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Method for preparing purple sweet potato pigment microcapsules

A purple-heart sweet potato and microcapsule technology, which is applied in the field of food additives and natural pigments, can solve the problems of weak dyeing power, easy fading, large usage, etc., achieve good biocompatibility, expand the scope of use, and enhance the coloring effect Effect

Inactive Publication Date: 2012-09-26
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, natural pigments also have the following defects: weak dyeing power, sensitivity to light, heat, oxygen, metal ions and pH value changes, etc., poor stability, easy to fade when added to food; large amount of use; high use cost, Thereby severely limiting the wide application of natural pigments
At present, there are national invention patents for lutein microencapsulation method (patent number CN101219125A) and lycopene microencapsulation method (patent number CN101015342A), but there is no national invention patent for purple heart sweet potato pigment microencapsulation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1 Purple Heart Sweet Potato Pigment Microcapsules

[0039] The preparation of the purple heart sweet potato pigment microcapsules of the present embodiment specifically comprises the following steps:

[0040] 1) Preparation of the core material solution: prepare a pigment solution with a concentration of 0.5% with a citric acid-sodium dihydrogen phosphate buffer solution with a pH value of 3.0, centrifuge at 12000 rpm for 10 min, and take the supernatant solution;

[0041] 2) Preparation of wall material solution: use citric acid-sodium dihydrogen phosphate buffer solution with a pH value of 3.0 as solvent, prepare 2% sodium alginate solution, heat and dissolve in a water bath at 60°C, and cool;

[0042] 3) Homogenous mixing: mix the core material and wall material in a ratio of 1:2 (v / v), and stir until the color is uniform;

[0043] 4) Preparation of coagulant: prepare 2% calcium chloride with a citric acid-sodium dihydrogen phosphate buffer solution with ...

Embodiment 2

[0049] Embodiment 2 purple heart sweet potato pigment microcapsules

[0050] Step is with embodiment 1.

[0051] The concentration of sodium alginate solution is 3%; The concentration of gelatin solution is 1%, and sodium alginate solution and gelatin solution are mixed according to the volume ratio of 2: 1 to prepare wall material solution; The ratio of core material and wall material is 1: 4 ( volume ratio); coagulant with 2% calcium chloride; curing time 3h.

[0052] The purple heart sweet potato pigment microcapsules prepared by this method have a moderate beading speed; the formed beads are complete, full and round in appearance, and the bead strength is good; the embedding rate of the pigment is 91.8%.

Embodiment 3

[0053] Embodiment 3 purple heart sweet potato pigment microcapsules

[0054] Step is with embodiment 1.

[0055] The concentration of the sodium alginate solution is 4%, the concentration of the gelatin solution is 1%, and the sodium alginate solution and the gelatin solution are mixed according to a volume ratio of 1:1 to prepare a wall material solution; the ratio of the core material to the wall material is 1:2; The coagulant uses 1% calcium chloride; the curing time is 2h.

[0056]The purple sweet potato pigment prepared by this method is a small purple-red particle with a plump and round shape, moderate bead strength, and a pigment embedding rate of 92.4%.

[0057] As can be seen from the above three examples, the obtained purple heart sweet potato pigment microcapsules prepared by the method of Example 1 are not only difficult to form beads, but also the formed microcapsules are easy to stick together, and the bead strength is poor, and the pigment embedding rate is ver...

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PUM

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Abstract

The invention discloses a method for preparing purple sweet potato pigment microcapsules. The method comprises the following steps of: mixing purple sweet potato pigment serving as a core material and sodium alginate and gelatin serving as a wall material in a buffer system with pH value of 2.0 to 4.0 and uniformly stirring the mixture; adding the mixture into the coagulator calcium chloride; andcuring, filtering and drying the mixture to obtain the microcapsules. The method has no toxic effect on a human body, ensures the physicochemical property of the core material and has biocompatibility with the core material by selecting proper encapsulating wall material. The preparation method of the invention has simple operation, improves the stability of the purple sweet potato pigment, enhances the coloring effect, expands the application range, effectively overcomes the defect existing in the use of the purple sweet potato pigment and has great economic value.

Description

technical field [0001] The invention relates to the technical field of food additives, in particular to the field of natural pigments, in particular to a preparation method of purple heart sweet potato pigment microcapsules. Background technique [0002] Food coloring is an important category of food additives, including synthetic pigments and natural pigments. Most of the synthetic pigments are synthesized from substances such as tar containing benzene rings and naphthalene rings, and have certain toxicity. In recent years, the toxicity of synthetic pigments has attracted more and more attention, and consumers tend to buy products made with natural pigments. [0003] Compared with synthetic pigments, natural pigments have the following advantages: (1) no toxic and side effects, high safety; (2) contain nutrients necessary for the human body; (3) some natural pigments have certain pharmacological effects. However, natural pigments also have the following defects: weak dyei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B67/02C09B61/00B01J13/04
Inventor 高峰郭炜绵郑明珠郭威杨占苗
Owner SOUTH CHINA NORMAL UNIVERSITY
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