CN109370768A - A kind of camellia oil and preparation method thereof that content of phytosterol is high - Google Patents
A kind of camellia oil and preparation method thereof that content of phytosterol is high Download PDFInfo
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- CN109370768A CN109370768A CN201811394743.6A CN201811394743A CN109370768A CN 109370768 A CN109370768 A CN 109370768A CN 201811394743 A CN201811394743 A CN 201811394743A CN 109370768 A CN109370768 A CN 109370768A
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B1/00—Production of fats or fatty oils from raw materials
- C11B1/02—Pretreatment
- C11B1/04—Pretreatment of vegetable raw material
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23D—EDIBLE OILS OR FATS, e.g. MARGARINES, SHORTENINGS, COOKING OILS
- A23D9/00—Other edible oils or fats, e.g. shortenings, cooking oils
- A23D9/02—Other edible oils or fats, e.g. shortenings, cooking oils characterised by the production or working-up
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B1/00—Production of fats or fatty oils from raw materials
- C11B1/06—Production of fats or fatty oils from raw materials by pressing
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B3/00—Refining fats or fatty oils
- C11B3/001—Refining fats or fatty oils by a combination of two or more of the means hereafter
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B3/00—Refining fats or fatty oils
- C11B3/008—Refining fats or fatty oils by filtration, e.g. including ultra filtration, dialysis
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B3/00—Refining fats or fatty oils
- C11B3/16—Refining fats or fatty oils by mechanical means
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- Oil, Petroleum & Natural Gas (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
A kind of preparation method for the camellia oil that content of phytosterol is high, include the following steps: to produce tea seed kernel and rice bran mixture, tea seed is dried, is cleaned, is shelled, selects excellent impurity elimination, curing, the rice bran fried is added to stir evenly, mixture is obtained, wherein rice bran and the tea seed kernel weight ratio after curing are 1:5-10；Then by squeezing twice, obtained camellia oil content of phytosterol is high, and quality is high.
Description
Technical field
The invention belongs to agricultural technology fields, and in particular to a kind of camellia oil that content of phytosterol is high and its preparation side
Method.
Background technique
Vegetable oil is one of content of phytosterol food more abundant, is white powder, can also have ester shape to be dissolved in grease,
Phytosterol is divided into 4- demethlyate sterol, 4- methylsterol and 4,4 '-dimethylsterols three classes, and demethlyate sterol mainly has Β-
Sitosterol, stigmasterol, campesterol and brassicasterol etc. are primarily present in the structure of phytosterol and animal in the seed of plant
The structure of property sterol is substantially similar, is uniquely a difference in that the difference of c-4 connected number of methyl groups and c-11 side chains, exactly this
Small different causes on a little side chains make it have various physiological functions.
Phytosterol is used for the heart disease of prophylactic treatment coronary atherosclerosis class, to treatment ulcer, Skin Squamous Cell Carcinoma, palace
Neck cancer etc. has apparent curative effect；In addition, phytosterol is also important the raw materials for production of steroid drugs and vitamine D3.Plant steroid
Alcohol has good antioxidant, can make food additives (antioxidant, nutritional additive)；Also it is former to can be used as growth of animal agent
Material promotes growth of animal, promotes animal health.
What content of phytosterol was minimum in vegetable oil is camellia oil, content be only 110mg/100g or so namely content only
It is 0.1% or so；And content is 4.5-6.5% in rice bran oil, in order to improve content of phytosterol in tea oil, keeps its nutrition balanced,
Rice bran can be added to extract oil together.
Summary of the invention
There is provided it is an object of the invention to overcome the deficiencies in the prior art a kind of camellia oil that content of phytosterol is high and
Preparation method.
