US20030235601A1 - Insect repellent compounds - Google Patents

Insect repellent compounds Download PDF

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US20030235601A1
US20030235601A1 US10/392,455 US39245503A US2003235601A1 US 20030235601 A1 US20030235601 A1 US 20030235601A1 US 39245503 A US39245503 A US 39245503A US 2003235601 A1 US2003235601 A1 US 2003235601A1
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dihydronepetalactone
article
repellent
insect repellent
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David Hallahan
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EIDP Inc
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Individual
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Priority to US10/392,455 priority Critical patent/US20030235601A1/en
Assigned to E. I. DU PONT DE NEMOURS AND COMPANY reassignment E. I. DU PONT DE NEMOURS AND COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HALLAHAN, DAVID L.
Priority to US10/664,544 priority patent/US20040127553A1/en
Publication of US20030235601A1 publication Critical patent/US20030235601A1/en
Priority to US10/964,415 priority patent/US7232844B2/en
Priority to US10/974,863 priority patent/US20050112166A1/en
Priority to US11/474,595 priority patent/US7547793B2/en
Priority to US11/760,052 priority patent/US20070231357A1/en
Priority to US12/479,888 priority patent/US8633325B2/en
Abandoned legal-status Critical Current

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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
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/02—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms
    • A01N43/04—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom
    • A01N43/14—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom six-membered rings
    • A01N43/16—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom six-membered rings with oxygen as the ring hetero atom
    • 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
    • A01N65/08—Magnoliopsida [dicotyledons]
    • A01N65/22—Lamiaceae or Labiatae [Mint family], e.g. thyme, rosemary, skullcap, selfheal, lavender, perilla, pennyroyal, peppermint or spearmint
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P17/00—Drugs for dermatological disorders
    • A61P17/02—Drugs for dermatological disorders for treating wounds, ulcers, burns, scars, keloids, or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/2525—Coating or impregnation functions biologically [e.g., insect repellent, antiseptic, insecticide, bactericide, etc.]

Definitions

  • the present invention relates to the field of insect repellency, and the use of dihydronepetalactone stereoisomers generally as repellent materials.
  • Repellent substances generally cause insects to be driven away from, or to reject, otherwise insect-acceptable food sources or habitats.
  • Most known repellents are only mildly toxic. A few of the known repellents, in fact, are not active poisons at all but rather prevent damage to plants/animals or articles of manufacture by making insect food sources or living conditions unattractive or offensive.
  • Most current commercial insect repellents contain the synthetic chemical N,N-diethyl-m-toluamide (DEET) as their primary active ingredient.
  • DEET N,N-diethyl-m-toluamide
  • repellents sold under the major commercial brand names such as Off!®, Deep Woods Off!®, and Cutter® are all DEET based products and comprise 85% of insect repellent sales (Consumer Reports Buying Guide, 1994 Special Year-End Issue).
  • DEET DEET
  • DEET is a synthetic chemical having a limited spectrum of activity
  • DEET is a powerful plasticizer and will dissolve or mar many plastics and painted surfaces
  • DEET plasticizes the inert ingredients typically used in topical formulations in order to lengthen the time of effectiveness. This leads to DEET formulations with low user acceptability.
  • DEET-free products with repellent activity are finding favor with consumers, and demand for compositions containing natural products (versus synthetic chemicals such as DEET) is increasing.
  • These DEET-free repellent compounds require a combination of excellent repellency, high residual activity and relatively little or no toxicity to humans (or pets) and the environment.
  • there is an on-going need to develop new repellent compounds which can be obtained from, or synthesized from, natural plant materials and which are pleasant to use.
  • Citronella oil known for its general repellence towards insects, is obtained from the graminaceous plants Cymbopogon winterianus and C. nardus .
  • plants used as sources of fragrant chemicals include Melissa officinalis (Melissa), Perilla frutescens (Perilla), Posostemon cablin (Patchouli) and various Lavandula spp. (Lavender). All of these examples of plants yielding oil of value to the fragrance industry are members of the Labiatae (Lamiaceae) family. Plants of the genus Nepeta (catmints) are also members of this family, and produce an essential oil which is a minor item of commerce. This oil is very rich in a class of monoterpenoid compounds known as iridoids [Inouye, H. Iridoids.
  • Iridoid monoterpenoids have long been known to be effective repellents to a variety of insect species (Eisner, T. Science 146:1318-1320 (1964); Eisner, T. Science 148:966-968 (1965); Peterson, C. and J. Coats, Pesticide Outlook 12:154-158 (2001); and Peterson, C. et al. Abstracts of Papers American Chemical Society, ( 2001) 222 (1-2): AGRO73).
  • U.S. Pat. No. 4,663,346 discloses insect repellants with compositions containing bicyclic iridoid lactones (e.g., iridomyrmecin).
