CN101319060B - Method for preparing dry heat denatured rice starch - Google Patents

Abstract

The invention relates to a method for preparing dry-heating modified rice starch, belonging to the modified starch preparation technical field. The method takes rice starch as a raw material, adds different types of ionic glue, uniformly mixes the raw material and the ionic glue, performs dry-heating treatment for 4 hours at a temperature of 130 DEG C under the condition that the moisture content is less than 10 percent, and prepares the dry-heating ionic glue modified rice starch. The method is a safe and environment-friendly physical modification method, does not use any toxic chemical agent, and does not generate any by-product. The modified rice starch prepared has functional characters similar to those of crosslinked starch prepared by the chemical modification method. Moreover, the modified rice starch with different pasting characteristics can be prepared according to the difference of the amount and the variety of the ionic glue, and meets different application requirements.

Description

A kind of preparation method of dry heat denatured rice starch

Technical field

The xeothermic technology of a kind of usefulness prepares the method for the sex change Starch rice of different gelatinization characteristics, the present invention relates to use the preparation that xeothermic technology is carried out the sex change Starch rice, belongs to the modified starch preparing technical field.

Background technology

Starch and derivative thereof are widely used in every field such as food, weaving, papermaking, makeup, medicine, the energy because of its excellent functional property.For some performance of improving starch or enlarge its range of application people and utilize physics, chemistry or enzyme process that starch is carried out modification usually.The method of modifying of widespread use at present is a chemical method, in general, in the chemical modification process, only introduces the chemical group of minute quantity in starch molecule, just can improve its performance widely.Wherein, utilizing the cross-linking starch of chemical method preparation is a big kind of modified starch.

The alcoholic extract hydroxyl group of starch forms two ehter bonds or diester linkage with the chemical reagent with binary or polynary functional group, makes that " bridge formation " is the cancellated reaction of hyperspace together between two or more starch molecules, is called crosslinking reaction.The cross-linking of starch product is called cross-linking starch.Different with the general starch derivative, cross-linking starch is along with the increase of degree of crosslinking, and gelatinization temperature rises, until dissolving in boiling water.Some special nature of this of cross-linking starch just make it industrial many special purposes be arranged, simultaneously also thereby obtain the great attention of starch researcher.

Though chemical method can reach the requirement of directed modification, in the chemical modification process, can introduce a lot of chemical reagent, more, the complex disposal process of by product; In addition, add the chemical reagent processing and can cause environmental problem inevitably.The physics method is that a kind of methods such as heat, radiation, gamma-rays of utilizing are handled the method that makes starch denaturalization, and physically modified is simple with respect to chemical process, treating processes is comparatively safe.

The dry heat treatment of starch is a kind of physical method, and dry technology for production is simple, safety, yield height, do not produce toxic products, pollution-free, is a kind of rising production method.Under the condition that ion glue exists, can produce the similar functional property of cross-linking starch for preparing with the chemical modification method through dry heat denatured starch.

Edible film is to be raw material with edible natural material (as polysaccharide, albumen, lipoid etc.), certain intensity is arranged, has the film of porous network structure by what intramolecularly and molecular interaction formed.Starch film is a research type the earliest in the edible package.The starch film that China is used to pack the earliest is commonly called as wafer, generally is used for the packing of candy aborning, and is edible together with candy.But, because starch film is to form by the hydrogen bond action between starch molecule, its mechanical properties such as tensile strength, unit elongation etc. are all more weak, and the starch film that makes is more crisp, and easily breaks.

Carry out the dry heat denatured starch that makes by mixing,, all have greatly improved with the physics and the mechanical characteristics of the edible film of its preparation because certain degree of crosslinking has been arranged with ion glue.With the Starch rice be raw material edible film research seldom, but special functional propertys such as particle is little, color in vain, does not contain flavour substances because Starch rice has, easy digestion, not only resistance oxygen, the water-resisting ability of film are better than other starch as the raw material of edible film with it, can prevent the oxydative spoilage of food, and be easy to digestion, can be used in old and the infant or baby food.In the dry heat treatment process, ion glue can with Starch rice generation crosslinking reaction, the degree of reaction is relevant with the consumption and the kind of ion glue.

Summary of the invention

The xeothermic technology of a kind of usefulness prepares the method for the sex change Starch rice of different gelatinization characteristics, be improvement and development to existing modified starch production technology, under the condition that ion glue exists, can produce the similar functional property of cross-linking starch for preparing with the chemical modification method through dry heat denatured starch.Technology of the present invention is simple, safe, pollution-free, is a kind of physical modification method of safety and environmental protection.

Technical scheme of the present invention: a kind of preparation method of dry heat denatured rice starch is a raw material with the Starch rice, adds ion glue, after mixing, moisture content less than 10% condition under, 130 ℃ of dry heat treatment; Technology is:

(1) mixing of starch and ion glue: ion glue is dissolved in the distilled water, adds Starch rice in the ion sol solution, stirred 30 minutes, make to mix, the consumption of ion glue is 1%～2% of starch and an ion glue gross weight; Described ion glue is selected from xanthan gum, sodium alginate or guar gum;

(2) drying: place 40 ℃ baking oven to dry the mixed solution of Starch rice and ion glue, drop to below 10% to moisture content, grind and sieve;

(3) dry heat treatment: the mixed powder of will sieve later Starch rice and ion glue promptly obtains xeothermic ion glue sex change Starch rice 130 ℃ of xeothermic reactions 4 hours.

