CN108384275B - A method of improving black rice pigments stability - Google Patents
A method of improving black rice pigments stability Download PDFInfo
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- CN108384275B CN108384275B CN201810183250.1A CN201810183250A CN108384275B CN 108384275 B CN108384275 B CN 108384275B CN 201810183250 A CN201810183250 A CN 201810183250A CN 108384275 B CN108384275 B CN 108384275B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B61/00—Dyes of natural origin prepared from natural sources, e.g. vegetable sources
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
- C09B67/0001—Post-treatment of organic pigments or dyes
- C09B67/0014—Influencing the physical properties by treatment with a liquid, e.g. solvents
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Abstract
The invention discloses a kind of methods for improving black rice pigments stability, including deacetylated konjaku glucomannan is mixed in a certain ratio with black rice pigments, obtain black rice pigments product；Wherein, in black rice pigments product, the weight ratio of deacetylated konjaku glucomannan and black rice pigments is 1:1~20:1.The method disclosed by the invention for improving black rice pigments stability effectively increases the stability of black rice pigments, the natural colored of long-term preservation black rice pigments is full, malleable does not fade, with superior application value, method is easy, easy to operate, safety and environmental protection is reproducible, it is low in cost, it is advantageously implemented industrialization and expands application.
Description
Technical field
The present invention relates to natural pigment technical field more particularly to a kind of methods for improving black rice pigments stability.
Background technique
Black rice pigments are the water-soluble anthocyan natural pigments extracted from black purple paddy kind skin.Its main flower
Green element includes Cyanidin -3- glucoside, Cyanidin -3-5- diglucoside, fish pelargonium -3,5- diglucoside, Chinese herbaceous peony
Element -3- glucoside, high mallow element -3- glucoside.Black rice pigments can be added to drink as a kind of natural colorant in right amount
In the food such as material, assembled alcoholic drinks, bread.It also has very strong bioactivity simultaneously, can improve hypoferric anemia, anti-cardiovascular disease
It is sick, anti-oxidant, anti-inflammatory, antitumor.
Influence of the stability of black rice pigments vulnerable to factors such as illumination, temperature, oxidant, pH, metal ions, structure meeting
Hydrolysis or degradation occurs, to influence the stability of its color and the shelf life of product, largely limits black rice pigments
In food deep processing and the further development of related fields.
The problem of improving black rice pigments stability is always by researcher's extensive concern.Used by improving its stability at present
Method, which is specifically included that, carries out chemical modification such as acylation, ether, the food such as addition salt, antioxidant to anthocyanidin molecule
Additive；Anthocyanidin is carried out microcapsule embedded；The auxiliary color factor is added, such as organic acid, protein, flavonoids；In life
It produces, store, avoid contacting with metals such as Fe2+, Fe3+, Cu2+ in transportational process.But these methods are complicated for operation, poor repeatability
And easily change many deficiencies such as the natural colored of black rice pigments, ineffective and processing cost steady in a long-term be higher.
Therefore, those skilled in the art is dedicated to developing a kind of method for improving black rice pigments stability.
Summary of the invention
In view of the above drawbacks of the prior art, the technical problem to be solved by the present invention is to existing raising black rice pigments are steady
Qualitative method is complicated for operation, poor repeatability, easily changes the natural colored of black rice pigments, steady in a long-term ineffective.
To achieve the above object, the present invention provides a kind of methods for improving black rice pigments stability, including will be deacetylated
Konjaku glucomannan is mixed in a certain ratio with black rice pigments, obtains black rice pigments product；Wherein, it in black rice pigments product, takes off
The weight (gram) of acetyl konjaku glucomannan and black rice pigments is than being 1:1~20:1.
Further, the method for improving black rice pigments stability, comprising the following steps:
Step 1: preparing deacetylated konjaku glucomannan；
Step 2: deacetylated konjaku glucomannan prepared by step 1 is formulated as deacetylated konjak portuguese gansu polyose sugar juice；
Step 3: black rice pigments are formulated as black rice pigments solution；
Step 4: the deacetylated konjak portuguese gansu polyose sugar juice that step 2 is obtained and the black rice pigments solution of step 3 are isometric
Mixing, obtains liquid black rice pigments product.
