CN111109309A - Compound citronella essential oil mosquito repellent, preparation method and application thereof - Google Patents
Compound citronella essential oil mosquito repellent, preparation method and application thereof Download PDFInfo
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- CN111109309A CN111109309A CN201911396424.3A CN201911396424A CN111109309A CN 111109309 A CN111109309 A CN 111109309A CN 201911396424 A CN201911396424 A CN 201911396424A CN 111109309 A CN111109309 A CN 111109309A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
- A01N65/40—Liliopsida [monocotyledons]
- A01N65/44—Poaceae or Gramineae [Grass family], e.g. bamboo, lemon grass or citronella grass
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/73—Polysaccharides
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- A—HUMAN NECESSITIES
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- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/92—Oils, fats or waxes; Derivatives thereof, e.g. hydrogenation products thereof
- A61K8/922—Oils, fats or waxes; Derivatives thereof, e.g. hydrogenation products thereof of vegetable origin
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- A—HUMAN NECESSITIES
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- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
- A61Q17/02—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings containing insect repellants
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
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Abstract
The invention belongs to the technical field of mosquito repellents, and particularly relates to a compound citronella essential oil mosquito repellent, a preparation method and application thereof. Based on the advantages of natural safety, good mosquito repelling effect and the like of the plant volatile oil, the plant volatile oil is used as a main active substance for preparing the solid freshener. The solid refreshing agent is prepared from gellan gum 1.0%, RH-40 2.0%, citronella essential oil 15.0%, anhydrous alcohol 30%, and pigment by adding distilled water to 100.0%. The repellent rate is about 80.0 percent through a cylinder method test, and the mosquito repellent has good mosquito repellent activity.
Description
Technical Field
The invention belongs to the technical field of mosquito repellents, and particularly relates to a compound citronella essential oil mosquito repellent, a preparation method and application thereof.
Background
The mosquitoes can transmit various diseases such as malaria, dengue fever, Zika virus and the like, and the mosquitoes can interfere the normal life and physical and psychological health of people in the season. Along with the continuous improvement of the living standard of people, the consciousness of people on safety, environmental protection and health is continuously strengthened. Most of mosquito repellent products in the market are mainly chemical pesticides, and the mosquito repellent products have influence on the safety of human bodies and the environment and cause worry of consumers.
For a long time, the chemical synthetic insecticide has a main status due to good effect and long duration of mosquito repelling and killing, but the long-term use of the chemical synthetic insecticide can not only cause the mosquito to generate drug resistance, but also cause environmental pollution. Many plant essential oils have been found to have certain poisoning and repelling effects on mosquitoes, and the repelling mechanism is that the mosquitoes selectively avoid a signal source containing the plant essential oils or are repelled by the plant essential oils to reduce invasion to human beings, so that people are prevented from mosquito harassment, and the spread of insect-borne diseases is reduced. The plant essential oil has the development potential of ecological, social and economic benefits.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a compound citronella essential oil mosquito repellent, a preparation method and application thereof, and aims to solve part of problems in the prior art or at least alleviate part of problems in the prior art.
The invention is realized in such a way that the compound citronella essential oil mosquito repellent comprises the following components in percentage by weight: 1.0% of gellan gum, 2.0% of emulsifier, 15.0% of citronella essential oil, 30% of absolute ethyl alcohol and the balance of water.
Further, the emulsifier is hydrogenated castor oil RH-40.
Further, the paint also comprises pigment.
The preparation method of the compound citronella essential oil mosquito repellent is characterized by comprising the following steps: mixing an emulsifier with citronella oil and absolute ethyl alcohol to serve as a component 1 for later use; mixing water and gellan gum to obtain a component 2, heating, dissolving and stirring the component 2 uniformly, and stopping heating; and (3) slowly adding the component 1 into the component 2 when the temperature of the component 2 is reduced to about 75 ℃, uniformly stirring, pouring into a grinding tool, and naturally cooling to obtain the mosquito-proof solid freshener.
Further, during the slow addition of component 1 to component 2, a pigment is added.
The compound citronella essential oil mosquito repellent is applied to repelling mosquitoes.
