52 results about "Cymenes" patented technology

The present invention belongs to the technical field of resource recovery and utilization, and discloses a method for selectively preparing monocyclic aromatic hydrocarbons by catalytic pyrolysis of waste tires. The steps are as follows: First, the USY molecular sieve is mixed with a Cu(NO3)2·3H2O solution by an impregnation method to prepare a Cu-USY molecular sieve; then the waste tires and the Cu-USY molecular sieve catalyst are loaded into a quartz tube reactor in layers for rapid catalytic pyrolysis to prepare waste tire pyrolysis oil. The present invention solves the problem that the selectivity of the USY catalyst for monocyclic aromatic hydrocarbons is not high during the pyrolysis of waste tires, resulting in a low yield of monocyclic aromatic hydrocarbons, especially the yield of p-cymene. At the same time, the USY molecular sieve is loaded with a cheap transition metal Cu, which saves costs and has high economic value. The pyrolysis oil rich in aromatic hydrocarbons prepared by this method has broad application prospects for the preparation of fuels or deep processing of chemicals.

A pest control composition includes from about 4 wt % to about 10 wt % of sodium lauryl sulfate; one or more C5 to C9 hydrotropic salt; from about 1 wt % to about 10 wt % of one or more active ingredients selected from the group consisting of corn mint oil, peppermint oil, spearmint oil, rosemary oil, thyme oil, citronella oil, clove oil, cedarwood oil, cinnamon oil, geranium oil, eugenol, 2-phenylethyl propionate, menthol, menthone, thymol, carvone, camphor, methyl salicylate, p-cymene, linalool, geraniol, cinnamyl acetate, cinnamic alcohol, cinnamaldehyde, citronellol, eucalyptol / 1,8-cineole, alpha-pinene, bornyl acetate, gamma-terpinene, and combinations thereof; and from about 60 wt % to about 95 wt % of water. The pest control composition exhibits a water peak in a 2H spectrum having a width encompassing 90% of the area of the entire water signal of about 50 Hz or more, as determined by the 2H NMR Method.

The invention relates to the use of herbal preparation, characterized by presence of 4 dominant compounds (carvacrol a from about 35% to about 50%, γ-terpinene from about 10% to about 30%, thymol from about 10% to about 25%, p-cymene from about 8% to about 20%, as expressed in % of total peak area in GC / MS chromatogram), obtained by mixing at least two essential oils from species selected from the group of genera Satureja L., Origanum L. and Thymus L., to prepare food supplement or medicament for treatment and prevention of gastric Helicobacter pylori infection in humans. The mixture may be placed on liquid or solid carrier and capsulated in non gastro-resistant capsules. The invention also relates to dosage regiment of herbal preparation for treatment and prevention of patients with Helicobacter pylori infection which leads to successful eradication of bacteria without any side-effects.

The invention relates to the technical field of traditional Chinese medicine detection, in particular to a method for determining the content of various components in blumea balsamifera oil. According to the method, a gas chromatography-mass spectrometry (GC-MS) technology is adopted, and chromatographic conditions are as follows: a chromatographic column is an SH-Stabilwax (30m * 0.32 mm, and the film thickness is 0.25 [mu] m) capillary column; the temperature of a sample inlet is 230 DEG C; the split ratio is 10: 1; the sample size is 1 microliter; the mass spectrum conditions are as follows: the ion source temperature is 200 DEG C; the interface temperature is 230 DEG C; the ionization mode is electron impact ion (EI); the detection voltage is 0.2 KV; the solvent is delayed for 2 minutes; the mass number scanning range is 30 to 400 amu; and SIM mode. According to the method disclosed by the invention, the contents of alpha-pinene, camphene, beta-pinene, limonene, p-cymene, camphor, alpha-coumarin, linalool, bornyl acetate, beta-caryophyllene, myrtenal, alpha-caryophyllene, L-borneol, perillaldehyde, caryophyllene oxide, guaiacol, beta-eudesmol and xanthoxylin in the blumea balsamifera oil can be simultaneously determined; the method provided by the invention has good precision, repeatability and stability, and the quality consistency of the blumea balsamifera oil can be quickly, accurately and effectively evaluated through detection of multiple components.

