Method for preparing agar with low sulfate radical content
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A technology of sulfate and agar, which is applied in the field of preparation of agar with low sulfate content, can solve the problems of reduced sulfate and unclear forms of sulfate, and achieve the effect of low sulfate content and easy operation
Active Publication Date: 2016-04-20
FUJIAN PROVINCE LVQI FOOD COLLOID
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Problems solved by technology
However, due to the unclear form of sulfate radicals in Gracilaria agar, it is still difficult to reduce the sulfate radicals in Gracilaria agar to the same level as abroad
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Embodiment 1
[0022] A preparation method of agar with low sulfate content, comprising the following steps:
[0023] Step 1. Add 250 mL of 4% NaOH solution to 10 g of agar powder.
[0024] Step 2: bathe in water at 60°C and 80°C for 10 hours respectively.
[0025] Step 3: washing with water until neutral, drying at 55°C until constant weight and pulverizing.
[0026] In this example, the sulfate radical contents in the extraction agar were 0.40% and 0.44%, which were respectively reduced by 20% and 12% compared with the raw material agar (0.5%).
Embodiment 2
[0028] A preparation method of agar with low sulfate content, comprising the following steps:
[0029] Step 1. Add 6.5g / L of EDTA-Na to 15g of agar powder 2 The solution was 250 mL, the pH was adjusted to 9, and the reaction was carried out at 60° C. for 4 h.
[0030] Step 2: After washing with water, dry at 55°C until constant weight and pulverize.
[0031] In this example, the sulfate radical content in the extracted agar is 0.25%, which is 50% lower than that of the raw agar (0.5%).
Embodiment 3
[0033] A preparation method of agar with low sulfate content, comprising the following steps:
[0034] Step 1. Add 250 mL of distilled water to dissolve 7 g of agar powder, and keep it warm at 60°C.
[0035] Step 2, add EDTA-Na in the glue solution mentioned in step 1 2 The solution was 100 mL, adjusted to pH 9, and reacted at 60° C. for 2 h.
[0036] Step 3: After the reaction is finished, wait for the glue to solidify, freeze in the refrigerator, then thaw in a warm water bath, wash, dry and pulverize to obtain the agar product.
[0037] In this embodiment, the sulfate radical content in the extracted agar is 0.35%, which is 30% lower than that of the raw agar (0.5%).
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Abstract
The invention discloses a method for preparing agar with low sulfate radical content. The method comprises the following steps: 1, alkali treatment, namely adding a NaOH solution into agar, conducting a water bath for 2-10 hours at 50-90 DEG C, and washing to be neutral with water; 2, cation exchange resin treatment, namely dissolving with water, adding cation exchange resin into the agar liquid, reacting for 5-60 minutes at 50-80 DEG C, filtering and removing resin with nylon cloth after the reaction is completed to obtain an agar solution; 3, EDTA-Na2 treatment, namely adding an EDTA-Na2 solution having a concentration of 5-7g / L into the agar solution prepared in the step 2, regulating the pH to be 8-10, and reacting for 1-4 hours at 50-70 DEG C; and 4, washing and drying, namely freezing the agar solution in a refrigerator after the reaction is completed and the agar solution is solidified, unfreezing in a warm water bath, washing, drying and grinding to obtain an agar product with low sulfate radical content. Compared with a traditional method, the method has the advantages of low raw material cost, low sulfate radical content in the agar product, no complicated equipment and simple operation.
Description
technical field [0001] The invention relates to the technical field of chemical reagents, in particular to a method for preparing agar with low sulfate content. Background technique [0002] Agar (Agar) is a polysaccharide extracted from red algae, which contains two components of agarose and agar ester, in which agarose is composed of 1,3-linked β-D-galactose and 1,4-linked 3 , a neutral polysaccharide in which 6-endether-ɑ-L-galactose is alternately combined, the molecular formula is [C 12 h 14 o 5 (OH) 4 ] n . After the agarose is heated and dissolved, the molecules are distributed in random coils. When the temperature is lowered, the hydroxyl groups on the sugar molecules are connected by hydrogen bonds to form a pore-like structure, which makes it have the properties of a gel. The structure of agar ester is relatively complex, mainly including various substituents such as β-D-galactose, α-3,6-inside ether-L-galactose anhydride, galacturonic acid, pyruvic acid, sul...
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