Further, the step 1 prepares deacetylated konjaku glucomannan, and specific steps include:
Step 1-1: konjaku glucomannan is added in ethanol water, prepares the konjaku that percentage composition is 5%~25%
Glucomannan solution；
Step 1-2: the konjak portuguese gansu polyose sugar juice that step 1-1 is obtained carries out water-bath and stirring, and alkali compounds is added
PH value is adjusted, deacetylated konjaku glucomannan reaction solution is obtained；
Step 1-3: ethanol water washing is added in the deacetylated konjaku glucomannan reaction solution that step 1-2 is obtained, and takes out
Filter, freeze-drying, obtains deacetylated konjaku glucomannan.
Further, in the step 2, the bulking value (mg/ml) of deacetylated konjak portuguese gansu polyose sugar juice is prepared
Than for 1:1~20:1；Preferably 2:1~10:1；
Further, in the step 3, the bulking value (mg/ml) of black rice pigments solution is prepared than being 1:1~2:
1；Preferably 1:1.
Further, in the step 1-1, the percentage composition of ethyl alcohol is 20%~90% in the ethanol water；
Further, in the step 1-1, the be possessed percentage of taro Glucomannan of konjak portuguese gansu polyose sugar juice of preparing contains
Amount is 10%~20%；
Further, in the step 1-2, the temperature of the water-bath is 35~50 DEG C；
Further, in the step 1-2, the speed of the stirring is 100~200r/min；
Further, in the step 1-2,20~40min of water-bath and stirring before alkali compounds tune pH value is added；
Further, in the step 1-2,10~60min of water-bath again and stirring is added after alkali compounds tune pH value；Into
One step, in the step 1-2, the alkali compounds that contains is sodium hydroxide, potassium hydroxide；It is preferred that sodium hydroxide；
Further, in the step 1-2, the tune pH value is 10~12；
Further, in the step 1-3, the percentage composition of ethyl alcohol is 60%~90% in the ethanol water；
Further, in the step 1-3, after the ethanol water washing, deacetylated konjaku glucomannan reaction solution
PH value is 7；
Further, in the step 1-3, alcohol is volatilized in draught cupboard after suction filtration, is then freeze-dried again, is obtained
Deacetylated konjaku glucomannan.
Further, the method for improving black rice pigments stability, deacetylated konjaku Portugal in liquid black rice pigments product
The weight (gram) of sweet glycan and black rice pigments is than being 2:1~10:1.
In better embodiment of the invention, in the step 1-1, the percentage composition of ethyl alcohol in the ethanol water
It is 40%~60%；
In another better embodiment of the invention, in the step 1-1, the percentage of ethyl alcohol in the ethanol water
Content is 40%；
In another better embodiment of the invention, in the step 1-1, the percentage of ethyl alcohol in the ethanol water
Content is 50%；
In another better embodiment of the invention, in the step 1-1, the hundred of ethyl alcohol in the ethanol water
Dividing content is 60%；
In better embodiment of the invention, in the step 1-1, the preparation konjak portuguese gansu polyose sugar juice is possessed taro
The percentage composition of Glucomannan is 10%；
In another better embodiment of the invention, in the step 1-1, in the preparation konjak portuguese gansu polyose sugar juice
The percentage composition of konjaku glucomannan is 15%；
In another better embodiment of the invention, in the step 1-1, in the preparation konjak portuguese gansu polyose sugar juice
The percentage composition of konjaku glucomannan is 20%；
In better embodiment of the invention, in the step 1-2, the temperature of the water-bath is 35 DEG C；
In another better embodiment of the invention, in the step 1-2, the temperature of the water-bath is 40 DEG C；
In another better embodiment of the invention, in the step 1-2, the temperature of the water-bath is 45 DEG C；
In another better embodiment of the invention, in the step 1-2, the temperature of the water-bath is 50 DEG C；
In better embodiment of the invention, in the step 1-2, the speed of the stirring is 100r/min；
In another better embodiment of the invention, in the step 1-2, the speed of the stirring is 150r/min；
In another better embodiment of the invention, in the step 1-2, the speed of the stirring is 200r/min；
In better embodiment of the invention, in the step 1-2, water-bath and stirred before alkali compounds tune pH value is added
Mix 20min；
In another better embodiment of the invention, in the step 1-2, water-bath before alkali compounds tune pH value is added
With stirring 30min；
In another better embodiment of the invention, in the step 1-2, water-bath before alkali compounds tune pH value is added
