CN107593899A - A kind of method for suppressing fresh-cut water chestnut brown stain - Google Patents
A kind of method for suppressing fresh-cut water chestnut brown stain Download PDFInfo
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- CN107593899A CN107593899A CN201711069932.1A CN201711069932A CN107593899A CN 107593899 A CN107593899 A CN 107593899A CN 201711069932 A CN201711069932 A CN 201711069932A CN 107593899 A CN107593899 A CN 107593899A
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Abstract
The invention discloses a kind of method for being used to suppress fresh-cut water chestnut brown stain, select fresh water chestnut, circulating water is soaked after rinsing with acidic electrolytic water is peeled simultaneously, water chestnut after peeling is handled using compelx coating liquid, with the polythene film bag modified-atmosphere package that 0.015 0.02 mm are thick after fresh-cut water chestnut dry tack free, stored in 0 Cool Room 4 DEG C.The present invention carries out Preservation Treatment with the method that SiOx compelx coating liquid phase is combined using acidic electrolytic water, chitosan to fresh-cut water chestnut, solves the problems, such as the easy brown stain in processing and storage of fresh-cut water chestnut, and preferable quality can be kept within certain storage period.
Description
Technical field
The present invention relates to postharvest technology of fruits and vegetables field, more particularly to a kind of method for suppressing fresh-cut water chestnut brown stain.
Background technology
Water chestnut also known as horseshoe, Shui Li, black taro etc., southern china and India are originated in, its meat is pure white, sweet succulence, clear and melodious
It is tasty, it can both cook fruit and eat it raw, vegetables can be done again and eaten.The nutrition and health care value of water chestnut is high, has clearing heat and eliminating phlegm, promotes the production of body fluid out
Stomach, help digestion and sober up and other effects.But because of peeling and by serious machinery wound enzymatic easily occurs during shelf for fresh-cut water chestnut brown
Become (flavescence) and the quality deterioration problem such as ruin, this has had a strong impact on the edible quality and commodity value of product.Therefore, research and
It is particularly important to develop effective fresh-cut water chestnut browning inhibition method.
Electrolysis water is also known as electrolyzed functional water, oxidation-reduction potential water, is to electrolyze table salt or acidity that dilute hydrochloric acid solution obtains
The general name of electrolysis water and electrolyzed alkaline water, has that sterilizing ability is strong, bactericidal range is wide, noresidue, pollution-free, direct body contact
Non-hazardous, produce convenience, lower-price characteristic.
Chitosan, which has, suppresses bacterial activity, has important application value in fields such as medicine, weaving and food.
Processed and the browning in storage, University Of Agriculture and Forestry In Fujian's agricultural product postpartum skill to solve fresh-cut water chestnut
Art research institute has carried out more deep, systematic research to water chestnut postharvest biology characteristic, it is intended to which innovative development is a kind of to suppress fresh
The method for cutting water chestnut brown stain, efficiently control fresh-cut water chestnut quality deterioration.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of method for suppressing fresh-cut water chestnut brown stain, have
Control fresh-cut water chestnut quality deterioration to effect.
To achieve the above object, the present invention uses following technical scheme：
A kind of method for suppressing fresh-cut water chestnut brown stain, comprises the following steps：
1) pre-treatment：Select fresh water chestnut and cleaned with water；
2) acidic electrolytic water immersion is removed the peel simultaneously：Water chestnut after cleaning is immersed in acidic electrolytic water and soaks 15-25
Min, the pH value of the acidic electrolytic water is 2.0-3.5, and available chlorine content is 50-70 mg/L, while is removed the peel；
3) compelx coating liquid is handled：Water chestnut after peeling soaks 1-2 min using compelx coating liquid, the compelx coating liquid
Preparation method is as follows：SiOx nanoparticals are added in citric acid solution, ultrasonication 15-20 min, make its dispersed, then
Chitosan is added, ultrasonication 15-20 min are used again after stirring 50-60 min, then adjusts pH value to 5.8 with alkali lye, it is quiet
20-24 h are put, chitosan and SiOx compelx coating liquid is made；
Wherein, SiOx, citric acid solution, the amount ratio of chitosan are the g of 0.03-0.12 g: 100 mL: 1.0-2.5；
4) dry, pack, storage；After fresh-cut water chestnut dry tack free after above-mentioned processing, pack, storage.
Step 1）The water chestnut of selection be full, individual big, free from extraneous odour, without rot, no disease and pests harm, the fresh water chestnut without scabbing,
The water chestnut is rinsed with circulating water.
