CN1011188B

CN1011188B - Process extracting pectin from beencard firewood leaves

Info

Publication number: CN1011188B
Application number: CN86105966A
Authority: CN
Inventors: 陈福明; 柴文淼; 陈顺伟
Original assignee: Institute Of Forestry Science Of Zhejiang Province
Current assignee: Institute Of Forestry Science Of Zhejiang Province
Priority date: 1986-09-04
Filing date: 1986-09-04
Publication date: 1991-01-16
Also published as: CN86105966A

Abstract

The present invention relates to a method for preparing pure pectin. According to the method, pure pectin is obtained by using bean curd firewood leaves as a raw material through the processes of countercurrent extraction, precipitation in alcohol or aluminium salt, or washing by alcohol after drying, separation, etc. The yield rate of the pure pectin reaches 20 to 30%. Alternatively, nutrient pectin is obtained by using bean curd firewood leaves as raw material through the processes of decolourizing, de-odouring, drying and crushing. The pure pectin prepared by the method of the present invention has the advantages of simple processes, low cost, high yield and good quality.

Description

Process extracting pectin from beencard firewood leaves

The invention belongs to additive preparation technology, products obtained therefrom can be used as gelling agent and emulsifying agent, is widely used in food, medicine, cosmetics industry.Because the raw material during pectin is produced, problems such as quality and cost, domestic there be limited evidence currently of production can not be satisfied the needs in market far away, so the pectin that China uses mainly relies on import.

At present, the method for producing pectin of common employing is in the world: with tangerine peel, pomace, sunflower plate, megasse etc. is raw material, extracts pectin through the acid extraction alcohol precipitation method.Its technical process is: raw material is through preliminary treatment, extraction, filters, takes off flavor, and concentrated, precipitation, drying and pulverizing etc. obtain pectin.

The raw material that said method adopted, pectin content lower (0.2～25.0%) is added and is produced low, the complex manufacturing of productive rate, causes product cost height, price expensive.And process using raw material of the present invention is widely distributed bean curd bavin, and its leaf pectin content reaches 30～40%.

The object of the invention is to utilize the premna microphylla that is rich in pectin to be raw material, and by safe and reliable, simple, and the expensive low process route of productive rate produces pectin, to change the situation of the main dependence on import of domestic pectin.

The present invention is a raw material with the premna microphylla, and the new method of separating and extracting pectin is provided.Be characterized in that raw material need not to clean, dehydration, especially adopt the counter-current extraction, the productive rate of pectin is improved greatly, and, a large amount of alcoholic solutions have been saved because the concentration of pectin height need not in the production to concentrate, produce high-quality pure pectin, its degree of gelation reaches 150～200 grades.In addition, reach 30～40% characteristics according to pectin content in the premna microphylla, the present invention also provides a kind of method of direct acquisition nutrition pectin, and this nutrition pectin is rich in amino acid, the vitamin of needed by human, is a kind of novel pectin, and its degree of gelation is 40～60 grades.The technical essential that the present invention produces pectin is:

1, in premna microphylla, add acid solution, carry out counter-current extraction, through decolouring take off distinguish the flavor of crude pectin liquid, separate removal of impurities then, dry, pulverize and obtain pure pectin.The separation removal of impurities of this technology can be three kinds of methods, and (1) adopts the pure precipitation method; (2) adopt the aluminium salt precipitation method; (3) dry earlier, again with acid alcohol washing.The advantage of this technology is: pectin recovery rate height, save the concentration process in the typical process simultaneously, and avoided the depolymerization of pectin, and reduced cost, improve the quality of pectin.

2, the bright leaf of bean curd bavin is taken off flavor through decolouring and handle, drying is pulverized and is obtained novel nutrition pectin.The advantage of this technology is to make full use of high these characteristics of premna microphylla pectin content, directly pulverizes leaf texture through preliminary treatment and gets pectin, make its character that keeps original pectin, and method is simple, reduces equipment investment, is easy to apply.

Fig. 1 is for producing the process flow diagram of pure pectin.(1) is that the pure precipitation method are separated removal of impurities among the figure; (2) separate removal of impurities for the aluminium salt precipitation method among the figure; (3) are that the pure washing method in dry earlier back separates removal of impurities among the figure.

Fig. 2 is the process flow diagram of production nutrition pectin.

Embodiment 1: after premna microphylla is pulverized, be 1: 15～40 to add acid extraction liquid by solid-to-liquid ratio.(be preferably 1: 20～30), regulate pH1～3, the control extraction temperature is that 65～95 ℃ (being preferably in 80～85 ℃) carry out counter-current extraction 2～3 times, its each circular response time needs 20～60 minutes.Flavor then decolours each circulation gained countercurrent liquid, liquid pectin after flavor is taken off in decolouring precipitates with precipitating reagent (ethanol or isopropyl alcohol etc.), with the aqueous solution cyclic washing precipitation of same alcohol, filters to isolate precipitation (byproduct I) then, drying, pulverize pectin.Take off flavor and be food industry method of refining commonly used.The pectin that utilizes this technology to extract, productive rate is 20～30%, degree of gelation is 150～200 grades.

Embodiment 2: with the liquid pectin of premna microphylla gained after embodiment 1 described counter-current extracts and takes off flavor, directly spray-drying obtains crude pectin.Use acidity alcohol solution (contain alcohol more than 60%) to carry out circulation cleaning then, and in this circulation, use evaporation and exchanger resin decontamination, at last after filtration, dry and pulverize pure pectin.

Embodiment 3: with the liquid pectin of premna microphylla after embodiment 1 described counter-current extracts and takes off flavor, precipitate with aluminium salt, through filtering the mixed sediment that obtains aluminium salt pectin, use acidity alcohol solution circulation cleaning (byproduct II) then, at last with little alkali alcoholic solution washing neutralization (byproduct III) and dry, pulverize pectin.

Embodiment 4: with premna microphylla after decolouring is taken off flavor and is handled, dry, pulverize nutrition pectin.Utilizing this technology to obtain recovery rate is that 90% degree of gelation is 40～60 grades a nutrition pectin, and it can use at aspects such as jam.

The present invention compares with existing method, owing to adopted aboundresources, Japanese Premna that pectin content is high. So raw material sources are extensive, method is simple, be convenient to promote, and pectin productive rate height (20～30%), cost is low, and product reaches the FCC standard, can satisfy the industrial requirements such as food, medicine, cosmetics.

Claims

1, a kind of is the method for feedstock production pectin with the premna microphylla, through acid extraction, take off flavor, separation, removal of impurities, drying, pulverizing, the invention is characterized in: acid extraction is adopted the counter-current cycling extraction 2-3 time, solid-to-liquid ratio during extraction is 1: 15-40, pH1-3, temperature is 65-95 ℃, and each circulation required time is 20-60 minute.