In summary, the advantages and positive effects of the invention are:
based on the advantages of natural safety, good mosquito repelling effect and the like of the plant volatile oil, the plant volatile oil is used as a main active substance for preparing the solid freshener. The solid refreshing agent is prepared from gellan gum 1.0%, RH-40 2.0%, citronella essential oil 15.0%, anhydrous alcohol 30%, and pigment by adding distilled water to 100.0%. The repellent rate is about 80.0 percent through a cylinder method test, and the mosquito repellent has good mosquito repellent activity. The citronella oil has certain space repelling effect and can be directly used for skin or made into a mosquito repelling patch to be attached to clothes.
At present, the plant essential oil mosquito-repellent solid freshener in the market has few products, is a good substitute for chemical repellents, such as deet, anophelifuge ester and the like, is more acceptable to the public, and has wide development and application prospects.
Drawings
FIG. 1 is a tandem cylinder arrangement;
fig. 2 is a compound citronella essential oil anti-mosquito solid freshener.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the equipment and reagents used in the examples and test examples are commercially available without specific reference. The specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting.
The invention discloses a compound citronella essential oil mosquito repellent, a preparation method and application thereof, and gellan gum, citronella essential oil, litsea cubeba essential oil, bay essential oil, sweet basil essential oil and lavender essential oil which are related to the invention are purchased from a fragrance treatment enterprise store of a fragrance house FUN. Aedes albopictus purchased from Weibai Biotechnology Ltd, Guangzhou, was bred in a laboratory of this school [ T: (26 + -1) ° C, RH: (65 + -5.0)%, 12L: 12D ], and 3-5D after eclosion of healthy female mosquitoes without blood suction were selected in order.
Example 1 Single-factor experiment for mosquito-repellent solid freshener preparation
Firstly, mixing an emulsifier with citronella oil and ethanol to serve as a component 1 for later use; then distilled water and gellan gum are mixed to be used as a component 2; heating the component 2 to dissolve and stir evenly, and then stopping heating. And (3) when the temperature of the component 2 is reduced to about 75 ℃, slowly adding the component 1 into the component 2 while stirring, adding a proper amount of pigment, uniformly stirring, pouring into a grinding tool, and naturally cooling to obtain the mosquito-proof solid freshener.
In this example, gellan gum content, emulsifier, essential oil content, and absolute ethanol content were selected for single factor and orthogonal experiments, respectively.
1. Determination of gellan gum dosage
The gellan gum is formed by different contents (mass percentage of 0.4%, 0.6%, 0.8%, 1.0%, 1.2%) of the forming agent, and the prepared gel effect is different. The amount is preferably 0.8-1%, less than 0.8% is not desirable in the molded state, and more than 1% is good in hardness, but too viscous liquid is not favorable for stirring and increases the cost.
2. Selection of emulsifiers
Under the condition of 1.0% gellan gum content, an appropriate emulsifier for preparing the solid freshener is selected by comparing the appearance, the hardness, the forming state and the like, and the preparation formula is shown in table 1.
According to the formula, the emulsifier, the gellan gum and the water are heated, stirred and mixed, and the prepared gel is compared. The influence of 3 emulsifiers RH-40, T-80 and agar powder on the gel is that the gel state changes from a flowable state to a semi-solidified state and then to a viscous state along with the increase of the dosage. The agar powder prepared by different contents is fine, smooth and bright milky gel, but the water seepage is serious after standing. The RH-40 and T-80 are manufactured to be relatively bright, and the RH-40 has the best appearance, hardness and molding state effects.
Under the content of 10 percent by mass, the gel prepared from RH-40 has ideal forming state and transparency, the gel prepared from T-80 has a small amount of yellowing phenomenon, the gel state of the agar powder is unstable, and the surface is incomplete. Generally, RH-40 is more suitable for making gels than the 3 emulsifiers, judged from the clarity of appearance and the stability of dosage.
