Method for extracting low-methoxy pectin from apple pomace

A technology of low methoxyl pectin and apple pomace is applied in the field of pectin extraction to achieve the effects of improved extraction rate, excellent pigment removal effect and high practical value

Inactive Publication Date: 2014-06-04
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to solve the deficiencies of the above-mentioned technical problems, and provide a method for extracting low-methoxyl pectin from apple pomace, which has a simple process and solves the need to dissolve and lower the lipid content of the finished pectin in the existing traditional process. The complex process of re-precipitation and drying, the raw material reagents used in the production are common reagents, convenient and cheap to buy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for extracting low-methoxyl pectin from apple pomace, the specific extraction steps are:

[0022] Step 1. According to the mass ratio of water and apple pomace of 1:2, add 30°C water to the apple pomace to wash twice; then add 35°C water to the washed apple pomace and mix evenly. Power microwave treatment for 10 minutes; then filter, put the filtered apple pomace under the microwave power of 500W and microwave dry for 10 minutes, then dry at 60°C for 2 hours, take it out and cool to room temperature, then pulverize it to 50 mesh to obtain apple pomace powder, and set aside;

[0023] Step 2, mix the apple pomace powder after crushing with the aqueous hydrochloric acid solution with a pH value of 2 in a mass ratio of 1:20, and the resulting mixture is treated with microwaves at a power of 480W for 20 minutes, and centrifuged to take the supernatant; The supernatant was heated to 60°C and concentrated for 2 hours to obtain a concentrated solution, which was set as...

Embodiment 2

[0027] A method for extracting low-methoxyl pectin from apple pomace, the specific extraction steps are:

[0028] Step 1. According to the mass ratio of water and apple pomace of 1:2, add water at 40°C to the apple pomace to wash for 3 times; then add water at 40°C to the washed apple pomace and mix evenly. Power microwave treatment for 30 minutes; then filter, put the filtered apple pomace under the condition of microwave power 500W and microwave dry for 20 minutes, then dry at 70°C for 2-3 hours, take it out and cool it to room temperature and grind it to 60 mesh to obtain apple pomace powder. spare;

[0029] Step 2, mix the apple pomace powder after crushing with the aqueous hydrochloric acid solution with a pH value of 3 in a mass ratio of 1:20, and the resulting mixture is treated with microwaves at a power of 500W for 40 minutes, then centrifuged to get the supernatant; The supernatant was heated to 60°C and concentrated for 2 hours to obtain a concentrated solution, wh...

Embodiment 3

[0033] A method for extracting low-methoxyl pectin from apple pomace, the specific extraction steps are:

[0034] Step 1. According to the mass ratio of water and apple pomace of 1:2, add water at 35°C to the apple pomace to wash for 3 times; then add water at 39°C to the washed apple pomace and mix evenly. Power microwave treatment for 20 minutes; then filter, put the filtered apple pomace under the condition of microwave power 500W and microwave dry for 15 minutes, then dry at 65°C for 2.5 hours, take it out and cool to room temperature, then pulverize to 55 mesh to obtain apple pomace powder, set aside ;

[0035] Step 2, mix the apple pomace powder after crushing with the sulfuric acid aqueous solution with a pH value of 2.5 in a ratio of 1:20 by mass ratio, and after the obtained mixture is treated with microwaves at a power of 490W for 30 minutes, centrifuge to get the supernatant; The supernatant was heated to 60°C and concentrated for 2 hours to obtain a concentrated s...

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Abstract

The invention discloses a method for extracting low-methoxy pectin from apple pomace, comprises the following steps: washing apple pomace by using water at 30-40 DEG.C, microwave treating at 380-500 W and then filtering, microwave drying, the filtered apple pomace, stoving and crushing to obtain apple pomace powder, mixing the apple pomac powder and acid water to perform microwave treatment at 480-500 W, concentrating centrifuged supernatant as concentrated solution, pouring the concentrated solution in an upright filled with active carbon, and collecting the filtrate; heating the filtrate to 5-10 DEG.C, adding alkali solution to regulate the pH value, adding the acid water in the obtained pectin concentration solution to regulate the pH value to 3-5, adding ethanol water in the pectin concentrated solution, mixing, standing and centrifuging to obtain the precipitate, washing by using the ethanol water for 7-8 times, washing, precipitating, vacuum freezing and drying to obtain a substance, namely, the low-methoxy pectin. The process is coherent and simple, the required reagent is reagent in common use, low in cost and easy to purchase; the extracting rate can achieve 7.9-9.4%, the esterfication degree is 38.7-41.4%, and the galacturonic acid content is 72-82%.

Description

technical field [0001] The invention relates to a method for extracting pectin, in particular to a method for extracting low-methoxyl pectin from apple pomace. Background technique [0002] Apple pomace is the main waste in fruit juice production, accounting for 20% to 25% of the processing volume, and the pectin content in apple pomace is rich, about 15%. Pectin is a natural food additive. It can not only be used as a stabilizer, emulsifier and thickener, but also has the effect of lowering blood sugar, blood fat and cholesterol. Therefore, it is of great significance to the development of pectin production methods. According to the proportion of galacturonic acid methyl esterification in its molecular chain, pectin can be divided into low methoxyl pectin (esterification degree less than 50%) and high methoxyl pectin (esterification degree greater than 50%) . Among them, high methoxyl pectin has outstanding thickening and gelling effects, and is widely used in food, medic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/06
Inventor 朱文学曲昊杨吴建业熊瑞张棋樊金玲罗磊张晓宇向进乐孙晓菲
Owner HENAN UNIV OF SCI & TECH
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