CN1079399C

CN1079399C - Method for extracting flax gum with high pectin content from flax seeds

Info

Publication number: CN1079399C
Application number: CN98104930A
Authority: CN
Inventors: 刘万毅
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-01-12
Filing date: 1998-01-12
Publication date: 2002-02-20
Anticipated expiration: 2018-01-12
Also published as: CN1193628A

Abstract

The present invention provides a method for extracting flax gum with high pectin content from flax seeds, which relates to the preparation of polysaccharide. Flax gum is extensively used in the fields of food, medicine and light industries. The present invention discloses a new technological method for extracting the flax gum from the flax seeds. The gum-producing rate of the method can reach about 20%, and the extracted gum is polysaccharide with pectin as the main component. The flax seeds after gum extraction can also be used for oil expression with good oil expression effect. Compared with the prior art, the present invention not only greatly improve the content of pectin in products and greatly reduce the content of impurities, such as starch, etc., but also can greatly reduce energy consumption and production cost, improve production efficiency and save investment. The present invention is convenient for large-scale commercial production.

Description

From flaxseed, extract the method for the flax gum of high pectin content

A kind of height that extracts from flaxseed really contains the dirty method of glue content flax, relates to the preparation of polyose.

Flaxseed gum claims Franklin glue, flax gum again, in fields such as food, medicine, light industrys extensive use is arranged.Chinese patent CN1072184A discloses a kind of method of extracting flax gum with acid solution (sulfurous acid and citric acid mixed solution) hydrolysis from flaxseed.Its technology is that the cleaning linseed seed is used the acid solution hydrolysis earlier, and centrifugal solid-liquid is separated, concentrates, is drying to obtain then.Though this method can propose water-insoluble glue, non-pectic substance content is very high in the gained flax gum.Pectin class content is less than 70% in the solid-state dry glue powder, and this just makes applying of product be subjected to certain limitation; In addition, this technology consumption pure water amount is big, and the enrichment process power consumption is big; Cause production cost higher; Life side's inefficiency; Certain limitation is arranged aborning.

The objective of the invention is to disclose a kind of novel process of from flaxseed, extracting the flax gum of high pectin content.Extract flax gum by this technology from flaxseed, pectin class content is greater than 80% in the gained finished product thing, and rate of gum output is stabilized in about 20%.Compared with prior art the present invention has following distinguishing feature:

The consumption of extraction solvent water can reduce 1/4～1/3; The solubility rate of non-pectic substance such as albumen, starch etc. has decline by a relatively large margin; At last, this process using metal-salt precipitating, it is effective fast not only to concentrate glue, easy handling, and can effectively remove impurity such as Zulkovsky starch, particularly avoided the highly energy-consuming operation of a large amount of evaporation concentration moisture content, production cost is reduced, and production efficiency improves, and saves investment.Being convenient to heavy industrialization implements.

Embodiments of the invention are explanation in detail in conjunction with the accompanying drawings.

Accompanying drawing 1 is a process flow sheet of the present invention.

As shown in Figure 1, the present invention realizes by following technology:

Cleaning raw material → rinsing → from doing → demineralized water one-level lixiviate → filter Filtrate A and filter cake; This filter cake → acid solution secondary is hydrolyzed → filters to get filtrate B; Filtering A+B → one-tenth ammonium salt → slaine precipitating → washing is from doing → the acid solution hydrolysis → precipitation with alcohol → from do → drying → finished product is comprising following committed step:

1. demineralized water one-level lixiviate: the ratio that refers to feed liquid is 1: 5-10, Neutrality, extract temperature are 80～108 ℃, temperature retention time 1-3 hour bar Carry out under the part, separate while hot the solid-liquid two-phase, get filtrate A and filter cake.

2. above-mentioned filter cake adds the hydrolysis of acid solution secondary, and the acid of being adopted is the mixed solution of hydrochloric acid and phosphoric acid, and the ratio of hydrochloric acid and phosphoric acid is 1: 1～8, and the extracting solution pH value is at 1.9～3.6 temperature 85-95 ℃, reaction times 1-3 hour.Solid-liquid ratio is 1: 7-15.Get liquor B after the filtration.

3. filtrate A is mixed with B, transferring PM with ammoniacal liquor then is 4.5～6, makes that pectin becomes ammonium salt in the glue, and then adding an amount of aqueous metal salt, to make in the glue tartaric acid carboxyl generate pectate water insoluble, and be precipitated out, making starch simultaneously, water-soluble components such as oligose are separated with colloid; Add the mixed aqueous solution that metal-salt is iron(ic) chloride or iron(ic) chloride and aluminum chloride, this precipitate and separate is come out, with the soft water repetitive scrubbing and from do the higher mashed prod of solid content.

4. go up recklessly and add ethanolic soln acidolysis and the washing that contains appropriate hydrochloric acid in the mashed prod, wash with the hydrochloric acid of 5-15% and the alcohol mixeding liquid acidolysis of 60%-95% earlier, the alkaline ethanol washing of usefulness 70-80% again, usefulness 50-95% washing with alcohol is fine at last must white throw out.

