CN101617722A - Process for comprehensively assuring quality of walnut oil - Google Patents
Process for comprehensively assuring quality of walnut oil Download PDFInfo
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- CN101617722A CN101617722A CN200810016996A CN200810016996A CN101617722A CN 101617722 A CN101617722 A CN 101617722A CN 200810016996 A CN200810016996 A CN 200810016996A CN 200810016996 A CN200810016996 A CN 200810016996A CN 101617722 A CN101617722 A CN 101617722A
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Abstract
The invention discloses a process for comprehensively assuring the quality of walnut oil and belongs to the technical field of edible oil. The process is characterized by comprising the following steps: 1) filling finished walnut oil, wherein the oil temperature is controlled to be between 55 and 60 DEG C; 2) vacuumizing, wherein the vacuum degree is more than 0.8MPa; and 3) charging an inert gas or nitrogen, wherein the gas pressure is 0.5 to 1.0MPa. The method prolongs the quality guarantee period of the walnut oil, avoiding the use of an additional antioxidant and reduces cost. And the charged inert gas does not react with the walnut oil, so the walnut oil can still retain an excellent natural flavor after long-time storage.
Description
Technical field
The invention belongs to the edible oil technical field, be specifically related to a kind of technology of comprehensively assuring quality of walnut oil.
Background technology
Walnut another name English walnut, Qiang peach, the Juglandaceae walnut is one of important economic tree of China, at present, China's walnut cultivated area occupies first place in the world, and produces about 300,000 tons of walnuts per year, and is annual to external a large amount of outlets, exchanges a large amount of foreign exchanges for.Therefore, research and exploitation walnut further improve its economic worth, seem particularly important.
The fat that contains 60%-70% in the walnut kernel, shelter has first of the woody oleiferous plants, be described as " oil depot on the tree ", the protein of 15%-20%, the carbohydrate of 10%-15% contains multiple elements such as vitamin A, B, E, K, carrotene, riboflavin, thiamine and calcium, phosphorus, iron, copper, brill, selenium, iodine in addition.It mainly is linoleic acid 54.3%, oleic acid 20.3%, leukotrienes 16.8% that the aliphatic acid of walnut oil is formed, wherein linoleic acid, leukotrienes are essential fatty acid, have reducing blood lipid, prevention coronary heart disease and atherosclerotic effect and improve learning memory and retinal reflex ability, effects such as prevention senile dementia and cancer, linoleic acid makes the fine and smooth effect of skin smooth in addition in addition, enjoys the laudatory title of " skin makeup acid ".
Main component is a unrighted acid in the walnut oil, wherein based on linolenic and linoleic.Polyunsaturated fatty acid (PUFA) is ω-6 family of representative with the linoleic acid and is ω-3 family of representative with the alpha-linolenic acid, and the trophism of humans and animals is just extensively come into one's own.
Walnut oil is easy to oxidation deterioration owing to contain a large amount of unrighted acids, final little molecule volatile materials of formation such as aldehyde, ketone, acid, pure epoxides etc., produce the strong impulse smell, promote the oxidation of pigment, fragrance matter and vitamin etc. simultaneously, its original local flavor, nutritive value have been reduced, shortened the shelf-life, lost edibility, so the anti-oxidant problem of walnut oil becomes one of key technology in its production.
Generally address the above problem in the prior art by adding single kind or compound antioxidant.Generally comprise synthetized oxidation preventive agent, for example: 2,6-Butylated Hydroxytoluene (BHT), n-propyl gallate (PG), tens kinds of ditert-butylhydro quinone (TBHQ), BHA, vitamin-c palmitate vinegar etc. also have naturals such as Tea Polyphenols, carotenoid, sesame acid, gossypol, natural VE in addition.
Disclose the oxidation resistance of 3 kinds of antioxidants wherein " research of walnut oil storage-stable " (" grain and oil processing " in March, 2007 such as Zhou Fengjuan, hole Cuiping, Zhang Jinding) and, improved the content of oxidation resistance by adding the synergist synergy.