This invention relates to the field of grain storage technology, and in particular to a natural plant essential oil insecticide composition, its preparation method, and its application. The natural plant essential oil insecticide composition comprises a main active ingredient and co-active ingredients. The main active ingredient includes cinnamaldehyde, allyl isothiocyanate, and cuminaldehyde. The co-active ingredients include 1,8-cineole, β-phellandrene, γ-terpinene, p-cymene, eugenol, α-pinene, linalool, and limonene. By volume percentage, the insecticide composition contains: cinnamaldehyde 15-40%, allyl isothiocyanate 20-40%, and cuminaldehyde 0.5-16.5%. The insecticide composition provided by this invention is made from natural plant essential oils, is stable, safe, environmentally friendly, does not pollute grains, and has an aromatic odor. It has a strong insecticidal effect on pests such as rice weevils in grains and has good application prospects in the field of grain storage.

The invention discloses a compound essential oil for relieving primary dysmenorrhea and a preparation method thereof. The compound essential oil for relieving primary dysmenorrhea includes limonene, gingerol, α-terpinene acetate, β-sesquiphellandrene, eucalyptol, p-cymene, β-phellandrene, γ-terpinene, α-pinene, β-bisabolene, α-curcumene, trans-caryophyllene, camphene, β-pinene, myrcene, linalool, cis-11-eicosenoic acid, 3-thujacene, α-farnesene, sabinene, 3-carene, nonanoic acid, α-copaene, β-elemene. The present invention has a significant effect of relieving primary dysmenorrhea, and has good safety. In addition, essential oil preparations are easier to penetrate into the skin than cream preparations, and are more likely to activate cells after being absorbed by the skin.

The invention provides a pharmaceutical composition and application thereof, and the pharmaceutical composition comprises alpha-pinene, p-cymene, beta-myrcene and beta-phellandrene. The pharmaceutical composition has good inhibitory activity on rhinoviruses and can be used for relieving cough symptoms.

A pest control composition having from about 4 wt % to about 10 wt % of sodium lauryl sulfate, one or more C5 to C9 hydrotropic salt, from about 1 wt % to about 10 wt % of an active ingredient selected from the group consisting of corn mint oil, peppermint oil, spearmint oil, rosemary oil, thyme oil, citronella oil, clove oil, cedarwood oil, cinnamon oil, geranium oil, eugenol, 2-phenylethyl propionate, menthol, menthone, thymol, carvone, camphor, methyl salicylate, p-cymene, linalool, geraniol, cinnamyl acetate, cinnamic alcohol, cinnamaldehyde, citronellol, eucalyptol / 1,8-cineole, alpha-pinene, bornyl acetate, gamma-terpinene, and combinations thereof, and from about 60 wt % to about 95 wt % water. The pest control composition can exhibit a tan delta-1 value at a frequency of 1 Hz of from about 0.1 to about 2.

Disclosed is a compound essential oil for improving dull skin, which comprises the following components: oleic acid, linoleic acid, palmitic acid, stearic acid, limonene, α-pinene, linalool, palmitoleic acid, eicosanoic acid, squalene, α-copaene, cis-11-eicosenoic acid, β-pinene, trans-caryophyllene, 3-thujene, camphene, behenic acid, myristic acid, p-cymene, (+)-δ-cadinene, menthol, linolenic acid, caprylic acid, menthone, capric acid, sabinene, and myrcene. The compound essential oil has excellent effects of skin whitening, brightening, and moistening.

The invention discloses laurel essential oil with anti-aging activity and application of the laurel essential oil. According to the method, laurel essential oil is used for acting on caenorhabditis elegans to verify the aging delaying effect of the caenorhabditis elegans, after the caenorhabditis elegans are counted and subjected to synchronization treatment, a life determination test of the caenorhabditis elegans is carried out, a blank control group, a DMSO solvent group, a positive drug group and a laurel essential oil experimental group are set respectively, a survival curve is drawn, and statistical analysis is carried out. Results show that the lifetime of nematodes in a laurel essential oil treatment group is remarkably prolonged, and the anti-aging effect of the laurel essential oil treatment group is superior to that of a Meanwhile, target function analysis on the laurel essential oil shows that the essential oil regulates and controls senescence-related pathways. The further determination of the effect of monomer components in the laurel essential oil on delaying caenorhabditis elegans aging shows that p-cymene, methyleugenol, ocimene, linalool, sabinene, 4-terpene alcohol, terpinene and linalyl acetate show significant anti-aging activity.