Step 2）Described acidic electrolytic water is prepared into using the clean peace HRW2500 acidic oxidized electric potential water process units of speed
Arrive.
Step 3）The concentration of described citric acid solution is 0.5-1.0 %.
Step 3）Described alkali lye is 1 mol/L NaOH solutions.
Step 4）It is described to be packaged as using polythene film bag modified-atmosphere package.
Further, the thickness of the polythene film bag is 0.015-0.02 mm.
Step 4）Described holding conditions are in 0-4 DEG C of refrigeration.
The present invention uses above technical scheme, is combined using acidic electrolytic water, chitosan with SiOx compelx coating liquid phase
Method to fresh-cut water chestnut carry out Preservation Treatment, solves the problems, such as fresh-cut water chestnut processing and storage in easy brown stain, and
Preferable quality can be kept within certain storage period.Wherein, can be reduced into completely after acidic electrolytic water sterilization nontoxic, noresidue
Light water, conventional industrial water can be substituted as a kind of safe green cleaning agent；Chitosan is as a kind of novel non-toxic, day
Right antistaling agent, water chestnut surface is coated on, pellicle can be formed on water chestnut surface, there is good film-forming property, good permeability,
Moisture evaporation and germ invasion and growth can be suppressed；SiOx nanoparticals are unformed white powder, are nontoxic, tasteless, pollution-free
Nonmetallic materials, tensile strength, elongation at break and the tearing strength of chitosan complex film can be improved；SiOx nanoparticals are added
In the filmogen of chitosan, easily combined with filmogen, improve the bond strength between film and matrix, improve the anti-ageing of film
Change performance, improve the air-tightness of film forming, strengthen fresh-keeping effect.
The present invention can effectively suppress fresh-cut water chestnut and brown stain occurs, and the fresh-cut water chestnut handled using the inventive method is stored
25 days, its color, smell, mouthfeel, quality kept good.
Brief description of the drawings
The present invention is described in more detail below in conjunction with the drawings and specific embodiments：
Fig. 1 is that the influence to fresh-cut water chestnut browning index is handled through embodiment 1 and the method for reference examples 1；
Fig. 2 is that the influence to fresh-cut water chestnut L values is handled through embodiment 1 and the method for reference examples 1；
Fig. 3 is that the influence to fresh-cut water chestnut relative conductivity is handled through embodiment 1 and the method for reference examples 1；
Fig. 4 is that the influence to fresh-cut water chestnut soluble solid content is handled through embodiment 1 and the method for reference examples 1；
Fig. 5 is that the influence to fresh-cut water chestnut weight-loss ratio is handled through embodiment 1 and the method for reference examples 1；
Fig. 6 is that the influence to fresh-cut water chestnut respiratory rate is handled through embodiment 1 and the method for reference examples 1；
Fig. 7 is that the influence to fresh-cut water chestnut PPO activity is handled through embodiment 1 and the method for reference examples 1；
Fig. 8 is that the influence to fresh-cut water chestnut total phenol content is handled through embodiment 1 and the method for reference examples 1.
Embodiment
A kind of method for suppressing fresh-cut water chestnut brown stain, comprises the following steps：
1) pre-treatment：Select full, individual big, free from extraneous odour, without rotten, no disease and pests harm, the fresh water chestnut without scabbing, use circulating water
Rinse, go the removal of impurity and part microorganism；
2) acidic electrolytic water immersion is removed the peel simultaneously：Water chestnut after cleaning is immersed in acidic electrolytic water and soaks 15-25
Min, the pH value of the acidic electrolytic water is 2.0-3.5, and available chlorine content is 50-70 mg/L, while is removed the peel；
Wherein, acidic electrolytic water is prepared using the clean peace HRW2500 acidic oxidized electric potential waters process units of speed；
3) compelx coating liquid is handled：Water chestnut after peeling is handled using compelx coating liquid（Soak 1-2 min）, the compound painting
The preparation method of film liquid is as follows：0.03-0.12 g SiOx nanoparticals are added in 100 mL 0.5-1.0 % citric acid solutions,
Ultrasonication 15-20 min, make its dispersed, add 1.0-2.5 g chitosans, are used again after stirring 50-60 min super
Sonicated 15-20 min, pH value then is adjusted to 5.8 with 1 mol/L NaOH solutions, 20-24 h is stood, chitosan is made
With SiOx compelx coating liquid；
4) dry, pack, storage；After fresh-cut water chestnut dry tack free after above-mentioned processing, gathered with 0.015-0.02 mm are thick
Vinyl film bag modified-atmosphere package, is stored in 0-4 DEG C of freezer.
