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A technology of pectin and acid hydrolysis, which is applied in the direction of digestive system, metabolic diseases, antineoplastic drugs, etc., can solve the problems of discarding and waste of resources, and achieve the effects of simple operation, environmental pollution and high extraction rate
Inactive Publication Date: 2012-05-09
冯捷
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[0003] Citrus is a plant of the genus Citrus Rutaceae. No matter whether citrus is eaten fresh or processed, the peel is its main by-product. Citrus peel accounts for about 20% of the whole fruit weight. In addition to water, cellulose and lignin, it is also rich in pigments, fruit Glue, etc. At present, most of the orange peels in our country are discarded without any treatment, resulting in a great waste of resources
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preparation example Construction
[0015] The preparation method of the present invention is:
[0016] 1. Raw material pretreatment
[0017] Take fresh citrus peels, chop them to a particle size of 2-3 mm, heat-treat in boiling water for 5 minutes to inactivate pectinase, soak in 70% ethanol for 30 minutes, the ratio of solid to liquid is 1:15-1:20, and the pH is 0.1-2.0, 70 Maintain at ~90°C for 5 minutes, press filter, remove pigments and other alcohol-soluble impurities, wash the residue with 95% ethanol, and then wash with ether to avoid the loss of water-soluble pectin, air-dry ether, and dry at 45°C to constant weight;
[0018] 2. Acid hydrolysis extraction
[0019] Add hydrochloric acid solution to the pretreated raw materials, heat in a constant temperature water bath, shake well, and centrifuge until the supernatant is not viscous. The extraction temperature is 70-90°C, and the extraction time is 60-120 minutes. The supernatant is Pectin extract, dilute the supernatant to 100mL.
Embodiment 1
[0020] Example 1: The ratio of solid to liquid is 1:20, the pH is 0.1, the extraction temperature is 70° C., the extraction time is 120 min, and the extraction rate is 20.45%.
Embodiment 2
[0021] Example 2: The solid-liquid ratio is 1:15, the pH is 2.0, the extraction temperature is 80° C., the extraction time is 60 min, and the extraction rate is 21.68%.
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Abstract
The invention relates to a pectin preparation method, belonging to the field of food processing and in particular relating to the pectin preparation method with low cost and high extraction rate. The preparation method comprises: 1, pretreatment of raw materials: taking fresh orange peel, chopping the orange peel until the particle size is 2-3mm, carrying out thermal treatment on the orange peel for 5 min in boiling water to deactivate pectinase, soaking the orange peel for 30 min in 70 percent of ethanol, keeping the orange peel for 5 min at 70-90 DEG C, carrying out pressure filtration to remove pigments and other impurities soluble in alcohol, washing residues with 95 percent of ethanol and then washing with ethyl ether, minimizing the loss of water-soluble pectin, air-cooling the ethyl ether, and drying at 45 DEG C until the constant weight is achieved; and 2, acid hydrolysis and extraction: adding hydrochloric acid solution into the pretreated raw materials, heating the mixture in a constant-temperature water bath, mixing well, and centrifuging until the supernatant is not sticky, and fixing the volume of the supernatant, i.e. pectin extract, to be 100ml.
Description
Technical field: [0001] The invention belongs to the field of food processing, and more specifically relates to a preparation method of pectin. Background technique: [0002] Pectin is a high molecular polymer, widely present in the cell wall and interstitium of higher plants, usually white or light yellow powder, odorless, slightly sweet, slightly sour, insoluble in ethanol, methanol and other organic solvents, Soluble in hot water, slightly soluble in cold water. Pectin has become an important additive in the food industry due to its excellent gelling and emulsifying stability, and has been widely used in foods such as jam, jelly, candy, lactic acid and fruit juice drinks. In recent years, pectin, as a soluble dietary fiber, has the functions of anti-diarrhea, anti-cancer, and treatment of diabetes, and its application range has been continuously expanded. In addition, pectin is also an indispensable auxiliary raw material in some medicines, health products and cosmetics...
Claims
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