Extraction process of peel oil and preparation method of NFC (Near Field Communication) citrus juice rich in peel oil

Abstract

The invention relates to a peel oil extraction process and a preparation method of NFC citrus juice rich in peel oil. The peel oil extraction process comprises the following steps: a pretreatment process: harvesting, accepting, cleaning and selecting oranges; a peel grinding process: the selected oranges enter a peel grinding machine to pierce peel so that peel oil in peel bags flows out, and high-concentration peel oil is enriched in fruit juice in a temporary storage tank through cyclic extraction; and disc centrifugation: further removing impurities from the juice rich in the peel oil in the temporary storage tank through a disc centrifuge, and improving the purity of the peel oil. According to the preparation method, the peel grinding process is adopted, a peel grinding machine is adopted to pierce the peel bag of the orange peel so as to separate out peel oil, the peel oil is enriched by using NFC fruit juice, then the peel oil is backfilled into juice obtained by juicing according to a certain proportion in the subsequent blending process, and HPP (ultrahigh pressure sterilization treatment) is adopted for sterilization, so that the freshly squeezed high-peel-oil NFC fruit juice is finally formed. Excessive enrichment of bitter substances caused by direct physical squeezing is avoided, and the overall flavor of fruit juice is improved in cooperation with a cold sterilization mode.

Description

Technical Field

[0001] The invention relates to the technical field of fruit juice preparation, and in particular to a peel oil extraction process and a method for preparing NFC citrus juice rich in peel oil. Background Art

[0002] Citrus is a general term for tangerines, mandarins, oranges, lemons, kumquats, grapefruits, and trifoliate oranges. Taking sweet oranges as an example, the peel oil of oranges is rich in hesperidin, volatile oil (limonene) and other ingredients, which are the main source of orange aroma, while the white flesh between the orange peel and the pulp is the source of bitter substances.

[0003] In the prior art, the peel oil is mainly extracted by using a citrus peeler, which peels the peel layer by layer with a wheel-shaped blade, collects the peel and the white flesh separately, and then only takes the peel part and passes it through a screw press to squeeze out the peel oil in the peel bag. However, the wheel-shaped blade cannot completely remove the white flesh on the peel, so the peel still contains a certain proportion of bitter substances when it is squeezed.

[0004] In the juicing process of the currently mature NFC orange juice preparation process, in order to avoid the bitter substances in the orange peel from being squeezed out too much and brought into the orange juice, the orange juice is often prepared by removing the peel first and then squeezing the pulp to extract the orange juice. The removed orange peel is used as a by-product as fertilizer or recycled by downstream manufacturers as a raw material for extracting pectin and essential oils. If it is necessary to increase the flavor substances in orange juice, it is necessary to consider how to enrich the orange peel oil and avoid the addition of too many bitter substances.

[0005] In addition, the main sterilization process for the preparation of existing NFC orange juice is pasteurization technology. Due to the stability of the water-soluble flavor of citrus fruits, pasteurization has an acceptable impact on the flavor of NFC orange juice products that do not contain orange peel oil. However, if the juice contains a high concentration of peel oil components, the overall flavor of the product after heat sterilization is slightly improved due to the heat sensitivity of the peel oil. Summary of the invention

[0006] The first object of the present invention is to provide a leather oil extraction process, which adopts a room temperature extraction scheme to greatly retain the freshness of the leather oil.

[0007] The second object of the present invention is to provide a method for preparing NFC citrus juice rich in peel oil, wherein the juice prepared by the preparation method does not contain bitter substances in the white pulp part, thereby greatly improving the flavor of the NFC citrus juice.

[0008] The first object of the present invention is achieved by the following technical solutions:

[0009] A leather oil extraction process comprises the following steps:

[0010] Pre-treatment process: citrus harvesting, inspection, cleaning and selection, and bubbling cleaning process to remove dirt, wax and other impurities on the surface of citrus;

[0011] Peeling process: the selected citrus fruits enter the peeling machine. In the peeling machine, the rotation of the roller drives the citrus fruits to roll forward, and the small needles on the roller pierce the peel, causing the peel oil in the peel to flow out; and the spray head arranged above the peeling machine sprays the NFC juice in the temporary storage tank evenly on the citrus fruits, and the juice washes the citrus peel oil to the bottom of the peeling machine and returns to the temporary storage tank together. After multiple spraying cycles, the peel oil is gradually enriched in the juice in the temporary storage tank with a high concentration; in this step, by controlling the amount of citrus fruits entering the peeling machine and the time of the juice circulation spraying, it can be ensured that the concentration of peel oil in each batch of peel oil-rich juice is within a relatively stable range; at the same time, the content of peel oil in each batch of peel oil-rich juice obtained is confirmed through quantitative detection of crude fat.

