Technology of chitosan microsphere clear pineapple juice

Abstract

The invention discloses a technology of chitosan microsphere clear pineapple juice. The technology comprises the following steps of (1) preparing pineapple juice: peeling pineapples, removing black bulges, cutting the peeled pineapples without black bulges into pineapple dices, putting the pineapple dices into immersion liquid, performing ultrasonic treatment under the condition of frequency being 100-200Hz for 20-30min, taking out the pineapple dices after the ultrasonic treatment, putting the taken-out pineapple dices into a wall breaking machine, adding sterile water, performing stirring at the speed of 30000-45000r / min for 10-15min, and performing filtration through an ultra filtration membrane so as to obtain filtrate namely the pineapple juice; (2) treating the chitosan microsphere clear pineapple juice: enabling the pineapple juice to flow through chromatographic columns at the speed of 0.2-0.5L / min, wherein chitosan microspheres are used as stuffings of the chromatographic columns, the temperature of the chromatographic columns is 5-7 DEG C, and collecting filtrate namely clear pineapple juice; and (3) cleaning the chitosan microspheres. The pineapple juice prepared through the technology disclosed by the invention is a healthy nutrient beverage which is clear, transparent, rich in nutrition and low in agricultural chemical residues, and has high market popularization value.

Description

[0001]

Technical field

[0002] The invention relates to the field of preparation technology of pineapple juice, in particular to a technology for clarifying pineapple juice with chitosan microspheres.

[0003]

Background technique

[0004] Pineapple, commonly known as pineapple, is one of the famous tropical fruits. Pineapple fruit is of good quality and rich in nutrition, containing a lot of fructose, glucose, vitamin B, C, phosphorus, citric acid and protease and other substances. Pineapple is rich in protein, fat, fiber, niacin, potassium, sodium, zinc, carbohydrates, calcium, phosphorus, iron, carotene, thiamine, riboflavin and vitamin C, and also contains a variety of organic acids and pineapple enzymes etc. Bromelain, one of the pineapple enzymes, can stimulate and catalyze biochemical changes. People will have allergies after eating, such as numbness in the mouth, abdominal pain, dizziness, etc. Therefore, in the process of preparing pineapple juice, it is necessar...

Examples

Embodiment 1

[0033] 1. Preliminary preparation:

[0034] The preparation of chitosan metal complex solution: in parts by weight, after mixing 5 parts of zinc acetate, 1 part of copper acetate, 5 parts of chitosan and 120 parts of acetic acid solution with a mass fraction of 3%, at a temperature of 35 ℃, a stirring speed of 200r / min and an infrared irradiation power of 150W for 30min to obtain a chitosan metal complex solution.

[0035] Preparation of chitosan microspheres: In parts by weight, 20 parts of ferric chloride and 200 parts of deionized water are put into the reactor, rapidly heated to 85° C. under nitrogen protection, and then stirred at 200 r / min Under the condition of 10% mass fraction of sodium hydroxide solution was added dropwise until no precipitation occurred, then 40 parts of chitosan metal complex solution was added, and the reaction was continued for 60 minutes. After microfiltration, the filter residue was washed with ethanol and dried. To obtain chitosan microsphere...

Embodiment 2

[0043] 1. Preliminary preparation:

[0044] The preparation of chitosan metal complex solution: in parts by weight, after mixing 6 parts of zinc acetate, 1.2 parts of copper acetate, 7 parts of chitosan and 120 parts of acetic acid solution with a mass fraction of 3%, at a temperature of 38 ℃, a stirring speed of 250r / min and an infrared irradiation power of 200W for 40min to obtain a chitosan metal complex solution.

[0045] Preparation of chitosan microspheres: in parts by weight, 28 parts of ferric chloride and 245 parts of deionized water are put into the reactor, heated rapidly to 89°C under nitrogen protection, and then heated at a stirring speed of 300r / min Under the condition that the mass fraction is 13% sodium hydroxide solution is added dropwise until no precipitation occurs, then 45 parts of chitosan metal complex solution is added, and the reaction is continued for 70 minutes. After microfiltration, the filter residue is washed with ethanol and dried. To obtain c...

Embodiment 3

[0053] 1. Preliminary preparation:

[0054] The preparation of chitosan metal complex solution: in parts by weight, after mixing 8 parts of zinc acetate, 1.3 parts of copper acetate, 6 parts of chitosan and 120 parts of acetic acid solution with a mass fraction of 3%, at a temperature of 36 ℃, a stirring speed of 370r / min and an infrared irradiation power of 270W for 50min to obtain a chitosan metal complex solution.