Reach anti-oxidant purpose by adding the antioxidant mode, have following deficiency: 1) cost height; 2) add the local flavor that some antioxidant reduces walnut oil; 3) because therefore the blocking oxide reaction fully of inhomogeneous row that antioxidant mixes with walnut oil and antioxidant, still can not reach satisfied storage effect.
Summary of the invention
At problems of the prior art, the invention provides a kind of technology of comprehensively assuring quality of walnut oil, it adopts and charge into nitrogen or inert gas in the walnut oil bottle, and effective blocking-up contacts with oxygen, has fundamentally stopped oxidation.
The following technical scheme of the concrete employing of the present invention:
A kind of technology of comprehensively assuring quality of walnut oil is characterized in that, comprises the steps
1) walnut oil finished product can, oily temperature control is at 55-60 ℃;
2) vacuumize, vacuum is greater than 0.8MPa;
3) charge into inert gas or nitrogen, gas pressure intensity is 0.5-1.0MPa.
Described walnut oil physical and chemical index is as follows:
Walnut oil product color, Lovibond be than groove 133.4≤Huang 35 ,≤red 4.0,
Smell, flavour have intrinsic fragrance of walnut oil and flavour, free from extraneous odour;
Transparency clarification, transparent;
Moisture and volatile matter content, %≤0.10;
Insoluble impurities, %≤0.05;
Acid number KOH, mg/g≤1.8;
Peroxide value, mmol/Kg≤7.0;
Solvent residual amount, mg/Kg does not detect;
Heat run (280 ℃) oil colours is constant, no precipitate.
These parameters is according to known concerned countries standard detection in the industry.
Described walnut oil is to make for method or supercritical carbon dioxide extraction method by milling process, organic solvent extractionprocess, water.
The preferred milling process of the present invention, adopt that milling process also needs to comprise depickling, comes unstuck, decolouring, vacuum deodorization step:
Described depickling is that adding concentration is 10～15% sodium hydroxide solution, is 40～65 ℃ of stirrings in temperature, the centrifugal then depickling oil that gets, and the addition of described NaOH calculates according to following formula:
0.713 * 10
-3* oil weight * acid number+0.5 * oil is heavy;
Described coming unstuck is that depickling oil is preheated to 60～65 ℃, and adding oil, to weigh 0.2% concentration be 85% phosphoric acid, after fully mixing, add oil and weigh 3% 60～65 ℃ hot water, stir, when phosphatide is obvious released state, stop to stir, centrifugal filtration gets degummed oil;
Described decolouring is to be 90 ℃ in oily temperature, and vacuum adds oil and weighs 3～5% atlapulgite greater than under the 93.3KPa condition, bleaching time 30min, and decolouring is finished and is cooled to 40 ℃ rapidly, filters;
Described vacuum deodorization is that the oil temperature is 170-180 ℃, and vacuum is greater than under the 101.2KPa condition, and vacuum kept 3～5 hours.
Described inert gas is a kind of in helium, neon, the argon gas.
Compared with prior art, beneficial effect of the present invention is:
1) empirical tests, the present invention preserved under the natural conditions through 18 months, still can keep original local flavor, and technical indicator still meets relevant criterion;
2) the present invention fill the nitrogen that adds or other inertia other with the walnut oil reaction, thereby walnut oil of the present invention stores through long-time, original local flavor still can keep finely;
3) the present invention does not need to add antioxidant, and therefore, cost is low; On the other hand, do not add synthetic antioxidant, belong to " green product ", on market, achieve success easily.
The specific embodiment
Embodiment 1
1) milling process prepares walnut oil
Select fresh walnut kernel, oven dry of peeling back and roasting are fried, (for example: screw press) make the walnut crude oil adopt physical squeezing, adding concentration is 10～15% sodium hydroxide solution, in temperature is 40～65 ℃ of stirrings, the centrifugal then depickling oil that gets, the addition of described NaOH calculates according to following formula: 0.713 * 10
-3* oil weight * acid number+0.5 * oil is heavy; Then depickling oil is preheated to 60～65 ℃, adding oil, to weigh 0.2% concentration be 85% phosphoric acid, after fully mixing, adds oil and weigh 3% 60～65 ℃ hot water, stirs, and when phosphatide is obvious released state, stops to stir, and centrifugal filtration gets degummed oil; Be 90 ℃ in oily temperature then, vacuum adds oil and weighs 3～5% atlapulgite greater than under the 93.3KPa condition, bleaching time 30min, and decolouring is finished and is cooled to 40 ℃ rapidly, filters; In the oil temperature is 170-180 ℃, and vacuum is greater than under the 101.2KPa condition, and vacuum kept 3～5 hours, deodorization.Cooling back can, the can temperature is controlled at 55 ℃.
