Method for preparing D-mannitol from konjak refined powder
A technology of konjac powder and mannitol, which is applied in the direction of fermentation, etc., can solve the problems of troublesome operation, large environmental pollution, repeated operations, etc., and achieve the effects of short production cycle, less environmental pollution and simplified process
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Embodiment 1
[0033] Take by weighing the konjac fine powder 100.0g that contains glucomannan 75%, slowly add the beta-mannanase aqueous solution of 240ml concentration 0.002% (W / W) under stirring at 170 rev / mins, temperature is 45 ℃, The pH was 6.0 and the hydrolysis was 6 hours. After adding, increase the rotation speed to 285 rpm, adjust the pH to 2.1 with 0.5% sulfuric acid, then increase the pressure to 0.15Mpa, keep the temperature at 126°C for 35 minutes, release the pressure, and cool down to 65°C Use 120 mesh filter nets to filter and remove residue, obtain reddish-brown sugar mixture filtrate 300ml, adjust the pH value of the sugar mixture to 6.0 with 5% (V / V) sodium hydroxide solution, decolorize until the solution is light yellow with activated carbon, and then Perform ion exchange and concentrate in vacuo to 45%. High performance liquid chromatography detected that the mannose content in the concentrated mixed sugar solution was 61.83%. Use 1% sodium hydroxide solution to adj...
Embodiment 2
[0035] Take by weighing the konjac powder 120.0g that contains glucomannan 70%, slowly add to the beta-mannanase aqueous solution of 250ml concentration 0.003% (W / W) under stirring at 180 rev / mins, temperature is 50 ℃, The pH is 5.5 and the hydrolysis takes 5 hours. After adding, increase the rotation speed to 270 rpm, adjust the pH to 2.3 with 2.5% (V / V) hydrochloric acid, then increase the pressure to 0.12Mpa, and keep the temperature at 124°C for 45 minutes before releasing the pressure and cooling down Remove the slag by filtering with a 120-mesh filter at 60°C to obtain 350ml of reddish-brown sugar mixture filtrate, adjust the pH value of the sugar mixture to 6.5 with 2.5% (V / V) sodium hydroxide solution, and decolorize it with activated carbon until the solution is light Yellow, then ion exchanged, concentrated in vacuo to 50%. The mannose content in the concentrated sugar mixture liquid was detected to be 64.5% by high performance liquid chromatography. Use 3% sodium ...
Embodiment 3
[0037] Take by weighing the konjac powder 150.0g that contains glucomannan 78%, slowly add to the beta-mannanase aqueous solution of 320ml concentration 0.004% (W / W) under stirring at 150 rev / mins, temperature is 50 ℃, The pH was 5.0 and the hydrolysis took 4 hours. After adding, increase the rotation speed to 260r / min, adjust the pH to 2.5 with 1.0% (V / V) hydrochloric acid, then increase the pressure to 0.1Mpa, and the high temperature to 121°C, keep this state for 50 minutes, release the pressure, and cool down to 50 ℃ with a 120-mesh filter screen to filter and remove the residue to obtain 370ml of reddish-brown sugar mixture filtrate, adjust the pH value of the sugar mixture to 6.8 with 1.0% (V / V) sodium hydroxide solution, and decolorize until the solution is pale yellow with activated carbon. It was then ion-exchanged and concentrated to 50% in vacuo. High performance liquid chromatography detected that the mannose content in the concentrated sugar mixture was 65.1%. U...
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Abstract
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Application Information
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