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A method for preparing nano-gold particles using wolfberry extract
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A technology of nano-gold particles and leaching solution, applied in nano-technology, metal processing equipment, transportation and packaging, etc., can solve the problems such as nano-gold particles that have not yet been seen, and achieve the effect of avoiding residues
Active Publication Date: 2017-11-14
UNIV OF SHANGHAI FOR SCI & TECH
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So far, it has been found that there are few types of plants that can be used, including grapefruit, geranium and vine tea, etc., and wolfberry has not been used to synthesize gold nanoparticles.
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Embodiment 1
[0030] In this embodiment, the preparation reaction process of gold nanoparticles is as follows:
[0031] First, put 25mL of wolfberry extract into a flask, heat to boiling, and keep boiling for 5 minutes;
[0032] Then, get 100 μ L of chloroauric acid solution and add to the flask, measure the pH of the reaction system after the chloroauric acid solution is added, keep the reaction system boiling, and take a sample after reacting for a certain period of time;
[0033] Finally, part of the samples obtained from the above sampling were centrifuged at 8000 rpm for 10 minutes, and the precipitate obtained by centrifugation was dried at 40° C. to 50° C. to obtain gold nanoparticles corresponding to different reaction times.
[0034] Wherein, after adding the chloroauric acid solution, the pH of the reaction system is 5.16; the time points of sampling are respectively 2 minutes, 5 minutes, 10 minutes, 15 minutes, and 20 minutes, and the samples obtained by sampling are divided into...
Embodiment 2
[0042] In this embodiment, for the same method, condition and equipment as in Embodiment 1, the same description is omitted.
[0043] In this embodiment, the preparation reaction process of gold nanoparticles is as follows:
[0044] First, take 25ml wolfberry extract and put it into a flask, heat it to boiling, and keep boiling for 10 minutes;
[0045] Then, get 200 μ L of chloroauric acid solution and add to the flask, measure the pH of the reaction system after the chloroauric acid solution is added, keep the reaction system boiling, and take a sample after reacting for a certain period of time;
[0046] Finally, centrifuge and dry part of the samples obtained from the above sampling to obtain gold nanoparticles corresponding to different reaction times.
[0047] Wherein, after adding the chloroauric acid solution, the pH of the reaction system is 4.96.
[0048] Figure 4 It is the ultraviolet-visible absorption spectrum (UV-Vis) figure of the reaction solution obtained aft...
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Abstract
The invention provides a method for preparing nano-gold particles using wolfberry extract, comprising the following steps: step 1, washing wolfberry and extracting it with deionized water to obtain wolfberry extract; step 2, extracting the wolfberry obtained in step 1 Lycium barbarum extract is heated to boiling and kept boiling for a certain period of time, the chloroauric acid solution is added to the wolfberry extract to form a reaction system, and the pH of the reaction system is adjusted by adjusting the amount of chloroauric acid solution, so that the reaction system The pH is between 4.0 and 5.5, keep the reaction system in a boiling state, react for 2 minutes to 60 minutes, and obtain a reaction solution; step 3, centrifuge the reaction solution obtained in step 2 to obtain a precipitate, and dry the precipitate After that, gold nanoparticles are obtained. The method provided by the invention can be used to prepare nano-gold particles, the particle size of which is below 50nm, and does not contain chemical reagent residues, and is suitable for application in the field of biomedicine.
Description
technical field [0001] The invention relates to a method for preparing nanomaterials, in particular to a method for preparing nano-gold particles by using wolfberry extract. Background technique [0002] Nanoparticle materials refer to materials with a particle size below 100nm. Among them, nanoparticle materials composed of metal element gold, that is, nano-gold particle materials have unique optical, electrical and catalytic properties, and have broad application prospects in many fields. . [0003] In recent years, researchers have discovered that gold nanoparticle markers can be prepared after surface modification of gold nanoparticles, and the gold nanoparticle markers still have similar spectral properties to gold nanoparticles. Using this characteristic of gold nanoparticles, Nano-gold particles can be prepared as biological probes to detect the labeled substances. Therefore, gold nanoparticles have good application prospects in the field of biomedicine. [0004] A...
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