Paeonia suffruticosa seed oil preparation method for physically squeezing peony seeds, peony seed oil and application

Abstract

The invention relates to the technical field of food processing, and particularly discloses a preparation method of peony seed oil obtained by physically squeezing peony seeds, the peony seed oil and application, the preparation method of the peony seed oil obtained by physically squeezing the peony seeds comprises the following steps: carrying out microwave heating treatment on pretreated dried peony seeds; uniformly mixing the dried peony seeds subjected to microwave heating with soybean seed coats; physically squeezing the mixed dried peony seeds and soybean seed coats to obtain crude oil; and centrifuging and filtering the crude oil to obtain the peony seed oil. According to the method, the peony seeds are physically squeezed by combining the microwave technology and adding the soybean seed coats, the oil extraction rate of the peony seeds of the physical squeezing method is increased, the physical squeezing method is free of solvent residues, the process is relatively simple, and the body health of consumers can be better guaranteed. According to the method, the oil yield is increased for enterprises for preparing the peony seed oil, the environmental pollution is reduced, the process is simple, the economic cost is reduced, and the method is suitable for industrial production.

Description

Technical Field

[0001] The invention relates to the technical field of food processing, and in particular to a method for preparing peony seed oil by physically squeezing peony seeds, the peony seed oil and applications thereof. Background Art

[0002] Peony is a perennial deciduous shrub with high ornamental, medicinal, cultural and edible value. It has the effects of clearing heat and promoting blood circulation, anti-inflammatory and antibacterial. Peony seed oil is a golden transparent liquid extracted from peony seeds. It is rich in unsaturated fatty acids, paeonol, phytosterols, squalene and other beneficial ingredients. The high quality, high nutrition and high value of peony seed oil meet the needs of edible oil consumption upgrade in the new era, and the market development potential is huge. Peony oil is a new type of woody oil crop with great development potential. It has been widely used in the production of cosmetics, health products, beverages and edible oils.

[0003] The field of food research has conducted many studies on the extraction and application of peony seed oil. For example, under the conditions of acid leaching and baking pretreatment, the water enzyme method is used to extract peony seed oil, which improves the quality of peony seed oil; or under the conditions of high-temperature steaming pretreatment, the ethanol-assisted water enzyme method is used to extract peony seed oil, which improves the extraction rate of peony seed oil; and the alkali solution is boiled at high temperature and then combined with steam explosion treatment to expose more enzymatic reaction sites in peony seed cells, making it easier for oil to be quickly released from the encapsulated state to complete the extraction of peony seed oil.

[0004] The above production methods of peony seed oil require high temperature treatment or the use of aqueous enzyme method. Although this preparation method improves the oil yield, the process is complicated and the economic cost is high. Summary of the invention

[0005] Based on this, the present invention proposes a peony seed oil preparation method, peony seed oil and application thereof which have high oil yield, improve the quality of peony seed oil, reduce environmental pollution, have simple process, reduce economic cost and are suitable for industrial production by physically pressing peony seeds.

[0006] According to a first aspect of the present invention, there is provided a method for preparing peony seed oil by physically squeezing peony seeds, comprising the following steps:

[0007] The pretreated dried peony seeds are subjected to microwave heating treatment;

[0008] Evenly mixing the microwave-heated dried peony seeds and soybean seed coats;

[0009] Physically screw pressing the mixed dried peony seeds and soybean seed coats to obtain crude oil;

[0010] The crude oil is centrifuged and filtered to obtain peony seed oil.

[0011] According to an embodiment of the present invention, the preprocessing comprises the following steps:

[0012] Weighing peeled peony seeds and drying them to obtain the dried peony seeds;

[0013] The moisture content of the dried peony seeds is less than 8%.

[0014] According to an embodiment of the present invention, the specific conditions for the drying are: a drying temperature of 60° C.-100° C., and a drying time of 1 h-3 h.

[0015] According to an embodiment of the present invention, the specific conditions of the microwave heating treatment are microwave power 320w-800w, and microwave time 5-20min.

[0016] According to an embodiment of the present invention, the mass of the added soybean seed coat is 10-30% of the mass of the dry peony seeds.

[0017] According to an embodiment of the present invention, the pressing temperature is 180-220°C.

[0018] According to an embodiment of the present invention, the specific conditions for centrifugation are a centrifugal speed of 3000-4000 rpm and a centrifugal time of 10-20 min.

