JP2009191052A - Pollen scatter inhibitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pollen scatter inhibitor having a sharp activity toward male organs without affecting tree main bodies, branches and leaves. <P>SOLUTION: This pollen scatter inhibitor comprises incorporating an ester of oleic acid or linoleic acid with a ≥4C polyhydric alcohol by 0.5 to 30% and stabilizing emulsion by a surfactant. For example, it can be sprinkled e.g. to Japanese cedar for a relatively long period of time from August when male flowers adhere, to October or November when the pollen granules grow, and prevents the scatter of the pollens in next spring time effectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pollen scattering inhibitor for preventing pollen of plants from scattering.

  Of the pollen present in the male organs of plants, airborne pollen scatters in the air on the wind and adheres to female organs for fertilization. If a person inhales this pollen, a serious symptom called so-called hay fever may be caused. Especially in hay fever caused by pollen such as cedar, cypress or ragweed, allergic symptoms occur in the eyes and nose. People who are troubled by the trend are increasing year by year. Measures against such pollen damage include the administration of antihistamines and corticosteroids, the use of eye drops and masks, etc. The most effective measure is to prevent pollen from flying into the air. is there.

  As a means to prevent pollen from flying into the air, it is possible to cut down the trees that cause it and to weed out the vegetation. There is a problem that it sometimes causes adverse effects such as destruction of the natural environment.

  In addition to cutting trees and weeding trees, it has been proposed to spray or apply certain drugs to male organs as a means of preventing pollen scattering. As an example of such a chemical | medical agent, what uses the vegetable oil and fat (patent document 1) and sodium oleate (patent document 2) which have oleic acid or linoleic acid as a main component as an active ingredient is disclosed.

However, since these drugs have a relatively slow action on male organs, there is a drawback that the spraying time of the drugs is limited to August, which is the flowering period of male flowers.
JP 05-238902 A Japanese Patent Application Laid-Open No. 07-053307

  An object of the present invention is to provide a pollen scattering inhibitor having a sensitive action on a male organ without affecting the main body and branches and leaves of the tree.

  As a result of diligent research to solve the above-mentioned problems, the present inventor has found that an ester of oleic acid or linoleic acid and a polyhydric alcohol having 4 or more carbon atoms has a sensitive action on a male organ of a plant. The present invention has been completed.

  That is, the present invention is a pollen scattering inhibitor containing an ester of oleic acid or linoleic acid and a polyhydric alcohol having 4 or more carbon atoms.

  In a preferred embodiment, the pollen scattering inhibitor is an emulsion containing 0.5 to 30% by mass of an ester of oleic acid or linoleic acid and a polyhydric alcohol having 4 or more carbon atoms.

  ADVANTAGE OF THE INVENTION According to this invention, the pollen scattering inhibitor with the effect | action with respect to a male organ can be provided, without affecting a tree main body and branches and leaves.

  The pollen scattering inhibitor of the present invention contains an ester of oleic acid or linoleic acid and a polyhydric alcohol having 4 or more carbon atoms. Esters of fatty acids other than oleic acid or linoleic acid and polyhydric alcohols having 4 or more carbon atoms are not sensitive to male organs, and are sensitive to male organs but may affect tree bodies and leaves. Absent.

  Esters of oleic acid or linoleic acid and polyhydric alcohols having 4 or more carbon atoms can be obtained from ordinary dehydration reaction of fatty acids and polyhydric alcohols. Esters of oleic acid or linoleic acid and polyhydric alcohols having 4 or more carbon atoms esterify part or all of the hydroxyl groups of the polyhydric alcohol by adjusting the charged molar ratio of fatty acid to polyhydric alcohol. Can be obtained.

  The polyhydric alcohol having 4 or more carbon atoms used for the reaction with oleic acid or linoleic acid may be any as long as it has 4 or more carbon atoms. For example, 1,2-butanediol, 1,3-butanediol, 1 , 4-butanediol, pentaerythritol, neopentyl glycol, 1,5-pentanediol, trimethylolethane, trimethylolpropane, 3-methyl-1,5-pentanediol, 1,2-hexanediol, 1,6- Hexanediol, 1,2,6-hexanetriol, hexylene glycol, dipropylene glycol, tripropylene glycol, 2-butyl-2-ethyl-1,3-propanediol, ditrimethylolpropane, diglycerin, triglycerin, etc. can give. Ethylene glycol, a polyhydric alcohol with 2 carbon atoms, and ester of propylene glycol with 3 carbon atoms with oleic acid or linoleic acid are sensitive to male organs, but are preferred because they affect the tree body and branches and leaves. Absent.

