Preparation method of instant gracilaria agar with low freezing point

A low freezing point, instant technology, applied in the field of seaweed product processing, can solve problems such as the application limitation of agar, and achieve the effect of broadening the application field of products, improving yield, improving agar preparation technology and high-value utilization

Active Publication Date: 2015-08-12
FUJIAN PROVINCE LVQI FOOD COLLOID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional agar is insoluble in water at room temperature. Agar will absorb a lot of water and swell in cold water. It will become a colloidal solution after heat

Method used

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  • Preparation method of instant gracilaria agar with low freezing point

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Example Embodiment

[0027] Example 1

[0028] A method for preparing instant Gracilaria agar with a low freezing point, using Gracilaria as a raw material, removing salt and sand through a roller sieve, treating with alkali, acidifying and bleaching, boiling glue, coarsely filtering glue solution, cooling, treating with compound enzyme preparation, and heating for sterilization. Living, fine filtration, vacuum concentration, alcohol flocculation, solid-liquid separation, vacuum drying, pulverization, and sieving to obtain instant Gracilaria agar with low freezing point.

[0029] A preparation method of instant Gracilaria agar with low freezing point, comprising the following steps:

[0030] (1) Preparation of agar gel coarse filtration solution: Weigh 100 g of Grapefruit and sieve to remove salt and sand, add 2000 g of 8wt% NaOH solution, soak at 85 °C for 4 hours; then rinse with water to pH 7.5 , drain the water and add 2000g of 0.05wt% HCl and 0.10wt% NaClO 2 The mixed solution was acidified...

Example Embodiment

[0036] Example 2

[0037] A method for preparing instant Gracilaria agar with a low freezing point, using Gracilaria as a raw material, removing salt and sand through a roller sieve, treating with alkali, acidifying and bleaching, boiling glue, coarsely filtering glue solution, cooling, treating with compound enzyme preparation, and heating for sterilization. Living, fine filtration, vacuum concentration, alcohol flocculation, solid-liquid separation, vacuum drying, pulverization, and sieving to obtain instant Gracilaria agar with low freezing point.

[0038] A preparation method of instant Gracilaria agar with low freezing point, comprising the following steps:

[0039] (1) Preparation of agar gel coarse filtration solution: Weigh 100g of Grapefruit and remove salt and sand through a roller sieve, add 3000g of 8wt% NaOH solution, soak at 85°C for 4h; then rinse with water to pH 8.0 , drain the water and add 2500g of 0.05wt% HCl and 0.10wt% NaClO 2 The mixed solution was aci...

Example Embodiment

[0045] Example 3

[0046] A method for preparing instant Gracilaria agar with a low freezing point, using Gracilaria as a raw material, removing salt and sand through a roller sieve, treating with alkali, acidifying and bleaching, boiling glue, coarsely filtering glue solution, cooling, treating with compound enzyme preparation, and heating for sterilization. Living, fine filtration, vacuum concentration, alcohol flocculation, solid-liquid separation, vacuum drying, pulverization, and sieving to obtain instant Gracilaria agar with low freezing point.

[0047] A preparation method of instant Gracilaria agar with low freezing point, comprising the following steps:

[0048] (1) Preparation of agar gel coarse filtration solution: Weigh 1000kg of Grapefruit to remove salt and sand through a roller sieve, add 25M3 NaOH solution with a concentration of 8wt%, soak at 82°C for 4h; then rinse with water to pH 7.5 , drain the water and add 25M3 concentration of 0.05wt% HCl and 0.10wt% N...

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Abstract

The invention discloses a preparation method of an instant gracilaria agar with a low freezing point. The preparation method comprises the following steps: taking gracilaria as the raw material, removing the salt and sand from gracilaria by a roller, processing gracilaria by alkali, acidifying and bleaching the gracilaria, cooking gracilaria to obtain gel, crudely filtering the gel, cooling to a temperature of 55 DEG C to obtain an agar crudely-filtered solution; then processing the solution by a compound enzyme preparation, heating to inactivate the enzyme, carrying out fine filtration, condensing the solution under vacuum, adding alcohol into the solution to trigger flocculation, separating the solid from the liquid, drying the solid in vacuum, grinding the solid, and sieving so as to obtain the instant gracilaria agar with a low freezing point. In the agar crude filtration step, a compound enzyme preparation is added to process the gel solution so as to maximally degrade the alga fibers, and thus the enzyme preparation can be completely inactivated more easily. The alcohol is used to flocculate the gel solution, thus the safety and hygiene of the gracilaria agar can be guaranteed, and at the same time the yield of agar is increased. The technologies of diaphragm press filtration and vacuum drying can guarantee that alcohol is fully recycled and utilized. The freezing point of the prepared agar is not higher than 30 DEG C, the agar can be completely dissolved in 10 minutes at a temperature of 80 DEG C, the extraction yield is not less than 15.5%, the lead (Pb) content is not more than 0.5 mg/kg, the arsenic (As) content is not more than 0.3 mg/kg, and the total number of bacterium is not more than 1000 cfu/g.

Description

technical field [0001] The invention belongs to the technical field of seaweed product processing, and in particular relates to a preparation method of low freezing point instant gracilaria agar. Background technique [0002] Agar (agar) is from Geliflower ( Gelidium ) and Gracilaria ( Gracilaria ) and other marine red algae polysaccharide hydrocolloids are widely used in food industry, daily chemical industry, medical and biochemical fields. [0003] Conventional agar is insoluble in water at room temperature. Agar will absorb a lot of water and swell in cold water. It will become a colloidal solution after heating at 95-100°C. Resistant to the temperature at which agar dissolves, and biochemical analysis requires a low solidification temperature, which limits the application of agar. [0004] Aiming at common problems such as high freezing point and limited application of conventional agar, the present invention focuses on the research and development of the agar coars...

Claims

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Application Information

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IPC IPC(8): C08B37/12
Inventor 林坤城洪清林郭东煌张钟安
Owner FUJIAN PROVINCE LVQI FOOD COLLOID
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