[0012] Disc centrifugation: The juice rich in peel oil in the temporary storage tank contains many small, broken peels and other impurities. The disc centrifuge further removes impurities and improves the purity of the peel oil. At this point, the extraction of peel oil is achieved.

[0013] The second object of the present invention is achieved through the following technical solutions:

[0014] A method for preparing NFC citrus juice rich in peel oil comprises the following steps:

[0015] Peel oil extraction: Extract citrus peel oil as described above;

[0016] Juicing: After the peeling process, the citrus fruits are peeled and the white pulp is removed, and then put into the juicer to complete the juicing process;

[0017] Fine filtration: The juice passes through a double fine filtration device to remove the suspended fruit puree and larger particles of seeds, fibers, etc. in the juice, and then the juice enters the blending tank;

[0018] Blending: In the blending tank, citrus peel oil and finely filtered juice are mixed in proportion to complete the preparation of NFC citrus juice rich in peel oil;

[0019] In addition, it also includes filling and sterilization, among which sterilization adopts HPP: ultra-high pressure sterilization technology. The cold sterilization method can ensure to the greatest extent that the aroma substances in the leather oil do not volatilize.

[0020] Furthermore, commercial production may also include steps such as quick freezing, storage and shipping.

[0021] The present invention uses a peel grinding process before the juicing process. The peel grinding machine punctures the skin capsule of the citrus epidermis to precipitate the skin oil, collects the juice rich in skin oil through cyclic spraying, removes impurities, and then fills it back into the juice obtained by juicing in a certain proportion in the subsequent blending process. After HPP (ultra-high pressure sterilization treatment) sterilization, high-skin oil fresh-squeezed NFC juice is finally formed. The present invention avoids excessive enrichment of bitter substances caused by direct physical squeezing, and improves the overall flavor of the juice in combination with the cold sterilization method.

[0022] Juice rich in skin oil has a high concentration of aroma substances, which is suitable for use in the preparation of fruit juice drinks and can replace the use of edible flavors. Skin oil is a natural substance, and its aroma is more natural and fresh, which has significant advantages. Compared with traditional heat sterilization technology, the HPP cold sterilization technology used has a better protection effect on the aroma components in heat-sensitive skin oil, which will not be decomposed or volatilized by heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a flow chart of the preparation of NFC orange juice rich in skin oil. DETAILED DESCRIPTION

[0024] In order to make the technical personnel in the field understand the present invention more clearly and intuitively, the present invention will be further described below in conjunction with the accompanying drawings. The experimental methods without specific conditions in the following examples are selected according to conventional methods and conditions, or according to the product instructions.

[0025] Example 1

[0026] This embodiment is described using the extraction of orange peel oil as a case.

[0027] A process for extracting orange peel oil comprises the following steps:

[0028] Pre-treatment process: orange harvesting, acceptance, storage, cleaning and selection. Cleaning is a bubbling cleaning process to remove impurities such as dirt and wax on the surface of the oranges;

[0029] Peeling process: at room temperature, the selected oranges enter the peeling machine, in which the rotation of the short-pin roller drives the oranges to roll forward, and the dense short needles on the short-pin roller pierce the orange peel, so that the orange peel oil in the peel bag flows out; and the spray head arranged above the peeling machine sprays the NFC orange juice added in advance in the temporary storage tank evenly on the oranges, and the orange juice washes the orange peel oil flowing out of the orange peel to the bottom of the peeling machine and returns to the temporary storage tank together, and gradually enriches the high-concentration orange peel oil in the orange juice in the temporary storage tank after multiple spraying cycles; in this step, according to needs, the amount of oranges entering the peeling machine and the time of the orange juice cyclic spraying can be controlled to ensure that the concentration of orange peel oil in each batch of orange juice rich in orange peel oil is within a fixed range; at the same time, the content of orange peel oil in each batch of orange juice rich in orange peel oil is confirmed through quantitative detection of crude fat. When the oranges are rolled on the short-needle roller, the short needles penetrate the oil sacs on the orange peel due to gravity and the squeezing force between the oranges, which causes the orange peel oil to precipitate without damaging the main internal structure of the orange peel. The length of the short needles should not be too long, so as not to pierce the white flesh and bring out bitter substances.

[0030] Disc centrifugation: The orange juice rich in orange peel oil in the temporary storage tank contains many small, broken orange peels and other impurities. The disc centrifuge further removes the impurities and improves the purity of the orange peel oil. At this point, the extraction of orange peel oil is achieved.