  • U.S. Pat. No. 4,869,896 discloses use of these bicyclic iridoid lactone compositions in potentiated insect repellent mixtures with DEET.
  • One embodiment of this invention is an insect repellent composition or article that contains a dihydronepetalactone, or a mixture of dihydronepetalactone stereoisomers, represented by the general formula:
  • Another embodiment of this invention is a process for fabricating an insect repellent composition or an insect repellent article of manufacture by providing as the composition or article, or incorporating into the composition or article, a diihydronepetalactone, or a mixture of dihydronepetalactone stereoisomers, as described above.
  • a further embodiment of this invention is a method of imparting, augmenting or enhancing the insect repellent effect of an article by incorporating into the article a diihydronepetalactone, or a mixture of dihydronepetalactone stereoisomers, as described above.
  • Yet another embodiment of this invention is the use of a diihydronepetalactone, or a mixture of dihydronepetalactone stereoisomers, as described above as an insect repellent, and thus in a method of repelling insects, the insects are exposed to a diihydronepetalactone, or a mixture of dihydronepetalactone stereoisomers, as described above.
  • FIG. 1 shows the chemical structures of the naturally-occurring iridoid (methylcyclopentanoid) nepetalactones.
  • FIG. 2 shows the total ion chromatograms from combined gas chromatography/mass spectrometry (GC-MS) analysis of a distilled nepetalactone-enriched fraction from commercially-available catmint oil (A), together with that of the material produced from this fraction by hydrogenation (B).
  • GC-MS gas chromatography/mass spectrometry
  • FIG. 3 shows the mass spectra of the major constituents of the nepetalactone-enriched fraction (A) and the hydrogenated material (B) identified by GC-MS analysis.
  • FIG. 4 shows the 13 C NMR analysis performed on a distilled nepetalactone-enriched fraction of commercially-available catmint oil.
  • FIG. 5 shows the 13 C NMR spectrum obtained from analysis of the dihydronepetalactones produced by hydrogenation of a distilled nepetalactone-enriched fraction of commercially-available catmint oil.
  • FIG. 6 shows the distribution of landing density of female Aedes aegyptii mosquitoes on membranes treated with dihydronepetalactones over time in an in vitro repellency test.
  • nepetalactone refers to the compound having the general structure:
  • dihydronepetalactones or “dihydronepetalactone mixtures” refers to any mixture of dihydronepetalactone stereoisomers.
  • the molar or mass composition of each of these isomers relative to the whole dihydronepetalactone composition can be variable.
  • Dihydronepetalactones are abbreviated as “DHN”.
  • insect refers to any member of a large group of invertebrate animals characterized, in the adult state (non-adult insect states include larva and pupa) by division of the body into head, thorax, and abdomen, three pairs of legs, and, often (but not always) two pairs of membranous wings.
  • This definition therefore includes a variety of biting insects (e.g., ants, bees, black flies, chiggers, fleas, green head flies, mosquitoes, stable flies, ticks, wasps), wood-boring insects (e.g., termites), noxious insects (e.g., houseflies, cockroaches, lice, roaches, wood lice), and household pests (e.g., flour and bean beetles, dust mites, moths, silverfish, weevils).
  • biting insects e.g., ants, bees, black flies, chiggers, fleas, green head flies, mosquitoes, stable flies, ticks, wasps
  • wood-boring insects e.g., termites
  • noxious insects e.g., houseflies, cockroaches, lice, roaches, wood lice
  • household pests e.g., flour and bean bee
  • hosts refers to any plant or animal affected by insects. Typically, hosts are considered to be insect-acceptable food sources or insect-acceptable habitats.
  • insect susceptible article will refer to any item of commerce created by man, which is affected by insects. This may include buildings, furniture, and the like. Typically, these articles of manufacture are considered to be insect-acceptable food sources or insect-acceptable habitats.
  • insect repellent or “insect repellent composition” or “repellent composition” will refer to a compound or composition which deters insects from their preferred hosts or insect-suitable articles of manufacture. Most known repellents are not active poisons at all, but rather prevent damage to plants/animals or articles of manufacture by making insect food sources or living conditions unattractive or offensive. Typically, insect repellents are a compound or composition that can be either topically applied to the host; or, the compound or composition is incorporated into an insect susceptible article to produce an insect repellent article that deters insects from the nearby 3-dimensional space in which the host or article exists.
  • the affect of the insect repellent is to drive the insects away from or to reject: 1.) the host, thereby minimizing the frequency of insect “bites” to the host; or 2.) the insect susceptible article, thereby protecting the article from insect damage.
  • Repellents may be in the form of gases (olfactory), liquids, or solids (gustatory).
