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A kind of method for extracting tannin from tang pear

A technology of tannic acid and Tangli, which is applied in the field of tannic acid extraction, can solve the problems of complex tannic acid extraction process and low extraction purity, and achieve the effect of simple extraction means and good operation reproducibility

Active Publication Date: 2022-07-08
INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for extracting tannic acid from Tang pear to solve the problems of complex extraction process and low extraction purity of existing tannic acid

Method used

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  • A kind of method for extracting tannin from tang pear
  • A kind of method for extracting tannin from tang pear
  • A kind of method for extracting tannin from tang pear

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Weigh 6 parts of about 1.67g of Tangli powder into 6 identical conical flasks, respectively, add 100mL of ethanol solutions of different concentrations (ethanol concentrations are 0%, 25%, 50%, 70%, 90%, 100%) ), cover with a glass slide, and perform ultrasonic extraction at 50 °C and 32 kHz for 30 min, transfer the extracted solution to a centrifuge tube, centrifuge at 4000 r / min for 5 min, and filter the supernatant to a 100 mL tube to constant volume For spare use, take 1 mL of the extract for color development to measure the absorbance, and obtain six groups of data absorbance A1, A2, A3, A4, A5, and A6, such as figure 1 shown.

[0039] Depend on figure 1 It can be seen that when the ethanol concentration is between 0-50%, the tannin extraction rate increases with the increase of the ethanol concentration. When the ethanol concentration is 50%, the tannin extraction rate is the largest, and the tannin extraction rate is 1.19%; when the ethanol concentration is gre...

Embodiment 2

[0041] Weigh 6 parts of about 1.67g of tangli powder into 6 identical conical flasks, add 100 mL of 50% ethanol solution to each, cover with glass slides, and mark the 6 samples as 1# and 2# respectively. , 3#, 4#, 5#, 6#. 1# and 2# were placed in an electric heating constant temperature water bath set to 50°C in advance, extracted in the water bath for 30min, taken out and placed, cooled to room temperature; 3# and 4# were placed in a 50°C ultrasonic cleaner, 32kHz ultrasonic for 30min, taken out and cooled ; 5# and 6# were placed in a 50°C water bath constant temperature oscillator, shaken horizontally for 30min, and taken out. The extracted solution was transferred to a centrifuge tube, centrifuged at 4000 r / min for 5 min, and the supernatant was filtered into a 100 mL tube to constant volume for later use. Take 1 mL of the extraction solution for color development and measure the absorbance, respectively, and compare the tannin extraction rates of different extraction met...

Embodiment 3

[0044] Weigh 6 parts of about 1.67g of tangli powder into 6 identical conical flasks, add 100 mL of 50% ethanol solution to each, cover with a glass slide, and perform ultrasonic extraction at 50 °C and 32 kHz at the same time. After different times, the extracted solution was transferred to a centrifuge tube, centrifuged at 4000 r / min for 5 min, and the supernatant was filtered to a 100 mL tube to constant volume for later use. Take 1 mL of the extract for color development and measure the absorbance, and compare the extraction rates of tannins with different extraction times (30min, 40min, 60min, 80min, 100min, 120min), and obtain six groups of data of C1, C2, C3, C4, C5, and C6. absorbance, as image 3 shown.

[0045] pass image 3 It can be seen that before 100min, with the increase of extraction time, the extraction rate of tannins gradually increased, mainly because the extraction time was too short and the extraction of tannins was incomplete; with the increase of ext...

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Abstract

The invention discloses a method for extracting tannic acid from pears. A method for extracting tannins from pears, comprising the following steps: (1) selection of raw materials: cleaning, removing impurities, and peeling pears, cleaning them again, breaking them, and grinding them into powder to obtain pears powder; (2) Alcohol extraction: put the pear powder in an alcohol solution and let it stand at a constant temperature to obtain a mixed solution; (3) Centrifugation: the mixed solution is subjected to ultrasonic treatment at a constant temperature and then left to stand, and then subjected to extraction treatment, and the extracted solution is left to stand and centrifuged The obtained supernatant is the tannic acid solution. The method for extracting tannic acid from tang pear provided by the present invention has simple extraction means, and the instruments and reagents used are all conventional laboratory instruments, the overall operation reproducibility is good, and it is convenient for routine experiments.

Description

technical field [0001] The invention relates to the technical field of extraction of tannic acid, in particular to a method for extracting tannic acid from pears. Background technique [0002] Tangli is a perennial deciduous fruit tree. Tangli is widely distributed. It is common in southern, northern, northeastern and central my country. Tangli itself integrates food, use, wood and landscaping, and has high comprehensive utilization value. Its trunk can be used as a rootstock for artificial cultivation and grafting of pears, its fruit can be used as the main raw material for food processing, and its flowers can also be used for viewing. , and Tangli fruit itself has the functions of lowering blood sugar, eliminating accumulated food, unblocking two stools, astringing the lungs and astringent intestines, and can treat postpartum blood stasis and pain, and has high medicinal value. Tangli itself has high soluble tannin, also known as tannic acid, which has been used in medic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07H13/08C07H1/08
CPCC07H13/08C07H1/08
Inventor 徐阳纯王志强许泽群梁洁怡李维嘉
Owner INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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