Stable Pickering emulsion based on black tea nano-aggregates and preparation method and application of stable Pickering emulsion

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: 2019-05-28
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Pickering emulsion stabilizers are mainly inorganic particles, including: TiO 2 , SiO 2 , laponite (lithium magnesium silicate), montmorillonite (aluminosilicate), hydroxyapatite (b

Method used

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  • Stable Pickering emulsion based on black tea nano-aggregates and preparation method and application of stable Pickering emulsion
  • Stable Pickering emulsion based on black tea nano-aggregates and preparation method and application of stable Pickering emulsion
  • Stable Pickering emulsion based on black tea nano-aggregates and preparation method and application of stable Pickering emulsion

Examples

Experimental program
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Effect test

Embodiment 1

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

[0030] (1) Accurately weigh 4.5g of black tea leaves into a 250mL Erlenmeyer flask, add 225mL of boiling water, bathe in boiling water for 30min, shake once every 10min, suction filter while hot, cool to constant volume.

[0031] (2) Pipette 4mL black tea water extract into the inner tube of a 100KDa ultrafiltration tube, centrifuge at a temperature of 4°C and a centrifugal force of 4000g for 20min; collect the inner / outer tube solution to obtain different particle size ranges (average diameter > 10nm and average diameter ≤ 10nm ) nano-aggregate solution, freeze-dried to obtain freeze-dried powder, which is dark tea nano-aggregate, ready for use.

[0032] (3) The amount of black tea nano-aggregate added is 2% by mass, dissolved in ultrapure water, and sodium azide with a mass fraction of 0.02% is added, and the disperse phase of the black tea water extract is adjusted respectively with 1mol / L HCl ...

Embodiment 2

[0033] Embodiment 2: emulsion droplet size and particle size distribution measurement

[0034]The particle size and particle size distribution of the fresh or stored emulsion prepared by the present invention are measured by a Malvern 3000 laser particle size analyzer, and deionized water and 1% SDS are used as dispersants respectively. The relative refractive index of the emulsion is set at 1.095, which is the ratio of the refractive index of soybean oil (1.456) to the refractive index of water (1.33). The particle size of the emulsion is expressed as d4,3 (volume-weighted average particle size). The results showed that: black tea nano-aggregates (average diameter>10nm) Pickering emulsion droplet size was 2.93±0.01μm, mainly small particle distribution; dark tea nano-aggregates (average diameter≤10nm) Pickering emulsion droplet size It is 7.00±0.06μm, mainly distributed by large particles. The droplet size distribution of dark tea nano-aggregates (average diameter>10nm) is ...

Embodiment 3

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

[0036] LDV technology was used to measure the Zeta potential of the emulsion, and the electrostatic stability of the Pickering emulsion stabilized based on black tea nano-aggregates of the present invention was studied. The results showed that the Zeta potential value of black tea nano-aggregate (average diameter>10nm) Pickering emulsion system was 52.0±1.7mV, and the Zeta potential value of black tea nano-aggregate (average diameter≤10nm) Pickering emulsion system was 61.9±0.7mV. Black tea nano-aggregate (average diameter>10nm and average diameter≤10nm) Pickering emulsion system Zeta potential value is greater than 50mV, and the system has high electrostatic stability.

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Abstract

The invention belongs to the technical field of materials, and discloses a stable Pickering emulsion based on black tea nano-aggregates and a preparation method and application of the stable Pickeringemulsion. The preparation method comprises the following steps that (1) a black tea water extract is extracted, and the black tea nano-aggregates are separated by ultrafiltration centrifugation; and(2) the black tea nano-aggregates are used as an emulsion stabilizer to cause irreversible adsorption at an oil-water interface to obtain the stable Pickering emulsion. According to the stable Pickering emulsion based on the black tea nano-aggregates and the preparation method and application of the stable Pickering emulsion, the nano-aggregates of different types of black tea are used as the Pickering emulsion stabilizer, the sources are natural, the nano-aggregates are green and healthy, and the Pickering emulsion can be effectively stabilized without modification; and in addition, substances such as theabrownins, tea polyphenols and tea polysaccharides in the black tea nano-aggregates have anti-oxidation, lipid-lowering and weight-reducing effects, the efficacy of bioactive components of the black tea nano-aggregates can be imparted to the Pickering emulsion, the application fields of the Pickering emulsion are broadened, and the application value of the Pickering emulsion is increased.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a stable Pickering emulsion based on black tea nano-aggregates, a preparation method and application thereof. Background technique [0002] Emulsion refers to two immiscible liquids, a thermodynamically unstable dispersion system obtained by uniformly dispersing one liquid in another liquid. Pickering emulsion is a new type of emulsion that uses hydrophilic / lipophilic solid particles instead of traditional surfactants. Compared with traditional emulsions, it has better emulsification effect, less emulsifier dosage, low cost, less toxicity, and better emulsion stability. Strong, not easily affected by ambient temperature, pH value, salt concentration, etc., generally has long-term stability, and is widely used in many fields such as cosmetics and food. [0003] Pickering emulsion stabilizers are mainly inorganic particles, including: TiO 2 , SiO 2 , laponite (lithium magnesiu...

Claims

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Application Information

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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
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