With stirring 40min；
In better embodiment of the invention, in the step 1-2, the tune pH value is 10；
In another better embodiment of the invention, in the step 1-2, the tune pH value is 11；
In another better embodiment of the invention, in the step 1-2, the tune pH value is 12；
In better embodiment of the invention, in the step 1-3, the percentage composition of ethyl alcohol in the ethanol water
It is 60%；
In another better embodiment of the invention, in the step 1-3, the percentage of ethyl alcohol in the ethanol water
Content is 70%；
In another better embodiment of the invention, in the step 1-3, the percentage of ethyl alcohol in the ethanol water
Content is 90%；
In better embodiment of the invention, in the step 2, the weight of deacetylated konjak portuguese gansu polyose sugar juice is prepared
Volume (mg/ml) is than being 1:1；
In another better embodiment of the invention, in the step 2, deacetylated konjak portuguese gansu polyose sugar juice is prepared
Bulking value (mg/ml) is than being 2:1；
In another better embodiment of the invention, in the step 2, deacetylated konjak portuguese gansu polyose sugar juice is prepared
Bulking value (mg/ml) is than being 5:1；
In another better embodiment of the invention, in the step 2, deacetylated konjak portuguese gansu polyose sugar juice is prepared
Bulking value (mg/ml) is than being 10:1；
In another better embodiment of the invention, in the step 2, deacetylated konjak portuguese gansu polyose sugar juice is prepared
Bulking value (mg/ml) is than being 20:1；
In better embodiment of the invention, in the step 3, prepare black rice pigments solution bulking value (milligram/
Milliliter) than being 1:1；
In another better embodiment of the invention, in the step 3, the bulking value of black rice pigments solution is prepared
(mg/ml) is than being 2:1；
In better embodiment of the invention, the method for improving black rice pigments stability, liquid black rice pigments are produced
The weight (gram) of deacetylated konjaku glucomannan and black rice pigments is than being 1:1 in product；
In another better embodiment of the invention, the method for improving black rice pigments stability, liquid black rice color
The weight (gram) of deacetylated konjaku glucomannan and black rice pigments is than being 2:1 in plain product；
In another better embodiment of the invention, the method for improving black rice pigments stability, liquid black rice color
The weight (gram) of deacetylated konjaku glucomannan and black rice pigments is than being 5:1 in plain product；
In another better embodiment of the invention, the method for improving black rice pigments stability, liquid black rice color
The weight (gram) of deacetylated konjaku glucomannan and black rice pigments is than being 10:1 in plain product；
In another better embodiment of the invention, the method for improving black rice pigments stability, liquid black rice color
The weight (gram) of deacetylated konjaku glucomannan and black rice pigments is than being 20:1 in plain product.
Using above scheme, the method disclosed by the invention for improving black rice pigments stability is had the advantage that
(1) method that the present invention improves black rice pigments stability, by adding and optimizing deacetylated konjaku glucomannan
Additive amount is mixed in a certain proportion deacetylated konjaku glucomannan in black rice pigments product with black rice pigments, improves it mutually
Effect effectively increases the stability of black rice pigments, and the natural colored of long-term preservation black rice pigments is full, malleable does not fade；
(2) method that the present invention improves black rice pigments stability, easy to operate, mild condition, no security risk, repeatability
Good, post-processing is simple free from environmental pollution, low in cost, is advantageously implemented industrialization and expands application.
In conclusion the method disclosed by the invention for improving black rice pigments stability improves the stability of black rice pigments,
The natural colored of long-term preservation black rice pigments is full, malleable does not fade, and has superior application value.Method is easy, easily
Operation, safety and environmental protection is reproducible, low in cost, is advantageously implemented industrialization and expands application.
Below with reference to technical effect of the drawings and examples to design of the invention, specific technical solution and generation make into
One step explanation, to fully understand the purposes, features and effects of the present invention.
