CN105037750A - Method for preparing hydrosol by using modified starch - Google Patents

Abstract

The invention discloses a method for preparing hydrosol by using modified starch, which comprises the following steps: 1) dissolving or dispersing starch in deionized water; 2) adding cellulase and alkaline proteinase into the starch solution obtained in the step 1); 3) adding an NaOH water solution into the modified starch solution in the step 2), standing for 8-10 hours, and pulverizing the mixed solution under ultrasonic actions to the suspended dispersed state; 4) cleaning Portulaca molokiniensis leaf with deionized water, pulverizing, filtering, separating and purifying to obtain a Portulaca molokiniensis leaf extracting solution, and regulating the pH value to 8.5-9 with a silicic acid solution to obtain an acidic Portulaca molokiniensis leaf extracting solution; and 5) mixing the raw material in the step 3) and the raw material in the step 4) in a weight ratio of 1:8, and stirring at 28 DEG C for 4-6 hours to obtain the modified starch hydrosol. The obtained modified starch hydrosol has the advantages of favorable stability and uniform distribution.

Description

A kind of method utilizing modified starch to prepare the water-sol

Technical field

The present invention relates to water-sol preparation field, particularly relate to a kind of method utilizing modified starch to prepare the water-sol.

Background technology

The water-sol is the colloidal sol using water as dispersion medium.Wherein divided particles can be single macromole, also can be to be permitted polymolecular aggregate.Starch as a kind of polyose reproducibility natural polymer, wide material sources, cheap.Starch, be by multiple glucose unit form containing the polymer enriching hydroxyl, by molecule and intermolecular hydrogen bond action form " capsule " of molecular level, for the growth of nano particle provides template.Modified starch; improve the performance of starch, expand its range of application; utilize physics, chemistry or enzymatic treatment; starch molecule is introduced new functional group or changes starch molecule size and starch granular property; thus change the natural characteristic (as: gelatinization point, thermoviscosity and stability thereof, freeze-thaw stability, gel force, film-forming properties, the transparency etc.) of starch; it is made to be more suitable for the requirement of certain application; usually can adopt common starch in the preparation of the water-sol on market but there will be a lot of problem, having many weak points.

Summary of the invention

The object of this invention is to provide a kind of method utilizing modified starch to prepare the water-sol.

The present invention is achieved through the following technical solutions:

Utilize modified starch to prepare a method for the water-sol, the concrete steps of the method are:

1) by starch dissolution or be scattered in deionized water, at 50-70 DEG C, be stirred to it stick with paste completely

Change, obtain the starch solution that concentration is 4 ~ 8wt%;

2) in step 1) gained starch solution, 80U/mL cellulase is added, solution pH value is adjusted to 5.0, temperature controls to 55 DEG C, react after 1.5 hours, starch solution pH value is adjusted to 9.5, keeps temperature-resistant, add 120U/mL Sumizyme MP, react 3.5 hours, obtain modified starch solution;

3) by step 2) in add the NaOH aqueous solution that mass percent concentration is 0.5-1wt% in modified starch solution, after temperature is react 20-30min in 80-100 DEG C, leave standstill 8-10h, by the mixed solution after leaving standstill through ultrasonication in suspended dispersed state;

4), after money wood vanes deionized water being cleaned, adopt and pulverize, filter, be separated, purify, obtain money wood leaf extract, regulate pH to 8.5-9 with silicate solution, obtain acid money wood leaf extract;

5) by weight 1:8 by 3) Raw and 4) Raw mixes, and after stirring 4-6h, obtains the modified starch water-sol under being placed in 28 DEG C of conditions.

The invention has the beneficial effects as follows: compared with prior art, the invention has the beneficial effects as follows:

1, Zulkovsky starch and money wood leaf extract is selected, not only improve the water-sol greatly, greatly improve film forming properties, avoid the introducing of toxic reagent, possess raw material extensively, reaction temperature and, the advantage such as asepsis environment-protecting, meet the theory of " Green Chemistry " of modern requirements.

2, the particle diameter of the water-sol by adopting modified starch to prepare is evenly distributed, good stability, and due to water-sol particle diameter little, the water-sol at 900nm place, visible region transmittance at 55%-70%, the water-sol in clarifying, transparence, foreign matter content is low.

3, the modified starch water-sol prepared possesses good stability, is evenly distributed.

Embodiment

Utilize modified starch to prepare a method for the water-sol, the concrete steps of the method are:

1) by starch dissolution or be scattered in deionized water, at 50-70 DEG C, be stirred to it stick with paste completely

Change, obtain the starch solution that concentration is 4 ~ 8wt%;

2) in step 1) gained starch solution, 80U/mL cellulase is added, solution pH value is adjusted to 5.0, temperature controls to 55 DEG C, react after 1.5 hours, starch solution pH value is adjusted to 9.5, keeps temperature-resistant, add 120U/mL Sumizyme MP, react 3.5 hours, obtain modified starch solution;

3) by step 2) in add the NaOH aqueous solution that mass percent concentration is 0.5-1wt% in modified starch solution, after temperature is react 20-30min in 80-100 DEG C, leave standstill 8-10h, by the mixed solution after leaving standstill through ultrasonication in suspended dispersed state;

4), after money wood vanes deionized water being cleaned, adopt and pulverize, filter, be separated, purify, obtain money wood leaf extract, regulate pH to 8.5-9 with silicate solution, obtain acid money wood leaf extract;

5) by weight 1:8 by 3) Raw and 4) Raw mixes, and after stirring 4-6h, obtains the modified starch water-sol under being placed in 28 DEG C of conditions.

By the test comparison water-sol of the present invention and the existing water-sol:

	Zeta potential (mV)	Median size (nm)	Stability	Transmittance (%)
					The water-sol of the present invention	-32.5	132	Excellent homogeneity	76
The existing water-sol	-20.1	168	Preliminary visible denseness is irregular	58

Table 1

Can find out that the water-sol of the present invention all has good advantage than the existing water-sol in each performance by table 1.

Claims (1)

1. utilize modified starch to prepare a method for the water-sol, it is characterized in that, concrete steps are:

1) by starch dissolution or be scattered in deionized water, at 50-70 DEG C, be stirred to it stick with paste completely

Change, obtain the starch solution that concentration is 4 ~ 8wt%;

2) in step 1) gained starch solution, 80U/mL cellulase is added, solution pH value is adjusted to 5.0, temperature controls to 55 DEG C, react after 1.5 hours, starch solution pH value is adjusted to 9.5, keeps temperature-resistant, add 120U/mL Sumizyme MP, react 3.5 hours, obtain modified starch solution;

3) by step 2) in add the NaOH aqueous solution that mass percent concentration is 0.5-1wt% in modified starch solution, after temperature is react 20-30min in 80-100 DEG C, leave standstill 8-10h, by the mixed solution after leaving standstill through ultrasonication in suspended dispersed state;

4), after money wood vanes deionized water being cleaned, adopt and pulverize, filter, be separated, purify, obtain money wood leaf extract, regulate pH to 8.5-9 with silicate solution, obtain acid money wood leaf extract;

5) by weight 1:8 by 3) Raw and 4) Raw mixes, and after stirring 4-6h, obtains the modified starch water-sol under being placed in 28 DEG C of conditions.