A method for improving the gel strength of Gracilaria agar by using glutaraldehyde

A technology of gel strength and glutaraldehyde, applied in the field of gel production, can solve the problems of high energy consumption, small increase rate of gel strength, increase, etc., and achieve the effects of low energy consumption, low production cost, and easy reaction control.

Active Publication Date: 2016-01-13
GUANGDONG OCEAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There have been patented technical reports on methods for increasing the gel strength of agar, such as a production method for producing agar under high temperature and ultra-low concentration alkali pressurization (CN200410055565.6) and a method for increasing the gel strength of Gracilaria agar (CN201210380041.9) etc., which are respectively alkaline extraction method and enzyme treatment method. The maximum gel strength of the agar obtained by the alkaline extraction method is only the inherent strength of seaweed agar, and there are disadvantages such as environmental pollution and large energy consumption; Modified agar with glutaminase to obtain modified agar with greater than intrinsic strength, but the rate of increase in gel strength is small
There are also patent reports using glutaraldehyde to cross-link chitosan (CN200910100860.1) and other substances, but there is no report that glutaraldehyde is used to treat agar to improve its gel strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh 15g of agar powder and place it in a large beaker, add 1000mL of distilled water, and heat it in a water bath at 98°C for 25min until the agar is completely dissolved to obtain an agar solution with a concentration of 1.5%; then, at a water bath temperature of 45°C, Add hydrochloric acid catalyst, adjust the pH=4.5, add 0.15mL glutaraldehyde pure solution (the amount of glutaraldehyde is 1%, compared with the dry weight of agar powder), stir and react for 10min; Let stand at 25°C for 6 hours until it is completely gelled; finally, the gel strength of the modified agar is measured as 1120g / cm according to the method in the national standard GB1975-2010 2 , with unmodified agar (gel strength 850g / cm 2 ), the improvement rate is 31.7%.

Embodiment 2

[0015] Weigh 15g of agar powder and place it in a large beaker, add 1000mL of distilled water, and heat it in a water bath at 98°C for 30min until the agar is completely dissolved to obtain an agar solution with a concentration of 1.5%. Then, at a water bath temperature of 50°C, Add hydrochloric acid catalyst, adjust the pH=4.7, add 0.3mL glutaraldehyde pure solution (the amount of glutaraldehyde is 2%, compared with the dry weight of agar powder), stir and react for 14min; Let it stand at 26°C for 6.5 hours until it is completely gelled; finally, the gel strength of the modified agar is measured as 1410g / cm according to the method in the national standard GB1975-2010 2 , with unmodified agar (gel strength 850g / cm 2 ), the improvement rate is 65.9%.

Embodiment 3

[0017] Weigh 15g of agar powder and place it in a large beaker, add 1000mL of distilled water, and heat it in a water bath at 98°C for 35min until the agar is completely dissolved to obtain an agar solution with a concentration of 1.5%. Then, at a water bath temperature of 55°C, Add hydrochloric acid catalyst, adjust pH=5.0, add 0.45mL glutaraldehyde pure solution (the amount of glutaraldehyde is 3%, compared with the dry weight of agar powder), stir and react for 16min; Let stand at 27°C for 7 hours until it completely gels; finally, the gel strength of the modified agar is measured as 1785g / cm by referring to the method in the national standard GB1975-2010 2 , with unmodified agar (gel strength 850g / cm 2 ), the improvement rate is 110%.

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Abstract

The invention relates to a preparation method for improving the gel strength of Gracilaria agar by using glutaraldehyde, and belongs to the technical field of gel production. Agar with high gel strength is prepared by adding glutaraldehyde to the agar. The preparation method is to dissolve the powder of Gracilaria agar in hot water and configure it into an agar solution with a concentration of 1.5% (w / v). After boiling the glue for a certain period of time until it is completely dissolved, add hydrochloric acid catalyst at a certain range of temperature, add glutaraldehyde solutions of different concentrations, stir and react for several minutes, let it stand at room temperature to make the surface solidify, and then place it under constant temperature conditions. Gel for several hours, and measure its gel strength with reference to the method in the national standard GB1975-2010. The invention has the advantage that the gel strength of the Gracilaria agar is improved by a chemical modification method, and the obtained agar can be applied to the fields of daily chemical industry, bioengineering and the like, and has simple operation and low production cost.

Description

technical field [0001] The invention relates to a method for improving the gel strength of Gracilaria agar by using chemical reagents, in particular to a method for improving the gel strength of Gracilaria agar by using glutaraldehyde, by adding glutaraldehyde to the agar to improve the gel strength The improvement belongs to the technical field of gel production. Background technique [0002] Gracilaria agar is a high molecular polysaccharide extracted from red seaweed and mainly composed of galactose. It has good gelation and gel stability and is widely used in daily chemical industry and bioengineering. The gel strength of agar is an important index to measure the quality of agar. The higher the gel strength, the greater its application value. Most domestic agars are prepared by improving the process conditions of extracting agar from seaweed to prepare high-quality agar, but the improvement of gel strength is limited, and the maximum can only reach the inherent strength...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08L5/12C08K5/07
Inventor 李思东杨磊问莉莉胡章陈松赖伟才李秋婵
Owner GUANGDONG OCEAN UNIVERSITY
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