This invention discloses an efficient method for preparing p-cymene ruthenium iodide dimer. The method uses ruthenium trichloride as the ruthenium source, propylterpinene as the ligand precursor, and an alcohol solvent as the reaction medium. The target product is synthesized efficiently through a two-step continuous reaction. First, ruthenium trichloride and propylterpinene are reacted at a specific temperature to generate a dichloro(p-cymene)ruthenium dimer intermediate. Then, an iodide aqueous solution is added for reflux reaction to complete the replacement of chloride ions with iodide ions. Finally, high-purity p-cymene ruthenium iodide dimer is obtained after simple post-processing. This invention innovatively uses propylterpinene instead of traditional phellandrene, significantly improving the stability and purity of the raw materials and reducing production costs. The one-step integrated process simplifies the operation process, avoids the risk of organic vapor exposure, and improves production safety. Optimized reaction parameters and material ratios achieve a product yield of up to 99.8%, and the process is adaptable to large-scale production requirements.

The invention belongs to the technical field of precursor purification, and particularly relates to purification equipment and a purification method of alpha-terpinene. The purification equipment provided by the invention is simple in structure and convenient to disassemble, fill, operate and overhaul, the adsorption material can be regenerated and reused, and the operation is efficient. According to the purification equipment in the scheme, through an adsorption and rectification combined method, firstly, impurities such as eucalyptol and cymene are efficiently removed by adopting an adsorption material, and then high-boiling-point impurities, low-boiling-point impurities and ion impurities are further removed through two-stage vacuum rectification, so that a high-purity alpha-terpinene product is obtained, the product purity is 99.5% or above, and the purity of the alpha-terpinene product is higher than 99.5%. The total amount of impurities is not higher than 5ppb, the product is high in purity, high in yield and high in purification efficiency, the raw materials are easy to obtain, the cost is low, the quality is stable, and the product quality meets the downstream use requirement.

A kind of waste tire supercritical carbon dioxide pyrolysis production rich in p-cymene pyrolysis oil and high-value method and system.The present application is with supercritical carbon dioxide as reaction medium and the whole closed loop,non-combustion pyrolysis process of heat transfer mass carrier.System mainly includes three or more than above series operation's high-pressure supercritical carbon dioxide reactor,interwall heat recovery heat exchanger and specific physical solvent absorption tower.In this process, waste tire is heated to 350 DEG C~400 DEG C, pressure is higher than 9MPa CO2 supercritical state.Waste tire macromolecular network occurs high selectivity cleavage and in situ dehydrogenation aromatization reaction, can target generation yield up to 20% of total mass of waste tire high-value p-cymene, while relying on the solvation effect of supercritical fluid completely inhibits or in situ conversion of limonene generation, fundamentally solves the chemical engineering problem that both boiling points are extremely close and difficult to separate.

The invention relates to an acne-removing and repairing composition containing hydrolyzed sponge as well as a preparation method and application of the acne-removing and repairing composition, and belongs to the technical field of cosmetics. According to the present invention, the capryloyl glycine, the hydrolyzed sponge, the o-cymene-5-ol or the quaternary ammonium salt-73 and the schizophyllan are combined, such that the prepared composition has the excellent acne removing effect; meanwhile, the schizophyllan, the ebony seed oil and the sh-pentapeptide-1 are combined for use, so that the prepared composition has the effects of preserving moisture and locking water. The composition finished product prepared by the invention also has a moisturizing effect on the basis of an acne removing effect, so that the phenomenon that the skin barrier is weakened more or less when the components with the acne removing effect take effect is avoided, and further the skin becomes fragile, dry and sensitive; the stable internal environment of the skin is effectively maintained by maintaining the normal moisture content of the skin, the vicious circle of repeated'damage-oil production-acne growth-re-damage 'of the skin is fundamentally avoided, and efficient and deep repair of the skin is effectively realized.

