A kind of crude antistaling agent for strawberry preservation and preparation method thereof and preservation method
Technical field
The invention belongs to preserving fruit and vegetable utilizing field, and in particular to a kind of crude antistaling agent and its preparation side for strawberry preservation
Method and preservation method.
Background technology
Strawberry is perennial herb, is rose family pseudocarp reality, and the lovely luster of strawberry, fragrance is tempting, possesses the mouth of uniqueness
Sense, it is also very high containing abundant nutriment, edible value.In addition, strawberry also has medical value, such as heat-clearing and fire-reducing, anticancer
Disease and anti-aging.The water content of strawberry is very high, but without hard outer tissue, thus strawberry be very easy in transportational process by
To mechanical damage, the ethylene contents that strawberry discharges after adopting rise violently rapidly, and its own microorganism carried also allows its preservation
Phase is very short, causes to rot and lose commodity value, can only preserve 1~2d at normal temperatures.There is substantial amounts of strawberry also not every year
Sell away and just rot, cause serious economic loss and the wasting of resources, therefore, finding suitable strawberry preservation technology is
The task of top priority.
At present, for Storage of Strawberry based on deepfreeze, this method can reduce strawberry softening rate to a certain extent, but
It is that fruit dehydration is very fast, air conditioned storage, reduced pressure treatment, radiation treatment can extend the shelf life of strawberry, but cost is higher.
Fresh-keeping using chemical substance, its residual has hidden danger to health.In recent years, crude antistaling agent was got over for the research of strawberry preservation
Come more.Crude antistaling agent mainly includes stomata of the Antibacterial Constituents with sterilization and anticorrosion with blocking moisture loss, reduces
Water loss, can prevent gas exchanges inside and outside fruit, suppress respiration, and can prevent the film infected of microorganism into
Point.But many crude antistaling agents extract from natural drug, such as allicin (application number 201410572415.6, Yi Zhongcao more
Certain kind of berries fresh-keeping liquid and preparation method thereof), Chinese gall (application number 201510180807.2, a kind of Chinese herb residues leaching liquor-gelatin strawberry
The preparation method of preservative film), radix glycyrrhizae, cordate houttuynia (application number 201510533552.3, a kind of composite preservative of strawberry) etc., this
Although a little natural components have preferable sterilization and anticorrosion activity, can have strawberry and make us not pleasant peculiar smell, so that shadow
Ring the sale of strawberry.Therefore, for current strawberry preservation technology there are the drawbacks of, develop a kind of compound guarantor of green safe strawberry
Fresh dose is necessary.
The content of the invention
Goal of the invention:For problem present on current strawberry preservation technology, the present invention provides one kind and is used for strawberry preservation
Crude antistaling agent, which prepares the crude antistaling agent for strawberry using pomelo peel and apple skin as raw material, can be to grass
The certain kind of berries carries out effectively fresh-keeping.
The present invention also provides the preparation method and preservation method of the crude antistaling agent for strawberry preservation.
Technical solution:To achieve these goals, a kind of crude antistaling agent for strawberry preservation as described herein, institute
State crude antistaling agent to be made of pomelo peel extracting solution and apple skin extracting solution, wherein pomelo peel extracting solution institute in crude antistaling agent
The volume fraction accounted for is 40%-55%v/v, and apple skin extracting solution volume fraction shared in antistaling agent is 45%-60%v/
v。
The preparation method of crude antistaling agent of the present invention, comprises the following steps:
(1) pomelo peel is cleaned, dried, pulverized and sieved, obtain pomelo peel coarse powder;Pomelo peel coarse powder is placed in ethanol water
In, refluxing extraction, extracting solution filtering, obtains filtrate and filter residue;Decompression filtrate recycling ethanol is simultaneously concentrated into pomelo peel general flavone content
It is pomelo peel extracting solution A in 30-35mg/mL;
Filter residue is placed in deionized water, with salt acid for adjusting pH, refluxing extraction, filtrate is filtered, and filter residue discards, and filtrate subtracts
Pressure is concentrated into pomelo peel pectin content in 10-15mg/mL, is pomelo peel extracting solution B;Pomelo peel extracting solution A and B are mixed in equal volume
Close, obtain pomelo peel extracting solution;
(2) apple skin is cleaned, dried, pulverized and sieved, obtain apple skin coarse powder;Ethanol water is placed in by apple skin coarse powder
In, refluxing extraction, extracting solution filtering, obtains filtrate and filter residue;Decompression filtrate recycling ethanol is simultaneously concentrated into Determination of Polyphenols in 20-
25mg/mL, is apple skin extracting solution A;
Filter residue is placed in deionized water, with salt acid for adjusting pH, refluxing extraction, filtrate is filtered, and filter residue discards, and filtrate subtracts
Pressure is concentrated into apple skin pectin content in 10-15mg/mL, is apple skin extracting solution B;Apple skin extracting solution A and B are mixed in equal volume
Close, obtain apple skin extracting solution;
(3) the apple skin extracting solution that the pomelo peel extracting solution and step (2) obtained step (1) obtains mixes in proportion
To the crude antistaling agent for strawberry preservation.
