A method for controlling acid value and peroxide value in the production process of salt algae powder

Abstract

The present invention discloses a method for controlling acid value and peroxide value in the production process of salt algae powder, which comprises the following steps in sequence: (1) harvesting; (2) primary flocculation separation; (3) dilution; (4) secondary flocculation separation; (5) drying and crushing. Beneficial effect: The present invention provides a method for controlling acid value and peroxide value in the production process of salt algae powder, which uses two alcohol flocculation elutions and vacuum drying to control acid value and peroxide value, thereby ensuring the quality of salt algae powder products.

Description

Technical field:

[0001] The patent of this invention relates to the technical field of processing of salt algae powder, and specifically to a method for controlling acid value and peroxide value in the production process of salt algae powder. Background technology:

[0002] Dunaliella has been approved by the state as a new resource food and is currently mainly used as a raw material for food and health food. In order to provide consumers with safe and high-quality Dunaliella, the national standardization management department has formulated relevant national standards for Dunaliella powder, and stipulated the detection methods of Dunaliella and its related quality indicators. Among them, acid value and peroxide value are two important indicators of the quality of Dunaliella powder. Acid value and peroxide value are both indicators that describe the rancidity of oils. The lower the acid value, the better the quality of the oil, the fresher it is and the better the degree of refining. The higher the peroxide value, the higher the food has been oxidized and spoiled.

[0003] At present, the process of harvesting and processing salt algae powder is to first harvest the algae paste by centrifugation, then flocculate and settle the salt algae with acid, and finally spray dry. The addition of acid during this period will cause the acid value of the salt algae powder to increase when tested. During the above processing, the salt algae is in contact with the air for a long time, and the temperature is high during spray drying, which makes the salt algae powder very easy to be oxidized, resulting in an increase in its peroxide value and acid value, thus affecting the quality of the salt algae powder. Summary of the invention:

[0004] The object of the present invention is to provide a method for simply and effectively reducing and controlling the acid value and peroxide value in the production process of Dunaliella powder.

[0005] The purpose of the present invention is implemented by the following technical scheme: a method for controlling acid value and peroxide value in the production process of salt algae powder, which comprises the following steps in sequence:

[0006] (1) Harvesting: The cultivated salt algae are continuously harvested by a centrifuge to obtain primary algae paste;

[0007] (2) primary flocculation separation: mixing the primary algae paste obtained in step (1) with alcohol, and then allowing it to stand for at least 10 minutes and then dehydrating it by centrifuge to obtain primary salt algae mud;

[0008] (3) dilution: mixing the primary salt algae mud obtained in step (2) with fresh water, and stirring them thoroughly to obtain an algae liquid;

[0009] (4) Secondary flocculation separation: the algae liquid obtained in step (3) is mixed with alcohol, and then the supernatant is removed after standing for at least 1 hour, and the remaining part is dehydrated by a centrifuge or a filter press to obtain secondary salt algae mud;

[0010] (5) Drying and crushing: The secondary Dunaliella mud obtained in step (4) is sent to a vacuum drying oven for drying to obtain Dunaliella blocks with a moisture content of less than 10%, and then crushed in a sterile environment to obtain Dunaliella powder.

[0011] Furthermore, the alcohol concentration in the mixed solution after the algae paste and alcohol are mixed in step (2) is not less than 15%.

[0012] Furthermore, the salinity of the algae liquid obtained in step (3) is less than 2 degrees Baume.

[0013] Furthermore, in step (4), the alcohol concentration in the mixed solution after the algae liquid and alcohol are mixed is not less than 10%.

[0014] Furthermore, the drying conditions in step (5) are: the drying temperature is lower than 100° C., and the vacuum pressure is lower than -0.06 MPa.

[0015] Advantages of the present invention:

[0016] 1. The present invention provides a method for controlling acid value and peroxide value in the production process of salt algae powder, using alcohol instead of acid to make the salt algae flocculate and settle, thereby playing a role in controlling the acid value.

[0017] 2. The present invention provides a method for controlling acid value and peroxide value in the production process of salt algae powder. Alcohol dissolves harmful substances such as aldehydes and ketones that have been oxidized in the salt algae, and then the dissolved harmful substances are separated out. At the same time, vacuum drying is adopted to avoid long-term contact with air, further reducing the oxidation of the salt algae powder, thereby controlling its peroxide value and acid value and ensuring the quality of the product. Specific implementation method:

[0018] The present invention will be further described in detail below by way of examples.

[0019] Example 1: A method for controlling acid value and peroxide value during the production of Dunaliella powder, comprising the following steps in sequence:

[0020] (1) Harvesting: The cultivated salt algae are continuously harvested by a centrifuge to obtain primary algae paste.

[0021] (2) Primary flocculation separation: The primary algae paste obtained in step (1) is mixed with alcohol, wherein the alcohol concentration in the mixed solution is 19%, and then allowed to stand for 30 minutes and then dehydrated by a centrifuge to obtain primary salt algae mud.

[0022] (3) Dilution: Mix the primary salt algae mud obtained in step (2) with fresh water, and stir thoroughly to obtain an algae liquid, wherein the salinity of the algae liquid is less than 2 degrees Baume.