  In use, the pollen scattering inhibitor of the present invention is preferably made into an emulsion by adding a surfactant to an ester of oleic acid or linoleic acid and a polyhydric alcohol having 4 or more carbon atoms. Here, the ester of oleic acid or linoleic acid and a polyhydric alcohol having 4 or more carbon atoms is preferably 0.5 to 30% by mass, more preferably 1 to 20% by mass. . When the blending amount of the ester of oleic acid or linoleic acid and a polyhydric alcohol having 4 or more carbon atoms exceeds 30% by mass, the stability of the emulsion may be deteriorated. Any surfactant can be used as the surfactant to be added to the emulsion, and a nonionic surfactant is particularly preferable. Examples of nonionic surfactants include polyoxyethylene alkyl ether type nonionic surfactants, polyoxyethylene fatty acid ester type nonionic surfactants, polyoxyethylene fatty acid sorbitan ester type nonionic surfactants, Examples include polyoxyethylene hydrogenated castor oil type nonionic surfactants, polyoxyethylene glycerin fatty acid ester type nonionic surfactants, polyglycerin fatty acid ester type nonionic surfactants, and the like. Thus, the pollen scattering prevention agent made into the emulsion can prevent pollen scattering in a wide range by spraying a diluted liquid by adding a diluent such as water from, for example, a helicopter.

The pollen dispersion preventing agent of the present invention may be sprayed on, for example, cedar, at any time after the differentiation of male flower buds, and from 10 to 11 corresponding to the generation period of pollen grains from August when male flowers are grown. It can be sprayed over a relatively long period until the moon, which can effectively prevent pollen scattering in the next spring.

  Hereinafter, the present invention will be described in more detail with reference to examples. In the examples, “%” means mass basis.

Evaluation 1 (immersion test for cedar)
Esters comprising oleic acid or linoleic acid shown in Table 1 and a polyhydric alcohol having 4 or more carbon atoms were prepared. A large number of cedar needles of about 10 cm in length with 15 male flowers at the tip were collected from the same cedar tree, and each of these was taken as one group, and each group was immersed in 100 mL of the drug in Table 1. After being immersed for 1 minute, it was lifted from the solution and placed in a beaker, and changes in male flowers and needles were observed after one week. The test was conducted on cedars in August and November. The results for August are shown in Table 2, and the results for November are shown in Table 3, respectively. The sodium oleate and stearic acid or ester of palmitic acid and polyhydric alcohol used in the comparative examples are solid at room temperature, so that the aqueous solution of sodium oleate dissolved in water so that the active ingredient concentration is 5%. In addition, an ester of stearic acid or palmitic acid and a polyhydric alcohol was used as a liquid oil dissolved in squalane that does not affect male flowers and branches and leaves to an active ingredient concentration of 5%.

  From the results shown in Tables 2 and 3, in the examples according to the present invention, it was confirmed that the action on male flowers was sensitive without affecting the needles in both August and November. . On the other hand, Comparative Examples 1, 2 and 3 use oleic acid, sodium oleate and linoleic acid as chemicals, respectively, so that no effect is obtained on male flowers in November. In Comparative Examples 4 and 5, since an ester of stearic acid and palmitic acid and a polyhydric alcohol having 4 or more carbon atoms is used as a drug, no effect is obtained on male flowers in August and November. Has an adverse effect. In Comparative Examples 6 and 7, since an ester of linolenic acid and a polyhydric alcohol having 4 or more carbon atoms is used as a drug, an effect is obtained on male flowers in August and November. Has an adverse effect. In Comparative Examples 8 and 9, olive oil and sunflower oil are used as drugs, respectively, so that no effect is obtained on male flowers in November.

Evaluation 2 (Evaluation of emulsion type pollen scattering inhibitor)
Emulsions having the formulations shown in Table 4 were prepared, and the effects of each emulsion on cedar were evaluated in the same manner as in Evaluation 1. That is, a large number of cedar needles of about 10 cm in length with 15 male flowers at the tip were collected from the same cedar tree, each of which was taken as one group, and each group was immersed in 100 mL of the emulsion in Table 4. did. After being immersed for 1 minute, it was lifted from the solution and placed in a beaker, and changes in male flowers and needles were observed after one week. The test was conducted on cedars in August and November. The results are shown in Table 5. The emulsion was prepared as follows.
(Method for preparing emulsion)
After stirring and mixing the ester of oleic acid and polyhydric alcohol shown in Table 4 with polyoxyethylene (40 mol) hydrogenated castor oil as a surfactant, glycerin as an emulsion stabilizer, and water at 70 ° C., Using a homogenizer (QUICK HOMO MIXER LR-1 manufactured by Mizuho Kogyo Co., Ltd.), the mixture was treated at 7000 rpm for 3 minutes and then cooled with stirring to obtain an emulsion.
(Evaluation of emulsion stability)
Each emulsion was placed in a thermostatic bath where -5 ° C. and 40 ° C. were alternately repeated for 12 hours for 1 month, and the state of the emulsion was observed and evaluated as follows.
○: Stability is good (the appearance of the emulsion does not change for one month)
×: Stability failure (separation is observed in the emulsion in less than one month)

  From the results shown in Table 5, it was confirmed that the action on male flowers was sensitive without affecting needles in both August and November. In Formulation Example 6, since the blending amount of the ester of oleic acid and pentaerythritol exceeds 30% by mass, the stability of the emulsion is deteriorated.

Claims (2)

A pollen scattering inhibitor containing an ester of oleic acid or linoleic acid and a polyhydric alcohol having 4 or more carbon atoms. The pollen scattering inhibitor which is an emulsion containing 0.5 to 30% by mass of the pollen scattering inhibitor according to claim 1.