Method for producing high-viscosity and high-degree-of-substitution carboxymethyl cassava starch by utilizing ultrahigh-pressure blasting technique

Abstract

The invention discloses a method for producing high-viscosity and high-degree-of-substitution carboxymethyl cassava starch by utilizing an ultrahigh-pressure blasting technique. The method comprises the steps such as alkaline treatment, etherification reaction and purification. The method is carried out by primarily achieving the purpose of destroying a crystallization region of cassava starch particles by utilizing sodium hydroxide, sufficiently swelling and alkalifying starch molecules and loosening starch particles under the ultrahigh pressure of a high-pressure homogenizer, so that the hydroxyl of the starch becomes negative oxygen ions and the nucleophilic ability is strengthened, and simultaneously generating an St-O-Na<+> active center, then, preparing the high-viscosity and high-degree-of-substitution carboxymethyl cassava starch through the bimolecular nucleophilic substitution between sodium carboxymethyl starch obtained by alkalifying the starch and chloroacetic acid under the alkaline condition of sodium hydroxide. By utilizing the high-degree destructive effect of the ultrahigh-pressure blasting technique on a crystallization structure of the cassava starch, the technical problems such as degradation of the starch particles in a production process of the high-viscosity and high-degree-of-substitution carboxymethyl cassava starch are solved.

Description

technical field

[0001] The invention belongs to the field of biochemical industry and relates to starch modification technology, in particular to a method for producing carboxymethyl cassava starch with high viscosity and high degree of substitution by using ultra-high pressure blasting technology. Background technique

[0002] Carboxymethylstarchsodium (CMS) is a representative product of modified starch. After carboxymethylation of starch, the carboxymethyl starch ether structure is formed on the hydroxyl group of glucose due to the introduction of carboxymethyl groups. It is a water-soluble anionic macromolecular compound, and its physical and chemical properties are similar to those of carboxymethyl cellulose ( CMC) is similar, also known as modified sodium carboxymethyl starch or sodium starch acetate. CMS is generally non-toxic and odorless white or light yellow powder, odorless, tasteless, non-toxic, heat and easy to absorb moisture. Soluble in water to form a collo...

Examples

Embodiment 1

[0038] The method for producing high-viscosity, high-degree-of-substitution carboxymethyl tapioca starch by ultra-high pressure blasting technology comprises the following steps:

[0039] (1) Alkalization treatment: Add 100 parts by weight of tapioca starch, 60 parts by weight of sodium hydroxide and an aqueous ethanol solution with a volume concentration of 90% to the mixer at the same time, stir evenly at a speed of 600r / min, and heat to 25 ℃, after keeping for 40min, cool down to room temperature naturally, add the high-pressure homogenizer into the hopper, stir at 60rpm to keep the material in suspension, then pass through the high-pressure homogenizer, circulate the material and gradually increase the pressure, stop pressurization when the pressure reaches 100MPa; The ethanol aqueous solution add-on is 10 times of tapioca starch and sodium hydroxide gross weight;

[0040] (2) Etherification reaction: add 40 parts by weight of chloroacetic acid to the high-pressure homogen...

Embodiment 2

[0045] The method for producing high-viscosity, high-degree-of-substitution carboxymethyl tapioca starch by ultra-high pressure blasting technology comprises the following steps:

[0046] (1) Alkalization treatment: Add 120 parts by weight of tapioca starch, 70 parts by weight of sodium hydroxide and an aqueous ethanol solution with a volume concentration of 92% into the mixer at the same time, stir evenly at a speed of 650r / min, and heat to 26 ℃, after keeping for 45min, cool down to room temperature naturally, add the high-pressure homogenizer into the hopper, stir at 60rpm to keep the material in suspension, then pass through the high-pressure homogenizer, circulate the material and gradually increase the pressure, stop pressurization when the pressure reaches 100MPa; The ethanol aqueous solution add-on is 10 times of tapioca starch and sodium hydroxide gross weight;

[0047] (2) Etherification reaction: Add 42 parts by weight of chloroacetic acid to the high-pressure homog...