TABLE 1 preparation ratio of different emulsifiers
3. Determination of plant essential oil content
On the basis of the above-mentioned materials, the ideal dosage is selected, and is compounded with 10.0% RH-40, 30.0% absolute ethyl alcohol and 1.0% gellan gum, then respectively compounded with 5.0%, 10.0%, 15.0% and 20.0% of essential oil, and then the above-mentioned materials are supplemented with distilled water to 100.0%. Through comparison after preparation, under the condition that the using amount of the emulsifier is the same, the transparency of the gel is reduced along with the increase of the oil content, the appearance and the surface flatness are all deteriorated, the smell is too light when the using amount is less than 10.0 percent, the appearance forming state is influenced when the using amount is more than 15.0 percent, and the essential oil content is optimal when the using amount is 10.0 to 15.0 percent through comparison.
Example 2 multifactor experiment for anti-mosquito solid freshener preparation
1. Preferred prescription for orthogonal test
Selecting the type (A) of the compound plant essential oil, RH-40(B) and the content (C) of the essential oil as three factors according to the research work before the prescription and the combination of the pre-test result, respectively selecting 5 levels, and optimizing the prescription of the compound citronella essential oil mosquito-repellent solid freshener by orthogonal design, wherein the orthogonal design is shown in a table 2.
TABLE 2 optimized orthogonal test factor level for prescription of compound citronella essential oil mosquito-repellent solid freshener
2. The mosquito repelling experiment by the series cylinder method comprises the following specific steps: connecting 3 transparent cylinders with diameter of 21cm, length of 43cm, diameter of 21cm and length of 17cm in series, separating 3 long cylinders with baffle plates, blocking two ends with sand net, and adding a closed cylinder (figure 1) blocked by baffle plate at one end for placing mosquito. Wherein 30 female mosquitoes are put into the No. 2 cylinder, after the mosquitoes are stabilized, 3 baffles are simultaneously pulled out, and the mosquitoes are pulled to a small hole with the central diameter of 5 cm. Then, the medicine to be tested is put into the No. 1 cylinder for timing, and the number of mosquitoes in each cylinder is recorded for 30 min, 60 min, 90 min and 120min respectively. The ones without drug were used as blank control, and the effect on mosquito repelling in the cylinder before and after drug placement was calculated. And repeating and cleaning the device.
The calculation formula of the repellent rate is that PR is (Nc-Nt)/(30-Nd) multiplied by 100 percent
Nc represents the sum of the number of mosquitoes in the No. 3-5 cylinder after the pesticide is put; nt represents the sum of the number of mosquitoes in the No. 3-5 cylinder before the drug is released; nd represents the number of mosquitoes in the No. 2 cylinder after the pesticide is put.
And (3) taking the repellent effect of the solid freshener as an investigation index, and performing orthogonal experiments to determine the optimal formula of the compound citronella essential oil mosquito-repellent solid freshener. As can be seen from an intuitive analysis table, the factor A is the main factor influencing the repellent effect of the solid freshener, the factor B is the next factor, the minimum influence is the factor C, and the optimal formula is determined by the comprehensive average value (see table 3). The results of the analysis of variance on the factors are shown in table 4, and the analysis of variance table shows that the factor A has obvious influence and the factors B and C have no obvious influence on the repellent effect of the solid freshener.
The test result shows that the spatial repelling rate of the aedes albopictus reaches about 80.0 percent, and the mosquito repelling effect is good.
TABLE 3 visual analysis meter (series cylinder method)
TABLE 4 analysis of variance 1
3. Attack force test
300 test insects are put into the mosquito cage, the skin area of the back of the hand of the tester is exposed by 40mm multiplied by 40mm, and the rest parts are closely shielded. The arms are put into the mosquito cage for 2min, the mosquitoes are observed to stop falling, the arms are shaken to drive the mosquitoes away before the mouth organ of the mosquitoes penetrates the skin, and the condition is recorded as that 1 test insect stops falling. More than 30 test persons who stop before and test insects are qualified in attack power, and the mosquitoes of the person and the cage can be subjected to a repelling test. Whether the attack force of the mosquitoes is qualified or not is inspected by the method, the experiment is continued if the attack force of the mosquitoes is qualified, and the experiments are carried out if the attack force of the mosquitoes is unqualified.
