Pretreatment method of starchy material

Abstract

The invention discloses a pretreatment method of a starchy material. The pretreatment method comprises the following steps of: (1) preparing a water solution containing high-temperature resistant amylase, mixing the water solution containing the high-temperature resistant amylase with starchy material powder to obtain a mixture, wherein the mixing condition comprises a temperature ranging from 65-90 DEG C; (2) firstly spraying the mixture obtained from the step (1) to the temperature of 90-100 DEG C and keeping the temperature, then secondly spraying the product obtained by the first spraying to the temperature of 120-140 DEG C and keeping the temperature; and (3) under the condition of enzymolysis, mixing the product obtained from the step (2) with the amylase for enzymolysis, thus obtaining liquefied emulsion. According to the pretreatment method, the growth of microorganism can be effectively restrained during the process of size mixing, the liquefying effect is stable and complete, the utilization rate of starch is high, and the grain consumption of sugar preparation is low; and besides, calcium hydroxide is not added for adjusting the pH value before spraying and liquefaction, so that the possibility of generation of unfermentable residual sugar is reduced.

Description

technical field

[0001] The invention relates to a pretreatment method for starchy raw materials. Background technique

[0002] At present, domestic enterprises pretreat starchy raw materials (taking corn as an example) as follows: add corn flour to water at a temperature of 50-60°C for slurry preparation, and then add calcium hydroxide to adjust the pH value of the slurry 6.0-6.5, add amylase, spray once to 80-95°C, keep the iodine test qualified, and press filter to obtain liquefied supernatant.

[0003] The above method has the following defects: (1) It is difficult for the amylase to mix evenly with the corn flour, and the liquefaction effect is unstable. (2) The utilization rate of starch is low. (3) The liquefaction is not complete, and the consumption of sugar grain is high. As we all know, it is difficult for amylase to interact with starch crystals without swelling. The iodine test of the liquefied liquid is barely qualified, but the hydraulic filtration of the li...

Examples

Embodiment 1

[0038] (1) Dissolve the high-temperature-resistant amylase with an amount of 25 enzyme activity units / g corn flour in water, and mix the obtained high-temperature-resistant amylase aqueous solution with 100 parts by weight of corn flour (with an average particle size of 400 μm) at 70°C ) are mixed to obtain a mixture;

[0039] (2) Inject the mixture and saturated steam at 150°C once in the Megalight injector (the weight ratio of steam to mixture is 0.05:1), and the time of one injection is 5s, so that the temperature of the product after contacting with steam is 90°C, and the laminar flow was maintained for 120 minutes; the product obtained from the first injection and the supersaturated steam at 220°C were injected twice in the Zhaoguang injector (the weight ratio of steam to the product obtained from the first injection was 0.05:1), The time of the secondary injection is 5s, so that the temperature of the product after contacting with steam is 120°C, and it is kept at this t...

Embodiment 2

[0042] (1) Dissolve the high-temperature-resistant amylase with an amount of 35 enzyme activity units / g corn flour in water, and mix the obtained high-temperature-resistant amylase aqueous solution with 100 parts by weight of corn flour (with an average particle size of 400 μm) at 85°C ) are mixed to obtain a mixture;

[0043] (2) The mixture and saturated steam at 160°C are sprayed once in the Megalight injector (the weight ratio of steam to mixture is 0.05:1), and the time of one injection is 5s, so that the temperature of the product after contacting with steam is 100°C, and maintain the laminar flow for 60 minutes; then inject the product obtained from the first injection and the supersaturated steam at 220°C in the Megalight injector for a second injection (the weight ratio of steam to the product obtained from the first injection is 0.06:1), The time of the secondary injection is 5s, so that the temperature of the product after contacting with steam is 140°C, and keep at...

