Plant source bacteriostatic air purifying agent

Abstract

The invention relates to a plant source bacteriostatic air purifying agent, and belongs to the technical field of air purification. Aiming at the problems of toxicity residue, narrow antibacterial spectrum of single plant extract, low resource utilization rate and the like of a traditional chemical bactericide, the invention provides a multi-component synergistic natural antibacterial purifying agent. The composition comprises the following components in parts by weight: 10-25 parts of an orange peel extract, 8-20 parts of an artemisia argyi extract, 5-15 parts of a red-knees herb extract, 40-60 parts of a modified diatomite carrier loaded with nano-zinc oxide, 3-10 parts of a slow-release adhesive and 1-5 parts of a natural antioxidant. The preparation method comprises the following steps: preparing the plant extract (the orange peel is subjected to ethanol ultrasonic-microwave synergistic extraction, the mugwort is subjected to supercritical CO2 extraction, and the red-knees herb is purified by water), modifying a carrier (diatomite is loaded with nano-zinc oxide), and performing composite granulation and coating. Through synergistic bacteriostasis of active ingredients such as limonene, cineole and ellagic acid and photocatalysis of nano-zinc oxide, the 24-hour bacteriostasis rate on common pathogenic microorganisms such as escherichia coli and staphylococcus aureus reaches 85.3%-97.4%, the half-life period is prolonged to 60 days, the non-toxic grade is achieved, and the biodegradation rate is larger than or equal to 90%. The invention has the advantages of high efficiency, broad spectrum, safety, environmental protection and long-acting stability, and is suitable for indoor air microbial pollution prevention and control.

Description

Technical Field

[0001] The present invention relates to the technical field of air purification, and in particular to a natural antibacterial air purifier with orange peel extract, mugwort extract and polygonum hydropiper extract as composite active ingredients and a preparation method thereof, which is suitable for efficient prevention and control of indoor air microbial pollution. Background Art

[0002] As the pace of urbanization accelerates, people stay indoors more and more frequently. However, indoor air quality is often affected by multiple pollution sources, including but not limited to dust, microorganisms (such as bacteria and viruses), and allergens. These factors not only reduce living comfort, but also potentially harm human health, induce respiratory diseases and allergic reactions. Although traditional air purification methods, such as deploying air purifiers and enhancing ventilation, can improve indoor air quality to a certain extent, they are also accompanied by high energy consumption, noise interference, high maintenance costs, and may even bring the risk of secondary pollution.

[0003] 1. Existing technical problems: (1) Traditional chemical air disinfectants (such as sodium hypochlorite and peracetic acid) have problems such as toxic residues, strong corrosiveness, and easy to cause respiratory irritation; (2) Single plant-derived antibacterial agents (such as tea tree essential oil) have a narrow antibacterial spectrum, are easily volatile and ineffective, and are relatively expensive; (3) The resource utilization rate of plant waste such as orange peel, mugwort, and polygonum hydropiper is low, but their synergistic antibacterial potential has not been fully explored.

[0004] 2. Analysis of related patents: (1) CN202210024860.3 discloses “application of orange peel extract in air purification”, but does not involve multi-component synergistic enhancement; (2) CN201811116562.7 states that “Artemisia argyi extract has bactericidal effect”, but it has the defects of high volatility and short duration of effect; (3) CN202211096153.1 uses Polygonum hydropiper extract to prepare a bactericidal and anti-inflammatory composition, which requires the addition of a chemical surfactant.

[0005] In view of this, the present invention proposes a pure plant-based antibacterial air purifier with tangerine peel extract, artemisia extract and Polygonum hydropiper extract as main active ingredients, multi-component synergistic enhancement, long lasting effect, and no need to add chemical surfactants, aiming to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a novel antibacterial air purifier to solve the problems existing in the prior art.

