CN104309933A - Storage and preservation method of fresh walnuts - Google Patents
Storage and preservation method of fresh walnuts Download PDFInfo
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- CN104309933A CN104309933A CN201410432843.9A CN201410432843A CN104309933A CN 104309933 A CN104309933 A CN 104309933A CN 201410432843 A CN201410432843 A CN 201410432843A CN 104309933 A CN104309933 A CN 104309933A
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Abstract
The invention discloses a storage and preservation method of fresh walnuts. The storage and preservation method comprises the following steps: taking the fresh walnuts from which green peels are removed, putting the fresh walnuts into a packaging bag, vacuumizing till the air pressure is -0.08MPa to -0.06MPa, inflating nitrogen till the gas pressure at an outlet of the packaging bag is 0.5MPa, sealing an opening, and storing at a temperature of 0 DEG C. The storage and preservation method is easy and convenient to operate; by the storage and preservation method, the illness rate of the stored fresh walnuts can be effectively reduced, a relatively high water content can be kept and a commodity property of the fresh walnuts can be maintained; the storage and preservation method has a wide application value and a bright application prospect.
Description
Technical field
The present invention relates to a kind of method for storing and refreshing of fresh-eating walnut.
Background technology
Walnut (Juglans Legia L.) calls English walnut, Qiang peach, is walnut section (Jugladaceac) Juglans (Juglans) plant.Walnut nutritious value is very high, containing abundant amino acid, unsaturated fatty acid, vitamin and mineral matter.Unsaturated fatty acid in walnut kernel can lower the content of cholesterol and triglyceride, improves the activity of brain cell.Polyphenols in walnut can suppress the oxidation of blood plasma and low-density lipoprotein.
Walnut is as a kind of dry fruit for a long time, is subject to the welcome of customer.Since the nineties in 20th century, the fresh-eating walnut of not drying process worldwide comes into vogue.Compared with xerophagia walnut, fresh-eating walnut has unique local flavor and mouthfeel, and nutrient component damages is few.But because aqueous ingredients is high, fresh-eating walnut is easily subject to infecting of germ in storage, this restrict the development of fresh-eating walnut industry.
Summary of the invention
The object of this invention is to provide a kind of method for storing and refreshing of fresh-eating walnut.
The invention provides a kind of method of preserving fresh-eating walnut, comprise the steps: to remove the fresh-eating walnut after except rascal, be placed in packaging bag, first be evacuated to air pressure for-0.08MPa to-0.06MPa, then the air pressure that inflated with nitrogen to packaging bag exports is 0.5MPa, sealing, 0 DEG C of storage.
Described packaging bag specifically can be vacuum packaging bag.
In described method, every 500g ± 50g walnut can be placed in the vacuum packaging bag of a 25cm × 37cm.
In described method, the time of described storage specifically can be 8 weeks.
Fresh-eating walnut after described removal rascal specifically can be the walnut of second day after removing rascal.
Method provided by the invention operation is simple and easy, convenient, effectively can lower Acid Value of Oil In Walnut During Storage after attack rate, keep higher aqueous ingredients, the commodity of maintenance fresh-eating walnut fruit.The present invention has value and the prospect of wide application.
Detailed description of the invention
Following embodiment is convenient to understand the present invention better, but does not limit the present invention.Experimental technique in following embodiment, if no special instructions, is conventional approach.Test material used in following embodiment, if no special instructions, is and purchases available from routine biochemistry reagent shop.Substitute product in following examples, all arranges and repeats experiment for three times, results averaged.Fresh-eating walnut in the present embodiment is collected in the good pecan orchards of Beijing's Miyun County level of management, and specification is homogeneous, and surface, without disease and pest, has no mechanical damage, after acquisition second day, adopts Mechanical Method to remove the rascal on surface.In embodiment, adopt TDZD-500 type vacuum nitrogen filling packing machine (Beijing Tianlian Scientific and Technological General Co.'s production) to carry out vacuumizing and inflated with nitrogen, nitrogen gas purity is 98.5-99.5%.Electrothermal blowing dry box: Shanghai Yiheng Scientific Instruments Co., Ltd.Vacuum packaging bag: Cangzhou Zhong Xinsu industry Co., Ltd produces (thick 0.16mm).Freshness protection package: national agricultural products fresh-keeping engineering center (Tianjin) provides (thickness 0.02mm).
