Method for extracting water soluble red pigment from pulp and pericarp of dragon fruit

A technology of dragon fruit peel and dragon fruit, which is applied in the field of obtaining natural edible red pigment, and achieves the effects of simple installation, safe and reliable use, and reduced workshop construction area

Inactive Publication Date: 2005-06-29
冯畅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far there is no extraction method for the water-soluble red pigment of this new type of fruit

Method used

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  • Method for extracting water soluble red pigment from pulp and pericarp of dragon fruit
  • Method for extracting water soluble red pigment from pulp and pericarp of dragon fruit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 300 grams of dragon fruit, wash and peel;

[0028] Cut the pulp into pieces, put it in a refrigerator at -18°C, freeze it for 8 hours, take it out, thaw it at room temperature, press lightly with a stick, the pigment solution will automatically flow out from the fruit, and use centrifugation to collect 154 grams of the separation liquid;

[0029] The residue was extracted with a total of 140 grams of 1:1 ethanol, separated, discarded the residue, and combined twice to obtain 280 grams of liquid;

[0030] Distill under reduced pressure on a water bath at 70°C, the vacuum is 0.08Ppak to recover ethanol, then add 75% ethanol to the residue, pigmentation, Dow reverse osmosis membrane in the solution, the pressure of the reverse osmosis membrane is 35Kg / cm 2 , concentrated to remove water, dried in 800w microwave oven for 1 minute to obtain 6 grams of pigment solids, absorbance E 1 cm 1 ...

Embodiment 2

[0032] Take 300 grams of dragon fruit, wash and peel;

[0033] Cut the pulp into pieces, put it in a refrigerator at -20°C, freeze it for 8 hours, take it out, thaw it at room temperature, press lightly with a stick, the pigment solution will flow out of the fruit automatically, and use centrifugation to collect 158 ​​grams of the separation liquid;

[0034] The residue was leached with a total of 145 grams of 1:1 ethanol, separated, discarded the residue, combined twice to obtain 290 grams of liquid,

[0035] Distill under reduced pressure on a water bath at 70°C, the vacuum is 0.08Ppak to recover ethanol, then add 75% ethanol to the residue, pigmentation, Dow reverse osmosis membrane in the solution, the pressure of the reverse osmosis membrane is 35Kg / cm 2 , concentrated to remove water, dried in 800w microwave oven 800w for 1 minute to obtain 6.05 grams of pigment solids, absorbance E 1 cm 1 ...

Embodiment 3

[0037] 200g pitaya peel was dried in microwave oven for 3 minutes to make it easy to break.

[0038] Crush the dried pitaya peel, add 200ml of 40% ethanol, extract twice, and distill the pigment solution under reduced pressure on a water bath at 70°C, recover the ethanol, add 100ml of citric acid buffer solution with a pH value of 5 to dissolve the residue , filter, use reverse osmosis membrane to remove water and concentrate, the pressure of reverse osmosis membrane is 35Kg / cm 2 , 1.5 g of product was obtained by microwave drying with 800w microwave oven for 1 minute.

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Abstract

A method for abstructing hydrosoluble haematochrome from flesh and peel, which has the characteristics that crack the shell of with red flesh and peel, then press and centrifuge to get the separating medium, abstract extracting solution by alcohol, mix the separating medium and extracting solution to be pigment solution which is changed to be that with pigment through reduced pressure distillation for recycling alcohol, then use alcohol to refinie, clear water away by reverse osmosis and dry it be the product. Its peel is dried in micro-wave oven, which is then scattered, with alcohol being added into, get the pigmen solution which is then placed into micro-wave oven, through reduced pressure distillation to recycle alcohol, with the remainder being added with buffer solution whose PH value is separating medium being dissolved, filtered and cleared water by reverse osmosis, then dried by bain marie with high efficiency. The invention has kept the natural biological active pigmen components.

Description

Technical field: [0001] The invention relates to a method for obtaining natural edible red pigment. Background technique: [0002] Natural food coloring is an inherent ingredient in natural food, safe to use, and has some special biologically active functions, such as its anti-oxidation, blood fat-lowering, anti-tumor effects, etc. Therefore, the development and research of natural coloring is of great significance. [0003] The early development of natural red pigment is capsanthin, but this pigment is oil-soluble and insoluble in water, so the scope of use is greatly limited. Some countries, such as Japan, add chemical substances such as emulsifiers and thickeners to the red pigment to make it dispersible in water for market needs. But this obviously changes the nature of natural pigment green food and reduces the quality. [0004] At present, for the extraction of natural pigments, the tissue containing pigments is generally stirred and crushed with a high-speed machine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00
Inventor 钱生球张桂年
Owner 冯畅
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