Detailed description of the invention
Fig. 1 is the Detection of Stability result schematic diagram of 12 liquid black rice pigments product of test example.
Specific embodiment
Multiple preferred embodiments of the invention introduced below keep its technology contents more clear and are easy to understand.The present invention
It can be emerged from by many various forms of embodiments, these embodiments are exemplary description, protection model of the invention
Enclose the embodiment for being not limited only to mention in text.
If there is test method without specific conditions, usually according to normal condition, such as instructions book or handbook
Implemented.
Embodiment 1 prepares black rice pigments product
It takes konjaku glucomannan as natural polysaccharide raw material, is added in 50% ethanol water, be configured to 15wt% evil spirit
Taro Glucomannan solution；
The konjak portuguese gansu polyose sugar juice of preparation is subjected to water bath processing, 40 DEG C of temperature, mixing speed 150r/min, is handled
30min, it is 11 that NaOH tune pH, which is then added, reprocesses 30min, obtains deacetylated konjaku glucomannan reaction after the reaction was completed
Liquid；
Deacetylated konjaku glucomannan reaction solution is used into 60%, 70%, 90% ethanol water washing reaction repeatedly respectively
Object removes excessive alkali, until pH is 7, filters, volatilizes in draught cupboard alcohol (i.e. ethyl alcohol), is freeze-dried, obtains powdered
Deacetylated konjaku glucomannan；
Deacetylated konjaku glucomannan is configured to the solution of 2mg/mL；
Black rice pigments are formulated as to the black rice pigments solution of 1mg/mL；
Above-mentioned deacetylated konjak portuguese gansu polyose sugar juice is mixed in equal volume with black rice pigments solution, obtains liquid black rice pigments
Product.
Embodiment 2: black rice pigments product is prepared
It takes konjaku glucomannan as natural polysaccharide raw material, is added in 50% ethanol water, be configured to 15wt% evil spirit
Taro Glucomannan solution；
The konjak portuguese gansu polyose sugar juice of preparation is subjected to water bath processing, 40 DEG C of temperature, mixing speed 150r/min, is handled
30min, it is 11 that NaOH tune pH, which is then added, reprocesses 30min, obtains deacetylated konjaku glucomannan reaction after the reaction was completed
Liquid；
Deacetylated konjaku glucomannan reaction solution is used into 60%, 70%, 90% ethanol water washing reaction repeatedly respectively
Object removes excessive alkali, until pH is 7, filters, alcohol is volatilized in draught cupboard, be freeze-dried, obtain powdered deacetylated evil spirit
Taro Glucomannan；
Deacetylated konjaku glucomannan is configured to the solution of 5mg/mL；
Black rice pigments are formulated as to the black rice pigments solution of 1mg/mL；
Above-mentioned deacetylated konjak portuguese gansu polyose sugar juice is mixed in equal volume with black rice pigments solution, obtains liquid black rice pigments
Product.
Embodiment 3: black rice pigments product is prepared
It takes konjaku glucomannan as natural polysaccharide raw material, is added in 50% ethanol water, be configured to 15wt% evil spirit
Taro Glucomannan solution；
The konjak portuguese gansu polyose sugar juice of preparation is subjected to water bath processing, 40 DEG C of temperature, mixing speed 150r/min, is handled
30min, it is 11 that NaOH tune pH, which is then added, reprocesses 30min, obtains deacetylated konjaku glucomannan reaction after the reaction was completed
Liquid；
Deacetylated konjaku glucomannan reaction solution is used into 60%, 70%, 90% ethanol water washing reaction repeatedly respectively
Object removes excessive alkali, until pH is 7, filters, alcohol is volatilized in draught cupboard, be freeze-dried, obtain powdered deacetylated evil spirit
Taro Glucomannan；
Deacetylated konjaku glucomannan is configured to the solution of 10mg/mL；
Black rice pigments are formulated as to the black rice pigments solution of 1mg/mL；
Above-mentioned deacetylated konjak portuguese gansu polyose sugar juice is mixed in equal volume with black rice pigments solution, obtains liquid black rice pigments
Product.