2) vacuumize, vacuum is 0.8MPa; Charge into nitrogen, gas pressure intensity is 0.5MPa.
3) it is as follows to make the walnut oil physical and chemical index:
Walnut oil product color, Lovibond be than groove 133.4≤Huang 35, and be red 4.0,
Smell, flavour have intrinsic fragrance of walnut oil and flavour, free from extraneous odour;
Transparency clarification, transparent;
Moisture and volatile matter content, % 0.05;
Insoluble impurities 0.04;
Acid number KOH, mg/g 1.6;
Peroxide value, mmol/Kg 7.0;
Solvent residual amount, mg/Kg does not detect;
Heat run (280 ℃) oil colours is constant, no precipitate.
Embodiment 2
1) water is equipped with walnut oil for legal system
Select fresh walnut kernel, also roasting stir-fry of oven dry is worn into slurry with walnut kernel then after the peeling, and slurry is thin more good more, is applied on the thin paper with slip promptly to reach requirement facing to the apparent stain of solar irradiation; Add boiling water in slurry, stir handle by replacing to come out from slurry, oil separation by oscillation is substituted the oily overwhelming majority in the slurry, isolates grease then, staticly settles 10～15 hours, isolates insoluble impurity, obtains walnut oil.
2) walnut oil finished product can, oily temperature control is at 60 ℃; Vacuumize, vacuum is 0.9MPa; Charge into argon gas, gas pressure intensity is 1.0MPa.
3) it is as follows to make the walnut oil physical and chemical index:
Walnut oil product color, Lovibond be than groove 133.4≤Huang 35, and be red 4.0,
Smell, flavour have intrinsic fragrance of walnut oil and flavour, free from extraneous odour;
Transparency clarification, transparent;
Moisture and volatile matter content, % 0.10;
Insoluble impurities 0.05;
Acid number KOH, mg/g 1.3;
Peroxide value, mmol/kg 4.0;
Solvent residual amount, mg/kg does not detect;
Heat run (280 ℃) oil colours is constant, no precipitate.
Embodiment 3
1) supercritical CO
2The fluid extraction walnut oil
Take by weighing 100Kg walnut kernel powder, dress people's barrel is also put in people's extraction kettle, opens refrigeration, cold circulation, heater switch, and design temperature is 45～50 ℃, opens CO
2The operation of valve, turn on pump is also fixed its flow, and adjustings pressure is 25～30MPa, extracts 8～10 hours, extracting pressure is reduced to consistent with separating pressure, and discharging and claim its quality from separating still must walnut oil.
2) walnut oil finished product can, oily temperature control is at 58 ℃; Vacuumize, vacuum is 0.95MPa; Charge into helium, gas pressure intensity is 0.8MPa.
3) it is as follows to make the walnut oil physical and chemical index:
Walnut oil product color, Lovibond be than groove 133.4≤Huang 35, and be red 4.0,
Smell, flavour have intrinsic fragrance of walnut oil and flavour, free from extraneous odour;
Transparency clarification, transparent;
Moisture and volatile matter content, % 0.02;
Insoluble impurities 0.01;
Acid number KOH, mg/g 1.0;
Peroxide value, mmol/kg 5.0;
Solvent residual amount, mg/kg does not detect;
Heat run (280 ℃) oil colours is constant, no precipitate.
The above embodiments of the present invention are can not limit the present invention to explanation of the present invention, in implication suitable with claims of the present invention and any change and the combination in the scope, all should think in the scope of claims.
Claims (6)
1. the technology of a comprehensively assuring quality of walnut oil is characterized in that, comprises the steps
1) walnut oil finished product can, oily temperature control is at 55-60 ℃;
2) vacuumize, vacuum is greater than 0.8MPa;
3) charge into inert gas or nitrogen, gas pressure intensity is 0.5-1.0MPa.