[0007] 1. The plant-derived antibacterial air purifier of the present invention is characterized by comprising the following components in parts by weight: 10-25 parts of orange peel extract; 8-20 parts of Artemisia argyi extract; 5-15 parts of Polygonum hydropiper extract; 40-60 parts of modified diatomaceous earth carrier; Sustained-release binder (hydroxypropyl methylcellulose) 3-10 parts; Natural antioxidant (rosmarinic acid) 1-5 parts.

[0008] 2. The plant-derived antibacterial air purifier of the present invention is prepared by the following method: Step 1: Plant extract preparation Orange peel extract: Fresh orange peel was dried and crushed, then extracted with 70% ethanol by ultrasonic-microwave synergistic extraction (power 300 W, 50°C), and concentrated into an extract; Artemisia extract: The whole Artemisia argyi plant was extracted by supercritical CO2 extraction (pressure 25 MPa, temperature 45°C), and the volatile oil and non-polar components were collected; Polygonum hydropiper extract: The stems and leaves of Polygonum hydropiper are extracted with water and purified by macroporous resin to enrich phenolic acid active substances.

[0009] Step 2: Support modification After diatomite was activated by 5% citric acid and loaded with nano zinc oxide (ZnO NPs), the specific surface area increased to 220 m 2 / g.

[0010] Step 3: Compound preparation molding The three extracts were mixed with modified diatomaceous earth and a binder to form granules (particle size 1-3 mm) and coated with a rosmarinic acid antioxidant layer.

[0011] 3. The plant-derived antibacterial air purifier described in the present invention has the following synergistic antibacterial mechanism: Orange peel extract: limonene destroys microbial cell membranes, and flavonoids inhibit the energy metabolism of pathogens; Artemisia extract: eucalyptol and terpenes interfere with microbial nucleic acid synthesis; Polygonum hydropiper extract: Ellagic acid and gallic acid inhibit bacterial biofilm formation; Modified diatomaceous earth: Nano zinc oxide produces photocatalytic reactive oxygen species (ROS), enhancing the spectrum bactericidal effect.

[0012] The beneficial effects of the present invention are: 1. High efficiency in spectrum: 24-hour antibacterial rate against Escherichia coli (96.2%), Candida albicans (94.8%), Staphylococcus aureus (97.4%), and hemolytic Streptococcus (85.3%) (GB / T 18204.4-2013); 2. Long-term stability: The antioxidant coating extends the half-life of the active ingredient to 60 days (accelerated test at 40°C); 3. Safety and environmental protection: acute oral toxicity LD50>5000 mg / kg (non-toxic grade), biodegradation rate ≥90%. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 : Preparation process flow chart of the present invention. DETAILED DESCRIPTION

[0014] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0015] Example 1. A plant-derived antibacterial air purifier, the preparation process of which is as follows: 1. Prepare orange peel, mugwort and polygonum hydropiper extracts according to the proportions: Orange peel extract (containing limonene 12%, flavonoids 8%); Artemisia argyi essential oil (eucalyptol ≥ 25%); Polygonum hydropiper phenolic acid extract (ellagic acid ≥15%).

[0016] 2. Modified diatomaceous earth carrier loaded with nano zinc oxide (particle size 30-50 nm); 3. Mix 20 parts of orange peel extract, 15 parts of mugwort extract, 10 parts of Polygonum hydropiper extract, 50 parts of carrier, 8 parts of binder, and 3 parts of rosmarinic acid, granulate and coat with an antioxidant layer to obtain a plant-derived antibacterial air purifier.

[0017] Example 2. A plant-derived antibacterial air purifier, the preparation process of which is as follows: 1. Prepare orange peel, mugwort and polygonum hydropiper extracts according to the proportions: Orange peel extract (containing limonene 14%, flavonoids 9%); Artemisia argyi essential oil (eucalyptol ≥ 25%); Polygonum hydropiper phenolic acid extract (ellagic acid ≥15%).