4. Mosquito bite
Mosquito cage biting method 1: a similar method for detecting the pesticide effect of the repellent GB/T13917.9-2009 in national standards is adopted. Exposing the back of the hand to an area of 4cm multiplied by 4cm, tightly wrapping the rest parts, sticking the mosquito repelling paste at a position 0.1-0.5 cm away from the edge of the exposed skin, locating at the wrist end, extending the hand into a mosquito cage filled with 50-100 aedes albopictus, and observing the number of mosquitoes stopping on the exposed skin within 2min to suck blood. The other hand is treated in the same way, but the other hand is not coated with the citronella essential oil mosquito-repellent solid freshener, a blank test is carried out, and the result is expressed by the repellent rate.
Mosquito cage biting method 2: similar method for detecting repellent efficacy GB/T13917.9-2009 in national standard[2]. The whole hand is exposed, the wrist and the parts above are tightly wrapped, the mosquito repelling paste is attached to the back of the hand close to the end of the wrist and extends into a mosquito cage filled with about 100 aedes albopictus, and the number of mosquitoes stopping on the exposed skin within 2min to suck blood is observed. The other hand is treated in the same way, but the other hand is not coated with the citronella essential oil mosquito-repellent solid freshener, a blank test is carried out, and the result is expressed by the repellent rate.
TABLE 5 repellent Effect of solid mosquito repellent on Aedes albopictus
5. Volatility testing method
The prepared anti-mosquito solid freshener is placed in an environment with the room temperature of 25-27 ℃ to be volatilized freely, and weighing and weight measurement are carried out every 24 hours, namely the volatilization every day is calculated (the volatilization amount is the former weight measurement-the current weight measurement).
Taking a home-made compound citronella essential oil mosquito-repellent solid freshener as A and a commercially available solid freshener as B, carrying out volatility test for one week at room temperature, recording the weight (volatilization amount) reduced by the solid freshener every day, and comparing the results (Table 6).
TABLE 6 volatilization of A and B
The final prescription screened by orthogonal experiment, 1.0% gellan gum, 2.0% RH-40, 15.0% citronella essential oil, 30% absolute ethyl alcohol, and a little pigment, and the obtained freshener is supplemented to 100.0% with distilled water, and is shown in figure 2. The repellent rate measured by the mosquito cage biting methods 1 and 2 is over 80 percent, and the mosquito repellent has good mosquito repellent effect. Through the volatility experiment compared with the solid freshener purchased in the market, the home-made compound citronella essential oil mosquito-repellent solid freshener volatilizes slowly and has lasting fragrance, and the mosquito-repellent time effectiveness is increased.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. The compound citronella essential oil mosquito repellent is characterized by comprising the following components in percentage by weight: 1.0% of gellan gum, 2.0% of emulsifier, 15.0% of citronella essential oil, 30% of absolute ethyl alcohol and the balance of water.
2. The compound citronella essential oil mosquito repellent according to claim 1, which is characterized in that: the emulsifier is hydrogenated castor oil RH-40.
3. The compound citronella essential oil mosquito repellent according to claim 1, which is characterized in that: also comprises pigment.
4. The preparation method of the compound citronella essential oil mosquito repellent as claimed in any one of claims 1 to 3, which is characterized by comprising the following steps: mixing an emulsifier with citronella oil and absolute ethyl alcohol to serve as a component 1 for later use; mixing water and gellan gum to obtain a component 2, heating, dissolving and stirring the component 2 uniformly, and stopping heating; and (3) slowly adding the component 1 into the component 2 when the temperature of the component 2 is reduced to about 75 ℃, uniformly stirring, pouring into a grinding tool, and naturally cooling to obtain the mosquito-proof solid freshener.
5. The preparation method of the compound citronella essential oil mosquito repellent according to claim 4, which is characterized in that: placing the component 2 in a constant temperature water bath kettle, keeping the temperature to 75 ℃, slowly adding the component 1 into the component 2, and finally adding the pigment.
6. The use of a compound citronella essential oil mosquito repellent as in any one of claims 1-3 in repelling mosquitoes.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112219844A (en) * | 2020-10-20 | 2021-01-15 | 咸阳职业技术学院 | Botanical mosquito repellent and preparation method thereof |
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| CN112219844B (en) * | 2020-10-20 | 2022-04-01 | 咸阳职业技术学院 | Botanical mosquito repellent and preparation method thereof |
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