Embodiment 4: black rice pigments product is prepared
It takes konjaku glucomannan as natural polysaccharide raw material, is added in 40% ethanol water, be configured to 10wt% evil spirit
Taro Glucomannan solution；
The konjak portuguese gansu polyose sugar juice of preparation is subjected to water bath processing, 35 DEG C of temperature, mixing speed 200r/min, is handled
30min, it is 10 that NaOH tune pH, which is then added, reprocesses 30min, obtains deacetylated konjaku glucomannan reaction after the reaction was completed
Liquid；
Deacetylated konjaku glucomannan reaction solution is used into 60%, 70%, 90% ethanol water washing reaction repeatedly respectively
Object removes excessive alkali, until pH is 7, filters, alcohol is volatilized in draught cupboard, be freeze-dried, obtain powdered deacetylated evil spirit
Taro Glucomannan；
Deacetylated konjaku glucomannan is configured to the solution of 2mg/mL；
Black rice pigments are formulated as to the black rice pigments solution of 2mg/mL；
Above-mentioned deacetylated konjak portuguese gansu polyose sugar juice is mixed in equal volume with black rice pigments solution, obtains liquid black rice pigments
Product.
Embodiment 5: black rice pigments product is prepared
It takes konjaku glucomannan as natural polysaccharide raw material, is added in 60% ethanol water, be configured to 20wt% evil spirit
Taro Glucomannan solution；
The konjak portuguese gansu polyose sugar juice of preparation is subjected to water bath processing, temperature 45 C, mixing speed 100r/min, processing
30min, it is 12 that NaOH tune pH, which is then added, reprocesses 30min, obtains deacetylated konjaku glucomannan reaction after the reaction was completed
Liquid；
Deacetylated konjaku glucomannan reaction solution is used into 60%, 70%, 90% ethanol water washing reaction repeatedly respectively
Object removes excessive alkali, until pH is 7, filters, alcohol is volatilized in draught cupboard, be freeze-dried, obtain powdered deacetylated evil spirit
Taro Glucomannan；
Deacetylated konjaku glucomannan is configured to the solution of 20mg/mL；
Black rice pigments are formulated as to the black rice pigments solution of 2mg/mL；
Above-mentioned deacetylated konjak portuguese gansu polyose sugar juice is mixed in equal volume with black rice pigments solution, obtains liquid black rice pigments
Product.
Embodiment 6: black rice pigments product is prepared
It takes konjaku glucomannan as natural polysaccharide raw material, is added in 20% ethanol water, be configured to 25wt% evil spirit
Taro Glucomannan solution；
The konjak portuguese gansu polyose sugar juice of preparation is subjected to water bath processing, temperature 50 C, mixing speed 200r/min, processing
20min, it is 11 that NaOH tune pH, which is then added, reprocesses 30min, obtains deacetylated konjaku glucomannan reaction after the reaction was completed
Liquid；
Deacetylated konjaku glucomannan reaction solution is used into 60%, 70%, 90% ethanol water washing reaction repeatedly respectively
Object removes excessive alkali, until pH is 7, filters, alcohol is volatilized in draught cupboard, be freeze-dried, obtain powdered deacetylated evil spirit
Taro Glucomannan；
Deacetylated konjaku glucomannan is configured to the solution of 1mg/mL；
Black rice pigments are formulated as to the black rice pigments solution of 1mg/mL；
Above-mentioned deacetylated konjak portuguese gansu polyose sugar juice is mixed in equal volume with black rice pigments solution, obtains liquid black rice pigments
Product.
Embodiment 7: black rice pigments product is prepared
It takes konjaku glucomannan as natural polysaccharide raw material, is added in 90% ethanol water, be configured to 5wt% konjaku
Glucomannan solution；
The konjak portuguese gansu polyose sugar juice of preparation is subjected to water bath processing, temperature 45 C, mixing speed 150r/min, processing
35min, it is 11 that NaOH tune pH, which is then added, reprocesses 30min, obtains deacetylated konjaku glucomannan reaction after the reaction was completed
Liquid；
Deacetylated konjaku glucomannan reaction solution is washed with 60%, 70%, 90% ethanol water to reaction pH respectively
It is 7, filters, freeze-drying obtains powdered deacetylated konjaku glucomannan；
Deacetylated konjaku glucomannan is configured to the solution of 20mg/mL；
Black rice pigments are formulated as to the black rice pigments solution of 1mg/mL；
Above-mentioned deacetylated konjak portuguese gansu polyose sugar juice is mixed in equal volume with black rice pigments solution, obtains liquid black rice pigments
Product.