Embodiment 1
A kind of method for suppressing fresh-cut water chestnut brown stain, comprises the following steps：
1) pre-treatment：Select full, individual big, free from extraneous odour, without rotten, no disease and pests harm, the fresh water chestnut without scabbing, use circulating water
Rinse, go the removal of impurity and part microorganism；
2) acidic electrolytic water immersion is removed the peel simultaneously：Water chestnut after cleaning is immersed in acidic electrolytic water and soaks 20 min, institute
The pH value for stating acidic electrolytic water is 2.5, and available chlorine content is 60 mg/L, while is removed the peel；
Wherein, acidic electrolytic water is prepared using the clean peace HRW2500 acidic oxidized electric potential waters process units of speed；
3) compelx coating liquid is handled：Water chestnut after peeling soaks 1 min, the system of the compelx coating liquid using compelx coating liquid
Preparation Method is as follows：0.08g SiOx nanoparticals are added in the % citric acid solutions of 100 mL 0.75, the min of ultrasonication 15,
Make its dispersed, add 1.75 g chitosans, the min of ultrasonication 15 is used again after stirring 60 min, then with 1 mol/
L NaOH solutions adjust pH value to 5.8, stand 24 h, chitosan and SiOx compelx coating liquid is made；
4) dry, pack, storage；It is thin with the thick polyethylene of 0.015 mm after fresh-cut water chestnut dry tack free after above-mentioned processing
Film bag modified-atmosphere package, is stored in Cool Room 4 DEG C.
Reference examples 1
With the acidic electrolytic water in distilled water alternate embodiment 1 and compelx coating liquid, remaining all steps and parameter are the same as implementation
Example 1
Through embodiment 1 and the method for reference examples 1 processing after fresh-cut water chestnut storage period, respectively determine browning index, L values, relatively
The physical and chemical indexs such as electrical conductivity, soluble solid content, weight-loss ratio, respiratory rate, PPO activity, total phenol content.
Fresh-cut water chestnut browning index is calculated as follows：Browning degree is divided into 6 grades according to surface browned area size.1 grade：It is brown
Variable area is 0；2 grades：Browned area<1/4；3 grades：1/4≤browned area<1/2；4 grades：1/2≤browned area<3/4；5 grades：3/
4≤browned area≤1；6 grades：Whole brown stains.
Browning index calculation formula：Browning index=Σ（Brown stain series × this grade of number）/ sum.
Experimental result as Figure 1-Figure 8, wherein, treatment group be through the method for embodiment 1 processing after experimental result；Control
Group is the experimental result after the processing of the method for reference examples 1.
Experimental result is shown：Fresh-cut water chestnut stores the 25th day, and control group fresh-cut water chestnut browning index is up to 6.0；And handle
Group fresh-cut water chestnut browning index is only 3.2.Acidic electrolytic water immersion, which combines the processing of compelx coating liquid, can effectively reduce fresh-cut water chestnut
Respiratory rate and PPO activity, reduce dehydration, keep higher L values, soluble solid and total phenol content, delay electricity relatively
The rise of conductance.This experimental result illustrates that the inventive method can significantly inhibit the brown stain of fresh-cut water chestnut, keep its edible quality.
Embodiment 2
A kind of method for suppressing fresh-cut water chestnut brown stain, comprises the following steps：
1) pre-treatment：Select full, individual big, free from extraneous odour, without rotten, no disease and pests harm, the fresh water chestnut without scabbing, use circulating water
Rinse, go the removal of impurity and part microorganism；
2) acidic electrolytic water immersion is removed the peel simultaneously：Water chestnut after cleaning is immersed in acidic electrolytic water and soaks 15min, institute
The pH value for stating acidic electrolytic water is 2.0, available chlorine content 50mg/L, while is removed the peel；
Wherein, acidic electrolytic water is prepared using the clean peace HRW2500 acidic oxidized electric potential waters process units of speed；
3) compelx coating liquid is handled：Water chestnut after peeling soaks 1 min, the system of the compelx coating liquid using compelx coating liquid
Preparation Method is as follows：0.03 g SiOx nanoparticals are added in the % citric acid solutions of 100 mL 0.5, the min of ultrasonication 15,
Make its dispersed, add 1.0 g chitosans, the min of ultrasonication 15 is used again after stirring 50 min, then with 1 mol/L
NaOH solution adjusts pH value to 5.8, stands 20 h, chitosan and SiOx compelx coating liquid is made；
4) dry, pack, storage；It is thin with the thick polyethylene of 0.02 mm after fresh-cut water chestnut dry tack free after above-mentioned processing
Film bag modified-atmosphere package, is stored in 0 DEG C of freezer.
