CN101491275A - Edible food pectin preservative film and preparation method and use thereof - Google Patents

Abstract

The invention discloses a natural, edible, solid and convenient edible food pectin fresh-keeping film. At the same time, the invention also discloses a preparation method of the edible food pectin fresh-keeping film. In this method, pectin and deionized water are prepared into fruit latex, and then a natural edible film-forming agent is added to the pectin latex to make a composite emulsion; Dry naturally in a film container to obtain edible food pectin preservative film. The edible food pectin preservative film of the present invention has good shear resistance and tensile strength, has the properties of oxygen permeability, carbon dioxide permeability, water vapor permeability, etc. suitable for most foods, is edible and pollution-free, and is suitable for fruit , vegetable preservation and other food preservation fields.

Description

Edible food pectin preservative film and its preparation method and application

technical field

The invention belongs to the technical field of food, and relates to a pectin film, in particular to an edible food pectin preservative film; meanwhile, the invention also relates to a preparation method and application of the edible food pectin preservative film.

Background technique

At present, the widely used food preservation film is plastic preservation film, mainly made of polyethylene (PE) and polyvinylidene chloride (PVDC). The fresh-keeping film made of PE material is mainly used for fresh-keeping of fruits and vegetables that people usually buy. The fresh-keeping film made of PVDC is mainly used for fresh-keeping of some cooked food, ham and other products. Although PE and PVDC materials do not cause harm to the human body, the monomers used to produce PE and PVDC are toxic substances, which will remain in PE and PVDC materials, so that food preservation films made of PE and PVDC are harmful to human body during use. Harm to the human body. In addition, plastic wrap made of PE and PVDC is not easy to degrade when discarded in the environment after use, causing "white pollution".

Therefore, people use raw materials that are safe for the human body, such as natural sugars, starches, proteins, oils and other edible materials, by adding film-forming additives, controlling film-forming conditions, and coating or directly forming a film on the surface of fruits and vegetables. A plastic wrap with extremely thin layers, uniform transparency and microporous channels. The fresh-keeping method of fruit and vegetable surface coating is based on the characteristics of physiological changes of fruits and vegetables after picking. The food-grade anti-oxidation color-protecting agent, bactericide, bacteriostat, and film-forming agent that are non-toxic to the human body are selected to compound the fruit and vegetable coating preservation solution. The liquid can be soaked, sprayed or coated on the surface of fruits and vegetables to form a layer of transparent semi-permeable edible fresh-keeping film. The fresh-keeping film prepared by the method is close to the surface of the fruits and vegetables, which is easy to block the pores on the surfaces of the fruits and vegetables, and affects the normal physiological functions of the fruits and vegetables. Moreover, the coated fresh-keeping film can only be used for keeping fresh fruits and vegetables fresh, and cannot be used for keeping fresh of other foods, which is inconvenient to use. Although the direct film-forming edible film has good air permeability and can be used for various food preservation, it often does not reach the required mechanical strength, which is not conducive to food preservation.

Pectin is a natural polymer compound, polygalacturonic acid, widely present in the primary cell wall and intercellular matrix of higher plants, and plays the role of bonding cells together. Application No. 01815090.X, titled "Pectin Film Composition", discloses a film-forming composition comprising pectin, at least one additional film-forming polymer and a coagulation system, for pharmaceutical, veterinary, Food, cosmetic or other products, such as films for packaging food products, ear lavender or jelly, preferably for pre-dosed formulations such as soft or hard capsules. The preparation of the pectin film composition has many raw material components and complicated process.

Contents of the invention

In order to solve the deficiencies of the above-mentioned prior art, the primary purpose of the present invention is to provide a natural, edible, solid, and easy-to-use edible food pectin preservative film.

Another object of the present invention is to provide a preparation method of the above-mentioned edible food pectin plastic wrap.

Another object of the present invention is to provide the application of the above-mentioned pectin cling film for edible food.

The purpose of the present invention is achieved through the following technical solutions: an edible food pectin preservative film, the composition ratio of which is: pectin 100-300

  Deionized water 700～900

Glycerin 10～60

The above components are all in parts by mass.