[0019] According to an embodiment of the present invention, the pretreatment further comprises: screening the soybean hull powder to a particle size of 3-4 mm.

[0020] According to a second aspect of the present invention, a peony seed oil obtained by the above-mentioned method for preparing peony seed oil by physically pressing peony seeds is provided.

[0021] According to a third aspect of the present invention, there is provided an application of the above-mentioned preparation method in industrial production.

[0022] It can be seen from the above technical scheme that the method for preparing peony seed oil by physically squeezing peony seeds, peony seed oil and application provided by the present invention have the following beneficial effects:

[0023] The method for preparing peony seed oil by physically squeezing peony seeds provided by the present invention improves the oil yield of peony seeds by the physical squeezing method by combining microwave technology with adding soybean seed coat, and the physical squeezing method has no solvent residue, the process is relatively simple, and the health of consumers can be better protected. The present invention improves the oil yield of enterprises producing peony seed oil, reduces environmental pollution, has a simple process, reduces economic costs, and is suitable for industrial production.

[0024] The present invention provides a method for preparing peony seed oil by physically squeezing peony seeds, and microwave heating technology has the characteristics of fast heating speed, uniform heating, energy saving and environmental protection, and has been widely used in the field of food processing. Soybean seed coat is a byproduct of soybean oil production process, and its main components are cell wall and plant fiber, wherein the crude fiber content is relatively high. After microwave heating, soybean seed coat is mixed with peony seeds and squeezed to increase the friction with peony seeds during squeezing, so that the peony seed cell wall is damaged, and the oil yield of peony seeds is improved. The technology of the present invention improves the economic benefit for enterprises producing peony seed oil, and the process is simple and suitable for large-scale industrial production, and the physical squeezing method has no solvent residue, which better protects the health of consumers and reduces environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the peony seed oil test report of Example 1 of the present invention;

[0026] Figure 2 This is a picture of peony seed oil according to Example 1 of the present invention. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0028] According to a first aspect of the present invention, there is provided a method for preparing peony seed oil by physically squeezing peony seeds, comprising the following steps:

[0029] The pretreated dried peony seeds are subjected to microwave heating treatment;

[0030] Evenly mixing the microwave-heated dried peony seeds and soybean seed coats;

[0031] Physically screw pressing the mixed dried peony seeds and soybean seed coats to obtain crude oil;

[0032] The crude oil is centrifuged and filtered to obtain peony seed oil.

[0033] The chamber pressure of the screw oil press is one of the important factors affecting the oil yield. The pressure in the chamber is generated by the compression of the oil due to the gradual reduction of the free volume in the chamber when the pressing shaft rotates; the greater the chamber pressure, the greater the deformation of the oil cells, and the easier it is for the oil to be discharged. Therefore, mixing a certain proportion of soybean seed coat into the unpressed peony kernel material can make it easier to form a dense space in the chamber, which can make it easier to generate strong pressure in the chamber, fully squeeze out the oil in the oil cells, and prolong the deformation period of the elastic-plastic deformation of the peony kernel, resulting in an increase in the oil output time and an increase in the oil output rate. In addition, the components such as lignin, cellulose and hemicellulose in the soybean seed coat play a key role in the peony kernel pressing process. These components help to form a physical channel for oil transport, making it easier for oil to flow out of the peony kernel. Compared with the densely compacted oil cake, the channel for oil outflow is smoother after adding soybean seed coat, thereby improving the oil extraction rate.

[0034] According to an embodiment of the present invention, the preprocessing comprises the following steps:

[0035] Weighing peeled peony seeds and drying them to obtain the dried peony seeds;

[0036] The moisture content of the dried peony seeds is less than 8%.

[0037] According to an embodiment of the present invention, the specific conditions for the drying are: a drying temperature of 60° C.-100° C., and a drying time of 1 h-3 h.

[0038] According to an embodiment of the present invention, the specific conditions of the microwave heating treatment are microwave power 320w-800w, and microwave time 5-20min.

[0039] According to an embodiment of the present invention, the mass of the added soybean seed coat is 10-30% of the mass of the dry peony seeds.

[0040] According to an embodiment of the present invention, the pressing temperature is 180-220°C.

[0041] According to an embodiment of the present invention, the specific conditions for centrifugation are a centrifugal speed of 3000-4000 rpm and a centrifugal time of 10-20 min.