Reference examples 2
With the acidic electrolytic water in distilled water alternate embodiment 2 and compelx coating liquid, remaining all steps and parameter are the same as implementation
Example 2.
Fresh-cut water chestnut storage period after embodiment 2 and the processing of the method for reference examples 2, determines the physics and chemistry such as browning index respectively
Index.
Experimental result is shown：Fresh-cut water chestnut stores the 25th day, and control group fresh-cut water chestnut browning index is up to 6.0；And handle
Group fresh-cut water chestnut browning index is only 3.0.
Embodiment 3
A kind of method for suppressing fresh-cut water chestnut brown stain, comprises the following steps：
1) pre-treatment：Select full, individual big, free from extraneous odour, without rotten, no disease and pests harm, the fresh water chestnut without scabbing, use circulating water
Rinse, go the removal of impurity and part microorganism；
2) acidic electrolytic water immersion is removed the peel simultaneously：Water chestnut after cleaning is immersed in acidic electrolytic water and soaks 25 min, institute
The pH value for stating acidic electrolytic water is 3.5, and available chlorine content is 70 mg/L, while is removed the peel；
Wherein, acidic electrolytic water is prepared using the clean peace HRW2500 acidic oxidized electric potential waters process units of speed；
3) compelx coating liquid is handled：Water chestnut after peeling soaks 2 min, the system of the compelx coating liquid using compelx coating liquid
Preparation Method is as follows：0.12 g SiOx nanoparticals are added in the % citric acid solutions of 100 mL 1.0, the min of ultrasonication 20,
Make its dispersed, add 2.5 g chitosans, the min of ultrasonication 20 is used again after stirring 60 min, then with 1 mol/L
NaOH solution adjusts pH value to 5.8, stands 24 h, chitosan and SiOx compelx coating liquid is made；
4) dry, pack, storage；It is thin with the thick polyethylene of 0.02 mm after fresh-cut water chestnut dry tack free after above-mentioned processing
Film bag modified-atmosphere package, is stored in Cool Room 4 DEG C.
Reference examples 3
With the acidic electrolytic water in distilled water alternate embodiment 3 and compelx coating liquid, remaining all steps and parameter are the same as implementation
Example 3.
Fresh-cut water chestnut storage period after embodiment 3 and the processing of the method for reference examples 3, determines the physics and chemistry such as browning index respectively
Index.
Experimental result is shown：Fresh-cut water chestnut stores the 25th day, and control group fresh-cut water chestnut browning index is up to 6.0；And handle
Group fresh-cut water chestnut browning index is only 3.3.
Comparative example 1
Acidic electrolytic water in embodiment 1 is changed to subacidity electrolysis water（For pH value in 5.0-6.5, available chlorine content is 50 mg/
L）, remaining step is the same as embodiment 1.
Experimental result is shown：Fresh-cut water chestnut stores the 25th day, and control group fresh-cut water chestnut browning index is up to 6.0；Treatment group
Fresh-cut water chestnut browning index is 4.5.
Comparative example 2
The individually fresh-cut water chestnut embodiment through acidic electrolysis water process：
1) pre-treatment：Select full, individual big, free from extraneous odour, without rotten, no disease and pests harm, the fresh water chestnut without scabbing, use circulating water
Rinse, go the removal of impurity and part microorganism；
2) acidic electrolytic water immersion is removed the peel simultaneously：Water chestnut after cleaning is immersed in acidic electrolytic water and soaks 20 min, institute
The pH value for stating acidic electrolytic water is 2.5, and available chlorine content is 60 mg/L, while is removed the peel；
Wherein, acidic electrolytic water is prepared using the clean peace HRW2500 acidic oxidized electric potential waters process units of speed；
3) dry, pack, storage；It is thin with the thick polyethylene of 0.015 mm after fresh-cut water chestnut dry tack free after above-mentioned processing
Film bag modified-atmosphere package, is stored in Cool Room 4 DEG C.
Experimental result is shown：Fresh-cut water chestnut stores the 25th day, control group（Individually through acidic electrolysis water process）Fresh-cut water chestnut
Browning index is up to 4.8；Treatment group（The processing of acidic electrolytic water combination compelx coating liquid）Fresh-cut water chestnut browning index is 3.2.
