阅读说明：本技术 一种香蕉皮水不溶性膳食纤维的制备方法 (Preparation method of banana peel water-insoluble dietary fiber ) 是由 谭丽燕 于 2019-11-29 设计创作，主要内容包括：本发明涉及一种香蕉皮水不溶性膳食纤维的制备方法,属于农产品加工领域；具体是以香蕉皮为原料,经预处理、粉碎、干燥、碱处理、酸中和等工艺后制得香蕉皮水不溶性膳食纤维,实现香蕉皮的合理利用,变废为宝、保护环境,还能提升附加值,提升经济效益。(The invention relates to a preparation method of banana peel water-insoluble dietary fiber, belonging to the field of agricultural product processing; the banana peel water-insoluble dietary fiber is prepared by using banana peel as a raw material through the processes of pretreatment, crushing, drying, alkali treatment, acid neutralization and the like, so that the banana peel is reasonably utilized, waste is turned into wealth, the environment is protected, the additional value can be increased, and the economic benefit is increased.)

1. A preparation method of banana peel water-insoluble dietary fiber is characterized by comprising the following steps: the method comprises the following steps:

(1) pretreatment: selecting, cleaning and pre-freezing banana peels;

(2) and (3) freeze drying: carrying out vacuum freeze drying on the pretreated banana peel;

(3) crushing: crushing the freeze-dried banana peels by using a crusher, and sieving by using a 40-mesh sieve;

(4) alkali treatment: weighing banana peel dry powder, putting the banana peel dry powder into a bottle with a cover, and adding NaOH solution, wherein the material-liquid ratio is 2: 50 g/mL;

(5) ultrasonic: putting the bottle into an ultrasonic cleaning instrument for ultrasonic treatment for 30 min;

(6) water bath: putting the sample subjected to ultrasonic treatment into a water bath kettle at 61 ℃ for water bath for 90 min;

(7) adding acid for neutralization: after the water bath is finished and the mixture is taken out, hydrochloric acid is dripped into a bottle to adjust the pH value to about 7.0;

(8) centrifuging: pouring the liquid in the bottle into a centrifuge tube, putting the centrifuge tube into a centrifuge, and centrifuging at room temperature;

(9) and (3) decoloring: pouring off the filtrate, adding 2-3 times of volume of absolute ethyl alcohol into the filter residue for decoloring for 3 hours, and washing and filtering for 3 times by using normal saline;

(10) and (3) finished product: taking out the filter residue, placing in tinfoil, and drying in an electrothermal blowing dry box until the weight is constant to obtain the water-insoluble dietary fiber of banana peel.

2. The method for preparing water-insoluble dietary fiber of banana peel according to claim 1, wherein the method comprises the following steps: and (4) adopting a NaOH solution of 12% in the alkali treatment.

3. The method for preparing water-insoluble dietary fiber of banana peel according to claim 1, wherein the method comprises the following steps: the concentration of the hydrochloric acid in the step (7) is 5 mol/L.

4. The method for preparing water-insoluble dietary fiber of banana peel according to claim 1, wherein the method comprises the following steps: the centrifugation condition in the step (7) is 5000 r/min and 6 min.

5. The method for preparing water-insoluble dietary fiber of banana peel according to claim 1, wherein the method comprises the following steps: the drying condition in the step (10) is 50 ℃ and 4-5 h.

Technical Field

The invention relates to a preparation method of banana peel water-insoluble dietary fiber, and belongs to the field of agricultural product processing.

Background

Bananas are one of the four fruits in the world, have fragrant smell, soft and greasy meat, and are tasty and sweet, so the bananas are popular in tropical and subtropical regions. FAO data show that the annual production of bananas around the world is 8000 million t in recent years, and in china, one of the origins of bananas, planting of bananas has been over 3000 years old, and has become the second world banana producing country since 2011. "Tianbao banana" is a traditional famous fruit produced in Zhangzhou city of Fujian province, has a history of over 1300 years, is also a famous and high-quality agricultural product and Chinese green food of Fujian province, has the characteristics of moderate size, thin peel, soft and smooth meat quality, fresh and sweet taste, no fiber core in pulp, strong fragrance and the like, is praised as a natural health-care food, and is sold abroad for a long time.