[0055] Preparation of chitosan microspheres: In parts by weight, 26 parts of ferric chloride and 280 parts of deionized water are put into the reactor, heated rapidly to 86°C under nitrogen protection, and then stirred at 360r / min Under the conditions of 15% mass fraction of sodium hydroxide solution was added dropwise until no precipitation occurred, then 53 parts of chitosan metal complex solution was added, and the reaction was continued for 67 minutes. After microfiltration, the filter residue was washed with ethanol and dried. To obtain chitosan microspher...

[0001]

Technical field

[0002] The invention relates to the field of preparation technology of pineapple juice, in particular to a technology for clarifying pineapple juice with chitosan microspheres.

[0003]

Background technique

[0004] Pineapple, commonly known as pineapple, is one of the famous tropical fruits. Pineapple fruit is of good quality and rich in nutrition, containing a lot of fructose, glucose, vitamin B, C, phosphorus, citric acid and protease and other substances. Pineapple is rich in protein, fat, fiber, niacin, potassium, sodium, zinc, carbohydrates, calcium, phosphorus, iron, carotene, thiamine, riboflavin and vitamin C, and also contains a variety of organic acids and pineapple enzymes etc. Bromelain, one of the pineapple enzymes, can stimulate and catalyze biochemical changes. People will have allergies after eating, such as numbness in the mouth, abdominal pain, dizziness, etc. Therefore, in the process of preparing pineapple juice, it is necessar...

Examples

Embodiment 1

[0033] 1. Preliminary preparation:

[0034] The preparation of chitosan metal complex solution: in parts by weight, after mixing 5 parts of zinc acetate, 1 part of copper acetate, 5 parts of chitosan and 120 parts of acetic acid solution with a mass fraction of 3%, at a temperature of 35 ℃, a stirring speed of 200r / min and an infrared irradiation power of 150W for 30min to obtain a chitosan metal complex solution.

[0035] Preparation of chitosan microspheres: In parts by weight, 20 parts of ferric chloride and 200 parts of deionized water are put into the reactor, rapidly heated to 85° C. under nitrogen protection, and then stirred at 200 r / min Under the condition of 10% mass fraction of sodium hydroxide solution was added dropwise until no precipitation occurred, then 40 parts of chitosan metal complex solution was added, and the reaction was continued for 60 minutes. After microfiltration, the filter residue was washed with ethanol and dried. To obtain chitosan microsphere...

Embodiment 2

[0043] 1. Preliminary preparation:

[0044] The preparation of chitosan metal complex solution: in parts by weight, after mixing 6 parts of zinc acetate, 1.2 parts of copper acetate, 7 parts of chitosan and 120 parts of acetic acid solution with a mass fraction of 3%, at a temperature of 38 ℃, a stirring speed of 250r / min and an infrared irradiation power of 200W for 40min to obtain a chitosan metal complex solution.

[0045] Preparation of chitosan microspheres: in parts by weight, 28 parts of ferric chloride and 245 parts of deionized water are put into the reactor, heated rapidly to 89°C under nitrogen protection, and then heated at a stirring speed of 300r / min Under the condition that the mass fraction is 13% sodium hydroxide solution is added dropwise until no precipitation occurs, then 45 parts of chitosan metal complex solution is added, and the reaction is continued for 70 minutes. After microfiltration, the filter residue is washed with ethanol and dried. To obtain c...

Embodiment 3

[0053] 1. Preliminary preparation:

[0054] The preparation of chitosan metal complex solution: in parts by weight, after mixing 8 parts of zinc acetate, 1.3 parts of copper acetate, 6 parts of chitosan and 120 parts of acetic acid solution with a mass fraction of 3%, at a temperature of 36 ℃, a stirring speed of 370r / min and an infrared irradiation power of 270W for 50min to obtain a chitosan metal complex solution.

[0055] Preparation of chitosan microspheres: In parts by weight, 26 parts of ferric chloride and 280 parts of deionized water are put into the reactor, heated rapidly to 86°C under nitrogen protection, and then stirred at 360r / min Under the conditions of 15% mass fraction of sodium hydroxide solution was added dropwise until no precipitation occurred, then 53 parts of chitosan metal complex solution was added, and the reaction was continued for 67 minutes. After microfiltration, the filter residue was washed with ethanol and dried. To obtain chitosan microspher...

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