The technical scheme is that a kind of preparation method for the camellia oil that content of phytosterol is high, successively includes as follows
Step:
(1) tea seed kernel and rice bran mixture are produced: tea seed being dried, is cleaned, is shelled, selects excellent impurity elimination, curing, addition fries
Rice bran stir evenly, obtain mixture, wherein rice bran and curing after tea seed kernel weight ratio be 1:5-10；Rice bran was added
Few, obtained oily content of phytosterol is low, and rice bran is added excessively, and oil production is low, and production efficiency is low；
(2) single pressing: the mixture that step (1) is obtained squeezes camellia oil sedimentation filtration into oil press, obtains oil cake；
(3) twice pressing: adding camellia oil into oil cake, obtains withered oil cake mixture, wherein making in withered oil cake mixture
Reach 25-30 mass % containing camellia oil；The crusher that withered oil cake mixture is put into after an other preheating is squeezed, is filtered
To thick camellia oil and filter residue；
(4) it cleans: including stirring growing the grain, being filtered to remove crystal, it is specific as follows: the thick camellia oil cooling 30- that step (3) is obtained
40 DEG C, the first stage: speed of agitator 50-60r/min is first cooled to 15-20 DEG C with 2.0-4.0 DEG C/h of speed, then with
1.5-2.0 DEG C/h of speed is cooled to 8-10 DEG C；Second stage, speed of agitator 10-20r/min, first with 0.4-0.6 DEG C/it is small
When speed be cooled to 2-3 DEG C, then be cooled to -1-0 DEG C with 0.2-0.3 DEG C/h of speed；The Freeze crystallization time is
20-25 hours；24-30h is stirred in stirring, speed of agitator 20-30r/min, holding at this temperature；Then it is cooled to -10--5
DEG C, it is stirred growing the grain, speed of agitator 5-10r/min keeps growing the grain 5-9h at this temperature, precipitates crystal；It is filtered to remove crystalline substance
Body；Obtain camellia oil.
The filter residue that step of the present invention (3) obtains, the weight with camellia oil can also be added during step (4) stirring growing the grain
The camellia oil purity is high obtained than the tea seed cake for 1-2:100, is added, the crystal of precipitation have BaP, wax, colloid, moisture and
It is wrapped in the harmful substances such as heavy metal therein, pesticide residue, protein, cellulose.
Curing described in step (1) is that parch curing is carried out to tea seed kernel, and parch temperature is 130-150 DEG C, tea seed kernel water
Sub-control system is changed into yellow or yellowish-brown from faint yellow in 3-5 mass %, tea seed kernel color.
Step (2) is that the mixture for obtaining step (1) is cooled to 50-80 DEG C, is squeezed into oil press.
Camellia oil is added excessive in step (3), be easy to cause waste, and addition is very few, and the moist degree of rice bran is inadequate, wherein
Oil yield it is low.
Need to carry out water before traditional rice bran oil expression and steam moisture absorption, finally to carry out heating aquation dehydration, nutrition therein at
Phosphatide is divided also to be deviate from, and the rice bran oil after aquation is apt to deteriorate, rice bran oil is squeezed in camellia oil and formed by the method for the present invention
Ready-mixed oil not only simplifies the milling process of rice bran oil, also adds the content of phytosterol in camellia oil, keeps its nutrition balanced.
The method of the present invention further includes following steps:
(5) filling: nitrogen charging is filling.
The invention also includes the camellia oil that above method is prepared, content of phytosterol 300-400mg/100g.
Specific embodiment
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and should not be taken as limiting the scope of the invention.
Embodiment 1
(1) tea seed kernel and rice bran mixture are produced: tea seed being dried, is cleaned, is shelled, selects excellent impurity elimination, curing, addition fries
Rice bran stir evenly, obtain mixture, wherein rice bran and curing after tea seed kernel weight ratio be 1:7；
(2) single pressing: being cooled to 50-60 DEG C for the mixture that step (1) obtains, and settled into oil press squeezing camellia oil
Filter obtains oil cake；
(3) twice pressing: adding camellia oil into oil cake, obtains withered oil cake mixture, wherein making in withered oil cake mixture
Reach 30 mass % containing camellia oil；The crusher that withered oil cake mixture is put into after an other preheating is squeezed, mountain is obtained by filtration
Tea oil and filter residue；
(4) the thick camellia oil that step (3) obtains is cooled to 35-40 DEG C, the first stage: speed of agitator 60r/min, first with 4.0
DEG C/h speed be cooled to 20 DEG C, then be cooled to 10 DEG C with 2.0 DEG C/h of speed；Second stage, speed of agitator 20r/
Min is first cooled to 2-3 DEG C with 0.6 DEG C/h of speed, then is cooled to -1-0 DEG C with 0.3 DEG C/h of speed；Freezing and crystallizing
Handling the time is 25 hours；24-30h is stirred in stirring, speed of agitator 20r/min, holding at this temperature；Then be cooled to-
10--8 DEG C, it is stirred growing the grain, speed of agitator 5r/min keeps growing the grain 5h at this temperature, precipitates crystal；It is filtered to remove crystalline substance
Body；Obtain camellia oil；
(5) filling: nitrogen charging is filling.
