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Ultrasound-assisted preparation method of high strength Gracilaria agar

An ultrasonic and high-intensity technology, applied in the field of ultrasonic-assisted preparation of high-strength Gracilaria agar, can solve the problems of long production cycle, affecting product safety, and high acid consumption, reducing the loss of colloid, shortening the alkali treatment time, reducing The effect of acid dosage

Active Publication Date: 2013-03-13
FUJIAN PROVINCE LVQI FOOD COLLOID
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are three commonly used methods for the treatment of Gracilaria alkali: "low-temperature concentrated alkali method", "medium-temperature concentrated alkali method" and "high-temperature dilute alkali method". The common disadvantages of the first two methods are high alkali concentration, large consumption, and environmental pollution. Serious, long production cycle; "high temperature dilute alkali method" is currently the most commonly used method due to low alkali consumption and short production cycle, but due to high processing temperature, colloid is easy to enter the lye and be lost
[0004] Acidification and bleaching treatment is an essential link in the production process of extracting Gracilaria agar. In order to ensure the effect of acidification and bleaching, the amount of acid used in the current process is relatively high, which not only increases the production cost, but also has adverse effects on the gel strength of agar
[0005] Gracilaria is easy to accumulate heavy metal elements when growing in seawater. At present, there is no effective control method for removing heavy metals in the extraction process of Gracilaria agar, which affects the safety of the product.

Method used

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  • Ultrasound-assisted preparation method of high strength Gracilaria agar

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Experimental program
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Effect test

Embodiment 1

[0031] (1) Ultrasonic intermittently assisted medium-temperature and low-alkali treatment: Weigh 50g of Gracilaria and add 1000g of 6% NaOH solution, use 40kHz, 80W / kg ultrasonic wave to turn on the ultrasonic wave for 10min every 1h, treat at a constant temperature of 60°C for 3h, and rinse with water until The pH value of the cleaning solution is 7.5;

[0032] (2) Ultrasonic-assisted acidification: Weigh 50g of alkali-treated Gracilaria and add 1000g of it with a mass concentration of 0.03% (HCl: H 2 SO 4 =3:1) and 0.015% C 2 h 2 o 4 The mixed solution was acidified for 10 minutes at a constant temperature with the aid of 40kHz, 80W / kg ultrasonic waves;

[0033] (3) Ultrasonic-assisted bleaching and removal of heavy metals: Weigh 50g of acidified Gracilaria and add 1000g of NaClO (available chlorine 0.02%), 1.5% H 2 o 2 , 0.015% mixed solution of EDTA disodium, treated at a constant temperature with the assistance of 40kHz, 80W / kg ultrasonic waves for 10min, and then w...

Embodiment 2

[0036] (1) Ultrasonic intermittently assisted medium-temperature and low-alkali treatment: Weigh 50g of Gracilaria and add 1000g of 6% NaOH solution, use 40kHz, 80W / kg ultrasonic wave to turn on the ultrasonic wave for 10min every 1h, treat at a constant temperature of 60°C for 3h, and rinse with water until The pH value of the cleaning solution is 8;

[0037] (2) Ultrasonic-assisted acidification: Weigh 50g of alkali-treated Gracilaria and add 2000g of it with a mass concentration of 0.03% (HCl: H 2 SO 4 =3:1) and 0.015% C 2 h 2 o 4 The mixed solution was acidified for 10 minutes at a constant temperature with the aid of 40kHz, 80W / kg ultrasonic waves;

[0038] (3) Ultrasonic-assisted bleaching and removal of heavy metals: Weigh 50g of acidified Gracilaria and add 2000g of NaClO (available chlorine 0.02%), 1.5% H 2 o 2 , 0.015% mixed solution of EDTA disodium, treated at a constant temperature with the assistance of 40kHz, 80W / kg ultrasonic waves for 10min, and then was...

Embodiment 3

[0041] (1) Ultrasonic intermittently assisted medium-temperature and low-alkali treatment: Weigh 100g of Gracilaria and add 2000g of 6% NaOH solution, use 40kHz, 80W / kg ultrasonic wave to turn on the ultrasonic wave for 10min every 1h, treat at a constant temperature of 60°C for 3h, and rinse with water until The pH value of the cleaning solution is 8;

[0042] (2) Ultrasonic-assisted acidification: Weigh 50g of alkali-treated Gracilaria and add 500g of it with a mass concentration of 0.03% (HCl: H 2 SO 4 =3:1) and 0.015% C 2 h 2 o 4 The mixed solution was acidified for 10 minutes at a constant temperature with the aid of 40kHz, 80W / kg ultrasonic waves;

[0043] (3) Ultrasonic-assisted bleaching and removal of heavy metals: Weigh 50g of acidified Gracilaria and add 1000g of NaClO (available chlorine 0.02%), 1.5% H 2 o 2 , 0.015% mixed solution of EDTA disodium, treated at a constant temperature with the assistance of 40kHz, 80W / kg ultrasonic waves for 10min, and then was...

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Abstract

The invention discloses an ultrasound-assisted preparation method of high strength Gracilaria agar. The method includes: taking Gracilaria as the raw material, conducting intermediate-temperature low-alkaline treatment under intermittent assistance of ultrasound, ultrasound-assisted acidification, ultrasound-assisted bleaching and heavy metal removal, carrying out gel boiling, filtering out impurities, performing cooling, extruding gel, conducting dehydration, drying, and smashing, and then passing the product through a 80-mesh sieve, thus obtaining the high strength Gracilaria agar. The invention adopts intermediate-temperature dilute alkaline treatment on Gracilaria, with NaOH assisted by ultrasound intermittently, so that the alkaline treatment time is shortened, and simultaneously gel loss can be substantially reduced. Ultrasound is employed to assist acidification of a mixed solution of HCl, H2SO4, and C2H2O4, so that the acid consumption is substantially reduced, and the action time is short. Ultrasound is adopted to assist a mixed solution of NaClO, H2O2, and EDTA-Na2 to realize efficient bleaching, and at the same time, heavy metals are removed from the raw material, so that product color and hygienic quality are guaranteed. The method provided in the invention makes use of ultrasound to assist preparation of Gracilaria agar having high strength, good color, and excellent security, and is of great significance in enhancing the technical level of agar preparation and improving product comprehensive quality.

Description

technical field [0001] The invention belongs to the technical field of seaweed product processing, and in particular relates to a method for preparing high-strength Gracilaria agar with the assistance of ultrasonic waves. Background technique [0002] Agar is a natural polysaccharide colloid extracted from red algae seaweed. Agar, carrageenan and alginate are the three most widely used alginate in the world. Agar has excellent gelling, thickening and stabilizing properties, and can be used as a thickener, coagulant, suspending agent, emulsifier, stabilizer, preservative, adhesive, biological medium and microbial carrier, and is widely used in food , daily chemical industry, light industry, medicine and other fields. Agar itself belongs to the marine natural polysaccharide substance, which contains more than ten kinds of beneficial mineral elements, polysaccharides and dietary fiber necessary for the human body. In addition, agar can be further made into agarose, which is ...

Claims

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Application Information

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IPC IPC(8): C08B37/12
Inventor 林坤城郭东旭郭东煌张钟安
Owner FUJIAN PROVINCE LVQI FOOD COLLOID
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