Wherein, step (1) the pomelo peel coarse powder is 1 by mass volume ratio:It is 70- that 8-12mg/mL, which adds volume fraction,
Refluxing extraction in 80% ethanol water.It is preferred that pomelo peel coarse powder is 1 by mass volume ratio:10mg/mL adds volume fraction
For in the ethanol water of 75%v/v.
Wherein, the step (1) filter residue is 1 by mass volume ratio:6-10mg/mL is added in deionized water.It is preferred that
Filter residue is 1 by mass volume ratio:8mg/mL adds refluxing extraction in deionized water.
Wherein, step (2) the apple skin coarse powder is 1 by mass volume ratio:It is 80- that 8-12mg/mL, which adds volume fraction,
Refluxing extraction in 90% ethanol water.Preferably apple skin coarse powder is 1 by mass volume ratio:10mg/mL adds volume fraction
For in the ethanol water of 90%v/v.
Wherein, the step (2) filter residue is 1 by mass volume ratio:6-10mg/mL is added in deionized water.It is preferred that
Filter residue is 1 by mass volume ratio:8mg/mL adds refluxing extraction in deionized water.
Wherein, step (1) and step (2) described refluxing extraction are 2-3 times, each 1-1.5h.Preferably, refluxing extraction 2
Secondary, each 1.5h, extracting solution merges filtering.
Wherein, step (1) and step (2) the salt acid for adjusting pH are 2-3.Preferably, with the salt acid for adjusting pH of 1mol/L
For 2.
Crude antistaling agent of the present invention is used for the preservation method of strawberry preservation, includes the following steps:
1) eight to ninety percent ripe strawberries are harvested, no disease and pests harm is selected, has no mechanical damage, uniform fresh strawberry;
2) strawberry is placed in crude antistaling agent and soaks 20min, taken out strawberry, dry;The strawberry dried is deposited in cold
Storehouse is fresh-keeping.
Wherein, the temperature of step (2) described freezer be 2-10 DEG C, relative humidity 85-90%.
Beneficial effect:Compared with prior art, the present invention has following conspicuousness beneficial effect:
1st, in crude antistaling agent of the invention pomelo peel, apple skin ethanol extract be mainly flavones and Polyphenols activity into
Point, and containing certain ursolic acid, these compounds not only have higher antibacterial and antioxidation activity in vitro, are taken the photograph by human body
Enter, also have and remove free radical and reducing blood lipid isoreactivity.
2nd, pomelo peel, apple skin ethanol extract can extract partial pericarp fruit wax, and water extract is mainly pectin, fruit wax
Layer protecting film can be formed in strawberry surface with pectin, and fruit wax has certain waterproof action, can preferably prevent strawberry water
The loss divided.
3rd, pomelo peel and apple bark extract all have delicate fragrance fruity in crude antistaling agent, even if remaining on strawberry,
Consumer will not be allowed to produce the not pleasant sense of taste.