Embodiment 2
(1) tea seed kernel and rice bran mixture are produced, tea seed is dried, is cleaned, is shelled, selects excellent impurity elimination, curing, addition fries
Rice bran stir evenly, obtain mixture, wherein rice bran and curing after tea seed kernel weight ratio be 1:7；
(2) single pressing: being cooled to 50-60 DEG C for the mixture that step (1) obtains and squeeze camellia oil sedimentation filtration into oil press,
Obtain oil cake；
(3) twice pressing: adding camellia oil into oil cake, obtains withered oil cake mixture, wherein making in withered oil cake mixture
Reach 30 mass % containing camellia oil；The crusher that withered oil cake mixture is put into after an other preheating is squeezed, is obtained by filtration thick
Camellia oil and filter residue；
(4) clean: the filter residue for step (3) will be added in thick camellia oil that step (3) obtains obtaining, the weight ratio with camellia oil are
2:100, cooling is as 35-40 DEG C, and the first stage: speed of agitator 60r/min is first cooled to 20 with 4.0 DEG C/h of speed
DEG C, then 10 DEG C are cooled to 2.0 DEG C/h of speed；Second stage, speed of agitator 20r/min, first with 0.6 DEG C/h of speed
Degree is cooled to 2-3 DEG C, then is cooled to -1-0 DEG C with 0.3 DEG C/h of speed；The Freeze crystallization time is 25 hours；Stirring,
Speed of agitator is 20r/min, and 24-30h is stirred in holding at this temperature；Then -10--8 DEG C are cooled to, growing the grain is stirred, is stirred
Revolving speed is 5r/min, keeps growing the grain 5h at this temperature, precipitates crystal；It is filtered to remove crystal；Obtain camellia oil；
(5) filling: nitrogen charging is filling.
Embodiment 3
(1) tea seed kernel and rice bran mixture are produced: taking fresh tea seed, dried, cleaned, shelled, selecting excellent impurity elimination, curing, added
Enter the rice bran fried to stir evenly, obtain mixture, wherein rice bran and the tea seed kernel weight ratio after curing are 1:9；
(2) single pressing: being cooled to 50-60 DEG C for the mixture that step (1) obtains and squeeze camellia oil sedimentation filtration into oil press,
Obtain oil cake；
(3) twice pressing: adding camellia oil into oil cake, obtains withered oil cake mixture, wherein making in withered oil cake mixture
Reach 30 mass % containing camellia oil；The crusher that withered oil cake mixture is put into after an other preheating is squeezed, is obtained by filtration thick
Camellia oil and filter residue；
(4) clean: the filter residue for step (3) will be added in thick camellia oil that step (3) obtains obtaining, the weight ratio with camellia oil are
1.5:100 cools down 35-40 DEG C, the first stage: speed of agitator 60r/min is first cooled to 20 DEG C with 4.0 DEG C/h of speed,
10 DEG C are cooled to again with 2.0 DEG C/h of speed；Second stage, speed of agitator 20r/min, first with 0.6 DEG C/h of speed
It is cooled to 2-3 DEG C, then is cooled to -1-0 DEG C with 0.3 DEG C/h of speed；The Freeze crystallization time is 25 hours；Stirring, is stirred
Mixing revolving speed is 20r/min, and 24-30h is stirred in holding at this temperature；Then -10--8 DEG C are cooled to, growing the grain is stirred, stirring turns
Speed is 5r/min, keeps growing the grain 5h at this temperature, precipitates crystal；It is filtered to remove crystal；Obtain camellia oil；；
(5) filling: nitrogen charging is filling.