[0042] According to an embodiment of the present invention, the pretreatment further comprises: screening the soybean hull powder to a particle size of 3-4 mm.

[0043] According to a second aspect of the present invention, a peony seed oil obtained by the above-mentioned method for preparing peony seed oil by physically pressing peony seeds is provided.

[0044] According to a third aspect of the present invention, there is provided an application of the above-mentioned preparation method in industrial production.

[0045] The technical solution of the present invention is described in detail below through preferred embodiments. It should be noted that the specific embodiments below are only used for illustration and are not used to limit the present invention.

[0046] Example 1

[0047] Weigh 100 g of peony seed kernels, put them into an oven for drying, set the drying temperature to 100 ° C, dry them until the water content of the peony seeds is 8%, and the drying time is 2 h;

[0048] The dried peony seeds were placed on a baking tray for microwave treatment, with a microwave power of 640 W and a microwave time of 10 min;

[0049] Weigh 20% of the weight of the soybean husks of the dried peony seeds after microwave treatment, and evenly mix the soybean husks and the dried peony seeds;

[0050] The mixed dried peony seeds and soybean seed coats were placed in an oil press for physical pressing at a temperature of 200°C to obtain crude oil;

[0051] The crude oil was centrifuged at a speed of 4000 rpm for 10 min, and the upper clear oil was filtered to obtain peony seed oil.

[0052] Example 2-3

[0053] The rest is the same as Example 1, except that the drying temperatures are 60° C. and 80° C., respectively, as Examples 2 and 3.

[0054] Embodiment 4-6

[0055] The rest is the same as Example 1, except that the microwave powers are 320w, 480w and 800w, respectively, as Example 4, Example 5 and Example 6.

[0056] Embodiment 7-9

[0057] The rest is the same as Example 1, except that the microwave time is 5 min, 15 min and 20 min, respectively, as Example 7, Example 8 and Example 9.

[0058] Examples 10-14

[0059] The rest is the same as Example 1, except that the mass of soybean seed coat is 5%, 10%, 15%, 25% and 30% of the mass of peony seeds, respectively as Example 10, Example 11, Example 12, Example 13 and Example 14.

[0060] Comparative Example 1

[0061] Except that microwave was not used and soybean husk was added for oil extraction, other aspects were the same as those of Example 1.

[0062] Comparative Example 2

[0063] Except that drying is not performed, the other steps are the same as those in Example 1.

[0064] Experimental Example 1:

[0065] 1. Drying conditions

[0066] Table 1 Test results under different drying conditions

[0067]

[0068] Peony seeds themselves contain a certain amount of moisture, and the drying step can disperse the moisture of peony seeds. It can be seen from Table 1 that the best drying condition is drying at 100°C for 2 hours. At this time, the remaining moisture of peony seeds is 7.6-8%, and the average oil yield is the highest. Therefore, this drying condition is selected for subsequent experiments.

[0069] 2. Microwave Heating Conditions

[0070] (1) Microwave power

[0071] Table 2 Measurement results under different microwave power conditions

[0072]

[0073]

[0074] As shown in Table 2, under the microwave conditions of microwave power of 320w, 480w, and 800w and microwave time of 10min, the average oil yield was different, but the change was not significant. When the microwave power was 640w, the average oil yield of peony seeds was the highest, so this microwave power was selected for subsequent experiments.

[0075] The possible reason is that microwave pretreatment causes structural expansion inside the grain. During the microwave pretreatment process, the moisture inside the grain is continuously vaporized and accumulated, causing a pressure difference inside and outside the grain. When the pressure difference exceeds the bearing capacity of the cortical fibers, the cortex will be broken and torn, causing the overall structure to loosen. When the microwave power exceeds 640W, the grain will be charred, the oil cells will be over-matured, the structure will be too compact, and the oil yield will be reduced.

[0076] (2) Microwave time

[0077] Table 3 Determination results under different microwave time conditions

[0078]

[0079] As shown in Table 3, under the microwave conditions of microwave power 640W and microwave time of 10min and 15min, the average oil yield was not much different, and the oil yield of peony seeds was greatly improved compared with that of untreated peony seeds. In order to consider production time and production cost, the microwave conditions of microwave power 640W and microwave time 10min were selected for subsequent experiments.