The preparation method of above-mentioned edible food pectin preservative film, comprises the following steps:

(1) Preparation of pectin emulsion: 100-300 parts by mass of pectin and 700-900 parts by mass of deionized water are stirred and dispersed into a pectin emulsion with a mass concentration of 10-30%;

(2) Preparation of the compound pectin solution: add 10-60 parts by mass of glycerin to the above-mentioned pectin emulsion and keep it warm for 60-70 minutes at 75-85° C. to obtain the compound pectin solution;

(3) Homogenization: homogeneously disperse the compound pectin solution at 3500-4500rpm/min for 10-15min;

(4) Film formation: Pour 8ml of compound pectin solution into the proportion of ^1cm2 area, pour the homogenized compound pectin solution into the film forming device to form a film, dry at 60-65°C for 12-14 hours , and then peel off the film to obtain the pectin preservative film for edible food.

The pectin in the step (1) is commercial pectin, which is natural pectin extracted from plants.

The glycerin in the step (2) is commercial glycerin, which is natural glycerin extracted from plants.

In order to better realize the present invention, the pectin is natural pectin extracted from fruits and vegetables, preferably banana pectin, citrus pectin or sunflower pectin.

The light transmittance of the edible food pectin preservative film obtained by the above-mentioned preparation method is 80～85%, the tensile strength is 2700～3000MPa, the elongation at break is 1.4～1.8%, and the 25 ℃ water vapor transmission rate is 15～ 20g/m ² ·24hr, the oxygen transmission rate at 23°C is 60-90ml/m ² ·d·atm, and the carbon dioxide transmission rate at 23°C is 1300-1430ml/m ² ·d·atm.

The edible food pectin fresh-keeping film is applied to the field of food preservation.

The edible food pectin preservative film is used as a fruit preservative film or a vegetable preservative film.

The formation of edible food pectin plastic wrap is mainly due to the fact that its structure contains galacturonic acid polymers and their ester compounds linked by α-1,4-glucosidic bonds. On the one hand, the outer group of galacturonic acid polymers On the other hand, the carboxyl group on the outer group of the galacturonic acid polymer and glycerin form an ester substance as a connecting bridge to polymerize the pectin. Since pectin and glycerin are extracted from natural plants, they are degradable, non-polluting, and can be digested and degraded by the human body, so they are edible films, which can be used in fruit and food preservation to ensure food safety.

Compared with prior art, the present invention has following characteristics and advantage:

(1) The product of the present invention has good shear resistance and tensile strength.

(2) The raw materials of the present invention adopt common edible raw materials on the market-natural pectin and natural glycerin, and the source of raw materials is wide.

(3) The present invention adopts natural pectin edible material as main raw material, and by adding film-forming aids and controlling film-forming conditions, the preservative film directly made has oxygen-permeable, carbon-dioxide-permeable and water-vapour-permeable properties suitable for most foods. Performance, to achieve the purpose of freshness; at the same time, the production of fresh-keeping film is edible film, compared with polyethylene (PE) and polyvinylidene chloride (PVDC) film, easy to degrade, has excellent environmental protection characteristics, used as food preservation has Excellent security.

(4) The product of the present invention is a solid product. Compared with fruit and vegetable dipping, spraying or film coating, it is convenient to use and can be applied to fields such as fruit and vegetable fresh-keeping films and other food preservation.

(5) The preparation process of the present invention is simple and the cost is low.

(6) The edible preservative film prepared by the technique of the present invention is a novel preservative film, which has higher added value of science and technology, has a broad potential market, can greatly improve the value of agricultural and sideline products, and is beneficial to food safety and novel packaging. Material development research is of great significance and has high economic and social benefits.