The banana peel is a byproduct of banana processing and utilization, has rich yield and low price, contains starch, water-soluble saccharides, protein, fatty acid, multiple vitamins, mineral substances and inorganic salt, also contains a large amount of active phenols, water-soluble and water-insoluble dietary fibers, has various biological effects of oxidation resistance, bacteriostasis, tumor resistance and the like, and is a typical 'oxidation resistant dietary fiber'. If the method can be reasonably utilized, not only can waste be changed into valuable, the environment is protected, but also the added value and the economic benefit are improved.

The invention provides a preparation method of banana peel water-Insoluble dietary fiber, which is characterized in that the banana peel water-Insoluble dietary fiber with strong oxidation resistance, good water retention and high expansion rate is obtained by optimizing an extraction process of the banana peel water-Insoluble Dietary Fiber (IDF), and is not reported in the industry at present. The invention is expected to lay a foundation for the research and development and application of the banana skin dietary fiber.

Disclosure of Invention

The invention aims to develop a preparation method of banana peel water-insoluble dietary fiber, and particularly relates to banana peel water-insoluble dietary fiber prepared by using banana peel as a raw material through the processes of pretreatment, crushing, drying, alkali treatment, acid neutralization and the like, so that a foundation is laid for research and development of banana peel dietary fiber, reasonable utilization of banana peel is realized, waste is turned into wealth, the environment is protected, the additional value can be increased, and the economic benefit is increased.

In order to achieve the purpose, the invention adopts the technical scheme that:

a preparation method of banana peel water-insoluble dietary fiber comprises the following steps:

(1) pretreatment: selecting, cleaning and pre-freezing banana peels;

(2) and (3) freeze drying: carrying out vacuum freeze drying on the pretreated banana peel;

(3) crushing: crushing the freeze-dried banana peels by using a crusher, and sieving by using a 40-mesh sieve;

(4) alkali treatment: weighing banana peel dry powder, putting the banana peel dry powder into a bottle with a cover, and adding a 12% NaOH solution, wherein the material-liquid ratio is 2: 50 g/mL;

(5) ultrasonic: putting the bottle into an ultrasonic cleaning instrument for ultrasonic treatment for 30 min;

(6) water bath: putting the sample subjected to ultrasonic treatment into a water bath kettle at 61 ℃ for water bath for 90 min;

(7) adding acid for neutralization: after the water bath is finished and the mixture is taken out, hydrochloric acid (5 mol/L) is dripped into the bottle to adjust the pH value to about 7.0;

(8) centrifuging: pouring the liquid in the bottle into a centrifuge tube, putting the centrifuge tube into a centrifuge (5000 r/min, 6 min), and centrifuging at room temperature;

(9) and (3) decoloring: pouring off the filtrate, adding 2-3 times of volume of absolute ethyl alcohol into the filter residue for decoloring for 3 hours, and washing and filtering for 3 times by using normal saline;

(10) and (3) finished product: and taking out filter residues, placing the filter residues in tinfoil, and drying the filter residues in an electric heating forced air drying oven (at the temperature of 50 ℃ for 4-5 hours) until the weight is constant, thus obtaining the banana peel water-insoluble dietary fiber.

The invention has the following advantages:

the banana peel water-insoluble dietary fiber developed and obtained by the invention has strong oxidation resistance, good water binding capacity and high expansion rate, and the banana peel is reasonably utilized, so that the waste is turned into wealth, the environment is protected, the additional value can be improved, and the economic benefit is improved.

Detailed Description

The present invention is further illustrated in detail by the following examples, which are provided only for illustrating the present invention and are not intended to limit the scope of the present invention.