[0023] (4) Secondary flocculation separation: the algae liquid obtained in step (3) is mixed with alcohol, wherein the alcohol concentration in the mixed liquid is 13.6%, and then the supernatant is removed after standing for 1 hour, and the remaining part is dehydrated by a centrifuge or a filter press to obtain secondary salt algae mud;

[0024] (5) Drying and crushing: The secondary salt algae mud obtained in step (4) is sent to a vacuum drying oven for drying to obtain salt algae blocks with a moisture content of 6%, and then crushed in a sterile environment to obtain salt algae powder; wherein the drying conditions are: drying temperature 90-100°C, vacuum pressure of -0.066Mpa.

[0025] Embodiment 2: A method for controlling acid value and peroxide value in the production process of Dunaliella powder, which comprises the following steps in sequence:

[0026] (1) Harvesting: The cultivated salt algae are continuously harvested by a centrifuge to obtain primary algae paste.

[0027] (2) Primary flocculation separation: The primary algae paste obtained in step (1) is mixed with alcohol, wherein the alcohol concentration in the mixed solution is 23.8%, and then allowed to stand for 30 minutes and then dehydrated by a centrifuge to obtain primary salt algae mud.

[0028] (3) Dilution: Mix the primary salt algae mud obtained in step (2) with fresh water, and stir thoroughly to obtain an algae liquid, wherein the salinity of the algae liquid is less than 2 degrees Baume.

[0029] (4) Secondary flocculation separation: the algae liquid obtained in step (3) is mixed with alcohol, wherein the alcohol concentration in the mixed liquid is 15.9%, and then the supernatant is removed after standing for 1 hour, and the remaining part is dehydrated by a centrifuge or a filter press to obtain secondary salt algae mud;

[0030] (5) Drying and crushing: The secondary salt algae mud obtained in step (4) is sent to a vacuum drying oven for drying to obtain salt algae blocks with a moisture content of 6.8%, and then crushed in a sterile environment to obtain salt algae powder; wherein the drying conditions are: drying temperature 50-60°C, vacuum pressure of -0.066Mpa.

[0031] Example 3: The overall method steps are the same as those of Example 2, except that, in step (5), the secondary salt algae mud obtained in step (4) is spray-dried to obtain salt algae powder.

[0032] Comparative Example 1: First, the cultivated salt algae are continuously harvested through a centrifuge to obtain a primary algae paste, fresh water is added to the primary algae paste to dilute it to a salinity of less than 2 degrees Baume, and then hydrochloric acid is added for flocculation. The pH value of the solution is maintained at 3-4, and then the supernatant is removed after standing for 10 hours. The remaining part is dehydrated through a centrifuge or a filter press to obtain algae mud, and the algae mud is spray-dried to obtain salt algae powder.

[0033] The acid value, peroxide value and β-carotene content of the salt algae powder prepared in Examples 1-3 and Comparative Example 1 were tested using the national standards "GB5009.229-2016" and "GB5009.227-2016". The specific test results are shown in the table below.

[0034] Acid value Peroxide value Beta-carotene Comparative Example 1 17.25mg / g 7.951mmol / kg 4.95％ Example 1 5.78mg / g 5.226mmol / kg 5.15％ Example 2 5.81mg / g 2.502mmol / kg 5.14％ Example 3 8.09mg / g 6.856mmol / kg 5.01％

[0035] It can be seen from the above table that the acid value and peroxide value of Example 1 and Example 2 are significantly lower than those of Comparative Example 1. The method disclosed in the present invention has a good control effect on the acid value and peroxide value in Dunaliella powder.

[0036] At the same time, it can be seen from the above table that the peroxide value and acid value of Example 3 are significantly higher than those of Example 2. Therefore, it can be seen that the use of a vacuum dryer and crushing in a sterile environment play an important role in reducing the peroxide value and acid value of Dunaliella powder.

[0037] The above are preferred embodiments of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for controlling acid value and peroxide value in the production process of Dunaliella salina powder, characterized in that: It includes the following steps in sequence: (1) Harvesting: The cultivated salt algae are continuously harvested by a centrifuge to obtain primary algae paste; (2) primary flocculation separation: mixing the primary algae paste obtained in step (1) with alcohol, allowing the mixture to stand for at least 10 minutes and then dehydrating the mixture by centrifuge to obtain primary salt algae mud; the alcohol concentration in the mixture after the primary algae paste and alcohol are mixed is not less than 15%; (3) dilution: mixing the primary salt algae mud obtained in step (2) with fresh water, and stirring them thoroughly to obtain an algae liquid; (4) Secondary flocculation separation: the algae liquid obtained in step (3) is mixed with alcohol, and then the supernatant is removed after standing for at least 1 hour, and the remaining part is dehydrated by a centrifuge or a filter press to obtain secondary salt algae mud; the alcohol concentration in the mixed liquid after the algae liquid and alcohol are mixed is not less than 10%; (5) Drying and crushing: The secondary salt algae mud obtained in step (4) is sent to a vacuum drying oven for drying to obtain salt algae blocks with a moisture content of less than 10%, and then crushed in a sterile environment to obtain salt algae powder; wherein the drying conditions are: the drying temperature is lower than 100°C and the vacuum pressure is less than -0.06Mpa.

2. The method for controlling acid value and peroxide value in the production process of Dunaliella salina powder according to claim 1, characterized in that: The salinity of the algae liquid obtained in step (3) is less than 2 degrees Baume.