Embodiment 3

[0052] The method for producing high-viscosity, high-degree-of-substitution carboxymethyl tapioca starch by ultra-high pressure blasting technology comprises the following steps:

[0053] (1) Alkalization treatment: Add 140 parts by weight of tapioca starch, 80 parts by weight of sodium hydroxide and an aqueous ethanol solution with a volume concentration of 93% into the mixer at the same time, stir evenly at a speed of 700r / min, and heat to 27 ℃, keep it for 50 minutes, cool it down to room temperature naturally, add it into the hopper of a high-pressure homogenizer, stir at 60rpm to keep the material in a suspended state, then pass through the high-pressure homogenizer, circulate the material and gradually increase the pressure, and stop pressurization when the pressure reaches 100MPa; The ethanol aqueous solution add-on is 10 times of tapioca starch and sodium hydroxide gross weight;

[0054] (2) Etherification reaction: Add 45 parts by weight of chloroacetic acid to the hi...

technical field

[0001] The invention belongs to the field of biochemical industry and relates to starch modification technology, in particular to a method for producing carboxymethyl cassava starch with high viscosity and high degree of substitution by using ultra-high pressure blasting technology. Background technique

[0002] Carboxymethylstarchsodium (CMS) is a representative product of modified starch. After carboxymethylation of starch, the carboxymethyl starch ether structure is formed on the hydroxyl group of glucose due to the introduction of carboxymethyl groups. It is a water-soluble anionic macromolecular compound, and its physical and chemical properties are similar to those of carboxymethyl cellulose ( CMC) is similar, also known as modified sodium carboxymethyl starch or sodium starch acetate. CMS is generally non-toxic and odorless white or light yellow powder, odorless, tasteless, non-toxic, heat and easy to absorb moisture. Soluble in water to form a collo...

Examples

Embodiment 1

[0038] The method for producing high-viscosity, high-degree-of-substitution carboxymethyl tapioca starch by ultra-high pressure blasting technology comprises the following steps:

[0039] (1) Alkalization treatment: Add 100 parts by weight of tapioca starch, 60 parts by weight of sodium hydroxide and an aqueous ethanol solution with a volume concentration of 90% to the mixer at the same time, stir evenly at a speed of 600r / min, and heat to 25 ℃, after keeping for 40min, cool down to room temperature naturally, add the high-pressure homogenizer into the hopper, stir at 60rpm to keep the material in suspension, then pass through the high-pressure homogenizer, circulate the material and gradually increase the pressure, stop pressurization when the pressure reaches 100MPa; The ethanol aqueous solution add-on is 10 times of tapioca starch and sodium hydroxide gross weight;

[0040] (2) Etherification reaction: add 40 parts by weight of chloroacetic acid to the high-pressure homogen...

Embodiment 2

[0045] The method for producing high-viscosity, high-degree-of-substitution carboxymethyl tapioca starch by ultra-high pressure blasting technology comprises the following steps:

[0046] (1) Alkalization treatment: Add 120 parts by weight of tapioca starch, 70 parts by weight of sodium hydroxide and an aqueous ethanol solution with a volume concentration of 92% into the mixer at the same time, stir evenly at a speed of 650r / min, and heat to 26 ℃, after keeping for 45min, cool down to room temperature naturally, add the high-pressure homogenizer into the hopper, stir at 60rpm to keep the material in suspension, then pass through the high-pressure homogenizer, circulate the material and gradually increase the pressure, stop pressurization when the pressure reaches 100MPa; The ethanol aqueous solution add-on is 10 times of tapioca starch and sodium hydroxide gross weight;

[0047] (2) Etherification reaction: Add 42 parts by weight of chloroacetic acid to the high-pressure homog...

Embodiment 3

[0052] The method for producing high-viscosity, high-degree-of-substitution carboxymethyl tapioca starch by ultra-high pressure blasting technology comprises the following steps:

[0053] (1) Alkalization treatment: Add 140 parts by weight of tapioca starch, 80 parts by weight of sodium hydroxide and an aqueous ethanol solution with a volume concentration of 93% into the mixer at the same time, stir evenly at a speed of 700r / min, and heat to 27 ℃, keep it for 50 minutes, cool it down to room temperature naturally, add it into the hopper of a high-pressure homogenizer, stir at 60rpm to keep the material in a suspended state, then pass through the high-pressure homogenizer, circulate the material and gradually increase the pressure, and stop pressurization when the pressure reaches 100MPa; The ethanol aqueous solution add-on is 10 times of tapioca starch and sodium hydroxide gross weight;

[0054] (2) Etherification reaction: Add 45 parts by weight of chloroacetic acid to the hi...