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Method for extracting natural low-ester pectin from sunflower heads

A technology of sunflower plate and low-ester pectin, which is applied in the field of preparation of natural low-ester pectin, can solve the problems of high energy consumption for recycling, high consumption of ethanol, and increased pectin post-processing costs and safety risks, achieving high safety, The effect of simple process

Active Publication Date: 2014-11-19
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, chelating agents such as disodium EDTA, phosphate, and ammonium oxalate are often added to the acid extraction to assist the extraction, but this will increase the cost of pectin post-processing and cause safety risks; the ethanol precipitation process consumes a large amount of ethanol, resulting in recovery energy. Problems such as large consumption and high cost of environmental protection treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Water washing: add 20 g of sunflower pan powder passed through a 60-mesh sieve to 400 mL of deionized water at room temperature, stir at 100 rpm for 30 minutes, then filter with 200-mesh nylon gauze to take the filter cake;

[0023] (2) Extraction: Disperse the washed sunflower plate wet material in 800mL of 0.6% sodium citrate solution, adjust the pH of the system to 2.50 with sulfuric acid, stir and extract at 80°C at 100 rpm for 2 hours, and then use 200 mesh Filter with nylon gauze, get the filtrate;

[0024] (3) Ultrafiltration desalination: Desalt the filtrate obtained by ultrafiltration, the operating pressure is 12bar, and the temperature is 25°C. When the conductivity of the system drops below 500μs / cm, the ultrafiltration is stopped, the retentate is recovered, and the filtrate is temporarily retained. liquid;

[0025] (4) Ion exchange: According to the order of adding anion exchange resin first, then adding cation exchange resin, add resin to the retenta...

Embodiment 2

[0028] (1) Water washing: add 80 g of sunflower pan powder passed through a 60-80 mesh sieve into 1500 mL of deionized water at room temperature, stir at 150 rpm for 20 minutes, then filter with 200 mesh nylon gauze to take the filter cake;

[0029] (2) Extraction: Disperse the washed sunflower plate wet material in 3500mL0.8% sodium citrate solution, adjust the pH of the system to 3.00 with sulfuric acid, stir and extract at 150 rpm at 90°C for 2.5h, and then use 200 Mesh nylon gauze filter, get the filtrate;

[0030] (3) Ultrafiltration desalination: Desalt the filtrate obtained by ultrafiltration, the operating pressure is 18bar, and the temperature is 40°C. When the conductivity of the system drops below 500μs / cm, the ultrafiltration is stopped, the retentate is recovered, and the filtrate is temporarily retained. liquid;

[0031] (4) Ion exchange: according to the order of adding anion exchange resin first, then adding cation exchange resin, add resin to the retentate ob...

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Abstract

The invention relates to a method for extracting natural low-ester pectin from sunflower heads. The method comprises the following steps: washing; extracting; carrying out ultrafiltration desalination; carrying out ion exchange to remove residual salt; carrying out spray drying; carrying out reverse osmosis; and recovering calcium citrate, wherein a chelating agent used for extraction is sodium citrate, the concentration is 0.4%-1.0% (sodium citrate: water), the extraction solid-to-liquid ratio is 1:20-1:50 (sunflower head dry powder: water), the pH is regulated to 2-4, then a great part of salt is removed by using an ultrafiltration membrane with the interception molecular weight of 5000-10000 Da, and the residual salt is removed by adopting the ion exchange. The method disclosed by the invention can achieve the pectin extraction rate by 10%-15% (in terms of galacturonic acid on raw materials) and is capable of removing the salt by more than 90% through the ultrafiltration desalination; and as for the prepared low-ester pectin, the esterification degree is 25%-30%, the amidation degree is 3%-10%, the content of the galacturonic acid is 65%-80% (on the pectin), and the weight-average molecular weight is 200-300 kDa. According to the method, the sodium citrate as the chelating agent has very high safety and can realize calcium citrate recovery through the addition of calcium hydroxide after reverse osmosis.

Description

technical field [0001] The invention belongs to the field of food colloids, and in particular relates to a preparation method of natural low-ester pectin which is extracted by a novel chelating agent and purified by ultrafiltration. Background technique [0002] Pectin is a complex polysaccharide widely present in the cell walls of land plants. In the processing of baked food, acid milk drink, fruit juice and other foods, pectin, as a hydrophilic colloid, has the functions of gelling, stabilizing and thickening. At the same time, pectin is also a natural water-soluble dietary fiber, which has beneficial effects such as regulating the microenvironment of the human intestinal tract and reducing blood lipids. [0003] Pectin can be divided into high-ester pectin (esterification degree>50%) and low-ester pectin (esterification degree<50%). At present, commercial pectin is mostly high-ester pectin, and its raw materials are mainly citrus fruit pomace, apple pomace, and be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/06
Inventor 华霄康佳琪杨瑞金陈颖张文斌赵伟
Owner JIANGNAN UNIV
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