Compound essential oil for alleviating skin aging and a preparation method therefor. The compound essential oil comprises the following components in parts by weight: 60-70 parts of oleic acid, 10-20 parts of linoleic acid, 10-20 parts of palmitic acid, 1-10 parts of stearic acid, 0.1-0.8 parts of cis-11-eicosenoic acid, 0.1-0.8 parts of α-copaene, 0.1-0.6 parts of linolenic acid, 0.1-0.5 parts of α-pinene, 0.1-0.5 parts of trans-caryophyllene, 0.1-0.5 parts of eicosanoic acid, 0.1-0.4 parts of linalool, 0.01-0.4 parts of (+)-δ-cadinene, 0.01-0.3 parts of limonene, 0.01-0.3 parts of behenic acid, 0.01-0.3 parts of palmitoleic acid, 0.01-0.3 parts of β-cedrene, 0.01-0.2 parts of tetracosanoic acid, 0.01-0.2 parts of β-pinene, 0.01-0.1 parts of 3-thujene, 0.01-0.1 parts of myristic acid, 0.01-0.1 parts of α-humulene, 0.01-0.1 parts of (-)-α-gurjunene, 0.01-0.1 parts of α-cedrene, and 0.01-0.1 parts of p-cymene. The compound essential oil is derived from natural and green raw materials, can effectively avoid side effects while treating skin aging, and thus has good safety.

The invention discloses an environment-friendly multifunctional herbicide and a preparation method thereof. The environment-friendly multifunctional herbicide comprises red oil and / or acid water separated during synthesis of 1, 8-terpin from turpentine; the red oil is pinene and isomerization or addition byproducts thereof, and comprises one or more of tricyclene, camphene, carene, limonene, cymene, terpinene, isoterpinene, phellandrene, 1, 4-cineole, 1, 8-cineole, fenchene, fenchol, isoborneol, borneol, 4-terpilenol, beta-terpilenol, alpha-terpilenol and gamma-terpilenol. Compared with turpentine, the herbicide has a broad-spectrum and efficient killing effect and also has killing and repelling effects on pests, and meanwhile, the compounds are easy to naturally degrade in the environment and are non-toxic to human.

The invention belongs to the technical field of cosmetics, and particularly relates to an o-cymene-5-alcohol-containing oil-control antibacterial composition as well as a preparation method and application of the o-cymene-5-alcohol-containing oil-control antibacterial composition. The oil-control antibacterial composition containing the ortho-cymene-5-ol is prepared from the following components in parts by mass: 5 to 15 parts of the ortho-cymene-5-ol, 1 to 10 parts of a black willow bark extract, 5 to 15 parts of a sake yeast extract, 1 to 10 parts of a camellia flower extract and 1 to 10 parts of an abelmoschus esculentus extract. According to the invention, a composite process of enzymolysis pretreatment and carbon dioxide supercritical extraction is adopted, so that active ingredients can be fully extracted on the premise of protecting the structures of the active ingredients from being damaged, and the antibacterial effect is remarkably enhanced; all the components are scientifically compounded, synergistic interaction of the oil control effect is achieved, through the synergistic effect of the components, the oil control rate is increased, the oil control effect is more durable, and the problems of greasy skin, floodlight and the like can be effectively solved.

This invention provides a citrus-flavored beverage that can reduce off-odors while improving flavor, and a technology that can suppress the odor caused by photodegradation of beverages. [Solution] The citrus-flavored beverage of the present invention contains 0.001 ppm to 1 ppm of o-cymene, and 0.001 ppm to 0.6 ppm of octanal, and / or 0.001 ppm to 0.2 ppm of decanal.

The utility model discloses a reaction kettle for synthesizing cymene, which relates to the technical field of cymene synthesis, and comprises a base, a reaction kettle body and a cavity jacket, the reaction kettle body is arranged above the base, the cavity jacket is arranged on the outer surface of the reaction kettle body, the top of the reaction kettle body is provided with a support frame, the top of the support frame is provided with a motor, and the motor is connected with the base. The output end of the motor penetrates through the supporting frame and is provided with a first rotating gear, the first rotating gear is meshed with a second rotating gear, hollow columns are rotationally connected to the interiors of the supporting frame and the reaction kettle body, and the interiors of the second rotating gears are fixedly connected with the outer surfaces of the hollow columns. A spiral blade is further arranged on the outer surface, arranged in the reaction kettle body, of the hollow column, a cleaning assembly for cleaning the interior of the reaction kettle body is arranged on the hollow column, the effect of cleaning the interior of the reaction kettle body is achieved through the cleaning assembly, and residues are prevented from being attached to the inner wall of the reaction kettle body.