[0031] In this embodiment, before the juicing process, a peel grinding process is performed, in which a peel grinding machine punctures the skin sacs of the orange peel to precipitate the orange peel oil, and then the orange juice rich in orange peel oil is collected through cyclic spraying, and then impurities (tiny orange peels, orange pulp) are removed to obtain the orange juice. In the subsequent blending process, the orange peel oil is backfilled into the orange juice obtained by juicing according to a certain proportion, and then sterilized by HPP (ultra-high pressure sterilization treatment) to finally form freshly squeezed NFC orange juice with high orange peel oil.

[0032] Example 2

[0033] A method for preparing NFC orange juice rich in orange peel oil in this embodiment comprises the following steps (the preparation flow chart is shown in FIG. Figure 1 shown):

[0034] Extract orange peel oil according to the method of Example 1;

[0035] Juicing: After the peeling process, the oranges are peeled and the white pulp is removed, and then put into the juicer to complete the juicing process;

[0036] Fine filtration: The orange juice passes through a double fine filtration device to remove the suspended fruit pulp and larger particles of seeds and fibers in the orange juice, and then the orange juice enters the blending tank;

[0037] Blending: In a blending tank, orange peel oil and finely filtered orange juice are mixed in proportion to complete the preparation of NFC orange juice rich in orange peel oil;

[0038] In addition, it also includes filling and sterilization, among which sterilization adopts HPP: ultra-high pressure sterilization technology. The cold sterilization method can ensure to the greatest extent that the aroma substances in the leather oil do not volatilize.

[0039] Commercial production may also include steps such as quick freezing, storage and shipping.

[0040] In this embodiment, orange juice rich in orange peel oil has a high concentration of aroma substances, is suitable for use in the preparation of fruit juice beverages, and can replace the use of edible flavors. In addition, orange peel oil is a natural substance, and its aroma is more natural and fresh, which has significant advantages. Compared with traditional heat sterilization technology, the HPP cold sterilization technology used has a better protective effect on the aroma components in heat-sensitive orange peel oil, which will not be decomposed or volatilized by heat; therefore, this method avoids excessive enrichment of bitter substances caused by direct physical squeezing, and improves the overall flavor of orange juice in combination with the cold sterilization method.

[0041] The above description of the embodiments is to facilitate the understanding and application of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the embodiments herein, and improvements and modifications made to the present invention by those skilled in the art based on the disclosure of the present invention should be within the scope of protection of the present invention.

Claims

1. A leather oil extraction process, characterized in that: The steps include: Pre-processing steps: citrus harvesting, acceptance, cleaning and selection; Peeling process: The selected citrus fruits enter the peeling machine, which pierces the peel to make the peel oil in the peel sac flow out, and the spray head installed above the peeling machine sprays the juice in the temporary storage tank evenly on the citrus fruits. The juice washes the citrus peel oil to the bottom of the peeling machine and returns to the temporary storage tank together. After multiple spraying cycles, the peel oil is gradually enriched in the juice in the temporary storage tank. Disc centrifugation: The juice rich in leather oil in the temporary storage tank is further removed from the impurities by a disc centrifuge to improve the purity of the leather oil.

2. A leather oil extraction process as claimed in claim 1, characterized in that: Control the amount of citrus entering the peeling machine and the time of juice circulation spraying to adjust the concentration of peel oil in the juice rich in peel oil.

3. A leather oil extraction process as claimed in claim 1, characterized in that: The citrus fruits include any one or more of tangerine, mandarin orange, orange, lemon, kumquat, pomelo and trifoliate orange.

4. Juice rich in skin oil obtained by the skin oil extraction process as claimed in claim 1, 2 or 3.

5. Use of the juice rich in peel oil obtained by the peel oil extraction process as claimed in claim 1, 2 or 3 as a natural aroma additive in the preparation of NFC citrus juice.

6. A method for preparing NFC citrus juice rich in peel oil, characterized in that: The steps include: Peel oil extraction: extracting citrus peel oil according to the peel oil extraction process of claim 1, 2 or 3; Juicing: After the peeling process, the citrus fruits are peeled and the white pulp is removed, and then put into the juicer to complete the juicing process; Fine filtration: Fine filtration removes the fruit puree and larger particles of seeds and fibers suspended in the juice, and then the juice enters the blending tank; Blending: In the blending tank, citrus peel oil is mixed with the filtered juice in proportion to prepare NFC citrus juice rich in peel oil.

7. The method for preparing NFC citrus juice rich in skin oil according to claim 6, characterized in that: The prepared NFC citrus juice rich in skin oil also includes filling and sterilization steps; Among them, sterilization adopts HPP: ultra-high pressure sterilization technology.

8. The method for preparing NFC citrus juice rich in skin oil according to claim 7, characterized in that: It also includes quick freezing, storage and shipping steps.

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