Preparation method of sweet potato stem-leaf extract
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A technology for sweet potato stems and leaves and extracts, which is applied in the field of extracting effective components from sweet potato stems and leaves, and achieves the effects of avoiding waste, saving drying time and achieving continuity
Inactive Publication Date: 2012-10-03
INST OF AGRO FOOD SCI & TECH SHANDONG ACAD OF AGRI SCI
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Problems solved by technology
[0009]Sweet potato stems and leaves contain so many beneficial substances, how to extract these useful ingredients as much as possible is a difficult problem, and there are few related to report
Method used
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Embodiment 1
[0030] A preparation method of sweet potato stem and leaf extract, comprising the following steps:
[0031] (1) Freeze-drying and crushing: Freeze the washed fresh sweet potato stems and leaves at -35-45°C, then vacuum-dry them at 25°C-40°C to make the water content 2.5%, and crush them into 60-100 mesh particles;
[0032] (2) Extraction: Add 5 times the weight of the extractant ethanol for extraction, while stirring, extract 5 times, combine the extracts, and concentrate to a density of 1.0g / mL;
[0033] (3) Dry using conventional drying means.
Embodiment 2
[0035] A preparation method of sweet potato stem and leaf extract, comprising the following steps:
[0036] (1) Freeze-drying and crushing: Freeze the washed fresh sweet potato stems and leaves at -35-45°C, then vacuum-dry them at 25°C-40°C to keep the water content below 3%, and crush into 60 ~ 100 mesh particles;
[0037] (2) Extraction: add 10 times the weight of the extractant acetone for extraction, stir at the same time, extract 3 times, combine the extracts, and concentrate to a density of 1.5g / mL;
[0038] (3) Dry using conventional drying means.
Embodiment 3
[0040] A preparation method of sweet potato stem and leaf extract, comprising the following steps:
[0041] (1) Freeze-drying and crushing: Freeze the washed fresh sweet potato stems and leaves at -35-45°C, then vacuum-dry them at 25°C-40°C to keep the water content below 3%, and crush into 20-60 mesh particles;
[0042] (2) Extraction: add 10 times the weight of the extractant ethanol for extraction, and stir at the same time, extract 3 times, combine the extracts, and concentrate to a density of 1.5g / mL;
[0043] (3) Use belt-type vacuum drying for drying. The drying conditions are: first drying zone, temperature 80-95°C, pressure -0.07-0.085 MPa, time 5-8 minutes; second drying zone, temperature 50-80°C , the pressure is -0.05 ~ 0.075 MPa, the time is 50 ~ 100 minutes; the cooling zone, the temperature is 0 ~ 25 ° C, the pressure is -0.07 ~ 0.08 MPa, the time is 15 ~ 25 minutes.
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Abstract
The invention relates to the technical field of extraction of active ingredients of sweet potato stems and leaves, in particular to a preparation method of a sweet potato stem-leaf extract. The preparation method comprises the steps of freezing stems and leaves of sweet potatoes under the condition of minus 35 to minus 45 DEG C, carrying out vacuum drying on the frozen stems and leaves at the temperature of 25 to 40 DEG C to ensure that the water content is lower than 3 percent, and pulverizing the stems and the leaves; extracting the stems and leaves by adding an extracting agent for 3 to 5 times, mixing the extract liquid, and concentrating the mixed liquid until the density of 1.0 to 1.5g / mL; and drying. The process for extracting the stems and leaves after being frozen is adopted, a high extraction rate can be reached, waste of beneficial resources can be avoided, and construction of an economizing-type society and a low-carbon society can be facilitated; the entire process flow is conducted under the low-temperature condition, ingredients which are easy to decompose can be effectively protected, the content of the active ingredients can be improved, and the product purity can be improved; and the obtained extract is dried by adopting a belt-type vacuum drying way, so that not only are the active ingredients uneasy to damage under the low temperature, but also the continuity of the entire process is realized, the drying time is saved, and the resources are saved.
Description
[0001] technical field [0002] The invention relates to the technical field of extraction of active ingredients from sweet potato stems and leaves, in particular to a preparation method of sweet potato stems and leaves extract. Background technique [0003] At present, there are many researches on the development of sweet potato tubers and their products at home and abroad, but the analysis and research on sweet potato stems and leaves and the development of health food have just started. Sweet potato stems and leaves contain a variety of bioactive components, which can be used as traditional Chinese medicine to treat various diseases. Sweet potato stems and leaves have strong stress resistance, wide adaptability, less pollution, high yield, fast growth, and less pests and diseases, and the use of pesticides is very low, so it is an ideal pollution-free vegetable. [0004] The medical field has listed sweet potato as an anti-cancer vegetable, and nutritionists call it "...
Claims
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Application Information
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Patent Type & Authority Applications(China)
IPC IPC(8): A23L1/30
Inventor 王文亮韩伟弓志青程安玮刘晓靳琼徐同成刘丽娜潘运国
Owner INST OF AGRO FOOD SCI & TECH SHANDONG ACAD OF AGRI SCI
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