Method for extracting melanin from sweet osmanthus peel and application of extracted melanin
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A technology for melanin and peel, applied in the field of melanin extraction, can solve the problems of less research on melanin extraction, and achieve the effects of short extraction period, low oxidation degree, and high content and purity
Inactive Publication Date: 2018-04-13
HUBEI UNIV OF SCI & TECH
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Related studies have reported that osmanthus peel contains melanin,...
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Embodiment 2
[0040] Adopt the method for the embodiment of the present invention one to get sweet-scented osmanthus pericarp and carry out melanin extraction, comprise the following steps:
[0041] (1) Dry the clean sweet-scented osmanthus peel with microwave for 9 minutes, pulverize it, and pass through a 100-mesh sieve to obtain a fine powder;
[0042](2) Get 5.0g sweet-scented osmanthus peel powder and put it into a 150ml Erlenmeyer flask, add 50ml 20% ammonia solution, extract through microwave 700w radiation for 100s, put the extracted Erlenmeyer flask into a 60°C water bath for 1.5 hours and take it out , cooling the extract;
[0043] (3) The extract is coarsely filtered with double-layer gauze, and the filtrate is centrifuged for 15 minutes under a relative centrifugal force of 15000g to obtain a supernatant, and 50ml of deionized water is added to the supernatant and mixed evenly, adjusted with 1mol / L hydrochloric acid The pH value is 1-2, let it stand for 24 hours to completely p...
Embodiment 3
[0094] The embodiment of the present invention also provides the application of the melanin extracted by the method of the first and second embodiments.
[0095] The embodiment of the present invention also provides a melanin hair dye, which is composed of melanin, ethanol, polyethylene glycol, guar gum, ferrous sulfate, deionized water, propylene glycol and a pH regulator. The pH value of the hair dye is adjusted to be neutral, and the stability test of the melanin hair dye is carried out, including the test of the stability of the melanin hair dye by temperature, pH value and light time.
[0096] Take 6 parts of the same amount of melanin hair dye and heat them in a vacuum drying oven at 20, 30, 40, 50, 60, and 70°C, take out and cool to room temperature at a time interval of 0.5h, and calculate the different temperatures by measuring the ABS value And the degree of thermal degradation of melanin hair dye under the heating time, the results are shown in 8.
[0097] Absorban...
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Abstract
The invention discloses a method for extracting melanin from sweet osmanthus peel and application of the extracted melanin. The method comprises the following steps: with sweet osmanthus peel as a rawmaterial, subjecting the sweet osmanthus peel to microwave drying and crushing, microwave radiation, extraction with an alkaline aqueous solution, acid hydrolysis of impurities, repeated washing withan organic solvent and repeated alkali dissolving; then carrying out acidifying to realize precipitation; carrying out purifying, and repeatedly washing a purified product with deionized water to remove Cl<->; and finally, carrying out freeze drying so as to obtain a pure melanin product. The method is simple to operate and can realize large-scale preparation. The prepared melanin has good stability at a temperature below 100 DEG C, less proneness to influence by the pH value and strong oxidation resistance; metal ions have little influence on the stability of the melanin; sugar/amino acid/organic acid has no obvious effect on the melanin and exerts certain color-enhancing effect; the melanin is applicable to most foodstuffs and has strong salt tolerance and high purity; and when the extracted melanin is applied to hair dyes, the melanin has good stability and can be extensively applied to hair dyeing.
Description
technical field [0001] The invention relates to the technical field of plant melanin production, in particular to a method for extracting melanin from sweet-scented osmanthus peel and its application. Background technique [0002] Melanin is usually an amorphous and heterogeneous macromolecular substance, and its composition is not only related to the monomer unit, but also related to the environmental conditions during the polymerization process. In addition to being a pigment, melanin also has a variety of biological functions, such as: providing structural strength for organisms; anti-radiation; shielding photoreceptors and maintaining body temperature balance; functioning as a chemical protective pigment, Protect living organisms from antibiotics or other drugs and toxic substances such as heavy metals; absorb, maintain, store and convert energy. [0003] Osmanthus fragrans has another name called sweet-scented osmanthus, rock osmanthus, Jiulixiang, golden millet. Belo...
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