5. dry vacuum-drying under 30-60 ℃ temperature.

For a more detailed description to the present invention by the following examples

Embodiment 1

Get the clean flaxseed of 100g,, add softening water 1000ml then, be warming up to 95 ℃ with draining after the softening water rinsing, lixiviate 2 hours, solid-liquid separation gets filtrate A and filter cake (flaxseed) while hot; This filter cake is mixed with 1000ml soft water, and the mixed solution (hydrochloric acid was made into 1: 1,1: 3 by volume mixing of hydrochloric acid and phosphoric acid) that adds hydrochloric acid and phosphoric acid is subsequently transferred PH=2.5, is warming up to 95 ℃, lixiviate 1.5 hours, and B filters to get filtrate.Filtrate is merged, transfer PH=5.0 with 4M ammoniacal liquor, ferric chloride in aqueous solution with 3-5% slowly adds subsequently, obtain the pulpous state throw out, leave standstill and get final product layering, filter water washing and precipitating and drain, the alcohol mixeding liquid that is 10% hydrochloric acid and 70% with this throw out mass concentration then washing, metal ion is cemented out from pectate, thereby obtain high density flax gum based on pectin; Being 75% alkaline alcohol washing flax gum again with mass concentration, is that 50%, 95% aqueous ethanolic solution washs with mass concentration at last successively, and 35 ℃-50 ℃ of the positive vacuum conditions of suction filtration postprecipitation thing, temperature will promptly get product after the pulverizing after dry 5-8 hour.

Carried the seed of glue, the oil expression of oven dry back, effect is satisfactory.

Embodiment 2

Mainly be when the lixiviate of neutral water one-level, be warming up to 105 ℃, lixiviate 1 hour, PH=2 when acid solution is carried glue, other parameter constant can obtain satisfied effect equally.

Embodiment 3

When mainly being metal salt precipitate, add the aqueous solution that contains 3% iron(ic) chloride and 3% aluminum chloride, other step is the same can to get promising result equally.

Products obtained therefrom is carried out the physico-chemical analysis result is: water content＜10.0%, ash＜9.0%, gamma value 78.1～79.2; Pectic acid content 20% ± 1%, protein content 7.8% ± 1.0%, starch content 3.2% ± 0.5%, total sugar content 30% ± 0.8%; 1% aqueous ph value 4.25; Pectin total content 81.2%+0.5%.

The Preliminary Applications experiment shows that this product has good emulsifying, gelling ability.

Claims

1. novel method of from flaxseed, extracting the flax gum of high pectin content, its technology is:

1. cleaning raw material, adds the softening water one-level then and carries glue from doing through the washing removal of impurities, will carry glue filter make seed separate with glue filtrate A; 2. one-level is carried flaxseed behind the glue and is added the hydrolysis of acidic aqueous solution secondary and carry glue, then after filtration liquor B; 3. filtrate A and liquor B are merged, add ammoniacal liquor and transfer pH value, and make pectin become ammonium salt, and then add ferric chloride aqueous solutions or iron trichloride and aluminum chloride arbitrary proportion blended aqueous solution precipitation glue; To precipitate after filtration and separate, and after washing drains, add hydrochloric ethanol liquid acidolysis and washing again, and use alkaline ethanol successively, the neutral alcohol washing, is pulverized and is promptly got the solid flax gum at last with the solid substance drying to neutral.

2. the method for extracting flax gum from flaxseed according to claim 1 is characterized in that the one-level lixiviate is neutral soft water PH=7, and temperature is 80～108 ℃, extraction time 1-3 hour.

3. the method for extracting flax gum from flaxseed according to claim 1, it is characterized in that: the acid that the acid solution hydrolysis is adopted is the mixed solution of hydrochloric acid and phosphoric acid.

4. the method for extracting flax gum from flaxseed according to claim 3, wherein the volume ratio of hydrochloric acid and phosphoric acid is 1: 1～8.

5. the method for extracting flax gum from flaxseed according to claim 1 is characterized in that: the acid extraction liquid PH=1.9-3.6 of acid solution hydrolysis, 85～95 ℃ of temperature, reaction times 1-3 hour.

6. the method for extracting flax gum from flaxseed according to claim 1 is characterized in that: it is 4.5～6 that filtrate is transferred PH with ammoniacal liquor.

7. the method for extracting flax gum from flaxseed according to claim 1 is characterized in that: ferric chloride aqueous solutions or iron trichloride and the aluminum chloride arbitrary proportion blended aqueous solution are the aqueous solution of the mixed of the ferric chloride aqueous solutions of concentration ∠ 10% or iron trichloride and aluminum chloride arbitrary volume.

8. the method for from flaxseed, extracting flax gum according to claim 1, it is characterized in that washing the flax gum precipitated metal thing that drains earlier with 5～15% aqueous hydrochloric acid and 60%～95% acidic ethanol solution washing, use 70～80% alkaline ethanol solution washing again, with the aqueous ethanolic solution washing of 50%-95%, be mass percent concentration on it at last.