  • Some examples of well-known insect repellents include: benzil; benzyl benzoate; 2,3,4,5-bis(butyl-2-ene) tetrahydrofurfural (MGK Repellent 11); butoxypolypropylene glycol; N-butylacetanilide; normal-butyl-6,6-dimethyl-5,6-dihydro-1,4-pyrone-2-carboxylate (Indalone); dibutyl adipate; dibutyl phthalate; di-normal-butyl succinate (Tabatrex); N,N-diethyl-meta-toluamide (DEET); dimethyl carbate (endo,endo)-dimethyl bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate); dimethyl phthalate; 2-ethyl-2-butyl-1,3-propanediol; 2-ethyl-1,3-hexanediol (Rut
  • Standard repellents for mosquitoes, ticks, and the like are citronella oil (discussed below), dimethyl phthalate, normal-butylmesityl oxide oxalate and 2-ethyl hexanediol-1,3 (See, Kirk-Othmer Encyclopedia of Chemical Technology, 2 nd Ed., Vol. 11: 724-728; and The Condensed Chemical Dictionary, 8 th Ed., p 756).
  • Effective insect repellents consist of essential oils and/or active ingredients of essential oils.
  • “Essential oils” are defined as any class of volatile oils obtained from plants possessing the odor and other characteristic properties of the plant.
  • repellent compounds that are essential oils include: almond bitter oil, anise oil, basil oil, bay oil, caraway oil, cardamom oil, cedar oil, celery oil, chamomile oil, cinnamon oil, citronella oil, clove oil, coriander oil, cumin oil, dill oil, eucalyptus oil, fennel oil, ginger oil, grapefruit oil, lemon oil, lime oil, mint oil, parsley oil, peppermint oil, pepper oil, rose oil, spearmint oil (menthol), sweet orange oil, thyme oil, turmeric oil, and oil of wintergreen.
  • active ingredients in essential oils are: citronellal, methyl salicylate, ethyl salicylate, propyl salicylate, citronellol, safrole, and limonene.
  • an “insecticide” is a compound or mixture which is capable of poisoning an insect via its oral ingestion, by contact with the insect cuticle, or by fumigant action through the air.
  • an insecticide is a type of pesticide designed to control insect life which is harmful to man (i.e., directly harmful as disease vectors, or indirectly harmful by destruction of crops, food products, or textile fabrics).
  • insecticides include: inorganic compounds (such as arsenic, lead and copper); naturally occurring organic compounds (such as rotenone, pyrethrins, nicotine, copper naphthenate and petroleum derivatives); and synthetic organic compounds (such as DDT, dieldrin, endrin, chlordane, lindane, para-dichlorobenzene and parathion).
  • inorganic compounds such as arsenic, lead and copper
  • naturally occurring organic compounds such as rotenone, pyrethrins, nicotine, copper naphthenate and petroleum derivatives
  • synthetic organic compounds such as DDT, dieldrin, endrin, chlordane, lindane, para-dichlorobenzene and parathion.
  • potentiated insect repellent composition refers to a repellent composition which produces a result substantially in excess of that which reasonably could be expected or predicted from the known effect of the components either alone or additively.
  • a potentiated insect repellent composition will include dihydronepetalactones or a mixture thereof, and at least one other insect repellent compound that is not itself dihydronepetalactone (sometimes referred to as a non-dihydronepetalactone insect repellent compound).
  • insect repellent composition can be used as a component of an “insect repellent article”, wherein the term “insect repellent article” refers to an article of manufacture possessing insect repellency that is enhanced, altered, or augmented by the insect repellent composition.
  • insect repellency the terms “alter” and “modify” in their various forms refer to a means of supplying or imparting insect repellency to a composition, or augmenting the existing insect repellency characteristics where natural repellency is deficient in some regard, or supplementing the existing insect repellency to modify its quality, or character.
  • the term “enhance” is intended to mean the intensification (without effecting a change in kind or quality of repellency) of one or more repellency properties in an insect repellent composition or insect repellent article.
  • the insect repellent composition of this invention also functions as a fragrance composition since it is capable of imparting a pleasing fragrance or aroma to the insect repellent composition or to an insect repellent article.
  • Dihydronepetalactones are useful in an insect repellent composition or article to enhance, alter, or augment the overall aroma or fragrance of the composition or article.
  • fragrance the terms “alter” and “modify” in their various forms refer to a means of supplying or imparting a fragrance or aroma character or note to otherwise bland substances or augmenting the existing aroma characteristics where natural aroma is deficient in some regard or supplementing the existing aroma impression to modify its quality, character, or aroma.
  • the term “enhance” is intended to mean the intensification (without effecting a change in kind or quality of aroma) of one or more aroma nuances and their organoleptic impression of a fragrance, perfume composition, or one or more perfumed articles.
  • fragment composition is used herein to mean a mixture of organic compounds including, for example, alcohols, aldehydes, ketones, nitriles, esters, lactones, natural essential oils, synthetic essential oils, and mercaptans, which are admixed so that the combined odors of the individual components produce a pleasant or desired fragrance.
