CN104558239A - Apple pectin extraction technology - Google Patents

Abstract

The invention relates to an apple pectin extraction technology. The technology comprises steps as follows: crushing and screening apple peels, performing cleaning with hot water, removing impurities, spraying ethanol, and airing the raw material; adding water to the dried raw material, adjusting the pH value of the aqueous solution with hydrochloride acid, heating the aqueous solution for dissolution, and then performing filtration to obtain a solution; adding a hydrochloric acid solution with the mass being five times that of the raw material to filter residues, keeping the solution at the temperature of 95 DEG C for 15 min, then performing squeezing, taking juice, mixing the solution with the juice, and performing filtration; adding aluminum chloride to a hydrolysis filtrate, keeping the temperature at 40 DEG C, adding 2 mol/l of a sodium hydroxide solution while stirring, and adjusting the pH; cleaning precipitated pectin aluminum, removing water-soluble impurities, and dissolving the pectin aluminum with diluted hydrochloride acid; adding ethanol to the solution, recovering the ethanol after filtration, and cleaning precipitates with the ethanol; performing vacuum drying to obtain a pectin product. The technology has the benefits as follows: the processing method is simple and easy to operate, the yield is high, the problem that raw materials are limited is solved, resources are reasonably utilized, and the technology is energy-saving and environment-friendly.

Description

A kind of extraction apple pectin technology

Technical field

The present invention relates to extraction process field, be specifically related to a kind of extraction apple pectin technology.

Background technology

Pectin is a kind of acidic polysaccharose material in plant, and it is generally white to pale yellow powder, and being slightly with tart flavour, being mainly present in cell walls and the cell internal layer of plant, is the support substance of inner cell.Pectin is a kind of natural high moleculer eompound, has good gelationization and stable emulsifying effect, has been widely used in food, medicine, daily use chemicals and textile industry.Pectin has incorporated the life of people, and a large amount of pectin is applied to every trade industry industry.Current most pectin still with shaddock pericarp for raw material, extract pectin.And shaddock fruit is not the fruit had the call, so the extraction of pectin is limited.And apple is that in daily life, demand is very big, and containing pectin ultimate constituent in pericarp.

Summary of the invention

A kind of extraction apple pectin technology is the invention provides for the problems referred to above.

A kind of extraction apple pectin technology, utilize Pericarpium Mali pumilae for extracting raw material, it is characterized in that, technical matters is as follows:

(1), after Pericarpium Mali pumilae fragmentation, be the sieve screening of 2 ~ 3 millimeters with aperture, then with the hot water cleaning of 60 DEG C, to remove impurity, then spill ethanol, dry;

(2) raw material after drying is added the water of 15 times of raw materials quality, with hydrochloric acid, the pH value of the aqueous solution is adjusted to 1.6 ~ 6.3, is heated to 75 DEG C, constant temperature 1 hour, keep 18 hours, be dissolved in solution, then filter, obtain transparent solution; Filter residue adds the hydrochloric acid soln of raw materials quality 5 times again, is incubated 15 minutes, then squeezes taking juice, combined by two liquid, filter at the temperature of 95 DEG C;

(3) in hydrolysis filtrate, add tri-chlorination two aluminium of raw materials quality 40%, make temperature remain on 40 DEG C, stir, while add 2 mol/L sodium hydroxide solutions, adjustment pH to 4, makes pectin aluminum precipitation get off;

(4) hot water of the pectin aluminium of precipitation with 70 ~ 80 DEG C is cleaned 3-5 time, removing water-soluble impurity, then with dilute hydrochloric acid by pectin al dissolution;

(5) in solution, add ethanolic soln, again pectin is precipitated out, after filtration, reclaim ethanol, with ethanol by sediment undergoes washing 3-5 time;

(6) at the temperature of 70 DEG C, carry out vacuum-drying, about dry 8 hours, pectin finished product can be obtained.

Beneficial effect of the present invention: working method is simple to operation, yield rate is high, solves the unrestricted problem of raw material, reasonably utilizes resource, energy-conserving and environment-protective.

Embodiment

Raw material pulverizing and washing: after Pericarpium Mali pumilae fragmentation, be the sieve screening of 2 ~ 3 millimeters with aperture, then with the hot water cleaning of 60 DEG C, to remove impurity, then spill ethanol, dry.

Hydrolysis extraction: add water the raw material after drying (general water is 15 times of raw materials quality), with hydrochloric acid, the pH value of the aqueous solution is adjusted to 1.6 ~ 6.3, be heated to 75 DEG C, constant temperature 1 hour, keep 18 hours, make initial rubber be hydrolyzed to pectin, be dissolved in solution, then filter, obtain transparent solution.Filter residue adds the hydrochloric acid soln (pH value is hydrolyzed identical with first time) of raw materials quality 5 times again, is incubated 15 minutes, then squeezes taking juice, combined by two liquid, filter at the temperature of 95 DEG C.

Precipitation: tri-chlorination two aluminium adding raw materials quality 40% in hydrolysis filtrate, makes temperature remain on 40 DEG C, stirs, while add 2 mol/L sodium hydroxide solutions, adjustment pH to 4, makes pectin aluminum precipitation get off.

Dissolve after washing and acidifying: the pectin aluminium precipitate hot water of 70 ~ 80 DEG C is cleaned several, removes water-soluble impurity, then with dilute hydrochloric acid by pectin al dissolution.

Redeposition: add ethanolic soln in solution, be again precipitated out by pectin, reclaim ethanol after filtration, with ethanol by sediment undergoes washing several.

Dry: at the temperature of 70 DEG C, to carry out vacuum-drying, about dry 8 hours, pectin finished product can be obtained.The normally light yellow or brown of pure pectin is high methoxyl pectin.

Claims (1)

1. extract an apple pectin technology, utilize Pericarpium Mali pumilae for extracting raw material, it is characterized in that, technical matters is as follows:

(1), after Pericarpium Mali pumilae fragmentation, be the sieve screening of 2 ~ 3 millimeters with aperture, then with the hot water cleaning of 60 DEG C, to remove impurity, then spill ethanol, dry;

(2) raw material after drying is added the water of 15 times of raw materials quality, with hydrochloric acid, the pH value of the aqueous solution is adjusted to 1.6 ~ 6.3, is heated to 75 DEG C, constant temperature 1 hour, keep 18 hours, be dissolved in solution, then filter, obtain transparent solution; Filter residue adds the hydrochloric acid soln of raw materials quality 5 times again, is incubated 15 minutes, then squeezes taking juice, combined by two liquid, filter at the temperature of 95 DEG C;

(3) in hydrolysis filtrate, add tri-chlorination two aluminium of raw materials quality 40%, make temperature remain on 40 DEG C, stir, while add 2 mol/L sodium hydroxide solutions, adjustment pH to 4, makes pectin aluminum precipitation get off;

(4) hot water of the pectin aluminium of precipitation with 70 ~ 80 DEG C is cleaned 3-5 time, removing water-soluble impurity, then with dilute hydrochloric acid by pectin al dissolution;

(5) in solution, add ethanolic soln, again pectin is precipitated out, after filtration, reclaim ethanol, with ethanol by sediment undergoes washing 3-5 time;

(6) at the temperature of 70 DEG C, carry out vacuum-drying, about dry 8 hours, pectin finished product can be obtained.