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Titanium dioxide nano particle and litchi nano preservative

A nanoparticle and titanium dioxide technology, applied in the direction of protecting fruits/vegetables with a coating protective layer, can solve problems such as adverse reactions and affecting human health

Active Publication Date: 2011-06-01
嘉兴卓十生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned preservatives all use organic components, which adhere to the surface of lychees for a long time, and easily enter the pulp through penetration to produce adverse reactions and affect human health.

Method used

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  • Titanium dioxide nano particle and litchi nano preservative
  • Titanium dioxide nano particle and litchi nano preservative
  • Titanium dioxide nano particle and litchi nano preservative

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 10gTiCl 4 Add in 500ml of water, adjust the pH value to 6.2 with concentrated ammonia water, obtain 50g of white precipitate after centrifugation (4000r / min), then add 500ml of deionized water after the precipitated substance is washed 2 times with deionized water, then add 10ml of nitric acid (diluted until the volume ratio concentration is 30-50%), a transparent liquid is obtained after fully stirring for 1 hour; after standing for 6 hours, 0.5g AgNO 3 Add it into a transparent liquid, and heat it at 95°C for 4 hours to obtain a milky white nano-titanium dioxide sol. The size of the obtained titanium dioxide nanoparticles is 6-10 nm, and the grain size is anatase phase. See the SEM image of the nanoparticles. figure 1 shown.

[0031] Add 1g of sodium hexametaphosphate to the milky white nano-titanium dioxide sol after cooling and stir to obtain a well-dispersed solution A;

[0032] Add 1g of lychee leaves to 10ml of water, boil for 0.5h to obtain an aqueous solution...

Embodiment 2

[0036] 10gTiOSO 4 Add in 500ml of water, adjust the pH to 6.8 with concentrated ammonia water, obtain (4500r / min) after centrifugation and obtain 56g of white precipitate, add 500ml of deionized water after washing the white precipitate with deionized water 3 times, and then use 10ml of 30% (volume Specific concentration) concentration of hydrogen peroxide was fully stirred for 1h to obtain a transparent liquid, and then left to stand for 6h, 1g Ce(NO 3 ) 3 Add it, and then heat-preserve at 95°C for 6 hours to obtain a milky white nano-titanium dioxide sol. After cooling, add 1.5g of sodium hexametaphosphate and stir evenly to obtain a well-dispersed nano-titanium dioxide solution;

[0037] The size of the nanoparticles is detected by a transmission electron microscope, and the crystal phase is measured by an X-ray crystal diffractometer. The average size of the titanium dioxide nanoparticles is 6-10 nm, and the crystal phase is an anatase phase.

[0038] Add 1g of lychee le...

Embodiment 3

[0042] 10gTi(SO 4 ) 2 Add 500ml of water, adjust the pH to 6.0 with concentrated ammonia water, and obtain a white precipitate after centrifugation, then wash the precipitate with deionized water twice, add 500ml of deionized water, and then use 10ml of 30% hydrogen peroxide to fully stir for 1 hour to obtain transparent liquid, then 0.8g Gd(NO 3 ) 3 After adding it, heat preservation treatment at 95°C for 6 hours to obtain a milky white nano-titanium dioxide sol; after cooling, add 1.2 g of sodium tripolyphosphate and stir evenly to obtain a well-dispersed nano-titanium dioxide solution;

[0043] The size of the nanoparticles is detected by a transmission electron microscope, and the crystal phase is measured by an X-ray crystal diffractometer. The average size of the titanium dioxide nanoparticles is 6-10 nm, and the crystal phase is an anatase phase.

[0044] Add 1g of lychee leaves to 12ml of water, boil the aqueous solution obtained after 30min, and concentrate to abou...

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Abstract

The invention discloses a titanium dioxide nano particle and a litchi nano preservative. The titanium dioxide nano particle is obtained by processing a sediment obtained by hydrolyzing inorganic titanium salt under an alkaline condition by using oxidizer, and then adding noble metal ions for heat insulation treatment; the dimension of the titanium dioxide nano particle is 6-10 nanometers; and crystallite phase is in anatase phase. The litchi nano preservative is obtained by adding fresh litchi juice to a titanium dioxide nano particle solution and uniformly stirring. The litchi nano preservative obtained by blending the doped titanium dioxide nano particle with the fresh litchi juice is a green environmental-friendly preparation without any toxic side effect; litchi fruits do not have any peculiar smell and discoloration after 30-60 days and keep original fresh taste; the cost of the litchi nano preservative preserving each kilogram of litchis is about 0.05 yuan; and in addition, the litchi nano preservative has the advantages of long preservative time and low cost and can better keep the litchis taste delicious.

Description

technical field [0001] The invention belongs to the technical field of fruit preservation, and in particular relates to a titanium dioxide nanoparticle and its application in litchi preservation. Background technique [0002] The ripening period of litchi coincides with the high temperature season in midsummer, and the fruit is extremely intolerant to storage. The annual loss of litchi due to rot and deterioration accounts for more than 20% of the total output. Therefore must carry out storage and fresh-keeping after lychee is gathered. At present, in terms of quick-frozen and refrigerated preservation of lychee, it can basically guarantee the fruit to be stored for half a year or longer. However, no major breakthrough has been made in terms of fresh-keeping at room temperature. At present, domestic and foreign studies on storage at room temperature mainly focus on the screening and application of preservatives and preservatives, but the holding time generally does not ex...

Claims

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Application Information

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IPC IPC(8): A23B7/16
Inventor 周武艺
Owner 嘉兴卓十生物科技有限公司
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