The application of described dry heat denatured rice starch, it is characterized in that being used to manufacture edible film, be raw material with the dry heat denatured rice starch, add the glycerine of sex change Starch rice raw material weight 10% as softening agent, the water that adds 20 times of amounts of raw material weight, after stirring, keep heating 10 minutes at 95 ℃, be cooled to 40 ℃, vacuum outgas 1h is applied in the surface of strawberry, cashew nut or almond with it after removing bubble in the solution, drying is 12 hours under the room temperature, form edible film, prevent the putrid and deteriorated of strawberry, cashew nut or almond food.

After having used different types of ion glue and Starch rice mixes, the present invention carries out dry heat denatured processing.The contriver finds that the gelatinization characteristic of the starch after sex change is relevant with the kind and the consumption of ion glue.When selecting for use sodium alginate that Starch rice is done dry heat treatment, consumption is 1% o'clock, can improve the gelatinization viscosity of Starch rice, and when the consumption of sodium alginate increased to 2%, then the gelatinization viscosity of starch reduces on the contrary; When selecting for use xanthan gum that Starch rice is done dry heat treatment, consumption is 1% o'clock, and the gelatinization viscosity of starch has all reduced, and when the consumption of xanthan gum increased to 2%, then starch pasting was suppressed fully.

Beneficial effect of the present invention: the preparation technology of modified starch adopts safety, simple physics method of modifying, and is pollution-free, do not produce any byproduct; Can have the modified starch of different qualities according to the different preparations of ion glue consumption and kind, satisfy different application requiring.

Description of drawings

Fig. 1 natural rice starch and add 1% xanthan gum dry heat treatment after the gelatinization characteristic of rice modified starch.

Embodiment

Embodiment 1

The 0.1g sodium alginate is dissolved in the 20mL distilled water, adds 9.9g starch, stirring 30min makes and mixes, place 40 ℃ of oven drying to moisture contents to drop to below 10%, grind and sieve, 130 ℃ are descended xeothermic reaction 4 hours, make dry heat denatured rice starch.

Embodiment 2

The 0.2g sodium alginate is dissolved in the 20mL distilled water, and all the other steps make dry heat denatured rice starch with embodiment 1.

Embodiment 3

The 0.1g xanthan gum is dissolved in the 20mL distilled water, and all the other steps make dry heat denatured rice starch with embodiment 1.

Embodiment 4

The 0.2g xanthan gum is dissolved in the 20mL distilled water, and all the other steps make dry heat denatured rice starch with embodiment 1.

Embodiment 5

Get the dry heat denatured rice starch 5g that embodiment 3 makes, add 0.5g glycerine, 100mL water, 95 ℃ were heated 10 minutes while stirring, solution is cooled to 40 ℃ again, vacuum outgas 1h is applied in the surface of strawberry, cashew nut, almond with it after removing bubble in the solution, drying is 12 hours under the room temperature, forms edible film.

Fig. 1 shows is the rice modified starch of embodiment 3 preparations and without the gelatinization characteristic of the natural rice starch of denaturing treatment.As seen from Figure 1, after the xanthan gum dry heat treatment of interpolation 1% in the Starch rice, the gelatinization viscosity of sex change Starch rice obviously reduces, and in gelatinization process, there is not tangible gelatinization peak viscosity, but a platform area appears, expansion and disintegration that starch granules is described are delayed, and demonstrate shear stability in gelatinization process, and this characteristic is closely similar with the cross-linking starch that uses the preparation of chemical modification method.Explanation has had certain degree of crosslinking by mixing with ion glue and carrying out the dry heat denatured starch that makes.Use this character, will prepare the edible film coating, can form fine and close edible film, in order to prevent the putrid and deteriorated of food such as strawberry, cashew nut, almond with the Starch rice after the ion glue dry heat treatment.

Claims (1)

1. the application of a dry heat denatured rice starch is characterized in that being used to make edible film prevents the putrid and deteriorated of strawberry, cashew nut or almond food; Be raw material with the dry heat denatured rice starch, add the glycerine of sex change Starch rice raw material weight 10% as softening agent, the water that adds 20 times of amounts of raw material weight, after stirring, keep heating 10 minutes at 95 ℃, be cooled to 40 ℃, vacuum outgas 1h is applied in the surface of strawberry, cashew nut or almond with it after removing bubble in the solution, under the room temperature dry 12 hours, form edible film, prevent the putrid and deteriorated of strawberry, cashew nut or almond food;

The preparation of described dry heat denatured rice starch is to be raw material with the Starch rice, adds ion glue, after mixing, moisture content less than 10% condition under, 130 ℃ of dry heat treatment; Technology is:

(1) mixing of starch and ion glue: ion glue is dissolved in the distilled water, adds Starch rice in the ion sol solution, stirred 30 minutes, make to mix, the consumption of ion glue is 1%～2% of starch and an ion glue gross weight; Described ion glue is selected from xanthan gum, sodium alginate or guar gum;

(2) drying: place 40 ℃ baking oven to dry the mixed solution of Starch rice and ion glue, drop to below 10% to moisture content, grind and sieve;

(3) dry heat treatment: the mixed powder of will sieve later Starch rice and ion glue promptly obtains xeothermic ion glue sex change Starch rice 130 ℃ of xeothermic reactions 4 hours.

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