4th, preparation method of the invention is simple and convenient, and pomelo peel and apple skin are industrial processes discarded object, with pomelo peel
It is raw material with apple skin, prepares the crude antistaling agent for strawberry, not only turn waste into wealth, but also also reduce discarded object to environment
Pollution, kill two birds with one stone.
5th, at the same time using pomelo peel and the extracting solution of apple skin in crude antistaling agent of the invention, synergistic, fresh-keeping effect
Fruit is good;Preservation method using the present invention can cause healthy fruit of the strawberry when fresh keeping time is 20 days to be more than 90%, dehydration
Rate is less than 2%.
Embodiment
The present invention will be further described with reference to embodiments.
Embodiment 1
(1) pomelo peel cleaning, drying, crushed 60 mesh sieves, obtain pomelo peel coarse powder.By mass volume ratio 1:10g/mL is by shaddock
Sub- skin coarse powder is placed in the ethanol water of 75%v/v concentration, refluxing extraction 2 times, each 1.5h, and extracting solution merges, and filtering, obtains
Filtrate and filter residue.Decompression filtrate recycling ethanol is simultaneously concentrated into pomelo peel general flavone content in 30mg/mL, is pomelo peel extracting solution A.
It is 1 by mass volume ratio:Filter residue is placed in deionized water by 8g/mL, and pH2 is adjusted with the hydrochloric acid of 1mol/L, refluxing extraction 2 times,
Each 1.5h, merging filtrate, filtering, filter residue discards, and filtrate decompression is concentrated into pomelo peel pectin content in 10mg/mL, is shaddock
Skin extracting solution B.By pomelo peel extracting solution A and B by volume 1:1 mixing, obtains pomelo peel extracting solution.
(2) apple skin cleaning, drying, crushed 80 mesh sieves, obtain apple skin coarse powder.By mass volume ratio 1:10g/mL is by apple
Pericarp coarse powder is placed in the ethanol water of 90%v/v concentration, refluxing extraction 2 times, each 1.5h, and extracting solution merges, and filtering, obtains
Filtrate and filter residue.Decompression filtrate recycling ethanol is simultaneously concentrated into Determination of Polyphenols in 25mg/mL, is apple skin extracting solution A.By quality
Volume ratio 1:Filter residue is placed in deionized water by 8g/mL, and pH2 is adjusted with the hydrochloric acid of 1mol/L, refluxing extraction 2 times, each 1.5h,
Merging filtrate, filtering, filter residue discards, and filtrate decompression is concentrated into apple skin pectin content in 15mg/mL, is apple skin extracting solution B.
By apple skin extracting solution A and B by volume 1:1 mixing, obtains apple skin extracting solution.
(3) it is 40% by pomelo peel extracting solution volume fraction v/v shared in crude antistaling agent, apple skin extracting solution exists
Shared volume fraction v/v is 60% in antistaling agent, is mixed to get crude antistaling agent.
(4) eight to ninety percent ripe strawberries are harvested, no disease and pests harm is selected, has no mechanical damage, uniform fresh strawberry.By grass
The certain kind of berries, which is placed in crude antistaling agent, soaks 20min, takes out strawberry, dries.The strawberry dried is deposited in into 2-10 DEG C of environment temperature, phase
It is fresh-keeping to the freezer that humidity is 85-90%.
Embodiment 2
(1) pomelo peel cleaning, drying, crushed 60 mesh sieves, obtain pomelo peel coarse powder.By mass volume ratio 1:10g/mL is by shaddock
Sub- skin coarse powder is placed in the ethanol water of 75%v/v concentration, refluxing extraction 2 times, each 1.5h, and extracting solution merges, and filtering, obtains
Filtrate and filter residue.Decompression filtrate recycling ethanol is simultaneously concentrated into pomelo peel general flavone content in 35mg/mL, is pomelo peel extracting solution A.
By mass volume ratio 1:Filter residue is placed in deionized water by 8g/mL, and pH2 is adjusted with the hydrochloric acid of 1mol/L, refluxing extraction 2 times, often
Secondary 1.5h, merging filtrate, filtering, filter residue discards, and filtrate decompression is concentrated into pomelo peel pectin content in 15mg/mL, is pomelo peel
Extracting solution B.By pomelo peel extracting solution A and B by volume 1:1 mixing, obtains pomelo peel extracting solution.
