Method for extracting proanthocyanidin from banana peels
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A technology of proanthocyanidins and banana peels, applied in the direction of organic chemistry, to achieve the effect of high extraction rate, mild conditions and high yield
Inactive Publication Date: 2013-11-13
杨公明
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[0006] The purpose of the present invention is to overcome the defects of current pretreatment and extraction methods, and disclose a method for extracting proanthocyanidins from green banana peels
Method used
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Embodiment 1
[0020] a. Preparation: Remove the stems from the green bananas, remove the pulp and leave the banana peels;
[0021] b. Color protection: the color protection solution uses an aqueous color protection solution containing 0.05% sodium bisulfite, 0.1% vitamin C and 0.4% citric acid, and immerses the green banana peel in the color protection solution for 10 minutes;
[0022] c. Quick-freezing: place the banana peel after color protection in a tunnel freezer, freeze at -30°C for 20 minutes, and lower the temperature to -18°C to obtain iced banana peel;
[0023] d. Crushing: Set the temperature in the pulverizer cavity to 5-15°C, crush the iced banana peels into banana peel ice powder, and store them at low temperature for later use;
[0024] e. Microwave drying: place the banana peel ice powder in a tunnel-type microwave dense mesh low-temperature and low-dew-point hot air drying equipment for drying at a temperature of 50-60°C and reach a standard moisture content of 30% to make...
Embodiment 2
[0029] a. Preparation: Remove the stems from the green bananas, remove the pulp and leave the banana peels;
[0030] b. Color protection: The color protection solution uses an aqueous color protection solution containing 0.05% sodium bisulfite, 0.1% vitamin C and 0.4% citric acid, and immerses the green banana peel in the color protection solution for 12 minutes;
[0031] c. Quick freezing: place the banana peels after color protection in a tunnel freezer, freeze at -35°C for 30 minutes, and lower the temperature to -18°C to obtain iced banana peels;
[0032] d. Crushing: Set the temperature in the pulverizer cavity to -5-5°C, crush the iced banana peels into banana peel ice powder, and store them at low temperature for later use;
[0033] e. Microwave drying: Put the banana peel ice powder in the tunnel-type microwave dense mesh low-temperature and low-dew-point hot air drying equipment for drying at a temperature of 40~50°C and reach a standard moisture content of 30% to mak...
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Abstract
The invention discloses a method for extracting proanthocyanidin from banana peels. The method comprises the following steps of: banana peel extraction; color protection; quick freezing; smashing; microwave drying; ionic liquid extraction; ultracentrifugation; and spray drying to obtain a finished product of the proanthocyanidin. By utilizing quick freezing and low-temperature smashing technologies, the banana peels can be smashed uniformly and are small in particle size, low in proanthocyanidin loss and high in drying speed, and a sterilizing effect can also be realized while the banana peels are dried and dehydrated; the proanthocyanidin is prevented from being damaged by using a microwave-assisted ionic liquid extracting method; and the ionic liquid is easy to recycle. The method is simple in operation, mild in condition, high in yield and efficiency, clean and harmless in production process, low in energy consumption, high in benefit, high in yield and purity of the proanthocyanidin, suitable for large-scale production and application, and wide in prospects for comprehensive utilization of the banana peels and the commercialized market development of natural proanthocyanidin.
Description
technical field [0001] The invention relates to a method for extracting plant proanthocyanidins, in particular to a method for extracting proanthocyanidins from green banana peels by using microwave-assisted ionic liquids, and belongs to the field of agricultural product processing. Background technique [0002] Banana is a tropical and subtropical characteristic fruit, and it is also a food crop in more than 40 countries in the world. Banana resources are abundant and the output is huge. In 2010, the annual output of bananas in my country exceeded 9 million tons. With the adjustment of my country's agricultural industrialization structure and the rapid development of the banana deep processing industry, a large number of banana peels have not been utilized in the deep processing of bananas. Banana peel contains various nutrients such as sugars, phenols, lipids, organic acids, condensed tannins, and proteins. It is also rich in various vitamins and inorganic salts. The cont...
Claims
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