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一水乳糖是一种天然二糖化合物,是从牛奶中提取的,由右旋糖和半乳糖组成的,味微甜,本品水中易溶,微溶于醇, 氯仿或乙醚中不溶。在GLC分离硝 乳糖特性: 由哺乳动物的乳中分出的一种双糖。牛乳中约含4%-5%,人乳中约含6.7%。经酸性水解得等分子的D-葡萄糖和D-半乳糖。是还原糖,能还原费林溶液。在常温水溶液中结晶得α-乳糖,在93℃以上结晶得β-乳糖。 α-乳糖即普通的乳糖。有微弱的甜味,通常带一分子结晶水。呈单斜晶体。120℃时失去结晶水,快速加热,其水溶液有变旋现象,[a]20D-92.6°→+83.5°(10分钟)→+69°(50分钟)→+52.3°(22小时)。 β-乳糖比α-乳糖稍甜。白色晶体。熔点252℃。其水溶液也有变旋现象。[α]25D+34°(3分钟)→+39°(6分钟)→+46°(1小时)→52.3°(22小时)。β-乳糖在常温吸水后能转变成α-乳糖,后者加热至93℃以上又变成β-乳糖。基二甲苯和二甲苯异构体中是液固相的组分。
Chinese name
α-乳糖一水合物
English name
α-Lactose monohydrate
Chinese alias
β-D-Gal-(1→4)-α-D-Glc 4-O-β-D-Galactopyranosyl-α-D-glucose
English alias
alpha-Lactose monohydrate | Respitose | Fenyramidol (VAN) (*hydrochloride*) | Lactose monohydrate | .alpha.-D-Glucopyranose, 4-O-.beta.-D-galactopyranosyl-, monohydrate | Lactose (JP17) | Spherolac 100 | LACTOSE MONOHYDRATE [EP MONOGRAPH] | (2R,3R,4S,5R,6
CAS number
5989-81-1
molecular formula
C12H22O11 · H2O
molecular weight
360.31 g/mol
Exact mass
超纯级
PSA
191.000 Ų
Logp
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Research chemical CAS 5989-81-1 98%; 500g

Research chemical CAS 5989-81-1 98%; 500g; supplied for laboratory research, analysis, inspection, and scientific procurement use; specifications: 98%; 500g.

item number:S35561-500g
Product model:500g
level: 98%; 500g
Lead Time:30days
sold 929 Items
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