Embodiment 4
(1) tea seed kernel and rice bran mixture are produced: taking fresh tea seed, dried, cleaned, shelled, selecting excellent impurity elimination, curing, added
Enter the rice bran fried to stir evenly, obtain mixture, wherein rice bran and the tea seed kernel weight ratio after curing are 1:9；
(2) single pressing: being cooled to 50-60 DEG C for the mixture that step (1) obtains and squeeze camellia oil sedimentation filtration into oil press,
Obtain oil cake；
(3) twice pressing: adding camellia oil into oil cake, obtains withered oil cake mixture, wherein making in withered oil cake mixture
Reach 25 mass % containing camellia oil；The crusher that withered oil cake mixture is put into after an other preheating is squeezed, is obtained by filtration thick
Camellia oil and filter residue；
(4) clean: the filter residue for step (3) will be added in thick camellia oil that step (3) obtains obtaining, the weight ratio with camellia oil are
1:100 is cooled to 35-40 DEG C, the first stage: speed of agitator 60r/min, is first cooled to 20 DEG C with 4.0 DEG C/h of speed,
10 DEG C are cooled to again with 2.0 DEG C/h of speed；Second stage, speed of agitator 20r/min, first with 0.6 DEG C/h of speed
It is cooled to 2-3 DEG C, then is cooled to -1-0 DEG C with 0.3 DEG C/h of speed；The Freeze crystallization time is 25 hours；Stirring, is stirred
Mixing revolving speed is 20r/min, and 24-30h is stirred in holding at this temperature；Then -10--8 DEG C are cooled to, growing the grain is stirred, stirring turns
Speed is 5r/min, keeps growing the grain 5h at this temperature, precipitates crystal；It is filtered to remove crystal；Obtain camellia oil；
(5) filling: nitrogen charging is filling.
Comparative example 1
(1) it produces tea seed kernel: tea seed being dried, is cleaned, is shelled, selects excellent impurity elimination, curing；
(2) single pressing: being cooled to 50-60 DEG C for the mixture that step (1) obtains, and settled into oil press squeezing camellia oil
Filter obtains oil cake；
(3) twice pressing: adding camellia oil into oil cake, obtains withered oil cake mixture, wherein making in withered oil cake mixture
Reach 30 mass % containing camellia oil；The crusher that withered oil cake mixture is put into after an other preheating is squeezed, is obtained by filtration thick
Camellia oil and filter residue；
(4) it cleans: including stirring growing the grain, being filtered to remove crystal, it is specific as follows: the thick camellia oil that step (3) obtains is cooled to
35-40 DEG C, the first stage: speed of agitator 60r/min is first cooled to 20 DEG C with 4.0 DEG C/h of speed, then with 2.0 DEG C/it is small
When speed be cooled to 10 DEG C；Second stage, speed of agitator 20r/min are first cooled to 2-3 DEG C with 0.6 DEG C/h of speed,
- 1-0 DEG C are cooled to again with 0.3 DEG C/h of speed；The Freeze crystallization time is 25 hours；Stirring, speed of agitator 20r/
24-30h is stirred in min, holding at this temperature；Then -10--8 DEG C are cooled to, is stirred growing the grain, speed of agitator 5r/min,
Growing the grain 5h at this temperature is kept, is precipitated crystal；It is filtered to remove crystal；Obtain camellia oil；
(5) filling: nitrogen charging is filling.
Comparative example 1 is not add rice bran with the difference of embodiment 1, using comparative example in following example 5 step (4)
The filter residue that step (3) obtains.
Embodiment 5
(1) tea seed kernel and rice bran mixture are produced, tea seed is dried, is cleaned, is shelled, selects excellent impurity elimination, curing, addition fries
Rice bran stir evenly, obtain mixture, wherein rice bran and curing after tea seed kernel weight ratio be 1:7；
(2) single pressing: being cooled to 50-60 DEG C for the mixture that step (1) obtains and squeeze camellia oil sedimentation filtration into oil press,
Obtain oil cake；
(3) twice pressing: adding camellia oil into oil cake, obtains withered oil cake mixture, wherein making in withered oil cake mixture
Reach 30 mass % containing camellia oil；The crusher that withered oil cake mixture is put into after an other preheating is squeezed, mountain is obtained by filtration
Tea oil and filter residue；
(4) it cleans: the filter residue for 1 step of comparative example (3) will be added in camellia oil that step (3) obtains obtaining, the weight with camellia oil
Amount is than being 2:100, and be cooled to 30-40 DEG C of cooling, the first stage: speed of agitator 60r/min is first dropped with 4.0 DEG C/h of speed
Temperature is cooled to 10 DEG C to 20 DEG C, then with 2.0 DEG C/h of speed；Second stage, speed of agitator 20r/min, first with 0.6 DEG C/it is small
When speed be cooled to 2-3 DEG C, then be cooled to -1-0 DEG C with 0.3 DEG C/h of speed；The Freeze crystallization time is 25 small
When；24-30h is stirred in stirring, speed of agitator 20r/min, holding at this temperature；Then -10--8 DEG C are cooled to, is stirred
Growing the grain, speed of agitator 5r/min keep growing the grain 5h at this temperature, precipitate crystal；It is filtered to remove crystal；Obtain camellia oil；
(5) filling: nitrogen charging is filling.