Embodiment,
Remove second day after rascal, walnut be divided into three groups at random, often organize 600, be handled as follows respectively:
First group: get walnut, every about 500g walnut is placed in the vacuum packaging bag of a 25cm × 37cm, and being first evacuated to air pressure is-0.08MPa, and the air pressure that then inflated with nitrogen to packaging bag exports is 0.5Mpa, sealing, 0 DEG C of storage;
Second group: get walnut, every about 500g walnut is placed in the vacuum packaging bag of a 25cm × 37cm, and being first evacuated to air pressure is-0.06MPa, and the air pressure that then inflated with nitrogen to packaging bag exports is 0.5Mpa, sealing, 0 DEG C of storage;
3rd group: get walnut, every 15 walnuts are placed in a unsealed plastic casing (200mm × 130mm × 50mm), and plastic casing is put into freshness protection package, sealing, 0 DEG C of storage.
After preserving 8 weeks, whether there is the morbidity of mycelia statistics according to duricrust surface.The walnut of the 3rd group is all fallen ill (attack rate 100%), shell all can be observed hypha,hyphae in various degree.The attack rate of first group of walnut is the attack rate of 5%, second group of walnut is 5%.
After preserving 8 weeks, often organize and get 30 walnuts at random, each walnut process is as follows: obtain kernel after clipping broken broken shell with hand-held fruit, kernel is cut into pieces and is put in (kernel weight is now W1) in round aluminium box, dry to constant weight (kernel weight is now W2) in the electrothermal blowing dry box of 110 DEG C, kernel aqueous ingredients=(W1-W2)/W1 × 100%.The result often organized is the aviation value of this group 30 walnuts.The aqueous ingredients of the aqueous ingredients of first group of walnut to be the aqueous ingredients of 28%, second group of walnut be the 28%, three group of walnut is 26%.
Claims (1)
1. preserve a method for fresh-eating walnut, comprise the steps: to remove the fresh-eating walnut after except rascal, be placed in packaging bag, first be evacuated to air pressure for-0.08MPa to-0.06MPa, then the air pressure that inflated with nitrogen to packaging bag exports is 0.5MPa, sealing, 0 DEG C of storage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410432843.9A CN104309933B (en) | 2014-08-28 | 2014-08-28 | A kind of method for storing and refreshing of fresh-eating walnut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410432843.9A CN104309933B (en) | 2014-08-28 | 2014-08-28 | A kind of method for storing and refreshing of fresh-eating walnut |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104309933A true CN104309933A (en) | 2015-01-28 |
| CN104309933B CN104309933B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410432843.9A Active CN104309933B (en) | 2014-08-28 | 2014-08-28 | A kind of method for storing and refreshing of fresh-eating walnut |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102894080A (en) * | 2011-07-29 | 2013-01-30 | 甘肃陇新综合商贸有限公司 | Walnut kernel fresh-keeping method |
| CN103349068A (en) * | 2013-07-19 | 2013-10-16 | 山西昌圆农副土特产品有限公司 | Method for fresh-keeping of wet walnuts in all seasons |
| CN103349312A (en) * | 2013-07-12 | 2013-10-16 | 四川茂华食品有限公司 | Process for storing and processing walnuts |
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2014
- 2014-08-28 CN CN201410432843.9A patent/CN104309933B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102894080A (en) * | 2011-07-29 | 2013-01-30 | 甘肃陇新综合商贸有限公司 | Walnut kernel fresh-keeping method |
| CN103349312A (en) * | 2013-07-12 | 2013-10-16 | 四川茂华食品有限公司 | Process for storing and processing walnuts |
| CN103349068A (en) * | 2013-07-19 | 2013-10-16 | 山西昌圆农副土特产品有限公司 | Method for fresh-keeping of wet walnuts in all seasons |
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| Publication number | Publication date |
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| CN104309933B (en) | 2016-08-24 |
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