(2) apple skin cleaning, drying, crushed 80 mesh sieves, obtain apple skin coarse powder.By mass volume ratio 1:10g/mL is by apple
Pericarp coarse powder is placed in the ethanol water of 90%v/v concentration, refluxing extraction 2 times, each 1.5h, and extracting solution merges, and filtering, obtains
Filtrate and filter residue.Decompression filtrate recycling ethanol is simultaneously concentrated into Determination of Polyphenols in 20mg/mL, is apple skin extracting solution A.By quality
Volume ratio 1:Filter residue is placed in deionized water by 8g/mL, and pH2 is adjusted with the hydrochloric acid of 1mol/L, refluxing extraction 2 times, each 1.5h,
Merging filtrate, filtering, filter residue discards, and filtrate decompression is concentrated into apple skin pectin content in 10mg/mL, is apple skin extracting solution B.
By apple skin extracting solution A and B by volume 1:1 mixing, obtains apple skin extracting solution.
(3) it is 55% by pomelo peel extracting solution volume fraction v/v shared in crude antistaling agent, apple skin extracting solution exists
Shared volume fraction v/v is 45% in antistaling agent, is mixed to get crude antistaling agent.
(4) eight to ninety percent ripe strawberries are harvested, no disease and pests harm is selected, has no mechanical damage, uniform fresh strawberry.By grass
The certain kind of berries, which is placed in crude antistaling agent, soaks 20min, takes out strawberry, dries.The strawberry dried is deposited in into 2-10 DEG C of environment temperature, phase
It is fresh-keeping to the freezer that humidity is 85-90%.
Embodiment 3
(1) pomelo peel cleaning, drying, crushed 60 mesh sieves, obtain pomelo peel coarse powder.By mass volume ratio 1:10g/mL is by shaddock
Sub- skin coarse powder is placed in the ethanol water of 75%v/v concentration, refluxing extraction 2 times, each 1.5h, and extracting solution merges, and filtering, obtains
Filtrate and filter residue.Decompression filtrate recycling ethanol is simultaneously concentrated into pomelo peel general flavone content in 33mg/mL, is pomelo peel extracting solution A.
By mass volume ratio 1:Filter residue is placed in deionized water by 8g/mL, and pH2 is adjusted with the hydrochloric acid of 1mol/L, refluxing extraction 2 times, often
Secondary 1.5h, merging filtrate, filtering, filter residue discards, and filtrate decompression is concentrated into pomelo peel pectin content in 13mg/mL, is pomelo peel
Extracting solution B.By pomelo peel extracting solution A and B by volume 1:1 mixing, obtains pomelo peel extracting solution.
(2) apple skin cleaning, drying, crushed 80 mesh sieves, obtain apple skin coarse powder.By mass volume ratio 1:10g/mL is by apple
Pericarp coarse powder is placed in the ethanol water of 90%v/v concentration, refluxing extraction 2 times, each 1.5h, and extracting solution merges, and filtering, obtains
Filtrate and filter residue.Decompression filtrate recycling ethanol is simultaneously concentrated into Determination of Polyphenols in 22mg/mL, is apple skin extracting solution A.By quality
Volume ratio 1:Filter residue is placed in deionized water by 8g/mL, and pH2 is adjusted with the hydrochloric acid of 1mol/L, refluxing extraction 2 times, each 1.5h,
Merging filtrate, filtering, filter residue discards, and filtrate decompression is concentrated into apple skin pectin content in 12mg/mL, is apple skin extracting solution B.
By apple skin extracting solution A and B by volume 1:1 mixing, obtains apple skin extracting solution.
(3) it is 50% by pomelo peel extracting solution volume fraction v/v shared in crude antistaling agent, apple skin extracting solution exists
Shared volume fraction v/v is 50% in antistaling agent, is mixed to get crude antistaling agent.