Comparative example 8:
Black rice pigments are formulated as to the black rice pigments solution of 1mg/mL；
Water is mixed in equal volume with the black rice pigments solution of above-mentioned 1mg/mL, obtains liquid black rice pigments product.
Comparative example 9:
Konjaku glucomannan is configured to the solution of 2mg/mL；
Black rice pigments are formulated as to the black rice pigments solution of 1mg/mL；
Above-mentioned konjak portuguese gansu polyose sugar juice is mixed in equal volume with black rice pigments solution, obtains liquid black rice pigments product.
Comparative example 10:
Konjaku glucomannan is configured to the solution of 5mg/mL；
Black rice pigments are formulated as to the black rice pigments solution of 1mg/mL；
Above-mentioned konjak portuguese gansu polyose sugar juice is mixed in equal volume with black rice pigments solution, obtains liquid black rice pigments product.
Comparative example 11:
Konjaku glucomannan is configured to the solution of 10mg/mL；
Black rice pigments are formulated as to the black rice pigments solution of 1mg/mL；
Above-mentioned konjak portuguese gansu polyose sugar juice is mixed in equal volume with black rice pigments solution, obtains liquid black rice pigments product.
Test example 12: the stability of detection black rice pigments product
Liquid black rice pigments prepared by the liquid black rice pigments product and comparative example 8~11 for taking above-described embodiment 1~3 to prepare
Product respectively simultaneously 90 DEG C of water-baths after twenty minutes, detection calculates the degradation rate for analyzing black rice pigments in each product；
Through detecting, as a result as shown in Figure 1,
Degradation rate of the liquid black rice pigments product that embodiment 1 is prepared under the conditions of 90 DEG C, water-bath 20 minutes be
29.3%；
Degradation rate of the liquid black rice pigments product that embodiment 2 is prepared under the conditions of 90 DEG C, water-bath 20 minutes be
24.1%；
Degradation rate of the liquid black rice pigments product that embodiment 3 is prepared under the conditions of 90 DEG C, water-bath 20 minutes be
19.7%；
Degradation rate of the liquid black rice pigments product that comparative example 8 is prepared under the conditions of 90 DEG C, water-bath 20 minutes be
47.6%；
Degradation rate of the liquid black rice pigments product that comparative example 9 is prepared under the conditions of 90 DEG C, water-bath 20 minutes be
38.1%；
Degradation rate of the liquid black rice pigments product that comparative example 10 is prepared under the conditions of 90 DEG C, water-bath 20 minutes be
36.3%；
Degradation rate of the liquid black rice pigments product that comparative example 11 is prepared under the conditions of 90 DEG C, water-bath 20 minutes be
32.0%；(data of the comparative example are not shown in FIG. 1)
Data comparison is as it can be seen that the liquid black rice pigments product not containing deacetylated konjaku glucomannan relative to comparative example 8
47.6% degradation rate, the liquid black rice pigments product degradation rate that the embodiment of the present invention 1~3 is prepared be not higher than 30%,
Show superior stability；
In comparative example 9, the weight ratio of konjaku glucomannan and black rice pigments is 2:1 in liquid black rice pigments product, is implemented
In example 1, the weight ratio of deacetylated konjaku glucomannan and black rice pigments is 2:1, the liquid of comparative example 9 in liquid black rice pigments product
The degradation rate of state black rice pigments product is 38.1%, the liquid black rice pigments product degradation that the embodiment of the present invention 1 is prepared
Rate is 29.3%；
In comparative example 10, the weight ratio of konjaku glucomannan and black rice pigments is 5:1 in liquid black rice pigments product, is implemented
In example 2, the weight ratio of deacetylated konjaku glucomannan and black rice pigments is 5:1 in liquid black rice pigments product；Comparative example 10
The degradation rate of liquid black rice pigments product is 36.3%, the liquid black rice pigments product drop that the embodiment of the present invention 2 is prepared
Solution rate is 24.1%；
In the case of showing same weight ratio, the liquid black rice pigments product ratio containing deacetylated konjaku glucomannan, which contains, not to be taken off
The liquid black rice pigments product of acetyl konjaku glucomannan shows superior stability.