A pest control composition includes (i) from about 4 wt% to about 10 wt% of sodium lauryl sulfate; (ii) one or more C5 to C9 hydrotropic salt; (iii) from about 1 wt% to about 10 wt% of one or more active ingredients selected from the group consisting of corn mint oil, peppermint oil, spearmint oil, rosemary oil, thyme oil, citronella oil, clove oil, cedarwood oil, cinnamon oil, geranium oil, eugenol, 2-phenylethyl propionate, menthol, menthone, thymol, carvone, camphor, methyl salicylate, p-cymene, linalool, geraniol, cinnamyl acetate, cinnamic alcohol, cinnamaldehyde, citronellol, eucalyptol / 1,8- cineole, alpha-pinene, bornyl acetate, gamma-terpinene, and combinations thereof; (iv) from 1% to 5% by weight of a solvent, wherein the solvent is a C1-C4 alcohol, and (v) 60 wt% to about 95 wt % of water. The pest control composition exhibits a water peak in a H spectrum having a width encompassing 90% of the area of the entire water signal of about 50 Hz or more, as determined by the H NMR Method. A method of controlling one or more weeds by contacting the said weeds with the pest control composition.

A pest control composition includes from about 4 wt % to about 10 wt % of sodium lauryl sulfate; a C5 to C9 hydrotropic salt; from about 1 wt % to about 12 wt % of one or more active ingredients chosen from corn mint oil, peppermint oil, spearmint oil, rosemary oil, thyme oil, citronella oil, clove oil, cedarwood oil, cinnamon oil, geranium oil, eugenol, 2-phenylethyl propionate, menthol, menthone, thymol, carvone, camphor, methyl salicylate, p-cymene, linalool, geraniol, cinnamyl acetate, cinnamic alcohol, cinnamaldehyde, citronellol, eucalyptol / 1,8-cineole, alpha-pinene, bornyl acetate, gamma-terpinene, or combinations thereof; and from about 60 wt % to about 95 wt % of water. The ratio of hydrotropic salt to sodium lauryl sulfate of from about 0.15 to about 0.9. The pest control composition exhibits a receding contact angle of less than 21 degrees.

This invention discloses a method for identifying tamarind maturity based on aroma markers. Through systematic research, this invention, for the first time, discovers the correlation between eight characteristic aroma markers and tamarind maturity: for unripe tamarind, phenylacetaldehyde, sec-butylamine, 5-acetoxymethyl-2-furfural, and tea spiroane; for ripe tamarind, 5-hydroxymethylfurfural, octanal, p-cymene, and styrene. This method is simple to operate, has an accuracy rate of ≥98%, and is suitable for tamarind harvesting and grading, quality evaluation, and processing quality control.

Provided are a pharmaceutical composition and a use thereof, wherein the pharmaceutical composition comprises α-pinene, p-cymene, β-myrcene, and β-phellandrene. The pharmaceutical composition has good inhibitory activity on rhinovirus and can be used for relieving cough symptoms.

The present invention provides a beverage having a new value in terms of flavor, that is, a beverage in which the intensity of an ink-like aroma is reduced and the complexity of the flavor is enhanced, by utilizing p-cymene that increases in the beverage over time, and a method for producing the same.SOLUTION: The citrus-flavored beverage packed in a container has a p-cymene concentration of ≥ 125 μ g / L and an α - terpineol concentration of ≥ 12 times the p-cymene concentration.SELECTED DRAWING: None

The present invention aims to provide a plant vitality agent and a plant cultivation method that can promote plant growth and also impart to plants resistance to environmental stresses such as drought, extreme heat, and high sodium chloride concentrations. [Solution] A plant vitality agent comprising a plant extract, wherein the plant extract comprises a volatile terpene, and the volatile terpene is one or more selected from the group consisting of terpinen-4-ol, p-cymene, 1,8-cineole, linalool, and α-terpineol, and the weight percentage of the volatile terpene in the plant vitality agent is 0.003 to 90% by weight based on the weight of the plant vitality agent.