Comparative example 3
The fresh-cut water chestnut embodiment individually handled through compelx coating liquid：
1) pre-treatment：Select full, individual big, free from extraneous odour, without rotten, no disease and pests harm, the fresh water chestnut without scabbing, use circulating water
Rinse, go the removal of impurity and part microorganism, while removed the peel；
2) compelx coating liquid is handled：Water chestnut after peeling handles 1 min, the system of the compelx coating liquid using compelx coating liquid
Preparation Method is as follows：0.08g SiOx nanoparticals are added in the % citric acid solutions of 100 mL 0.75, the min of ultrasonication 15,
Make its dispersed, add 1.75 g chitosans, the min of ultrasonication 15 is used again after stirring 60 min, then with 1 mol/
L NaOH solutions adjust pH value to 5.8, stand 24 h, chitosan and SiOx compelx coating liquid is made；
3) dry, pack, storage；It is thin with the thick polyethylene of 0.015 mm after fresh-cut water chestnut dry tack free after above-mentioned processing
Film bag modified-atmosphere package, is stored in Cool Room 4 DEG C.
Experimental result is shown：Fresh-cut water chestnut stores the 25th day, control group（Individually handled through compelx coating liquid）Fresh-cut water chestnut
Browning index is up to 4.6；Treatment group（The processing of acidic electrolytic water combination compelx coating liquid）Fresh-cut water chestnut browning index is 3.2.
The foregoing is only presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, it should all belong to the covering scope of the present invention.
Claims (8)
- A kind of 1. method for suppressing fresh-cut water chestnut brown stain, it is characterised in that：It comprises the following steps：1) pre-treatment：Select fresh water chestnut and cleaned with water；2) acidic electrolytic water immersion is removed the peel simultaneously：Water chestnut after cleaning is immersed in acidic electrolytic water and soaks 15-25 Min, the pH value of the acidic electrolytic water is 2.0-3.5, and available chlorine content is 50-70 mg/L, while is removed the peel；3) compelx coating liquid is handled：Water chestnut after peeling is using compelx coating liquid immersion 1-2min, the system of the compelx coating liquid Preparation Method is as follows：SiOx nanoparticals are added in citric acid solution, ultrasonication 15-20 min, add chitosan, are stirred Ultrasonication 15-20 min are used after 50-60 min again, then pH value is adjusted to 5.8 with alkali lye, stands 20-24 h, shell is made The compelx coating liquid of glycan and SiOx；Wherein, SiOx, citric acid solution, the amount ratio of chitosan are the g of 0.03-0.12 g: 100 mL: 1.0-2.5；4) dry, pack, storage；After fresh-cut water chestnut dry tack free after above-mentioned processing, pack, storage.
- A kind of 2. method for suppressing fresh-cut water chestnut brown stain according to claim 1, it is characterised in that：Step 1）The water chestnut of selection Shepherd's purse is rinsed for full, individual big, free from extraneous odour, without rotten, no disease and pests harm, the fresh water chestnut without scabbing, the water chestnut with circulating water.
- A kind of 3. method for suppressing fresh-cut water chestnut brown stain according to claim 1, it is characterised in that：Step 2）Described acid Property electrolysis water be to be prepared using the clean peace HRW2500 acidic oxidized electric potential water process units of speed.
- A kind of 4. method for suppressing fresh-cut water chestnut brown stain according to claim 1, it is characterised in that：Step 3）Described lemon The concentration of lemon acid solution is 0.5-1.0 %.
- A kind of 5. method for suppressing fresh-cut water chestnut brown stain according to claim 1, it is characterised in that：Step 3）Described Alkali lye is 1 mol/L NaOH solutions.
- A kind of 6. method for suppressing fresh-cut water chestnut brown stain according to claim 1, it is characterised in that：Step 4）Described bag Fill as using polythene film bag modified-atmosphere package.
- A kind of 7. method for suppressing fresh-cut water chestnut brown stain according to claim 6, it is characterised in that：The polyethylene is thin The thickness of film bag is 0.015-0.02 mm.
- 8. the method according to claim 1 for suppressing fresh-cut water chestnut brown stain, it is characterised in that：Step 4）Described storage Condition is in 0-4 DEG C of refrigeration.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113647451A (en) * | 2021-08-20 | 2021-11-16 | 武汉轻工大学 | Processing method for prolonging shelf life of water chestnuts |
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| CN102940032A (en) * | 2012-11-01 | 2013-02-27 | 江苏省农业科学院 | Composite biological coating agent and method for using the same in fresh keeping of blueberry |
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Application publication date: 20180119 |