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Method for preparing beet pectin in diluted acid-pressing way

A technology of beet pectin and dilute acid, which is applied in the field of pressurized assisted dilute acid to directly extract pectin from beet wet meal and pectin preparation, which can solve the problem that heating time aggravates the degree of degradation of pectin molecules and affects the mass transfer of beet pectin Effects, increased loss of raw materials, etc., to avoid degradation and loss of neutral sugar on the side chain, to achieve large-scale production, to improve yield and quality

Active Publication Date: 2016-02-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is not only cumbersome and energy-consuming, but also increases the loss of raw materials to a certain extent.
Secondly, during the extraction process, the rapid expansion of wet beet meal after absorbing water increases the viscosity of the system, which affects the mass transfer effect of beet pectin
Although prolonging the extraction time can compensate for the adverse effects of poor mass transfer, prolonging the heating time intensifies the degradation of pectin molecules, and ultimately leads to the decline in the quality of pectin

Method used

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  • Method for preparing beet pectin in diluted acid-pressing way
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  • Method for preparing beet pectin in diluted acid-pressing way

Examples

Experimental program
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Effect test

Embodiment 1

[0030]Weigh 1200g of fresh sugar beet pressed meal with a water content of 80% (mass content), spray and wash with 25°C water to remove residual sugar, put it into an extraction tank after draining, add deionized water, and the mass ratio of pressed beet meal to deionized water is 1:18, add hydrochloric acid with a concentration of 2mol / L, adjust the pH value to 3.0, stir evenly at 50rpm, let stand at a constant temperature at 82°C for 30min, boost the pressure of the extraction tank to 0.1Mpa, hold the pressure for 4min, and return the pressure gauge to 0.0 Mpa, stir at 80rpm for 30min and let it stand still, then raise the pressure to 0.13Mpa, hold the pressure for 3min, reduce to normal pressure, stir at 120rpm for 30min. Bent sieve filtration solid-liquid separation, adding mass concentration to the filtrate is 5% NaCO 3 The solution was maintained at a pH of 4, filtered through a filter cloth, and the filtrate was concentrated to 30% of the original volume by an evaporato...

Embodiment 2

[0032] Weigh 2000g of beet pressed meal stored at -15°C, after slow freezing, spray with warm water at 35°C to remove impurities such as residual sugar on the surface of the pressed meal, drain and contain 75% water, put it into an extraction tank, add deionized water, and press beet The mass ratio of meal to deionized water is 1:20, add nitric acid with a concentration of 1.5mol / L, adjust the pH value to 2.5, stir evenly at 45rpm, let it stand at a constant temperature of 78°C for 35min, and increase the pressure in the tank to 0.12Mpa. Hold the pressure for 3 minutes, return the pressure gauge to 0.0Mpa, stir at 90rpm for 20min, then raise the pressure to 0.15Mpa, hold the pressure for 4min, reduce to normal pressure, and stir at 100rpm for 30min. Filtrate and carry out solid-liquid separation, add the NaCO that mass concentration is 4% to filtrate 3 The solution was maintained at a pH of 3.3, vacuum filtered, and the filtrate was concentrated to 25% of its original volume a...

Embodiment 3

[0034] Weigh 1800g of beet pressed meal stored at ‐5°C, spray and wash with 30°C water to remove residual sugar after slow freezing, after draining, the water content is 78% (mass content), put it into an extraction tank, add deionized water, and press beet The mass ratio of meal to deionized water is 1:15, add phosphoric acid with a concentration of 1.2mol / L, adjust the pH value to 3.2, stir at 50rpm, let it stand at a constant temperature of 80°C for 50min, and increase the pressure of the extraction tank to 0.15Mpa , hold the pressure for 5 minutes, return the pressure gauge to 0.0Mpa, stir for 20 minutes and let stand, then increase the pressure to 0.20Mpa, hold the pressure for 3 minutes, reduce to normal pressure, and stir for 30 minutes at 120rpm. The extract was filtered through a plate frame to obtain a clarified filtrate, and then the NaCO with a mass concentration of 3% was added to the filtrate. 3 The solution was maintained at a pH of 3.2, filtered through a filte...

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Abstract

The invention discloses a method for preparing beet pectin in a diluted acid-pressing way. The method comprises the following steps: slowly refrigerating fresh pressed pulp or stored refrigerated pressed pulp by taking wet pulp having the water content being 75 to 80 percent as a raw material, washing with clear water, draining off, loading into an extraction tank, and adding deionized water; adjusting the pH value of a solution with acid; soaking at 65-85 DEG C; periodically raising the pressure in the extraction tank in a soaking process, keeping the pressure, recovering to normal pressure, raising the pressure and lowering the pressure to the normal pressure, wherein a pressure changing period lasts for 1 to 3 times; stirring the materials in the extracting tank to obtain crude filtrate; adding a carbonate solution into the crude filtrate, and finely filtering in a filter press; concentrating the finely-filtered pectin extracting solution, and precipitating; removing a solvent, and drying to obtain the beet pectin. The method is mild in reaction conditions and simplified in process, the problem of poor mass transfer caused by absorption expansion of beet wet meal is solved, degradation of pectin molecules and the loss of neutral sugars on side chains are avoided, the yield and quality of the pectin are improved, and the processing cost is lowered.

Description

technical field [0001] The invention relates to a pectin preparation technology, in particular to a method for directly extracting pectin from sugar beet wet meal with pressurized assisted dilute acid, belonging to the field of deep processing of agricultural products. Background technique [0002] Sugar beet has been cultivated as a sugar crop for 200 years, and the planting area of ​​sugar beet in the world accounts for about 48% of sugar crops, ranking second after sugarcane. Beet pulp is a by-product of sugar beet root cutting and hot leaching. The wet pulp is squeezed to remove part of the water, which is called pressed meal. Its moisture content is about 75-80%. The output of pressed meal accounts for about 20-30% of the sugar beet is a by-product of sugar beet sugar production. Sugar factories are all produced in winter in the north, and the pressed meal is easy to store in natural freezing. At present, the pressed meal of beet sugar factories at home and abroad is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/06
Inventor 孟赫诚郭晓明于淑娟
Owner SOUTH CHINA UNIV OF TECH
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