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A kind of stable pickering emulsion based on black tea nano-aggregate and its preparation method and application

An aggregate, dark tea technology, applied in the field of materials, can solve problems such as restricting applications, and achieve the effect of broadening the application field and improving the application value

Active Publication Date: 2021-05-11
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Pickering emulsion stabilizers are mainly inorganic particles, including: TiO 2 , SiO 2 , laponite (lithium magnesium silicate), montmorillonite (aluminosilicate), hydroxyapatite (basic calcium phosphate), etc., the biodegradability and biocompatibility of Pickering emulsion stabilized by inorganic particles will limit Its application in the field of food and pharmacy

Method used

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  • A kind of stable pickering emulsion based on black tea nano-aggregate and its preparation method and application
  • A kind of stable pickering emulsion based on black tea nano-aggregate and its preparation method and application
  • A kind of stable pickering emulsion based on black tea nano-aggregate and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Example 1: Construction of black tea nano aggregate pickering emulsion.

[0030](1) Accurately weigh 4.5g black tea tea in a 250ml conical bottle, add 25 ml of boiling water, 30 min, oscillated once every 10 minutes, heat filter, cool.

[0031](2) Take 4 ml of black tea extract in the 100 kDa ultrafiltration tube, centrifuge at a temperature of 4 ° C and 4000 g of centrifugation at 4000 g of centrifugation; the internal / outer tube solution is collected (an average diameter> 10 nm and an average diameter ≤10 nm The nano-aggregate solution, freeze-dried powder, that is, black tea nano aggregate, is for use.

[0032](3) Fixed black tea nano aggregate addition is 2% mass, ultrapure water dissolved, add 0.02% of mass fraction, 1 mol / L HCl or 1 mol / L NaOH to adjust black tea water extract The pH is 8, the tin foil paper is protected from light overnight (12 ~ 14h), the volume ratio of oil and water is 4: 6 to add soybean oil (total volume 50ml), 20000R / min shear homogeneous 2min, 40M...

Embodiment 2

[0033]Example 2: Determination of emulsion droplets and particle size distribution

[0034]The particle size and particle size distribution of the fresh or reserved emulsion prepared by the present invention utilizes the Marvin 3000 laser particle size gauge, and deionized water and 1% SDS are used as the dispersant. The relative refractive coefficient of the emulsion is set to 1.095, the ratio of the soybean oil refractive coefficient (1.456) and the water refractive coefficient (1.33). The particle size of the emulsion is represented by D4, 3 (volume weighted average particle diameter). The results show: black tea nano aggregate (average diameter>10nm) Pickering emulsion droplet diameter is 2.93 ± 0.01 μm, mainly in small particle distribution; black tea nano aggregate (an average diameter ≤10nm) Pickering emulsion droplet diameter is 7.00 ± 0.06 μm, mainly particle distribution . Black tea nano aggregate (average diameter>10 nm) emulsion droplets particle size distribution compared ...

Embodiment 3

[0035]Example 3: Determination of electrostatic stability of emulsion system

[0036]The emulsion Zeta potential was determined by LDV technology to study the static stability of the Pickering emulsion based on black tea nano aggregate stabilization. The results show: Black tea nano aggregate (average diameter>10nm) Pickering emulsion system Zeta potential value of 52.0 ± 1.7mV, black tea nano aggregate (an average diameter ≤10nm) Pickering emulsion system Zeta potential value 61.9 ± 0.7mV. Black tea nano aggregate (average diameter>10 nm and average diameter ≤10nm) The Pickering emulsion system Zeta potential value is greater than 50 mV, and the stability of the system is high.

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Abstract

The invention belongs to the technical field of materials, and discloses a stable Pickering emulsion based on dark tea nano-aggregates, a preparation method and application thereof. The method comprises the following steps: (1) extraction of black tea water extract, and ultrafiltration and centrifugation to separate dark tea nano-aggregates; (2) using dark tea nano-aggregates as an emulsion stabilizer to cause irreversible adsorption at the oil-water interface, A stable Pickering emulsion is obtained. The present invention uses nano-aggregates of different types of black tea as the Pickering emulsion stabilizer, which is natural in source, green and healthy, and can effectively stabilize the Pickering emulsion without modification. In addition, theabrownin, tea polyphenols, tea polysaccharides and other substances in black tea nano-aggregates have anti-oxidation, lipid-lowering and weight-loss effects, which can endow Pickering emulsion with the efficacy of bioactive components of dark tea nano-aggregates, and broaden the efficacy of Pickering emulsion. application fields and improve its application value.

Description

Technical field[0001]The present invention belongs to the field of material technology, and in particular, the present invention relates to a black tea nano aggregate stable Pickering emulsion and a preparation method thereof.Background technique[0002]The emulsion refers to two mutually immigration liquids, and a liquid is uniformly dispersed in another liquid obtained in a thermodynamically unstable dispersion system. The Pickering emulsion is a novel emulsion that is used simultaneously with a hydrophilic / intraoperative solid particles, compared to conventional emulsion, which has a good emulsion, less emulsifier, low cost, small toxicity, emulsion stability. Strong, it is not easy to be affected by ambient temperature, pH value, salt concentration, etc., generally has a wide range of applications in many fields such as cosmetics, food.[0003]Pickering emulsion stabilizer is mainly inorganic particles, including: TiO2SiO2, Lithium soapstone (lithium silicate), montmorillonite (si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01F3/08
Inventor 林晓蓉叶锡光李斌陈忠正张媛媛黄欣琪
Owner SOUTH CHINA AGRI UNIV