[0018] 2. Modified diatomaceous earth carrier loaded with nano zinc oxide (particle size 30-50 nm); 3. Mix 25 parts of orange peel extract, 20 parts of mugwort extract, 15 parts of Polygonum hydropiper extract, 60 parts of carrier, 10 parts of binder, and 5 parts of rosmarinic acid, granulate and coat with an antioxidant layer to obtain a plant-derived antibacterial air purifier.

[0019] Example 3. A plant-derived antibacterial air purifier, the preparation process of which is as follows: 1. Prepare orange peel, mugwort and polygonum hydropiper extracts according to the proportions: Orange peel extract (containing limonene 12%, flavonoids 8%); Artemisia argyi essential oil (eucalyptol ≥ 25%); Polygonum hydropiper phenolic acid extract (ellagic acid ≥15%).

[0020] 2. Modified diatomaceous earth carrier loaded with nano zinc oxide (particle size 30-50 nm); 3. Mix 10 parts of orange peel extract, 8 parts of mugwort extract, 5 parts of Polygonum hydropiper extract, 40 parts of carrier, 3 parts of binder, and 1 part of rosmarinic acid, granulate and coat with an antioxidant layer to obtain a plant-derived antibacterial air purifier.

[0021] Comparative Example 1. Referring to Example 1, the orange peel extract was removed, and the remaining technical features were the same as those of Example 1, that is, a comparative example without orange peel extract was prepared.

[0022] Comparative Example 2. Referring to Example 1, the mugwort extract was removed, and the remaining technical features were the same as those of Example 1, that is, a comparative example without the mugwort extract was prepared.

[0023] Comparative Example 3. Referring to Example 1, the Polygonum hydropiper extract was removed, and the remaining technical features were the same as those of Example 1, that is, a comparative example without the Polygonum hydropiper extract was prepared.

[0024] Test. Referring to the standard GB / T 18204.4-2013 (Part 4 of the Public Place Hygiene Inspection Method: Microorganisms of Public Supplies and Utensils), the plant-derived antibacterial air purifiers prepared in Examples 1-3 and Comparative Examples 1-3 were tested for harmful microorganism removal effects (the 24-hour antibacterial rate in a closed space was calculated at a dosage of 15 g / m³). The test results are shown in Table 1:

[0025] As shown in Table 1, the removal effect of Examples 1-3 on the four kinds of harmful microorganisms is significantly better than that of Comparative Examples 1-3, which proves that the orange peel extract, Artemisia argyi extract, and Polygonum hydropiper extract in the technical solution play an indispensable role in the realization of the technical effect of the invention. The three are not based on the simple mixing and functional superposition of their respective prior art characteristics, but the synergistic enhancement between multiple components, which produces unexpected technical effects. It is a specific combination of the present invention to produce an effect superior to the prior art, which has obvious novelty, creativity, and practicality.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A plant-derived antibacterial air purifier, characterized in that: The invention comprises the following components in parts by weight: 10-25 parts of orange peel extract, 8-20 parts of mugwort extract, 5-15 parts of hot polygonum officinale extract, 40-60 parts of modified diatomaceous earth carrier, 3-10 parts of slow-release adhesive and 1-5 parts of natural antioxidant.

2. The purifying agent according to claim 1, characterized in that The orange peel extract is prepared by an ethanol ultrasonic-microwave synergistic extraction method, with an ethanol concentration of 60-80%, a microwave power of 200-400 W, and an extraction temperature of 40-60° C.

3. The purifying agent according to claim 1, characterized in that The mugwort extract is a mixture of volatile oil and non-polar components extracted by supercritical CO2, with an extraction pressure of 20-30 MPa and a temperature of 40-50°C.

4. The purifying agent according to claim 1, characterized in that The modified diatomite carrier is loaded with nano zinc oxide particles with a particle size of 20-80 nm and a specific surface area of ​​≥200 m 2 / g.

5. The method for preparing the purifying agent according to any one of claims 1 to 4, characterized in that: The method includes granulation and anti-oxidation coating process, and the particle size is 1-5 mm.

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