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Preparation method for high-purity pitaya pigment

A dragon fruit, high-purity technology, applied in chemical instruments and methods, organic dyes, natural dyes, etc., can solve the problems of limited resources, high production costs, waste of pigment resources, etc., and achieve environmental friendliness, easy operation, and low cost Effect

Inactive Publication Date: 2014-08-13
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main shortcoming of this method is: (1) adopt red pitaya pulp as raw material, not only resource is limited, and discard pericarp, production cost is higher, and the waste of pigment resource is bigger
(2) The use of distilled water as the leaching agent cannot fully dissolve and leach the pigment
(3) The extract is not degreased, and the purity (color value) of the pigment product is low
(4) Powdered pigment products cannot be directly produced, and the addition of excipients restricts the application process of pigments

Method used

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  • Preparation method for high-purity pitaya pigment
  • Preparation method for high-purity pitaya pigment
  • Preparation method for high-purity pitaya pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of preparation method of high-purity pitaya pigment, its concrete steps are as follows:

[0027] (1) Ultrasonic-assisted extraction method to prepare the initial extract of pitaya pigment. Wash the pitaya peel, put it in a water bath at 90°C for 30 seconds, take it out, shred it, freeze it at minus 20°C (-20°C) for 1 hour, and weigh it. Take 200g of the material sample and place it in a container with a volume of 1000ml, add 400ml of ethanol solution with a concentration of 40% by volume, and use a frequency of 40kHz ultrasonic assisted leaching for 45min to obtain a purple-red primary infusion.

[0028] (2) Purification of dragon fruit pigment initial infusion

[0029] Use the particle size of the extract in step (1) Suction filtration with a microporous membrane to obtain a clear purple solution; vacuum rotary evaporation at 40°C for 20 min to recover ethanol; mix the clear purple solution with petroleum ether at a volume ratio of 1:3, oscillate and separate,...

Embodiment 2

[0033] A preparation method of high-purity dragon fruit pigment. With embodiment 1, wherein:

[0034] In step (1), the ethanol volume percentage concentration is 30%, and the ultrasonic-assisted extraction time is 35min.

[0035] In step (2), the clear purple red solution was mixed with petroleum ether at a volume ratio of 1:2, the extraction was repeated 3 times, and vacuum rotation was performed at 35°C for 30 min.

[0036] In the (3) step, the deionized water was changed every 3 hours during dialysis, and the color value was measured.

Embodiment 3

[0038] A preparation method of high-purity dragon fruit pigment. With embodiment 1, wherein:

[0039] In step (1), the ethanol volume percentage concentration is 50%, and the ultrasonic-assisted extraction time is 55 min.

[0040] In step (2), the clear purple red solution was mixed with petroleum ether at a volume ratio of 1:4, the extraction was repeated 5 times, and vacuum rotation was performed at 55° C. for 20 minutes.

[0041] In the (3) step, the deionized water is changed every 5h during dialysis, and the color value is measured.

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Abstract

The invention relates to a preparation method for high-purity pitaya pigment, and belongs to the technical field of preparation methods of natural pigments. An ultrasonic-assisted extraction method, a millipore filtration pumping-filtration, dialysis and vacuum freeze-drying method are employed for preparing the high-purity pitaya pigment. The preparation method comprises the following steps: (1) performing cleaning, shredding and refrigeration on pitaya pericarp, employing an ethanol solution with a volume percentage concentration of 30%-50% and utilizing the ultrasonic-assisted extraction method to prepare a pitaya pigment preliminary-extraction solution; (2) performing pump filtration on the pitaya pigment preliminary-extraction solution by employing a millipore filtration membrane with a particle size of 0.22 mu m, so as to remove pectin, performing vacuum rotary evaporation to recover ethanol, adding petroleum ether for extraction and degreasing, and performing vacuum rotary evaporation to recover petroleum ether, so as to obtain a pure pigment extraction solution; and (3) employing a dialysis membrane with the molecular weight cut-off of 3500 to remove inorganic ions, sugar and the like, and performing vacuum freeze-drying to obtain high-purity pitaya pigment powder with aubergine color and with the color value E<1%>[1 cm]538 nm of 120.6, while the color value E<1%>[1 cm]538 nm of prepared pitaya pigment in reported related files is 60-90. The preparation method is abundant in employed raw material, low in cost, simple in operation and environment-friendly, helps to maintain the efficacy of pitaya pigment, and has wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of natural pigment preparation methods, in particular to a preparation method of high-purity dragon fruit pigment. Background technique [0002] Natural pigments are mainly extracted directly from animal and plant tissues and microorganisms (cultivation). Due to their good color and safety, they are widely used in food, medicine and cosmetics industries. Compared with artificial synthetic pigments, edible natural pigments not only have the advantages of non-toxicity, bright colors, and food safety, but also have certain nutritional effects. sex. Therefore, natural pigments have high research and development value, and are the most ideal substitutes for synthetic pigments. [0003] Pitaya peel contains a large amount of water-soluble natural pigment, and its color is bright purple, which is a high-quality raw material for the extraction and development of natural red pigment. Extracting high-quality natura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00
Inventor 刘成伦邹晶徐龙君
Owner CHONGQING UNIV
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