D-(+)-Xylose CAS 58-86-6 Maʻemaʻe >99.5% (HPLC) Hale Hana Mea Kiʻekiʻe

ʻAʻole i emi iho ka Xylose ma lalo o 98.0 pākēneka a ʻaʻole ʻoi aku ma mua o 102.0 pākēneka o C5H10O5, i helu ʻia ma ke kumu maloʻo.
Packaging a me ka mālama ʻana-E mālama i loko o nā pahu paʻa i ka lumi wela.
Nā kūlana hōʻike USP <11>-
USP Fructose RS
USP Xylose RS
Ka waihoʻoluʻu o ka hāʻina-ʻO kahi hāʻina hou i hoʻomākaukau ʻia (1 i ka 10) he akaka a kala ʻole.
ʻike-
A: Infrared Absorption <197A>.
B: ʻO ka manawa paʻa o ka piko nui ma ka chromatogram o ka hoʻomākaukau Assay e pili ana i kēlā i loko o ka chromatogram o ka hoʻomākaukau maʻamau, e like me ka loaʻa ʻana ma ka Assay.
Ka hoʻololi kikoʻī <781S>: ma waena o +18.2° a me +19.4°.
ʻO ka hopena hoʻāʻo: 100 mg no ka mL, ma 0.012 N ammonium hydroxide.
Pohō ma ka maloʻo <731>-Moloo 2 g a 5 g ma ke kaomi ʻaʻole ʻoi aku ma mua o 50 mm o ka mercury ma 60° i ke kaumaha mau, hele ʻia kahi ea maloʻo i ka umu i ka wā maloʻo e wehe i ka mahu wai: nalowale. ʻaʻole iʻoi aku ma mua o 0.1% o kona kaumaha.
Ke koena ma ka ʻā ʻana <281>: ʻaʻole ʻoi aku ma mua o 0.05%.
Hao <241>-E hoʻoheheʻe i 2.0 g i 45 mL o ka wai, a hoʻohui i 2 mL o ka waikawa hydrochloric: ʻo ka palena he 5 ppm.
Nā metala kaumaha <231>-E hoʻoheheʻe i 2.0 g i ka wai e hana i 25 mL o ka hopena: ʻo ka palena he 0.001%.
Chromatographic maʻemaʻe-E hoʻohana i ka chromatogram o ka hoʻomākaukau Assay, i loaʻa e like me ke kuhikuhi ʻana i ka Assay.E helu i ka pākēneka o kēlā me kēia haumia, me ka ʻole o nā piko solvent, ma ka hapa o Xylose i lawe ʻia:
100(ri / rS)
i loko o ka ri ka pane o kēlā me kēia haumia;a ʻo rS ka huina o nā pane a pau i loko o ka chromatogram: ʻaʻole i ʻoi aku ma mua o 1.0% o kēlā me kēia haumia i loaʻa, a ʻo ka huina o nā mea haumia a pau i loaʻa ʻaʻole i ʻoi aku ma mua o 2.0%.
hoʻāʻo-
ʻĀpana Mobile-E hoʻohana i ka hui ʻana o ka acetonitrile a me ka wai (75:25).
ʻO ka hoʻonā kūpono o ka ʻōnaehana-E hoʻomākaukau i kahi hopena ma ka pae Mobile, aia ma kahi o 10 mg o USP Xylose RS a me 0.2 mg o USP Fructose RS no mL.
Hoʻomākaukau maʻamau-E hoʻopau i ka nui o ka USP Xylose RS i kaupaona pono ʻia ma ka pae Mobile no ka loaʻa ʻana o kahi hopena i ʻike ʻia ma kahi o 10 mg no ka mL.
Hoʻomākaukau hoʻāʻo-E hoʻoneʻe ma kahi o 100 mg o Xylose, i kaupaona pololei ʻia, i kahi pahu volumetric 10-mL, hoʻoheheʻe i loko a hoʻoheheʻe ʻia me ka pae Mobile i ka leo, a hui.
Pūnaehana Chromatographic (e nānā i ka Chromatography <621>)-Ua hoʻolako ʻia ka chromatograph wai me kahi mea ʻike 192-nm a me kahi kolamu 4.6-mm × 15-cm i loaʻa i ka packing L8.Mālama ʻia ka mahana o ke kolamu ma 30 °, a ʻo ka kahe kahe e pili ana i 2 mL i kēlā me kēia minuke.Chromatograph i ka ʻōnaehana kūpono, a e hoʻopaʻa i nā pane kiʻekiʻe e like me ke kuhikuhi ʻana no ke Kaʻina: ʻo ka hoʻonā, R, ma waena o nā xylose a me nā piko fructose ʻaʻole i emi iho ma mua o 2.0.ʻAʻole ʻoi aku ka nui o ka ʻokoʻa maʻamau no ka hoʻopiʻi hou ʻana ma mua o 2.0%.
Kaʻina hana-Hoʻokaʻawale i nā puke like (ma kahi o 25 µL) o ka hoʻomākaukau Assay a me ka hoʻomākaukau maʻamau i loko o ka chromatograph, e hoʻopaʻa i nā chromatograms, a ana i nā pane no nā piko nui.E helu i ka nui, ma mg, o C5H10O6, ma ka hapa o Xylose i laweia e ke kumu:
10C(rU / rS)
i loko o ka C ka manaʻo, i ka mg no mL, o USP Xylose RS i ka hoʻomākaukau maʻamau;a ʻo rU a me rS nā pane kiʻekiʻe i loaʻa mai ka hoʻomākaukau Assay a me ka hoʻomākaukau maʻamau.