CN103804510A - Sulfur-free konjac gum preparing method - Google Patents

Abstract

The invention provides a sulfur-free konjac gum preparing method. According to a technical scheme, ethanol solutions of different concentration are respectively added three times to carry out full immersion, dissolution and high pressure swirl washing on konjac powder; ethanol is recycled; a high pressure swirl washing unit is used to complete separate sulfur dioxide; edible sodium hydroxide is used to produce an alkaline environment; an acidic sulfur dioxide component in konjac glucomannan is adsorbed; and a vacuum microwave dryer is used to carry out rapid drying. The viscosity, the transparency and the color of a product are ensured.

Description

A kind of preparation method without sulphur konjak gum

Technical field

The present invention relates to a kind of konjak gum desulfurization technology, specifically a kind of preparation method without sulphur konjak gum.

Background technology

Konjak gum is take konjaku powder as raw material, the deep processed product processing through ethanol precipitation, its effective economic sector is glucomannan (KGM), KGM has 46 specific character 100 multiple uses such as film-forming properties, cohesiveness, suspension, can be widely used in the fields such as food, medicine, chemical industry, printing and dyeing, building, oil, electronics.

Konjaku has special biological characteristics, in the process that fresh Amorphophallus rivieri is processed into dry products, Enzymatic browning can occur.In fresh Amorphophallus rivieri dehydration preliminary working process, due to peeling and section cause histocyte to break, intracellular chemical composition is reacted under the effect of enzyme (being mainly polyphenoloxidase), produce rapidly brown stain, the serious commodity value that reduces konjaku dry plate, and outward appearance and the commodity value of the impact Rhizoma amorphophalli powder of processing.Industry does not have additive method can slow down the Enzymatic browning in drying course at present, it is dry that manufacturer can be used Hot Air Drying that fresh Amorphophallus rivieri is processed into konjaku, sulfurous gas in hot blast can be had an effect with polyphenoloxidase, thereby alleviate it, brown stain occurs, and plays color-protecting function.

Owing to having a small amount of sulfur dioxide residue wherein in whole fresh Amorphophallus rivieri drying course, although through washing with alcohol, but also cannot thoroughly the sulfurous gas adhering in Amorphophallus rivieri glucomannan dimeric molecule be weeded out, directly have influence on quality and the Application Areas of product, konjak gum desulfurization technology is also the technical barrier that the numerous producers of industry capture.

In order to seize without sulphur konjak gum market, numerous producer both domestic and external and scientific research institution are one after another using konjak gum desulfurization technology as emphasis brainstorm subject, through years of researches and test, comparatively ripe konjak gum desulfurization technology----ethanol precipitation at present, can remove preferably sulfurous gas composition, but but cannot be by complete sulfurous gas composition segregation excision.

Although wet processes technology can obtain not the konjak gum containing sulfurous gas, owing to needing to consume a large amount of edible ethanols in the course of processing, output high cost, and unclear to ash content, impurity separation, be difficult to be applied to suitability for industrialized production.

Summary of the invention

The object of the invention is to overcome prior art and can not thoroughly remove the problem of the sulfurous gas in konjak gum.

For reaching above-mentioned purpose, the invention provides a kind of preparation method without sulphur konjak gum, comprise the following steps:

1) the sulfur-bearing konjaku powder of getting ready is immersed in 38% ethanolic soln to agitator treating 30～50 minutes;

2) then use whizzer separating and dehydrating, the constant temperature within the scope of 20 ℃～25 ℃ of konjaku powder 38% ethanolic soln after separating is soaked 20～40 minutes to agitator treating 15 minutes;

3) by step 2) eddy flow washing in the high-pressure separator of underflow pump suction 0.3MPa～0.6MPa for the middle konjaku powder mixing solutions soaking, and use whizzer separating and dehydrating, again use 40% ethanolic soln agitator treating;

