Method for preparing sulfated water-soluble dietary fiber employing extrusion
A technology of dietary fiber and sulfation, which is applied in the field of food processing, can solve the problem of no sulfation of dietary fiber, and achieve the effect of reducing the possibility and increasing the content
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Embodiment 1
[0021] Weigh 100g of crushed apple pomace that has passed through a 20-mesh sieve, add distilled water according to a solid-liquid ratio (g / mL) of 1:8, adjust the pH to 13.0 with 2mol / L sodium hydroxide aqueous solution, add 2% hydrogen peroxide by distilled water volume, 70 Insulate at ℃ for 2 hours, then pass through a 100-mesh sieve, wash with water on the sieve until neutral, dry in an oven at 60°C, crush and pass through a 40-mesh sieve to obtain apple dietary fiber;
[0022] Extrusion esterification reaction: take 30g of apple dietary fiber, add 9mL of saturated aqueous solution of sulfamic acid (containing 1.31g of sulfamic acid), stir well, then add 6mL of concentrated sulfuric acid (11.04g 98% concentrated sulfuric acid), stir well and then static Place the sample for 1 hour; adjust the screw speed at 750r / min, put the sample into the extruder and extrude it. After the extrusion is completed, dry the extrudate at 50°C and cool it at room temperature to obtain the modif...
Embodiment 2
[0025] Weigh 100g of crushed apple pomace that has passed through a 40-mesh sieve, add distilled water according to a solid-liquid ratio (g / mL) of 1:8, adjust the pH to 13.0 with 3mol / L aqueous sodium hydroxide solution, add 2% hydrogen peroxide by volume of distilled water, 70 Insulate at ℃ for 2 hours, then pass through a 100-mesh sieve, wash with water on the sieve until neutral, dry in an oven at 50°C, crush and pass through a 60-mesh sieve to obtain apple dietary fiber;
[0026] Extrusion esterification reaction: take 30g of apple dietary fiber, add 12mL of saturated aqueous solution of sulfamic acid (containing 1.75g of sulfamic acid), stir well, then add 15mL of concentrated sulfuric acid (27.6g 98% concentrated sulfuric acid), stir well and then static Place the sample for 1 hour; adjust the screw speed at 650r / min, put the sample into the extruder and extrude it. After the extrusion is completed, dry the extrudate at 50°C and cool it at room temperature to obtain the...
Embodiment 3
[0029] Weigh 200g of crushed apple pomace through a 40-mesh sieve, add distilled water according to a solid-liquid ratio (g / mL) of 1:8, adjust the pH to 13.0 with 4mol / L sodium hydroxide aqueous solution, add 2% hydrogen peroxide by distilled water volume, 70 Insulate at ℃ for 2 hours, then pass through a 100-mesh sieve, wash with water on the sieve until neutral, dry in an oven at 50°C, crush and pass through a 40-mesh sieve to obtain apple dietary fiber;
[0030] Extrusion esterification reaction: take 50g of apple dietary fiber, add 15mL of saturated aqueous solution of sulfamic acid (containing 2.19g of sulfamic acid), stir well, then add 15mL of concentrated sulfuric acid (27.6g of 98% concentrated sulfuric acid), stir well Stand still for 1 hour to obtain the sample; adjust the screw speed at 450r / min, put the sample into the extruder for extrusion, after the extrusion is completed, dry the extrudate at 50°C, and cool it at room temperature to obtain the modified apple me...
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