The invention provides a skin care composition for resisting inflammation, removing acnes and repairing acne skin as well as a preparation method and application of the skin care composition. The skin care composition disclosed by the invention is prepared from the following raw materials in parts by weight: 14 to 16 parts of compound extract, 2.5 to 3.5 parts of compound acid, 1 to 1.5 parts of hydrolyzed royal jelly extract, 0.8 to 1.2 parts of panthenol, 0.8 to 1.2 parts of dipotassium glycyrrhizinate, 0.8 to 1.2 parts of coconut oil, 0.5 to 0.8 part of ceramide NP, 0.1 to 0.3 part of chlorella extract, 0.1 to 0.2 part of trehalose, 0.1 to 0.2 part of o-cymene-5-alcohol and the balance of water in 100 parts, the composite acid is composed of salicylic acid and azelaic acid; the composite plant extract is composed of an olive leaf extract, a lalang grass rhizome extract and an iris tectorum extract. By using the skin care composition product disclosed by the invention, the facial red area of an acne patient is obviously improved, and the facial porphyrin value and the facial sebum are obviously reduced. The skin care composition provided by the invention can inhibit propionibacterium acnes and the like, has good anti-inflammatory and acne-removing effects, has acne mark repairing capacity, and can better repair damaged acne muscles.

The invention discloses compound essential oil for improving varicosity and a preparation method of the compound essential oil. Comprising the following components: oleic acid, linoleic acid, octanoic acid, decanoic acid, limonene, palmitic acid, alpha-pinene, stearic acid, beta-pinene, gamma-terpinene, 3-cacumen biotae, p-cymene, menthol, menthone, 3-carene, linalool, docosanoic acid, myrcene, sabinene, trans-caryophyllene, isomenthone, citronellol, pulemenone, 4-terpinenol and eudesmol. The compound essential oil disclosed by the invention has excellent effects of improving leg vascular protrusion, obviously improving bluish violet, and relieving soreness and swelling, pain and itching of an affected part.

The invention belongs to the technical field of cosmetics, and relates to a composition with the effects of removing acnes and tightening pores and application of the composition, and the composition is prepared from Philionin, o-cymene-5-ol, bailionin, surfactin, madecassoside, jasmineshu and colloidal sulfur. According to the acne-removing composition, the paigonin, the surfactin, the madecassoside, the Jhenyeshu and the colloidal sulfur can relieve redness and swelling and stimulation caused by acne, the five components have a synergistic effect, and the paigonin, the o-cymene-5-ol and the colloidal sulfur have an antibacterial effect and can improve acne symptoms. The composition disclosed by the invention has an excellent acne removing effect and is mild and non-irritant in effect.

The invention relates to the technical field of skin external preparations, in particular to a colloidal sulfur-based acne-removing composition and a preparation method and application thereof.The colloidal sulfur-based acne-removing composition is at least prepared from, by weight, 10-50 parts of colloidal sulfur, 3-12 parts of ethyl lauroyl arginate hydrochloride, 3-12 parts of palmitoyl proline, 10-50 parts of glycolipid, 3-20 parts of kaolin, 3-12 parts of panthenol and 3-12 parts of o-cymene-5-ol. Colloidal sulfur is introduced to be compounded with specific bioactive components to prepare the composition capable of efficiently resisting acnes, removing blackheads, resisting inflammation and repairing barriers, and the composition can be subsequently added into face cleansing products for synergism.

The invention provides a slow-release diaphorina citri attractant which comprises an attracting part and a slow-release part, wherein the luring part is prepared from the following components in percentage by mass: 1 to 5 percent of p-cymene, 50 to 80 percent of citral, 1 to 5 percent of gamma-terpinene, 1 to 5 percent of linalool, 10 to 20 percent of gamma-terpinene, 1 to 5 percent of carene, 1 to 5 percent of terpinene, 1 to 5 percent of cis-3-hexenol, 1 to 5 percent of n-decanoic acid, 1 to 3 percent of methyl anthranilate and 1 to 2 percent of pyrazine; the slow-release part comprises an adsorption slow-release component and an azeotropic slow-release component. The invention further provides application of the slow-release diaphorina citri attractant, and the slow-release diaphorina citri attractant is used for trapping and killing diaphorina citri. The invention further provides a using method of the slow-release diaphorina citri attractant. The azeotropic slow-release component and the adsorption slow-release component are combined, so that the volatilization efficiency of the luring part is reduced, the stable volatilization speed can be better maintained, the high attractant concentration is maintained within two to three weeks in cooperation with the diaphorina citri outbreak period and the yellow plate effective adhesion time, and the better pest killing effect is achieved.