  • Such compositions usually contain: (1) the main note or the “bouquet” or foundation stone of the composition; (2) modifiers which round off and accompany the main note; (3) fixatives which include odorous substances which lend a particular note to the perfume throughout all stages of evaporation and substances which retard evaporation; and (4) top notes which are usually low-boiling, fresh-smelling materials.
  • the individual component will contribute its particular olfactory characteristics, but the overall effect of the composition will be the sum of each of the effects of each of the ingredients.
  • the dihydronepetalactones of this invention or mixtures thereof can be used to alter the aroma characteristics of such compositions, for example, by highlighting or moderating the olfactory reaction contributed by another ingredient in the composition.
  • Dihydronepetalactones are known in the literature, for example as minor constituents of the essential oils of several labiate plants of the genus Nepeta (Regnier, F. E., et al. Phytochemistry 6:1281-1289 (1967); DePooter, H. L., et al. Flavour and Fragrance Journal 3:155-159 (1988); Handjieva, N. V. and S. S. Popov J. Essential Oil Res. 8:639-643 (1996)). Additionally, dihydronepetalactones have been identified as constituents of the defensive secretions of certain insects, including rove beetles (Jefson, M., et al. J. Chem. Ecol.
  • One preferred and convenient method for synthesis of the dihydronepetalactone mixtures of the present invention is by hydrogenation of nepetalactone.
  • Catalysts such as platinum oxide and palladium supported on strontium carbonate give dihydronepalactone in 24-90% yields (Regnier, F. E., et al. Phytochemistry 6:1281-1289 (1967)).
  • Nepetalactone is a known material that can be conveniently obtained in relatively pure form from the essential oils isolated by various means from plants of the genus Nepeta (catmints).
  • oils are well known in the art, and examples of methodology for oil extraction include (but are not limited to) steam distillation, organic solvent extraction, microwave-assisted organic solvent extraction, supercritical fluid extraction, mechanical extraction and enfleurage (initial cold extraction into fats followed by organic solvent extraction).
  • repellent materials in accordance with the present invention include a mixture of any or all of the possible stereoisomers of dihydronepetalactone. More preferred repellent materials include a mixture of (9S)-dihydronepetalactones. Most preferred are (9S)-dihydronepetalactone stereoisomers derived from (7S)-nepetalactones.
  • the resulting mixture of isomer products may be separated by a conventional method (e.g., preparative liquid chromatography) to yield each highly purified pair of dihydronepetalactone diastereomers.
  • a conventional method e.g., preparative liquid chromatography
  • chemotypes Plants of a single species exhibiting different oil compositions are termed chemotypes, and it has been shown that in Nepeta racemosa , chemotypes exhibiting marked differences in the proportion of different nepetalactone stereoisomers exist (Clark, L. J., et al., supra).
  • the preferred process for producing specific dihydronepetalactone enantiomers would be hydrogenation of an oil from a Nepeta chemotype known to contain specific nepetalactone stereoisomers.
  • the preferred process for producing the dihydronepetalactones represented by Formula I in the present invention is by hydrogenation of nepetalactones from plants with oils of defined nepetalactone stereoisomer content, an industrially advantageous approach in terms of production cost and its biological basis.
  • Other processes are as disclosed in U.S. Provisional Application No. 60/369,470, filed Apr. 3, 2002.
  • the dihydronepetalactones of the present invention possess unique properties of insect repellency and are particularly effective against a wide spectra of common insect pests, including biting insects, wood-boring insects, noxious insects, and household-pests.
  • insects which interfere with human society.
  • insects include a variety of biting insects (e.g., ants, bees, black flies, chiggers, fleas, green head flies, mosquitoes, stable flies, ticks, wasps), wood-boring insects (e.g., termites), noxious insects (e.g., houseflies, cockroaches, lice, roaches, wood lice), and household pests (e.g., flour and bean beetles, dust mites, moths, silverfish, weevils).
  • these repellent properties are additionally effective for preventing infection with such diseases.
  • a wide variety of compounds possess insect repellent and/or mosquito repellent activity as evidenced by: 1.) the diversity of chemical structures reported by the USDA to contain repellent activity (Chemicals Evaluated as Insecticides and Repellents at Orlando, Fla., compiled by W. V. King, U.S. Department of Agriculture, Agricultural Research Service, Agriculture Handbook No. 69); and 2.) by the variety of insect repellant active materials present in insect repellent formations (See, e.g., European patent applications 97,812 and 97,813, and U.S. Pat. No. 4,127,672, U.S. Pat. No. 4,756,905, U.S. Pat. No. 5,465,685, U.S. Pat. No.