(4) eight to ninety percent ripe strawberries are harvested, no disease and pests harm is selected, has no mechanical damage, uniform fresh strawberry.By grass
The certain kind of berries, which is placed in crude antistaling agent, soaks 20min, takes out strawberry, dries.The strawberry dried is deposited in into 2-10 DEG C of environment temperature, phase
It is fresh-keeping to the freezer that humidity is 85-90%.
Embodiment 4
(1) pomelo peel cleaning, drying, crushed 60 mesh sieves, obtain pomelo peel coarse powder.By mass volume ratio 1:8g/mL is by shaddock
Sub- skin coarse powder is placed in the ethanol water of 70%v/v concentration, refluxing extraction 3 times, each 1h, and extracting solution merges, and filtering, must filter
Liquid and filter residue.Decompression filtrate recycling ethanol is simultaneously concentrated into pomelo peel general flavone content in 32mg/mL, is pomelo peel extracting solution A.Press
Mass volume ratio 1:Filter residue is placed in deionized water by 6g/mL, and pH3 is adjusted with the hydrochloric acid of 1mol/L, refluxing extraction 2 times, every time
1.5h, merging filtrate, filtering, filter residue discards, and filtrate decompression is concentrated into pomelo peel pectin content in 12mg/mL, is carried for pomelo peel
Take liquid B.By pomelo peel extracting solution A and B by volume 1:1 mixing, obtains pomelo peel extracting solution.
(2) apple skin cleaning, drying, crushed 80 mesh sieves, obtain apple skin coarse powder.By mass volume ratio 1:12g/mL is by apple
Pericarp coarse powder is placed in the ethanol water of 80%v/v concentration, refluxing extraction 2 times, each 1.5h, and extracting solution merges, and filtering, obtains
Filtrate and filter residue.Decompression filtrate recycling ethanol is simultaneously concentrated into Determination of Polyphenols in 23mg/mL, is apple skin extracting solution A.By quality
Volume ratio 1:Filter residue is placed in deionized water by 10g/mL, and pH3 is adjusted with the hydrochloric acid of 1mol/L, refluxing extraction 2 times, every time
1.5h, merging filtrate, filtering, filter residue discards, and filtrate decompression is concentrated into apple skin pectin content in 13mg/mL, is carried for apple skin
Take liquid B.By apple skin extracting solution A and B by volume 1:1 mixing, obtains apple skin extracting solution.
(3) it is 48% by pomelo peel extracting solution volume fraction v/v shared in crude antistaling agent, apple skin extracting solution exists
Shared volume fraction v/v is 52% in antistaling agent, is mixed to get crude antistaling agent.
(4) eight to ninety percent ripe strawberries are harvested, no disease and pests harm is selected, has no mechanical damage, uniform fresh strawberry.By grass
The certain kind of berries, which is placed in crude antistaling agent, soaks 20min, takes out strawberry, dries.The strawberry dried is deposited in into 2-10 DEG C of environment temperature, phase
It is fresh-keeping to the freezer that humidity is 85-90%.
Embodiment 5
(1) pomelo peel cleaning, drying, crushed 60 mesh sieves, obtain pomelo peel coarse powder.By mass volume ratio 1:12g/mL is by shaddock
Sub- skin coarse powder is placed in the ethanol water of 80%v/v concentration, refluxing extraction 2 times, each 1.5h, and extracting solution merges, and filtering, obtains
Filtrate and filter residue.Decompression filtrate recycling ethanol is simultaneously concentrated into pomelo peel general flavone content in 32mg/mL, is pomelo peel extracting solution A.
By mass volume ratio 1:Filter residue is placed in deionized water by 10g/mL, and pH2 is adjusted with the hydrochloric acid of 1mol/L, refluxing extraction 2 times, often
Secondary 1.5h, merging filtrate, filtering, filter residue discards, and filtrate decompression is concentrated into pomelo peel pectin content in 12mg/mL, is pomelo peel
Extracting solution B.By pomelo peel extracting solution A and B by volume 1:1 mixing, obtains pomelo peel extracting solution.