2. the technology of comprehensively assuring quality of walnut oil according to claim 1 is characterized in that, described walnut oil physical and chemical index is as follows:
Walnut oil product color, Lovibond be than groove 133.4≤Huang 35 ,≤red 4.0,
Smell, flavour have intrinsic fragrance of walnut oil and flavour, free from extraneous odour;
Transparency clarification, transparent;
Moisture and volatile matter content, %≤0.10;
Insoluble impurities, %≤0.05;
Acid number KOH, mg/g≤1.8;
Peroxide value, mmol/Kg≤7.0;
Solvent residual amount, mg/Kg does not detect;
Heat run (280 ℃) oil colours is constant, no precipitate.
3. the technology of comprehensively assuring quality of walnut oil according to claim 2 is characterized in that, described walnut oil is for method or supercritical CO by milling process, organic solvent extractionprocess, water
2The fluid extraction method makes.
4. the technology of comprehensively assuring quality of walnut oil according to claim 3 is characterized in that, described walnut oil is to adopt milling process to make, and comprises depickling, comes unstuck, decolouring, vacuum deodorization step:
Described depickling is that adding concentration is 10～15% sodium hydroxide solution, is 40～65 ℃ of stirrings in temperature, the centrifugal then depickling oil that gets, and the addition of described NaOH calculates according to following formula:
0.713 * 10
-3* oil weight * acid number+0.5 * oil is heavy;
Described coming unstuck is that depickling oil is preheated to 60～65 ℃, and adding oil, to weigh 0.2% concentration be 85% phosphoric acid, after fully mixing, add oil and weigh 3% 60～65 ℃ hot water, stir, when phosphatide is obvious released state, stop to stir, centrifugal filtration gets degummed oil;
Described decolouring is to be 90 ℃ in oily temperature, and vacuum adds oil and weighs 3～5% atlapulgite greater than under the 93.3KPa condition, bleaching time 30min, and decolouring is finished and is cooled to 40 ℃ rapidly, filters;
Described vacuum deodorization is that the oil temperature is 170-180 ℃, and vacuum is greater than under the 101.2KPa condition, and vacuum kept 3～5 hours.
5. the technology of comprehensively assuring quality of walnut oil according to claim 1 is characterized in that, described inert gas is a kind of in helium, neon, the argon gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810016996A CN101617722A (en) | 2008-07-03 | 2008-07-03 | Process for comprehensively assuring quality of walnut oil |
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| CN200810016996A CN101617722A (en) | 2008-07-03 | 2008-07-03 | Process for comprehensively assuring quality of walnut oil |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104543047A (en) * | 2015-02-09 | 2015-04-29 | 陕西大统投资股份有限公司 | Preservation method of cold-squeezed walnut oil |
| CN106675764A (en) * | 2016-12-05 | 2017-05-17 | 三门峡华阳食品有限公司 | Production process for extracting walnut oil |
| CN107267284A (en) * | 2017-07-31 | 2017-10-20 | 大姚广益发展有限公司 | A kind of high-purity vegetable oil and its production method |
| CN111171951A (en) * | 2020-01-10 | 2020-05-19 | 重庆市三品功能食品研究院有限公司 | Preparation method of walnut oil for pregnant women and infants |
-
2008
- 2008-07-03 CN CN200810016996A patent/CN101617722A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104543047A (en) * | 2015-02-09 | 2015-04-29 | 陕西大统投资股份有限公司 | Preservation method of cold-squeezed walnut oil |
| CN106675764A (en) * | 2016-12-05 | 2017-05-17 | 三门峡华阳食品有限公司 | Production process for extracting walnut oil |
| CN107267284A (en) * | 2017-07-31 | 2017-10-20 | 大姚广益发展有限公司 | A kind of high-purity vegetable oil and its production method |
| CN111171951A (en) * | 2020-01-10 | 2020-05-19 | 重庆市三品功能食品研究院有限公司 | Preparation method of walnut oil for pregnant women and infants |
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Application publication date: 20100106 |