Statistics is shown in Table 1.
Table 1
。
It can be seen that the tea-seed oil content of phytosterol that the method for the present invention obtains is high, and quality is high.
The above content describes basic principles and main features of the invention, and the present invention is not limited to the above embodiments,
Without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements are all
It falls into scope of the claimed invention.
Claims (6)
1. a kind of preparation method for the camellia oil that content of phytosterol is high, it is characterised in that in turn include the following steps:
(1) tea seed kernel and rice bran mixture are produced: tea seed being dried, is cleaned, is shelled, selects excellent impurity elimination, curing, addition fries
Rice bran stir evenly, obtain mixture, wherein rice bran and curing after tea seed kernel weight ratio be 1:5-10；
(2) single pressing: the mixture that step (1) is obtained squeezes camellia oil sedimentation filtration into oil press, obtains oil cake；
(3) twice pressing: adding camellia oil into oil cake, obtains withered oil cake mixture, wherein making in withered oil cake mixture
Reach 25-30 mass % containing camellia oil；The crusher that withered oil cake mixture is put into after an other preheating is squeezed, is filtered
To thick camellia oil and filter residue；
(4) the thick camellia oil obtained step (3) cools down 30-40 DEG C, the first stage: speed of agitator 50-60r/min, first with
2.0-4.0 DEG C/h of speed is cooled to 15-20 DEG C, then is cooled to 8-10 DEG C with 1.5-2.0 DEG C/h of speed；Second-order
Section, speed of agitator 10-20r/min are first cooled to 2-3 DEG C with 0.4-0.6 DEG C/h of speed, then with 0.2-0.3 DEG C/h
Speed be cooled to -1-0 DEG C；The Freeze crystallization time is 20-25 hours；Stirring, speed of agitator 20-30r/min are kept
24-30h is stirred at this temperature；Then -10--5 DEG C are cooled to, is stirred growing the grain, speed of agitator 5-10r/min, keeping should
At a temperature of growing the grain 5-9h, precipitate crystal；It is filtered to remove crystal；Obtain camellia oil.
2. the preparation method of the high camellia oil of content of phytosterol according to claim 1, it is characterised in that step (1) institute
The curing stated is that parch curing is carried out to tea seed kernel, and parch temperature is 130-150 DEG C, and tea seed kernel moisture is controlled in 3-5 mass %,
Tea seed kernel color is changed into yellow or yellowish-brown from faint yellow.
3. the preparation method of the high camellia oil of content of phytosterol according to claim 1, it is characterised in that step (2) be by
The mixture that step (1) obtains is cooled to 50-80 DEG C, squeezes into oil press.
4. the preparation method of the high camellia oil of content of phytosterol according to claim 1, it is characterised in that step (4) stirring
It is additionally added the filter residue that step (3) obtains during growing the grain, the weight ratio with camellia oil is 1-2:100.
5. the preparation method of the high camellia oil of content of phytosterol according to claim 1, it is characterised in that further include as follows
Step:
(5) filling: nitrogen charging is filling.
6. the camellia oil that -5 any the methods are prepared according to claim 1, content of phytosterol 300-400mg/
100g。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113583749A (en) * | 2021-07-27 | 2021-11-02 | 铜仁学院 | Preparation method of ecological tea oil |
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| CN103960377A (en) * | 2014-05-26 | 2014-08-06 | 赖琼玮 | Woody corn oil and preparation method thereof |
| CN104263503A (en) * | 2014-10-08 | 2015-01-07 | 湖南大三湘油茶科技有限公司 | Highly-fragrant camellia oil and preparation method thereof |
| CN104789349A (en) * | 2015-03-31 | 2015-07-22 | 湖南大三湘油茶科技有限公司 | Super virgin camellia oil and preparation method thereof |
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2018
- 2018-11-22 CN CN201811394743.6A patent/CN109370768A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103960377A (en) * | 2014-05-26 | 2014-08-06 | 赖琼玮 | Woody corn oil and preparation method thereof |
| CN104263503A (en) * | 2014-10-08 | 2015-01-07 | 湖南大三湘油茶科技有限公司 | Highly-fragrant camellia oil and preparation method thereof |
| CN104789349A (en) * | 2015-03-31 | 2015-07-22 | 湖南大三湘油茶科技有限公司 | Super virgin camellia oil and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113583749A (en) * | 2021-07-27 | 2021-11-02 | 铜仁学院 | Preparation method of ecological tea oil |
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