4) by step 3) in the konjaku powder mixing solutions that soaked put into colloidal mill and mill, adopt recirculated water to continue cooling to colloidal mill, assurance is milled temperature below 55 degrees Celsius, the granularity of milling is more than 120 orders, through whizzer separating and dehydrating, be that magic sub-glue is used 40% ethanolic soln agitator treating 20～30 minutes again by the konjaku powder after dehydration;

5) by konjak gum and alcohol mixed solution with in underflow pump suction 0.3MPa～0.6MPa high-pressure separator, give and wherein add sodium hydroxide eddy flow washing 20 minutes simultaneously, reuse whizzer and carry out processed;

6) at 60～80 ℃ of temperature to step 5) gained konjak gum carries out vacuum-drying to moisture≤13%;

7) to step 6) konjak gum of gained uses ternary Vibration Screen divisional processing, and powder-like products more than 120 orders is without sulphur konjak gum.

Above-mentioned steps 2) in by separate after konjaku powder with 38% ethanolic soln keep 20 ℃ immersions 30 minutes.

Tool of the present invention has the following advantages:

1, three alcohol precipitations, alcohol recycle.Ethanol is as the main media of konjak gum desulfurization, according to process technology scheme, add for three times respectively ethanolic soln that concentration is different by konjaku powder fully soak, dissolving, high pressure cyclone washing, ethanol recycling use;

2, applying high voltage vortex washer group, thoroughly separating SO 2.High pressure cyclone washing unit is to provide high pressure to grind environment for separating removal sulfurous gas, uses this device, glucomannan molecular backbone chain can be separated, and then remove sulfurous gas composition completely;

3, adopt food grade sodium hydroxide to manufacture alkaline environment, the acid sulfurous gas composition in absorption konjak glucomannan;

4, apply current state-of-the-art alcohol recovery system, alleviate alcohol and reclaim load, improve recovery utilization rate, reduce products production cost;

5, vacuum microwave drying, improves product viscosity, improvement color and luster.Adopt the rapid drying of vacuum microwave drying device, thereby guarantee product viscosity, transparency and color and luster.

Embodiment

In konjak gum, contained glucomannan is a kind of macromolecule polysaccharide, to be polymerized by β-1.4 glycosidic link by the molecular ratio glucose of 1: 1.6 and mannose residue, sulfurous gas is attached on konjac glucomanna main chain, is difficult to its rejecting by general physics and chemical process.Konjak glucomannan is soluble in water, but be insoluble to the organic solvents such as methyl alcohol, ethanol, ether, ethanol is a kind of well solvent, can dissolve many inorganicss, can dissolve again many organism, can make organism and the inorganics of participating in reaction all can dissolve, enlarge active surface, improves speed of reaction.Sulfurous gas is a kind of acidic substance, very easily water-soluble, and the molecular weight of sulfurous gas is 64.07, relative density 2.264 (0 ℃), fusing point-72.7 ℃, boiling point-10 ℃, solubleness 8.5% in 338.32kPa water (25 ℃), is soluble in ethanol.Utilize above characteristic, we are basic as purifying with ethanol precipitation in Project Product purification process, konjaku powder is immersed in ethanol standardized solution, utilize water different from the solvability of ethanol, impurities, ash content, sulfurous gas and heavy metal in konjaku powder are fully dissolved, after cryogrinding, again pass through alcohol immersion, the impurity in konjaku powder, ash content, heavy metal and most of sulfurous gas can be separated.Then through alcohol immersion, precipitation for the third time, under ultra-high voltage environment, konjak glucomannan molecular backbone chain is separated, through high pressure cyclone washing, coordinate and add proper amount of edible sodium hydroxide to manufacture alkaline environment, the sulfurous gas that is difficult to most in glucomannan molecule reject thoroughly can be separated, thereby obtain the not konjak gum containing sulfurous gas, finally by crossing the rapid drying of vacuum microwave drying device, finally obtain the not konjak gum containing sulfurous gas.