Embodiment 3

[0046] (1) Dissolve the high-temperature-resistant amylase with an amount of 30 enzyme activity units / g corn flour in water, and mix the obtained high-temperature-resistant amylase aqueous solution with 100 parts by weight of corn flour (with an average particle size of 400 μm) at 80°C ) are mixed to obtain a mixture;

[0047] (2) Inject the mixture and saturated steam at 158°C once in the Megalight injector (the weight ratio of steam to mixture is 0.05:1), and the time of one injection is 5s, so that the temperature of the product after contacting with steam is 98°C, and maintain laminar flow for 100 minutes; then, the product obtained from the first injection and the steam at 220°C are injected twice in the Zhaoguang injector (the weight ratio of steam to the product obtained from the first injection is 0.05:1), the second time The injection time is 5s, so that the temperature of the product after contacting with steam is 130°C, and it is kept at this temperature for 6min; ...

technical field

[0001] The invention relates to a pretreatment method for starchy raw materials. Background technique

[0002] At present, domestic enterprises pretreat starchy raw materials (taking corn as an example) as follows: add corn flour to water at a temperature of 50-60°C for slurry preparation, and then add calcium hydroxide to adjust the pH value of the slurry 6.0-6.5, add amylase, spray once to 80-95°C, keep the iodine test qualified, and press filter to obtain liquefied supernatant.

[0003] The above method has the following defects: (1) It is difficult for the amylase to mix evenly with the corn flour, and the liquefaction effect is unstable. (2) The utilization rate of starch is low. (3) The liquefaction is not complete, and the consumption of sugar grain is high. As we all know, it is difficult for amylase to interact with starch crystals without swelling. The iodine test of the liquefied liquid is barely qualified, but the hydraulic filtration of the li...

Examples

Embodiment 1

[0038] (1) Dissolve the high-temperature-resistant amylase with an amount of 25 enzyme activity units / g corn flour in water, and mix the obtained high-temperature-resistant amylase aqueous solution with 100 parts by weight of corn flour (with an average particle size of 400 μm) at 70°C ) are mixed to obtain a mixture;

[0039] (2) Inject the mixture and saturated steam at 150°C once in the Megalight injector (the weight ratio of steam to mixture is 0.05:1), and the time of one injection is 5s, so that the temperature of the product after contacting with steam is 90°C, and the laminar flow was maintained for 120 minutes; the product obtained from the first injection and the supersaturated steam at 220°C were injected twice in the Zhaoguang injector (the weight ratio of steam to the product obtained from the first injection was 0.05:1), The time of the secondary injection is 5s, so that the temperature of the product after contacting with steam is 120°C, and it is kept at this t...

Embodiment 2

[0042] (1) Dissolve the high-temperature-resistant amylase with an amount of 35 enzyme activity units / g corn flour in water, and mix the obtained high-temperature-resistant amylase aqueous solution with 100 parts by weight of corn flour (with an average particle size of 400 μm) at 85°C ) are mixed to obtain a mixture;

[0043] (2) The mixture and saturated steam at 160°C are sprayed once in the Megalight injector (the weight ratio of steam to mixture is 0.05:1), and the time of one injection is 5s, so that the temperature of the product after contacting with steam is 100°C, and maintain the laminar flow for 60 minutes; then inject the product obtained from the first injection and the supersaturated steam at 220°C in the Megalight injector for a second injection (the weight ratio of steam to the product obtained from the first injection is 0.06:1), The time of the secondary injection is 5s, so that the temperature of the product after contacting with steam is 140°C, and keep at...

Embodiment 3

[0046] (1) Dissolve the high-temperature-resistant amylase with an amount of 30 enzyme activity units / g corn flour in water, and mix the obtained high-temperature-resistant amylase aqueous solution with 100 parts by weight of corn flour (with an average particle size of 400 μm) at 80°C ) are mixed to obtain a mixture;

[0047] (2) Inject the mixture and saturated steam at 158°C once in the Megalight injector (the weight ratio of steam to mixture is 0.05:1), and the time of one injection is 5s, so that the temperature of the product after contacting with steam is 98°C, and maintain laminar flow for 100 minutes; then, the product obtained from the first injection and the steam at 220°C are injected twice in the Zhaoguang injector (the weight ratio of steam to the product obtained from the first injection is 0.05:1), the second time The injection time is 5s, so that the temperature of the product after contacting with steam is 130°C, and it is kept at this temperature for 6min; ...

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