  • repellents form an unusual class of compounds where evaporation of the active ingredient from the host's skin surface or from the insect repellent article is necessary for effectiveness, as measured by the host's protection from insect bites or the article's protection from insect damage.
  • a topical insect repellent a certain minimum concentration of repellent is needed in the air space directly above the skin surface of the host in order to repel insects, and this concentration is a measure of the potency of the repellent.
  • the active ingredient could be formulated with polymers and inert ingredients added to the active ingredient for the purpose of modifying the persistence of the active ingredient on the host's skin surface or within the insect repellent article.
  • adding inert ingredients to the active ingredient limits the number of molecules of active ingredient on the surface of the repellent film or article. Since a molecule must be on the surface in order to evaporate, the evaporation rate is lowered.
  • the active ingredient can be contained in microcapsules to control rates of loss from the host's skin surface or insect repellent article.
  • another technique of limiting the evaporation rate of active ingredient is to synthesize a precursor molecule, which slowly disintegrates on the skin surface or insect repellent article to release the active ingredient.
  • release of the active ingredient may be, for example, by sub-micron encapsulation, in which the active ingredient is encapsulated (surrounded) within a skin nourishing protein just the way air is captured within a balloon.
  • the protein may be used at, for example, a 20% concentration.
  • An application of repellent contains many of these protein capsules that are suspended in either a water-based lotion, or water for spray application. After contact with skin the protein capsules begin to breakdown releasing the encapsulated dihydronepetalactone. The process continues as each microscopic capsule is depleted then replaced in succession by a new capsule that contacts the skin and releases its active ingredient. The process may take up to 24 hours for one application.
  • each repellent must have a minimum effective evaporation rate (MEER) from the skin surface or insect repellent article to maintain the necessary minimum concentration of repellent in the air space directly above the skin surface/article for effective insect repellency.
  • MEER minimum effective evaporation rate
  • An evaporation rate greater than the minimum effective evaporation rate (MEER) results in a significant and undesirable mode of loss.
  • the issue is further complicated, however, since the MEER will change as a function of conditions in the field.
  • Both the avidity or biting tendency of an insect and the concentration of insects in the host's environment must be considered. For example, as the avidity of mosquitoes increases, a higher MEER will be required.
  • the MEER In an environment having a low concentration of mosquitoes where those mosquitoes are not hungry, the MEER could be as low as 2, or more commonly 5, or 6. In contrast, in an environment having a high concentration of hungry mosquitoes, the MEER might be as high as 12-15.
  • Preferred in the present invention are insect compositions wherein the skin surface evaporation rate is at least equal to a minimum effective evaporation rate over a period of time where a preferred period of time is about 5 hours.
  • a variety of carriers or diluents for the above-disclosed dihydronepetalactones can be used.
  • the carrier allows the formulation to be adjusted to an effective concentration of repellant molecules.
  • the repellant molecules are mixed in a dermatologically acceptable carrier.
  • the carrier may further provide water repellency, prevent skin irritation, and/or soothe and condition skin.
  • Factors to consider when selecting a carrier(s) for any formulation of insect repellent include commercial availability, cost, repellency, evaporation rate, odor, and stability. Some carriers can themselves have repellent properties.
  • the specific choice of a carrier, if any, to be utilized in achieving the desired intimate admixture with the final product can be any carrier conventionally used in insect repellent formulations.
  • the carrier moreover, should preferably also be one that will not be harmful to the environment.
  • the carrier can be any one of a variety of commercially available organic and inorganic liquid, solid, or semi-solid carriers or carrier formulations usable in formulating insect repellent products.
  • the carrier may include silicone, petrolatum, lanolin or many of several other well known carrier components.
  • organic liquid carriers examples include liquid aliphatic hydrocarbons (e.g., pentane, hexane, heptane, nonane, decane and their analogs) and liquid aromatic hydrocarbons.
  • liquid aliphatic hydrocarbons e.g., pentane, hexane, heptane, nonane, decane and their analogs
  • liquid aromatic hydrocarbons examples include oils produced by the distillation of coal and the distillation of various types and grades of petrochemical stocks, including kerosene oils which are obtained by fractional distillation of petroleum.
  • Other petroleum oils include those generally referred to as agricultural spray oils (e.g., the so-called light and medium spray oils, consisting of middle fractions in the distillation of petroleum and which are only slightly volatile). Such oils are usually highly refined and may contain only minute amounts of unsaturated compounds. Such oils, moreover, are generally. paraffin oils and accordingly can be emulsified with water and an emulsifier, diluted to lower concentrations, and used as sprays. Tall oils, obtained from sulfate digestion of wood pulp, like the paraffin oils, can similarly be used.
  • Other organic liquid carriers can include liquid terpene hydrocarbons and terpene alcohols such as alpha-pinene, dipentene, terpineol, and the like.