Detailed ways

The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

Example 1

Add 100 parts by mass of banana pectin (produced by Zhengzhou Huakang Food Additive Co., Ltd.) and 900 parts by mass of deionized water into a reaction tank, and stir to form a pectin emulsion with a mass concentration of 10%. Add 10 parts by mass of glycerin (the glycerol is natural glycerin extracted from plants, produced by Guangzhou Nanjia Chemical Co., Ltd.), stir for 10 minutes, and keep warm at 75° C. for 60 minutes to obtain a compound pectin solution. Then put the compound pectin solution into the homogenizer, and disperse homogeneously at 3500rpm/min for 10min. Pour the dispersed compound pectin solution into 8ml compound pectin solution according to the ratio of ^1cm2 area, pour the homogenized compound pectin solution into the film forming device to form a film, dry it at 60°C, and uncover it after 12 hours film, the light transmittance is 84%, the tensile strength is 2700MPa, the elongation at break is 1.4%, the water vapor transmission rate is 20g/m ² ·24hr (25°C), and the oxygen transmission rate is 90ml/m ² ·d·atm (23°C), the carbon dioxide transmission rate is 1430ml/m ² ·d·atm (23°C) pectin plastic wrap for edible food.

Example 2

Add 200 parts by mass of citrus pectin (produced by Zhengzhou Huakang Food Additive Co., Ltd.) and 800 parts by mass of deionized water into the reaction tank, and stir to form a pectin emulsion with a mass concentration of 20%. Add 30 parts by mass of glycerin (the glycerol is natural glycerin extracted from plants, produced by Guangzhou Nanjia Chemical Co., Ltd.), stir for 10 minutes, and keep warm at 80° C. for 62 minutes to obtain a compound pectin solution. Then put the compound pectin solution into the homogenizer, and disperse homogeneously at 4000rpm/min for 12min. Pour the dispersed compound pectin solution into 8ml compound pectin solution according to the ratio of ^1cm2 area, pour the homogenized compound pectin solution into the film forming device to form a film, dry it at 60°C, and uncover it after 12 hours film, the light transmittance is 81%, the tensile strength is 2900MPa, the elongation at break is 1.6%, the water vapor transmission rate is 18g/m ² ·24hr (25°C), and the oxygen transmission rate is 80ml/m ² ·d·atm (23°C), the carbon dioxide transmission rate is 1380ml/m ² ·d·atm (23°C) pectin plastic wrap for edible food.

Example 3

Add 300 parts by mass of sunflower pectin (produced by Zhengzhou Huakang Food Additive Co., Ltd.) and 700 parts by mass of deionized water into the reaction tank, and stir to form a pectin emulsion with a mass concentration of 30%. Add 60 parts by mass of glycerin (the glycerol is natural glycerin extracted from plants, produced by Guangzhou Nanjia Chemical Co., Ltd.), stir for 10 minutes, and keep warm at 85° C. for 60 minutes to obtain a compound pectin solution. Then put the compound pectin solution into the homogenizer, and disperse homogeneously at 4500rpm/min for 15min. Pour the dispersed compound pectin solution into 8ml compound pectin solution according to the ratio of ^1cm2 area, pour the homogenized compound pectin solution into the film forming device to form a film, dry it at 65°C, and uncover it after 14 hours film, the light transmittance is 80%, the tensile strength is 3000MPa, the elongation at break is 1.8%, the water vapor transmission rate is 15g/m ² ·24hr (25°C), and the oxygen transmission rate is 60mL/m ² ·d·atm (23°C), the carbon dioxide transmission rate is 1300mL/m ² ·d·atm (23°C) pectin cling film for edible food.

Example 4

Add 150 parts by mass of sunflower pectin and 850 parts by mass of deionized water into the reaction tank, and stir to form a pectin emulsion with a mass concentration of 15%. Add 20 parts by mass of glycerin (the glycerol is natural glycerin extracted from plants, produced by Guangzhou Nanjia Chemical Co., Ltd.), stir for 10 minutes, and keep warm at 82° C. for 70 minutes to obtain a compound pectin solution. Then put the compound pectin solution into the homogenizer, and disperse homogeneously for 10 minutes at 3800rpm/min. Pour the dispersed compound pectin solution into 8ml compound pectin solution according to the ratio of ^1cm2 area, pour the homogenized compound pectin solution into the film forming device to form a film, dry it at 60°C, and uncover it after 12 hours film, the obtained light transmittance is 85%, the tensile strength is 2790MPa, the elongation at break is 1.51%, the water vapor transmission rate is 19g/m ² ·24hr (25°C), and the oxygen transmission rate is 85ml/m ² ·d·atm (23°C), the carbon dioxide transmission rate is 1410ml/m ² ·d·atm (23°C) pectin plastic wrap for edible food.