(2) apple skin cleaning, drying, crushed 80 mesh sieves, obtain apple skin coarse powder.By mass volume ratio 1:8g/mL is by apple
Pericarp coarse powder is placed in the ethanol water of 80%v/v concentration, refluxing extraction 3 times, each 1h, and extracting solution merges, and filtering, must filter
Liquid and filter residue.Decompression filtrate recycling ethanol is simultaneously concentrated into Determination of Polyphenols in 22mg/mL, is apple skin extracting solution A.By mass body
Product ratio 1:Filter residue is placed in deionized water by 6g/mL, adjusts pH3 with the hydrochloric acid of 1mol/L, refluxing extraction 2 times, each 1.5h, is closed
And filtrate, filtering, filter residue discards, and filtrate decompression is concentrated into apple skin pectin content in 12mg/mL, is apple skin extracting solution B.Will
Apple skin extracting solution A and B by volume 1:1 mixing, obtains apple skin extracting solution.
(3) it is 47% by pomelo peel extracting solution volume fraction v/v shared in crude antistaling agent, apple skin extracting solution exists
Shared volume fraction v/v is 53% in antistaling agent, is mixed to get crude antistaling agent.
(4) eight to ninety percent ripe strawberries are harvested, no disease and pests harm is selected, has no mechanical damage, uniform fresh strawberry.By grass
The certain kind of berries, which is placed in crude antistaling agent, soaks 20min, takes out strawberry, dries.The strawberry dried is deposited in into 2-10 DEG C of environment temperature, phase
It is fresh-keeping to the freezer that humidity is 85-90%.
Test example
The crude antistaling agent prepared using 1-3 of the embodiment of the present invention handles strawberry, investigate shelf-life of strawberry, healthy fruit and
Percentage of water loss (20 days) and whether there is peculiar smell, the results are shown in Table 1.
Wherein comparative example 1, under 1 step of embodiment (4) equal conditions, crude antistaling agent processing grass is prepared without the present invention
The certain kind of berries;
Comparative example 2 is under equal conditions, using a kind of composite preservative of strawberry of the prior art
(201510533552.3) step (4) in embodiment 1 is pressed to handle;
Comparative example 3 is the pure pomelo peel extracting solution prepared using the embodiment of the present invention 1, and by step (4) place in embodiment 1
Reason;
Comparative example 4 is the pure apple skin extracting solution prepared using the embodiment of the present invention 1, and by step (4) in embodiment 1
Processing.
Table 1
|
Shelf-life (my god) |
Healthy fruit (%) |
Peculiar smell |
Percentage of water loss (%) |
Embodiment 1 |
21 |
More than 90% |
Nothing |
Less than 2% |
Embodiment 2 |
22 |
More than 90% |
Nothing |
Less than 2% |
Embodiment 3 |
22 |
More than 90% |
Nothing |
Less than 2% |
Comparative example 1 |
7 |
0 |
Nothing |
———— |
Comparative example 2 |
20 |
Less than 80% (20 days) |
Have |
More than 10% (20 days) |
Comparative example 3 |
14 |
Less than 75% (14 days) |
Nothing |
More than 10% (14 days) |
Comparative example 4 |
15 |
Less than 75% (15 days) |
Nothing |
More than 10% (15 days) |
As seen from the results in Table 1,1-3 of the embodiment of the present invention prepare crude antistaling agent processing strawberry after, 2-10 DEG C of temperature,
Relative humidity can reach more than 21 days for the 85-90% shelf-lifves, wherein healthy fruit at 20 days can reach more than 90%, and
And percentage of water loss is less than 2%, completely without peculiar smell.Unprocessed strawberry compared to comparative example 1 extends 14-15 days;And contrast
Although the shelf-life, also the present invention was close after the antistaling agent processing of example 2, not as of the invention, percentage of water loss adds the healthy fruit of 20 days
Height, and due to containing the exhausted cordate houttuynia of radix glycyrrhizae in antistaling agent so that strawberry has obvious peculiar smell;Comparative example 3 and 4 uses single
Pomelo peel extracting solution or single apple skin extracting solution, indices are substantially not as the crude antistaling agent of the present invention;Illustrate this
Invention is synergistic at the same time using pomelo peel and the extracting solution of apple skin, of good preservation effect.