā me kēia mL o 0.1 mol/L sodium hydroxide VS＝13.31 mg o C4H7NO4
ʻO nā pahu a me ka mālama ʻana i nā pahu pahu-paʻa paʻa.