Method for extracting agar from fresh Asparagus schoberioides
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A technology of asparagus and agar, which is applied in the field of extracting agar from fresh asparagus, can solve the problems of low extraction rate, achieve the effects of increasing extraction rate, significant economic benefits, and improving whiteness
Inactive Publication Date: 2021-03-02
青岛聚大洋藻业集团有限公司
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Problems solved by technology
[0004] Although the above-mentioned prior art extracts agar from asparagus, it has defects such as low extraction rate.
Method used
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Embodiment 1
[0070] A method for extracting agar from fresh asparagus, comprising the following steps in turn:
[0072] Use fresh asparagus as a raw material, wash it with water, add 6 times the amount of fresh asparagus, cut it into small pieces of 20-30cm, then dehydrate, pump it into the vegetable washing tank Skein cage net for dehydration;
[0073] S2, alkali treatment, washing
[0074] Put the fresh asparagus obtained after dehydration in step S1 into an alkali treatment tank, and add a sodium hydroxide solution with a mass fraction of 8% into the alkali treatment tank, and heat up to 70° C. for alkali treatment for 3 hours; The purpose of alkaline treatment is to remove SO 4 2- , pigments, proteins, etc., after the alkali treatment, add 6 times the amount of vegetables to the tap water for washing, wash 5 to 6 times, each time about 2 hours, until the pH is neutral after 2 hours of leaching water;
[0075] S3, acid treatment...
Embodiment 2
[0092] The difference from Example 1 is that in the coarse filtration in step S7, the weight ratio of the slow filter aid perlite and diatomaceous earth is 7:3.
Embodiment 3
[0094] The difference from Example 1 is that in the coarse filtration in step S7, the weight ratio of the slow filter aid perlite and diatomaceous earth is 8:2.
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Abstract
The invention discloses a method for extracting agar from fresh Asparagus schoberioides, and belongs to the technical field of agar extraction. The method comprises the following steps: taking fresh Asparagus schoberioides as a raw material, carrying out water washing, vegetable cutting and dehydration steps, then carrying out alkali treatment and water washing steps, and carrying out acid treatment and water washing on the Asparagus schoberioides which is washed to be neutral; adding sodium hypochlorite into the water-washed Asparagus schoberioides for bleaching, and then conducting washing with water; adding an organic acid into the water-washed Asparagus schoberioides , adjusting the pH value of the Asparagus schoberioides to 5.5, carrying out acid pickling treatment for 55 minutes, washing the Asparagus schoberioides with water after acid pickling and decolorizing, and soaking and rinsing the Asparagus schoberioides with water after the Asparagus schoberioides is washed to be neutral; and then sequentially carrying out extraction, rough filtration, fine filtration, cooling, diaphragm plate frame dehydration, crushing granulation, sterilization, drying, crushing and grinding, detection and metering to obtain agar. According to the method, the agar extraction rate can be remarkably increased, the product whiteness reaches 70 degrees or above, the purity is 83% or above, and the method is environmentally friendly, free of pollution and capable of being applied and popularized.
Description
technical field [0001] The invention belongs to the technical field of agar extraction, and in particular relates to a method for extracting agar from fresh asparagus. Background technique [0002] Asparagus is mainly distributed in Shandong, Fujian, Jiangsu, Guangdong, Zhejiang and other provinces in my country. The algae grow fast, especially in spring and autumn, and are suitable for large-scale farming. At present, asparagus is mainly used as raw material for the production of agar and agarose, or as feed for abalone, and can also be eaten directly. Relevant scholars have done research on the composition of asparagus algae, and the main components are carbohydrates . [0003] Agar is the most important sugar substance. According to relevant research reports in the prior art, asparagus is used to extract agar, such as application number 200710059966.2, which discloses a method for simultaneously extracting phycoerythrin and agar from gum-containing seaweed such as aspara...
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