Liquid black rice pigments product made from other embodiments of the invention has performance for stability similar to above.
Other embodiments technical solution of the present invention also has beneficial effect similar to above.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that the ordinary skill of this field is without wound
The property made labour can design according to the present invention makes many modifications and variations, adjustment, temperature such as containing weight percent, when
Between, each parameter such as pH value adjusts in the reasonable scope.Therefore, all technician in the art exist under this invention's idea
It, all should be by weighing by logic analysis, reasoning or the limited available technical solution of test on the basis of the prior art
In protection scope determined by sharp claim.
Claims (10)
1. a kind of method for improving black rice pigments stability, which is characterized in that including by deacetylated konjaku glucomannan and black rice
Pigment is mixed in a certain ratio, and obtains black rice pigments product；Wherein, in black rice pigments product, deacetylated konjaku glucomannan with
The weight ratio of black rice pigments is 1:1~20:1.
2. method as described in claim 1, which comprises the following steps:
Step 1: preparing deacetylated konjaku glucomannan；
Step 2: deacetylated konjaku glucomannan prepared by step 1 is formulated as deacetylated konjak portuguese gansu polyose sugar juice；
Step 3: black rice pigments are formulated as black rice pigments solution；
Step 4: the deacetylated konjak portuguese gansu polyose sugar juice that step 2 is obtained mixes in equal volume with the black rice pigments solution of step 3,
Obtain liquid black rice pigments product.
3. method as claimed in claim 2, which is characterized in that in the step 1, prepare the specific of deacetylated konjaku glucomannan
Step includes:
Step 1-1: konjaku glucomannan is added in ethanol water, prepares the Amorphophallus rivieri glucomannan that percentage composition is 5%~25%
Glycan solution；
Step 1-2: the konjak portuguese gansu polyose sugar juice that step 1-1 is obtained carries out water-bath and stirring, and alkali compounds tune pH is added
Value, obtains deacetylated konjaku glucomannan reaction solution；
Step 1-3: ethanol water washing is added in the deacetylated konjaku glucomannan reaction solution that step 1-2 is obtained, and filters, cold
It is lyophilized dry, obtains deacetylated konjaku glucomannan.
4. method as claimed in claim 2, which is characterized in that in the step 2, prepare deacetylated konjak portuguese gansu polyose sugar juice
W/v is 1:1~20:1, and wherein the unit of bulking value is mg/ml.
5. method as claimed in claim 2, which is characterized in that in the step 3, prepare the w/v of black rice pigments solution
For 1:1~2:1, wherein the unit of bulking value is mg/ml.
6. method as claimed in claim 3, which is characterized in that in the step 1-1,
The percentage composition of ethyl alcohol is 20%~90% in the ethanol water；
It is described prepare konjak portuguese gansu polyose sugar juice be possessed taro Glucomannan percentage composition be 10%~20%.
7. method as claimed in claim 3, which is characterized in that in the step 1-2,
The temperature of the water-bath is 35~50 DEG C；
The speed of the stirring is 100~200r/min；
20~40min of water-bath and stirring before addition alkali compounds tune pH value；
Water-bath again and stirring 10-60min are added after alkali compounds tune pH value；
The alkali compounds that contains is sodium hydroxide, potassium hydroxide；
The tune pH value is 10~12.
8. method as claimed in claim 3, which is characterized in that in the step 1-3,
The percentage composition of ethyl alcohol is 60%~90% in the ethanol water；
After the ethanol water washing, deacetylated konjaku glucomannan reacting liquid pH value is 7.
9. such as any one of claim 1~8 the method, which is characterized in that deacetylated konjaku Portugal in the black rice pigments product
The weight ratio of sweet glycan and black rice pigments is 2:1~10:1.
10. the black rice pigments product that a kind of any one of claim 1~8 the method is prepared.
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