[0080] This is because when the microwave time is short, the cell wall of the peony seed is not completely destroyed. As the microwave time increases, the pressure in the peony seed system continues to increase, and the cell wall breaks and releases the peony seed oil. When the microwave time is extended to more than 15 minutes, most of the oil in the peony seed has been extracted. At the same time, microwaves for too long will damage the active ingredients in the system.

[0081] 3. Proportion of soybean seed coat added

[0082] 100 g of peeled peony seeds were dried at 100° C. for 2 h, microwaved at a microwave power of 640 W for 10 min, and then soybean seed coats were added and mixed at a certain mass ratio.

[0083] The chamber pressure of the screw oil press is one of the important factors affecting the oil yield. The pressure in the chamber is generated by the compression of the oil due to the gradual reduction of the free volume in the chamber when the pressing shaft rotates; the greater the chamber pressure, the greater the deformation of the oil cells, and the easier it is for the oil to be discharged. Therefore, mixing a certain proportion of soybean seed coat into the unpressed peony kernel material can make it easier to form a dense space in the chamber, which can make it easier to generate strong pressure in the chamber, fully squeeze out the oil in the oil cells, and prolong the deformation period of the elastic-plastic deformation of the peony kernel, resulting in an increase in the oil output time and an increase in the oil output rate. In addition, the components such as lignin, cellulose and hemicellulose in the soybean seed coat play a key role in the peony kernel pressing process. These components help to form a physical channel for oil transport, making it easier for oil to flow out of the peony kernel. Compared with the densely compacted oil cake, the channel for oil outflow is smoother after adding soybean seed coat, thereby improving the oil extraction rate.

[0084] When the soybean seed coat content is too high (>20%), the bran discharge speed will be fast, the oil yield will be reduced accordingly, and the residual oil in the bran will increase. In addition, too high soybean seed coat content will increase the friction between the peony kernel and the press chamber, leading to an increase in oil temperature, which in turn causes an increase in peroxide value, affecting the quality of the oil.

[0085] Table 4 Determination results of different addition ratios of soybean seed husk

[0086]

[0087] As shown in Table 4, when the mass of the added soybean seed coat is 5% to 20% of the mass of the peony seeds, the average oil yield increases with the increase of the mass of the soybean seed coat, and when the mass of the added soybean seed coat is 25% to 30% of the mass of the peony seeds, the average oil yield decreases. Therefore, the condition with the highest average oil yield, that is, the mass of the added soybean seed coat is 20% of the mass of the peony seeds, is selected as the preferred technical solution.

[0088] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing peony seed oil by physically squeezing peony seeds, characterized in that: The steps include: The dried peony seeds are pretreated by microwave heating; Evenly mixing the microwave-heated dried peony seeds and soybean seed coats; Physically screw pressing the mixed dried peony seeds and soybean seed coats to obtain crude oil; The crude oil is centrifuged and filtered to obtain peony seed oil.

2. The method for preparing peony seed oil by physically squeezing peony seeds according to claim 1, characterized in that: The pre-processing comprises the following steps: Weighing peeled peony seeds and drying them to obtain the dried peony seeds; The moisture content of the dried peony seeds is less than 8%.

3. The method for preparing peony seed oil by physically squeezing peony seeds according to claim 2, characterized in that: The specific conditions of the drying are: drying temperature 60°C-100°C, and drying time 1h-3h.

4. The method for preparing peony seed oil by physically squeezing peony seeds according to claim 1, characterized in that: The specific conditions of microwave heating treatment are microwave power 320w-800w and microwave time 5-20min.

5. The method for preparing peony seed oil by physically squeezing peony seeds according to claim 1, characterized in that: The mass of the added soybean seed coat is 10-30% of the mass of the dry peony seeds.

6. The method for preparing peony seed oil by physically squeezing peony seeds according to claim 1, characterized in that: The pressing temperature is 180-220°C.

7. The method for preparing peony seed oil by physically squeezing peony seeds according to claim 1, characterized in that: The specific conditions of centrifugation are a centrifugal speed of 3000-4000 rpm and a centrifugal time of 10-20 min.

8. The method for preparing peony seed oil by physically squeezing peony seeds according to claim 1, characterized in that: The pretreatment further comprises: screening the soybean hull powder to a particle size of 3-4 mm.

9. Peony seed oil obtained by the method for preparing peony seed oil by physically squeezing peony seeds according to any one of claims 1 to 8.

10. Application of the preparation method according to any one of claims 1 to 8 in industrial production.

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