  • Other carriers include silicone, petrolatum, lanolin, liquid hydrocarbons, agricultural spray oils, paraffin oil, tall oils, liquid terpene hydrocarbons and terpene alcohols, aliphatic and aromatic alcohols, esters, aldehydes, ketones, mineral oil, higher alcohols, finely divided organic and inorganic solid materials.
  • the carrier can contain conventional emulsifying agents which can be used for causing the dihydronepetalactone compounds to be dispersed in, and diluted with, water for end-use application.
  • Still other liquid carriers can include organic solvents such as aliphatic and aromatic alcohols, esters, aldehydes, and ketones.
  • Aliphatic monohydric alcohols include methyl, ethyl, normal-propyl, isopropyl, normal-butyl, sec-butyl, and tert-butyl alcohols.
  • Suitable alcohols include glycols (such as ethylene and propylene glycol) and pinacols.
  • Suitable polyhydroxy alcohols include glycerol, arabitol, erythritol, sorbitol, and the like.
  • suitable cyclic alcohols include cyclopentyl and cyclohexyl alcohols.
  • liquid carriers include relatively high-boiling petroleum products such as mineral oil and higher alcohols (such as cetyl alcohol).
  • stabilizers e.g., tert-butyl sulfinyl dimethyl dithiocarbonate
  • tert-butyl sulfinyl dimethyl dithiocarbonate can be used in conjunction with, or as a component of, the carrier or carriers comprising the compositions of the present invention.
  • Solid carriers which can be used in the compositions of the present invention include finely divided organic and inorganic solid materials.
  • Suitable finely divided solid inorganic carriers include siliceous minerals such as synthetic and natural clay, bentonite, attapulgite, fuller's earth, diatomaceous earth, kaolin, mica, talc, finely divided quartz, and the like, as well as synthetically prepared siliceous materials, such as silica aerogels and precipitated and fume silicas.
  • Examples of finely divided solid organic materials include cellulose, sawdust, synthetic organic polymers, and the like.
  • semi-solid or colloidal carriers examples include waxy solids, gels (such as petroleum jelly), lanolin, and the like, and mixtures of well-known liquid and solid substances which can provide semi-solid carrier products, for providing effective repellency within the scope of the instant invention.
  • Insect repellent compositions of the present invention containing the dihydronepetalactones may also contain adjuvants known in the art of personal care product formulations, such as thickeners, buffering agents, chelating agents, preservatives, fragrances, antioxidants, gelling agents, stabilizers, surfactants, emolients, coloring agents, aloe vera, waxes, other penetration enhancers and mixtures thereof, and therapeutically or cosmetically active agents.
  • adjuvants known in the art of personal care product formulations, such as thickeners, buffering agents, chelating agents, preservatives, fragrances, antioxidants, gelling agents, stabilizers, surfactants, emolients, coloring agents, aloe vera, waxes, other penetration enhancers and mixtures thereof, and therapeutically or cosmetically active agents.
  • compositions of the present invention may also contain other adjuvants such as one or more therapeutically or cosmetically active ingredients.
  • therapeutic or cosmetically active ingredients useful in the compositions of the invention include fungicides, sunscreening agents, sunblocking agents, vitamins, tanning agents, plant extracts, anti-inflammatory agents, anti-oxidants, radical scavenging agents, retinoids, alpha-hydroxy acids, emollients, antiseptics, antibiotics, antibacterial agents or antihistamines, and may be present in an amount effective for achieving the therapeutic or cosmetic result desired.
  • Dihydronepetalactones may be utilized in the present invention individually or combined in any proportion.
  • the desired amount of an insect repellent composition to be added to a given insect susceptible article with properties of insect repellency is determined by the nature of the product and other factors. These factors include both considerations of cost and the nature of the other ingredients in the insect repellent composition or repellent article, their amounts, and the desired repellency effect.
  • the composition of the repellent should contain sufficient amounts of active insect repellant material to be efficacious in repelling the insect from the host over a prolonged period of time (preferably, for a period of at least several hours).
  • each dihydronepetalactone of Formula I or mixtures thereof in an insect repellent composition or repellent article in accordance with the present invention will generally not exceed about 80% by weight based on the weight of the final product, however, greater amounts may be utilized in certain applications and this amount is not limiting. More preferably, a suitable amount of dihydronepetalactone will be at least about 0.001% by weight and preferably about 0.01% up to about 50% by weight; and more preferably, from about 0.01% to about 20% weight percent, based on the weight of the composition or article. Specific compositions will depend on the intended use.
  • the dihydronepetalactone repellent compositions of the present invention can be formulated without a carrier and be effective. More often, however, the insect repellent composition will include a carrier and contain about 0.001-50% weight of the disclosed compounds, and such compound is usually in intimate mixture with the carrier to bring the active material into position for repelling common insect pests, such as biting insects, wood-boring insects, noxious insects, household pests, and the like.
