Method for extracting pectin from pineapple peel assisted by ultrasonic wave

A pineapple peel and ultrasonic technology, applied in the field of natural product extraction, can solve problems such as environmental pollution and waste of resources, and achieve the effect of improving the extraction rate and reducing the price of raw materials

Inactive Publication Date: 2011-01-12
李浩贤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In Zhanjiang, Guangdong alone, 400,000 to 500,000 tons of pineapple peels are not ful...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Wash the pineapple peel, boil it with water for 20 minutes, rinse the boiled pineapple peel with cold water, put it in a cloth bag and squeeze it, then add it to the citric acid aqueous solution with a pH value of 4.7, the ratio of solid to liquid is 1:7, and the frequency is 20kHz response to ultrasonic radiation. After the reaction is completed, filter the nylon cloth while it is hot, add 2.6% activated carbon in mass ratio to the filtrate, and stir at 80° C. for decolorization. After filtering, the filtrate is heated and concentrated to 20% of the original solution, taken out, allowed to stand and cooled to room temperature, and absolute ethanol is added under the condition of stirring, and the pectin precipitates out in the form of flocculation. After filtering, the precipitate was washed with absolute ethanol and dried in vacuum to obtain pectin.

Embodiment 2

[0013] Wash the pineapple skin, boil it with water for 60 minutes, rinse the boiled pineapple skin with cold water, put it in a cloth bag and press it, then add it to the sulfuric acid aqueous solution with a pH value of 3.2, the ratio of solid to liquid is 1:12, and the frequency is 40kHz. Reaction under ultrasonic radiation. After the reaction is completed, filter the nylon cloth while it is hot, add 1.5% activated carbon by mass to the filtrate, and stir at 74° C. for decolorization. After filtering, the filtrate is heated and concentrated to 18% of the original solution, taken out, allowed to stand and cooled to room temperature, and absolute ethanol is added under the condition of stirring, and the pectin precipitates out in the form of flocculation. After filtering, the precipitate was washed with absolute ethanol and dried in vacuum to obtain pectin.

Embodiment 3

[0015] Wash the pineapple peel, boil it with water for 34 minutes, rinse the boiled pineapple peel with cold water, put it in a cloth bag and squeeze it, then add it to the acetic acid aqueous solution with a pH value of 5.2, the ratio of solid to liquid is 1:16, and the frequency is 20kHz. Reaction under ultrasonic radiation. After the reaction is completed, filter the nylon cloth while it is hot, add 8.0% activated carbon by mass to the filtrate, and stir at 68° C. for decolorization. After filtering, the filtrate is heated and concentrated to 19% of the original solution, taken out, allowed to stand and cooled to room temperature, and absolute ethanol is added while stirring, and the pectin precipitates out in the form of flocculation. After filtering, the precipitate was washed with absolute ethanol and dried in vacuum to obtain pectin.

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Abstract

The invention relates to a method for extracting pectin from pineapple peels assisted by ultrasonic waves, which is characterized by comprising the following steps of: carrying out processing procedures of washing, boiling, rinsing, pressing and dewatering and the like on discarded pineapple peels, mixing with a water solution with the pH value of 1.0-6.0 and placing into an ultrasonic wave container, controlling a material liquid ratio to be 1:3-30 and the temperature to be 25-100 DEG C, and reacting under the action of ultrasonic wave radiations with frequency of 20-40 kHz; and after completing the reaction, carrying out processes of decoloring through active carbon, concentrating, ethanol-precipitating and vacuum drying and the like to obtain the pectin. The invention can shorten the extraction time of the pectin through the impact effect of the ultrasonic wave on cell walls of the pineapple peels and improve the yield of the pectin.

Description

Technical field: [0001] The invention belongs to the field of natural product extraction, and in particular relates to an ultrasonic-assisted method for extracting pectin from pineapple peels discarded during pineapple processing. Background technique: [0002] Pineapple belongs to the genus Bromelia, Bromeliaceae, also known as pineapple, which is planted in large areas in Guangdong, Guangxi, and Hainan in my country. In 2004, the world's pineapple output has exceeded 15 million tons. Pineapple fruit is not resistant to storage. Currently, it is mainly sold fresh, and its shelf life is very short when it is fully mature. Pineapple processed products mainly include canned pineapple in syrup, pineapple jam and pineapple preserves. In the process of pineapple processing, the processing by-product——pineapple skin accounts for about 50-60% of the total weight of the whole fruit, and it has become a serious source of environmental pollution because of the lack of effective value...

Claims

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Application Information

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IPC IPC(8): C08B37/06
Inventor 李浩贤
Owner 李浩贤
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