CÓMO PROBAR LE POLISACÁRIDO

Bix prueba polisacárido.

1.试剂Reagent

1. 1苯酚 fenol (AR).

1. 2重蒸水RedistilledWater

1. 3浓硫酸 (AR) SulfuricAcid

1.45%苯酚溶液:取苯酚加热蒸馏,收集182度馏分,吸取此馏分10ml加水至200ml即可。

5 ti chúumuk PhenolSolution: Takeheatphenoldistillationanddistillatecollect182degree, absorbdistillation10mlandaddwaterto200ml.

2.仪器和用具InstrumentandAppliance

2. 1电子天平 ElectronicBalance (1 leti' 100000)

2. 2玻璃仪器: 容量瓶GlassApparatus:VolumetricFlask

2. 3超声波清洗器UltrasonicCleaner

2. 4紫外分光光度计UltravioletSpectrophotometer

2. 5玻璃比色皿 GlassCell (25px).

3、步骤Process

3.1标准曲线的建立

EstablishedStandardCurves

3.1. 1精密称取恒重后的葡萄糖对照品10mg置于100ml容量瓶中, 加入重蒸水溶解并定容。

AccuratelymeasureconstantweightGlucosereferencesubstance10mgandadd into100mlvolumetricflaskwithheavysteamwaterdissolvedandconstantvolume.

3.1. 2用吸管精密吸取上述标准液0, 0.1, 0.2, 0.4, 0.6, 0. 8ml。 分别置于具塞刻度试管中,并用蒸馏水补充至2ml,加入5%的苯酚溶液1.0ml,浓硫酸5.0ml,振摇5分钟,同时作一个空白对照。

Accuratelyabsorbabovestandardliquid0, 0.1, 0.2, 0.4, 0.6, 0.8 ml ti', respectivelyin Graduatedtesttubewithstopper,adddistilledwaterto2ml,andadd1.0ml5% PhenolSolution, SulfuricAcid5.0ml, Vibrationwave5minutes, makeablank controlatthesametime.

3.1. 3在沸水浴中加热15分钟, 取出, 冷水冷却30分钟。

Heatingfor15minutesinaboilingwater, takeoutandcoolingincoldwaterfor30 minutos.

3.1. 4紫外可见分光光度计在波长490nm处测定吸光度。

UV-visspectrophotometerabsorbanceat490nmwavelength.

3.1. 5以吸光度为纵坐标, 葡萄糖浓度为横坐标绘制标准曲线。

Absorbanceasordinate, glucoseconcentrationasabscissa, drawingstandardcurve.

3. 2样品的测定SampleTest

3.2.1 精密称取样品0.20g,置索氏提取器中,用80%乙醇10ml回流2h,残渣用

80 ti chúumuk 乙醇洗至无色, 继续用水100ml回流2h, 反复洗至250ml容量瓶中, 定容, 摇匀成为样品液。

Accuratelymeasuresample0.2gintosoxhletextractor,with10ml80%ethanol reflux2h, andResiduewith80 ti chúumuk ethanoltowashtocolorless, thenwith100ml waterreflux2h,

repeatedwashinginto250mlvolumetricflask, constantvolume ti', Shakewelltothesampleliquid.

3.2.2 精密吸取上述溶液2.0ml置具塞试管中,照标准曲线项下"加入5%的苯酚溶液~"起,依法操作

Accuratelyabsorbabovestandardliquid 2,0 ml, addintoGraduatedtesttubewith tapón ti', Accordingtothestandardcurveandquot, añadir 5 ti chúumuk PhenolSolutionandquot;

3.2.3 在标准曲线上查出样品吸光度值对应的毫克数。

Findoutthesamplenumberofmgabsorbancevalues

4、计算Calculate

M ti'-SampleVolume (g);

V Dilutionratio;

U Sampleabsorbancecorrespondingmg