Novel method for extracting pectin from sweet potato dregs

A technology of sweet potato dregs and pectin, which is applied in the direction of pharmaceutical formulations, medical preparations containing active ingredients, food preparation, etc., can solve the problems affecting the quality and purity of pectin products, and high cost, so as to improve comprehensive economic benefits and low cost , The effect of easy factory production

Active Publication Date: 2010-01-20
INST OF AGRO FOOD SCI & TECH CHINESE ACADEMY OF AGRI SCI
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  • Application Information

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Problems solved by technology

There is a large amount of starch in sweet potato dregs. How to obtain high-purity and high-quality sweet potato pectin by simple and effective methods is a technical problem. Convent

Method used

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  • Novel method for extracting pectin from sweet potato dregs
  • Novel method for extracting pectin from sweet potato dregs
  • Novel method for extracting pectin from sweet potato dregs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1, the process optimization of extracting sweet potato pectin

[0049] 1. Sweet potato residue crushing and particle size determination

[0050] A laser particle size analyzer (BT-9300H) was used to measure the particle size distribution of sweet potato starch to determine the sieve aperture when removing starch. The results show that the particle size of sweet potato starch is mainly distributed in 0-35μm (see figure 2 ).

[0051] Weigh 30g of sweet potato dregs (the variety is Xu 55-2), pulverize with a universal grinder (FW100 type), observe the particle size distribution range of sweet potato dregs at different crushing times (sweet potato dregs particle size is 0-150 μm, and 35-150 μm particles account for the total 50-70% is the best crushing time), and finally the best crushing time is determined to be 20s.

[0052] 2. Separation of sweet potato dietary fiber from sweet potato residue

[0053] The crushed sweet potato residue is first passed through...

Embodiment 2

[0068] Embodiment 2, sweet potato pectin extraction rate and purity detection

[0069] 1. Sweet potato residue crushing and particle size determination

[0070] Weigh 30g of dried sweet potato dregs (type Xu 55-2), pulverize them with a universal grinder (FW100 type) for 20s, and measure the particle size distribution range of sweet potato dregs at different crushing times. 150μm particles accounted for 50-70% of the total.

[0071] 2. Separation of sweet potato dietary fiber from sweet potato residue

[0072] Mix 15g of sweet potato residue obtained in step 1) with water at a mass ratio of 1:60 to form a suspension, adjust the pH value of the solution to 5.0, sieve for 20min at a reciprocating vibration frequency of 3.75Hz, and remove starch to obtain 3.66g of meal Fiber (this number is the following DF1) (see Figure 4 ), of which the total dietary fiber content is 2.97g (this number is DF2 below)

[0073] The calculation method of dietary fiber extraction rate and purit...

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Abstract

The invention discloses a novel method for extracting pectin from sweet potato dregs. The method comprises the following steps of: 1) preparing the sweet potato dregs into a suspension, carrying out physical screening processing on the suspension, and removing most starch to obtain dietary fibers with higher purity; 2) using amylase to carry out enzymolysis on residual small amount of starch in the dietary fibers in step 1), carrying out centrifugation, removing supernate, and collecting sediments; and 3) preparing the sediments obtained in step 2) into the suspension, adding Na2HPO4 solution into the suspension to extract the pectin, carrying out centrifugation after extracting, collecting supernatant, and carrying out concentration and drying to obtain pectin powder. The method can make the extraction ratio of the sweet potato pectin reach 95.87 percent and the purity of pectin products reach 91.28 percent (taking Xu55-2 as a material). The method has the advantages of high extraction ratio, high pectin purity, strong practicality, easy industrialization and the like. The products can be directly used as food additives or pharmaceutical excipients. The method not only can improve the comprehensive economic benefit of potato processing, but also can reduce the environmental pollution caused by accumulation of the potato dregs.

Description

technical field [0001] The invention relates to a method for extracting pectin from sweet potato residue. Background technique [0002] my country is the largest producer of sweet potatoes in the world. According to FAO statistics, the output of sweet potatoes in my country was about 107 million tons in 2005, accounting for 84.64% of the world's total output. In my country, sweet potatoes are mainly used to extract starch, make vermicelli, vermicelli, and develop sweet potato beverages. During the processing, a large amount of potato dregs are produced, accounting for about 10%-14% of raw materials, depending on the variety. The dietary fiber content in sweet potato residue is about 22%, and the pectin content in sweet potato dietary fiber is about 25%, which is a good source of pectin. At present, potato residues are mainly used for animal feed or discarded directly, causing environmental pollution and great waste of resources. [0003] Dietary fiber is a general term for...

Claims

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Application Information

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IPC IPC(8): A23L1/308A23L1/30A23L1/03A23L1/216A23L1/28A61K31/732A61P3/06A61P3/10A61P35/00A23L29/231A23L33/00A23L33/10A23L33/22
Inventor 木泰华韩俊娟曹媛媛梅新
Owner INST OF AGRO FOOD SCI & TECH CHINESE ACADEMY OF AGRI SCI
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