  • compositions of the invention may be formulated and packaged so as to deliver the product in a variety of forms including as a solution, suspension, cream, ointment, gel, film or spray, depending on the preferred method of use.
  • the carrier may be an aerosol composition adapted to disperse the dihydronepetalactone into the atmosphere by means of a compressed gas.
  • the dihydronepetalactone repellent compositions of the present invention can be formulated with at least one other insect repellent that is not itself dihydronepetalactone to create a potentiated insect repellent composition (see, for example, U.S. Pat. No. 4,869,896).
  • the effect of the dihydronepetalactone and the at least one other insect repellent produce a repellency result substantially in excess of that which reasonably could be expected or predicted from the known effect of the components either alone or additively.
  • Exemplary other insect repellent compounds which may be used in a potentiated insect repellent composition with dihydronepetalactones include, but are not limited to: benzil; benzyl benzoate; 2,3,4,5-bis(butyl-2-ene) tetrahydrofurfural (MGK Repellent 11); butoxypolypropylene glycol; N-butylacetanilide; normal-butyl-6,6-dimethyl-5,6-dihydro-1,4-pyrone-2-carboxylate (Indalone); dibutyl adipate; dibutyl phthalate; di-normal-butyl succinate (Tabatrex); N,N-diethyl-meta-toluamide (DEET); dimethyl carbate (endo,endo)-dimethyl bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate); dimethyl phthalate; 2-ethyl-2-butyl-1,3-propaned
  • Preferred is a potentiated insect repellent composition comprising dihydronepetalactones (or a mixture thereof) and DEET, Bayrepel or p-menthane-3,8-diol. Most preferred is a potentiated insect repellent composition comprising dihydronepetalactones (or a mixture thereof) and other natural repellent molecules such as p-menthane-3,8-diol.
  • Desirable properties of a topical insect repellent article include low toxicity, resistance to loss by water immersion or sweating, low or no odor or at least a pleasant odor, ease of application, and rapid formation of a dry tack-free surface film on the host's skin.
  • the formulation for a topical insect repellent article should permit insect-infested animals (e.g., dogs with fleas, poultry with lice, cows with ticks, and humans) to be treated with an insect repellent composition of the present invention by contacting the skin, fur or feathers of such an animal with an effective amount of the repellent article for repelling the insect from the animal host.
  • Embodiments of the present invention which may be used as a topical insect repellent articles, include (but are not limited to): colognes, lotions, sprays, creams, gels, ointments, bath and shower gels, foam products (e.g., shaving foams), makeup, deodorants, shampoo, hair lacquers/hair rinses, and personal soap compositions (e.g., hand soaps and bath/shower soaps).
  • This invention also relates to the use of dihydronepetalactone mixtures as insect repellents in a variety of articles which are susceptible to attack by insects.
  • These outdoor consumable products will generally, but not necessarily, comprise an insect repellent composition of the invention, but will contain an effective amount of dihydronepetalactone.
  • Typical articles that can be improved by the use of dihydronepetalactones and mixtures thereof include, but are not limited to: air fresheners, candles, other scented articles, fibers, sheets, cloth [e.g., for clothing, nettings (mosquito netting), and other fabrics], paper, paint, ink, clay, woods, furniture (e.g., for patios and decks), carpets, sanitary goods, plastics, polymers, and the like.
  • the dihydronepetalactone compositions of this invention may be blended with polymers, which may also involve a controlled release systems.
  • Compatible polymers may or may not be biodegradable.
  • Exemplary polymers are high density polyethylene or low density polyethylene, biodegradable thermoplastic polyurethanes, biodegradable ethylene polymers, and poly(epsilon caprolactone) homopolymers and compositions containing the same as disclosed in U.S. Pat. No. 4,496,467, U.S. Pat. No. 4,469,613 and U.S. Pat. No. 4,548,764.
  • Dihydronepetalactones are particularly advantageous for use as repellent materials in preparations of the present invention for a variety of reasons.
  • the compounds are cost effective to produce, an important consumer consideration when choosing an effective repellent.
  • Many commerically available repellent products are only effective in relatively concentrated form, including as much as 5-30% (or more) repellent in a carrier, based on total weight.
  • U.S. Pat. No. 4,416,881 to McGovern et al. discloses repellent concentrations of 6.25-25% repellent in a carrier.
  • the compounds are known natural compounds, thus overcoming concerns raised against synthetic chemicals such as DEET as the primary active ingredient in repellent compositions.
  • the compositions also possess a unique and pleasant fragrance.
  • the fragrance notes of the subject compounds make them useful in imparting, altering, augmenting or enhancing the overall olfactory component of an insect repellent composition or article, for example, by utilizing or moderating the olfactory reaction contributed by one or more other ingredients in the composition.
