Classifications

• • 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
  • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
  • A01N59/04—Carbon disulfide; Carbon monoxide; Carbon dioxide

Definitions

• the invention relates to an aqueous acaricidal solution. It also relates to the use of such an aqueous solution.
• aqueous acaricide solution an aqueous solution causing the death of the mites.
• the mites can be in the state of eggs, larvae or adults.
• the action of the aqueous solution can be direct. It can also be indirect, for example when the aqueous acaricide solution destroys a substance necessary for the survival of the mite.
• Dust mites are small arachnids, with dimensions close to a tenth of a millimeter, which develop in particular in bedding and carpets of dwellings and likely to cause allergic reactions in humans. Their optimal living conditions require a humidity between 55 and 85% and a temperature between 15 and 35 ° C. Dust mites mainly feed on dander and organic matter which accumulate in thick textiles. The average adult human loses 1.5 g of dead skin per day, which is enough to feed 1.5 million mites.
• acaricide compositions in powder form are difficult to apply homogeneously and to penetrate the heart of the textile.
• the invention aims to provide an aqueous, natural and harmless solution for humans, making it possible to eliminate mites in a simple, effective and economical manner.
• the invention relates to an aqueous acaricidal solution comprising at least 10 g / l of sodium bicarbonate.
• Sodium bicarbonate is known to be harmless to humans. It is even authorized by various organizations (such as the FDA in the United States) in human food. It has been observed that the mites do not absorb the aqueous acaricidal solution according to the invention but that, upon evaporation of the water, the sodium bicarbonate crystallizes in the form of extremely fine grains. These fine grains adhere to the outer surface of the mites. Without wishing to be bound by a theoretical explanation and without excluding other modes of action, the inventor thinks that the grains of bicarbonate deteriorate certain equilibria of membrane exchanges in the cuticle of the mite and the shell of the egg, which would induce their dehydration and ultimately their death.
• the aqueous acaricide solution comprises at least 10 g / l of sodium bicarbonate. It is unnecessary for it to include more than 100 g / l. It is recommended that it contain at least 30 g / 1 of sodium bicarbonate, preferably 40 g / 1. It is advantageous if the aqueous solution does not comprise more than 80 g / l of sodium bicarbonate, preferably 60 g / l. Acaricidal aqueous solutions comprising from 40 to 60 g / l of sodium bicarbonate are particularly suitable.
• the aqueous solution does not comprise any other acaricidal substance.
• the only acaricide active ingredient is sodium bicarbonate.
• the aqueous solution does not contain any neurotoxic substance "such as pyrethrum or permethrin.
• the invention also relates to the use of the aqueous solution according to the invention described above for its acaricidal effects, in particular for the processing elements of the human environment.
• elements of the human environment is meant the interior elements of the buildings in which humans live, such as offices or residences.
• material elements with which man is in contact conducive to the development of mites.
• elements include for example: bedding (mattresses, pillows, textiles for bedding), rugs, carpets, armchairs, textiles for clothing, plush and fleeces.
• the aqueous solution according to the invention which is natural and harmless to humans is particularly suitable for the treatment of carpets, rugs and textiles for bedding and clothing.
• the aqueous solution according to the invention correctly penetrates into the texture to be treated. It can be applied in particular by brushing, spraying or immersion.
• the aqueous solution is applied by spraying. Sprinkling consists to form very fine droplets and to project these onto the element to be treated. Spraying can be assisted by the expansion of a gas, which improves the projection of the droplets. It is then commonly called “spray".
• the quantity of aqueous acaricide solution to be applied, per square meter, can vary depending on the nature of the surface to be treated.
• the aqueous solution is applied to the element to be treated by immersion of the latter in the aqueous solution.
• the immersion time must be sufficient to ensure correct penetration of the aqueous solution into the element to be treated.
• Mites (Dermatophagoides pteronyssinus) were used, originating from a laboratory strain reared on a substrate composed of a 50/50 mixture (mass / mass) of wheat germ and brewer's yeast in flakes calibrated by sieving (fragments of size less than 1 mm).
• the temperature was between 23 and 25 ° C and the relative humidity maintained at 75% by the presence of a saturated solution of ammonium sulfate ([(NH4) 2 SO4]); the strain was kept in the dark.
• Standard cotton plots (150g / m 2 ) were previously infested with around 200 mites of all stages.
• the cotton plots were then treated by spraying with an aqueous solution obtained by mixing 10, 30 or 50 g / 1 of sodium bicarbonate in water.
• a control batch of mites was followed in parallel to know the natural mortality of the mites subjected to spraying with the same volume of water. Each experimental series was repeated three times and averages of the mortality results obtained were taken.
• Example 2 in which the cotton patch is infested with mites before being treated, illustrates the curative miticide effect of the solution according to the invention.
• Example 2 in which the cotton patch is infested with mites before being treated, illustrates the curative miticide effect of the solution according to the invention.
• Example 2 The procedure was as in Example 1 except that the aqueous acaricidal solution was not applied by spraying but that the standard cotton plots (150 g / m 2 ) were immersed in baths of sodium bicarbonate solution.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Agronomy & Crop Science (AREA)
• Inorganic Chemistry (AREA)
• Pest Control & Pesticides (AREA)
• Plant Pathology (AREA)
• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Dentistry (AREA)
• General Health & Medical Sciences (AREA)
• Wood Science & Technology (AREA)
• Zoology (AREA)
• Environmental Sciences (AREA)
• Agricultural Chemicals And Associated Chemicals (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)

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Citations (3)

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• 2002
  • 2002-12-19 FR FR0216447A patent/FR2848779B1/fr not_active Expired - Fee Related
• 2003
  • 2003-12-18 AU AU2003298207A patent/AU2003298207A1/en not_active Abandoned
  • 2003-12-18 WO PCT/EP2003/014523 patent/WO2004056183A1/fr not_active Ceased
  • 2003-12-18 EP EP03795923A patent/EP1575361A1/fr not_active Withdrawn
  • 2003-12-18 JP JP2004561350A patent/JP4771700B2/ja not_active Expired - Fee Related
  • 2003-12-18 US US10/539,564 patent/US20060159777A1/en not_active Abandoned
• 2011
  • 2011-03-08 JP JP2011050217A patent/JP2011148807A/ja active Pending

Patent Citations (3)

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