Example 5

Add 280 parts by mass of citrus pectin and 720 parts by mass of deionized water into the reaction tank, and stir to form a pectin emulsion with a mass concentration of 28%. Add 30 parts by mass of glycerin (the glycerol is natural glycerin extracted from plants, produced by Guangzhou Nanjia Chemical Co., Ltd.), stir for 10 minutes, and keep warm at 80° C. for 60 minutes to obtain a compound pectin solution. Then put the compound pectin solution into the homogenizer, and disperse homogeneously at 4000rpm/min for 10min. Pour the dispersed compound pectin solution into 8ml compound pectin solution according to the ratio of ^1cm2 area, pour the homogenized compound pectin solution into the film forming device to form a film, dry it at 63°C, and uncover it after 13 hours film, the obtained light transmittance is 82%, the tensile strength is 2870MPa, the elongation at break is 1.7%, the water vapor transmission rate is 16g/m ² ·24hr (25°C), and the oxygen transmission rate is 65ml/m ² ·d·atm (23°C), the carbon dioxide transmission rate is 1330ml/m ² ·d·atm (23°C) pectin plastic wrap for edible food.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations or Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (9)

1, a kind of edible food pectin preservative film is characterized in that: described edible food pectin preservative film set of dispense ratio is: pectin 100～300

Deionized water 700～900

Glycerine 10～60;

More than each component be the mass fraction meter.

2, edible food pectin preservative film according to claim 1, it is characterized in that: described edible food film light transmittance is 80～85%, tensile strength is 2700～3000MPa, and elongation at break is that 1.4～1.8%, 25 ℃ of following water vapour permeabilities are 15～20g/m ²24hr, 23 ℃ of following OTR oxygen transmission rates are 60～90ml/m ²Datm, 23 ℃ of carbon dioxide transmitances are 1300～1430ml/m ²Datm.

3, edible food pectin preservative film according to claim 1 is characterized in that: the natural glycerin of described glycerine for extracting from plant.

4, edible food pectin preservative film according to claim 1 is characterized in that: the natural pectin of described pectin for extracting from plant.

5, according to claim 1 or 4 described edible food pectin preservative films, it is characterized in that: described pectin is the natural pectin that extracts in the fruits and vegetables.

6, edible food pectin preservative film according to claim 5 is characterized in that: described pectin is banana pectin, citrus pectin or sunflower pectin.

7, the preparation method of the described edible food pectin preservative film of a kind of claim 1 is characterized in that may further comprise the steps:

(1) preparation of pectin emulsion: with 100～300 mass parts pectin and 700～900 mass parts deionized waters, dispersed with stirring becomes the pectin emulsion of mass concentration 10～30%;

(2) preparation of composite fruit glue: in above-mentioned pectin emulsion, add 10～60 mass parts glycerine and be incubated 60～70min down for 75～85 ℃, obtain the composite fruit glue;

(3) homogeneous: the composite fruit glue is disperseed 10～15min in 3500～4500rpm/min homogeneous;

(4) film forming: press 1cm ²Area is poured 8ml composite fruit glue ratio into, will pour film forming in the film forming device into through the composite fruit glue of homogeneous, and is dry under 60～65 ℃ of temperature, takes off film after 12～14 hours, obtains edible food pectin preservative film.

8, claim 1 or 2 described edible food pectin preservative films are applied to the food fresh keeping field.

9, claim 1 or 2 described edible food pectin preservative films are used as fruit freshness preserving film or fresh-keeping of vegetables film.