  • the dihydronepetalactones of the invention or mixtures thereof may be utilized to either mask or modify the odor contributed by other ingredients in the formulation of the final repellent composition or article, and/or to enhance consumer appeal of a product by imparting a characteristic perfume or aroma. It is expected that the pleasant fragrance of dihydronepetalactones will possess much greater appeal to consumers than other insect repellent compounds, particularly DEET.
  • FIG. 2A presents the GC-MS total ion chromatogram of the nepetalactone-enriched fraction prepared by fractional distillation of the commercial sample of Nepeta cataria essential oil. The conditions employed were: column HP5-MS, 25 m ⁇ 0.2 mm; oven 120° C., 2 min, 15° C./min, 210° C., 5 min.; He @ 1 ml/min. Peaks with m/z 166 are nepetalactones). The unlabelled peaks correspond to minor sesquiterpenoid contaminants.
  • FIG. 3A the mass spectrum of the major peak (6.03 min, nepetalactone) in FIG.
  • nepetalactones were present in the following proportions: 80.2 mol % cis,trans-nepetalactone, 17.7 mol % trans,cis-nepetalactone and 2.1 mol % cis,cis-nepetalactone.
  • GC-MS analysis of this purified fraction indicated that it consisted predominantly of these nepetalactones (m/z 166), accompanied by trace amounts of the sesquiterpenoids caryophyllene and humulene (data not shown).
  • the dihydronepetalactone mixture prepared in accordance with Example 2 was evaluated for its repellent effects against female Aedes aegypti mosquitoes. These tests were carried out under contract by Insect Control & Research, Inc. (Baltimore, Md.).
  • Table 3 presents the effect of dihydronepetalactone concentration with respect to the amount of time taken before the female A. aegypti mosquitoes first probed each membrane. TABLE 3 Effect of Dihydronepetalactone Concentraton on Mean Time to “First Probing” Repellent Concentration Mean Time (min) Isopropyl alcohol (untreated 4.6 control) 1% DEET (positive control) 12 1% DHN 8 2.5% DHN 9.3 5% DHN 18
  • trans,cis-nepetalactone (4aS, 7S, 7aS- or E,Z-nepetalactone)
  • trans,cis-nepetalactone 4aS, 7S, 7aS- or E,Z-nepetalactone
  • the cis,trans-(Z,E-) nepetalactone or unfractionated catmint essential oil in repelling the german cockroach Pieris, C. J. et al. (2002) Household and Structural Insects, 95 (2), 377-380.
  • Nepetalactone was purified from the concentrated extract by silica gel chromatography in hexane/ethyl acetate (9:1) followed by preparative thin-layer chromatography on silica using the same solvent mixture. After removal of the solvent and re-dissolving in hexane, the trans,cis-nepetalactone was crystallized on dry ice. GC-MS and NMR ( 1 H and 13 C) analysis confirmed the identity of the crystalline material as trans,cis-nepetalactone. The 13 C chemical shifts, compared to the chemical shifts of Table 1, are shown in Table 5.
  • Example 4 The dihydronepetalactone prepared according to Example 4, consisting predominantly of 1 S,9S,5R,6R-5,9-dimethyl-3-oxabicyclo[4.3.0]nonan-2-one; Formula 4, was tested for repellency against Aedes aegypti mosquitoes essentially as described in Example 3.
  • the experimental design is summarized in Table 6, and all data presented is from five replicate experiments.
  • Table 7 presents the effect of dihydronepetalactone concentration with respect to the amount of time taken before the female A. aegyptii mosquitoes first probed each membrane. TABLE 7 Effect of Dihydronepetalactone Concentraton on Mean Time to “First Probing” Repellent Concentration Mean Time (min) Isopropyl alcohol (untreated control) 8.0 1% DEET (positive control) 14.8 1% DHN 16.0 0.5% DHN 10.4 0.2% DHN 8.4
  • Dihydronepetalactone at 1% concentration was found to discourage mosquito “first probing” for approximately 16 min, marginally better than (but statistically indistinguishable from) DEET at the same concentration, where mean time to first probe was 14.8 min.
  • Lower concentrations of dihydronepetalactone (0.5% and 0.2% w/v) were found to inhibit first probing for an average of 10.4 and 8.4 min, respectively.

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AU2003214243A1 (en) 2003-10-08
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US7232844B2 (en) 2007-06-19
RU2004130863A (ru) 2005-04-10
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US20050112166A1 (en) 2005-05-26
US20050069568A1 (en) 2005-03-31
CA2479123A1 (en) 2003-10-02
ZA200406233B (en) 2006-06-28
ES2397512T3 (es) 2013-03-07
BRPI0308639B1 (pt) 2019-08-27
CN100521939C (zh) 2009-08-05
HK1079659A1 (zh) 2006-04-13
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KR20040097182A (ko) 2004-11-17
CA2479123C (en) 2013-02-12

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