Based on above principle, the present embodiment provides a kind of preparation method without sulphur konjak gum, comprises the following steps:

1) the sulfur-bearing konjaku powder of getting ready is immersed in 38% ethanolic soln to agitator treating 30～50 minutes;

2) then use whizzer separating and dehydrating, the constant temperature within the scope of 20 ℃～25 ℃ of konjaku powder 38% ethanolic soln after separating is soaked to 20～40 minutes (30 minutes the bests), agitator treating 15 minutes;

3) by step 2) eddy flow washing in the high-pressure separator of underflow pump suction 0.3MPa～0.6MPa for the middle konjaku powder mixing solutions soaking, and use whizzer separating and dehydrating, again use 40% ethanolic soln agitator treating;

4) by step 3) in the konjaku powder mixing solutions that soaked put into colloidal mill and mill, adopt recirculated water to continue cooling to colloidal mill, assurance is milled temperature below 55 degrees Celsius, the granularity of milling is more than 120 orders, through whizzer separating and dehydrating, be that konjak gum is used 40% ethanolic soln agitator treating 20～30 minutes again by the konjaku powder after dehydration;

5) by konjak gum and alcohol mixed solution with in underflow pump suction 0.3MPa～0.6MPa high-pressure separator, give and wherein add sodium hydroxide eddy flow washing 20 minutes simultaneously, reuse whizzer and carry out processed;

6) at 60～80 ℃ of temperature to step 5) gained konjak gum carries out vacuum-drying to moisture≤13%;

7) to step 6) konjak gum of gained uses ternary Vibration Screen divisional processing, and powder-like products more than 120 orders is without sulphur konjak gum.

It should be noted that the konjaku powder relating in the present embodiment refers to the Rhizoma amorphophalli powder more than 80 orders.

After using this technology, the contrast of product (without sulphur konjak gum) quality is as follows:

Project	Before use	After use
			Viscosity mpa.s	28000	35000
Glucomannan (in dry %)	85	95
			Sulfurous gas PPM	500PPM	0
Moisture %	≤10	≤9

More than exemplifying is only to illustrate of the present invention, does not form the restriction to protection scope of the present invention, within the every and same or analogous design of the present invention all belongs to protection scope of the present invention.

Claims (2)

1. without a preparation method for sulphur konjak gum, it is characterized in that, comprise the following steps:

1) the sulfur-bearing konjaku powder of getting ready is immersed in 38% ethanolic soln to agitator treating 30～50 minutes;

2) then use whizzer separating and dehydrating, the constant temperature within the scope of 20 ℃～25 ℃ of konjaku powder 38% ethanolic soln after separating is soaked 20～40 minutes to agitator treating 15 minutes;

3) by step 2) eddy flow washing in the high-pressure separator of underflow pump suction 0.3MPa～0.6MPa for the middle konjaku powder mixing solutions soaking, and use whizzer separating and dehydrating, again use 40% ethanolic soln agitator treating;

4) by step 3) in the konjaku powder mixing solutions that soaked put into colloidal mill and mill, adopt recirculated water to continue cooling to colloidal mill, assurance is milled temperature below 55 degrees Celsius, the granularity of milling is more than 120 orders, through whizzer separating and dehydrating, be that konjak gum is used 40% ethanolic soln agitator treating 20～30 minutes again by the konjaku powder after dehydration;

5) by konjak gum and alcohol mixed solution with in underflow pump suction 0.3MPa～0.6MPa high-pressure separator, give and wherein add sodium hydroxide eddy flow washing 20 minutes simultaneously, reuse whizzer and carry out processed;

6) at 60～80 ℃ of temperature to step 5) gained konjak gum carries out vacuum-drying to moisture≤13%;

7) to step 6) konjak gum of gained uses ternary Vibration Screen divisional processing, and powder-like products more than 120 orders is without sulphur konjak gum.

2. the preparation method without sulphur konjak gum as claimed in claim 1, is characterized in that, described step 2) in by separate after konjaku powder with 38% ethanolic soln keep 20 ℃ immersions 30 minutes.