JP6706422B2 - Electromagnetic wave absorber, sunscreen, optical component, glasses, and method of manufacturing electromagnetic wave absorber - Google Patents

Description

The present invention relates to an electromagnetic wave absorber, a sunscreen agent, an optical component, glasses, and a method for manufacturing an electromagnetic wave absorber.

The sunlight contains ultraviolet rays (UV). The wavelength band of ultraviolet rays is generally 100 nm or more and 400 nm or less, although the definition is slightly different depending on the organization. Ultraviolet rays are classified into ultraviolet A waves (UV-A), ultraviolet B waves (UV-B), and ultraviolet C waves (UV-C) in consideration of the difference in biological effects due to the difference in wavelength. The ultraviolet A wave is also called an A region ultraviolet or a long wavelength ultraviolet and has a wavelength band of 315 nm or more and 400 nm or less. Ultraviolet B waves are also called B region ultraviolet rays or medium wavelength ultraviolet rays, and the wavelength band is 280 nm or more and less than 315 nm. The ultraviolet C wave is also called C region ultraviolet or short wavelength ultraviolet and has a wavelength band of 100 nm or more and less than 280 nm.

Ultraviolet A waves penetrate deep into the skin, into the dermis, causing wrinkles, sagging, and both red and black sunburns called sunburn. In addition, the ultraviolet A wave is absorbed by various molecules in the living body and oxidatively damages membrane lipids, proteins, and DNA through the resulting active oxygen, and is involved in skin aging. Ultraviolet B waves have a low penetration into the skin, but have a large effect on the skin surface, causing both spots, wrinkles, and sunburn and subsequent black sunburn. Furthermore, the ultraviolet B wave is absorbed by the DNA in the nucleus of the cell, damaging the DNA and causing skin cancer.

The shorter the wavelength of ultraviolet light, the greater the damage to biological materials, but the shorter the wavelength, the more likely it is to be absorbed by oxygen and the ozone layer. Ultraviolet C waves are absorbed by oxygen and the ozone layer and are hardly observed on the ground. Ultraviolet B waves are also absorbed by the oxygen and ozone layers, but some reach the ground. Most of the ultraviolet A waves reach the ground. The ultraviolet A wave has a longer wavelength than the ultraviolet B wave, but occupies most of the ultraviolet light reaching the ground. Therefore, the damage to the biological material due to the ultraviolet A wave cannot be ignored. For example, the contribution ratio to sunburn is said to be 70% to 80% for ultraviolet B waves and 20% to 30% for ultraviolet A waves.

Some conventional sunscreens include organic compounds such as oxybenzone and avobenzone that absorb ultraviolet A waves. However, these organic compounds are not naturally derived components, and are considered to have a risk of causing inflammation and rough skin. On the other hand, Patent Document 1 describes an ultraviolet absorber which contains the genus Methylobacterium and has an absorption peak of an ultraviolet absorption spectrum in a wavelength band of 320 nm to 400 nm. In addition, Patent Document 2 removes cells from a fermented liquid obtained by co-fermenting rice, papaya, seaweed, yeast, and casei, plantarum, and lactis species of the genus Lactobacillus (Lactobacillus). The melanoidins obtained are described.

Japanese Patent No. 5751517 JP, 2013-133423, A

There is a need for a naturally occurring UV absorber that is not limited to the genus Methylobacterium. The present invention has been made in view of such circumstances, and an object thereof is to provide an electromagnetic wave absorber that absorbs ultraviolet rays by a naturally derived component, a sunscreen agent, an optical component, glasses, and a method for manufacturing the electromagnetic wave absorber. And

The electromagnetic wave absorber according to one aspect of the present invention includes a genus Lactobacillus that absorbs at least ultraviolet rays. A sunscreen agent according to one aspect of the present invention includes the electromagnetic wave absorber described above. Further, an optical component according to one aspect of the present invention includes a transparent member and the above electromagnetic wave absorber disposed on the transparent member. Further, eyeglasses according to one aspect of the present invention include the above-mentioned optical component as a lens. Furthermore, the method for producing an electromagnetic wave absorber according to one aspect of the present invention comprises fermenting a plant to obtain a fermentation liquid containing Lactobacillus that absorbs at least ultraviolet rays.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the electromagnetic wave absorber which absorbs ultraviolet rays by a naturally derived component, a sunscreen, an optical component, glasses, and the manufacturing method of an electromagnetic wave absorber.

3 is a graph and a table showing analysis results of bacteria contained in the fermentation liquor according to Example 1. 3 is a graph showing an ultraviolet absorption spectrum of the fermentation liquid according to Example 1. 9 is a graph and a table showing analysis results of bacteria contained in the fermentation liquor according to Example 2. 5 is a graph showing an ultraviolet absorption spectrum of the fermentation liquid according to Example 2. 3 is a graph showing an ultraviolet absorption spectrum of a commercially available sunscreen cream A according to Example 3. 7 is a graph showing an ultraviolet absorption spectrum of a commercially available sunscreen cream B according to Example 3. 5 is a graph showing an ultraviolet absorption spectrum of a Lactobacillus suspension according to Example 3. 9 is a table and a graph showing the absorbance of a Lactobacillus suspension according to Example 4.

Hereinafter, embodiments of the present invention will be described in detail. The following embodiments are examples of devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention specifies combinations of constituent members and the like as follows. Not something to do. The technical idea of the present invention can be modified in various ways within the scope of the claims.

(First embodiment)
The electromagnetic wave absorber according to the first embodiment of the present invention absorbs at least ultraviolet rays and contains the genus Lactobacillus. Lactobacillus is a kind of lactobacillus and is a Gram-positive facultative anaerobic bacterium. Lactobacillus ferments sugar to produce lactic acid. The genus Lactobacillus also inhabits the body of animals including humans, but the genus Lactobacillus according to the first embodiment is preferably a genus Lactobacillus derived from a plant.

For example, the Lactobacillus genus according to the first embodiment is extracted by fermenting a plant. Plants include, but are not limited to, mugwort, tomorrow leaves, life-prolonging grass, and cocoa. The genus Lactobacillus derived from mugwort includes, for example, parafararrinis species, parabuchneri species, buchneri species, and harbinensis species. The genus Lactobacillus derived from tomorrow leaves includes, for example, vini species and nagelii species. The electromagnetic wave absorber according to the first embodiment may include a plurality of Lactobacillus species.

Lactobacillus absorbs at least part of the wavelength band of ultraviolet and visible light. For example, the wavelength band of ultraviolet rays absorbed by Lactobacillus is 200 nm or more and 400 nm or less. The wavelength band of the ultraviolet A wave absorbed by Lactobacillus is 315 nm or more and 400 nm or less. The wavelength band of the ultraviolet B wave absorbed by Lactobacillus is 280 nm to 315 nm. The wavelength band of the ultraviolet C wave absorbed by Lactobacillus is 200 nm or more and 280 nm. The wavelength band of visible light absorbed by Lactobacillus is 400 nm or more, 800 nm or less, 700 nm or less, 600 nm or less, or 500 nm or less, and includes blue light.

For example, the genus Lactobacillus derived from mugwort absorbs ultraviolet A waves of 340 nm to 500 nm and visible light. Further, the genus Lactobacillus derived from tomorrow leaves absorbs ultraviolet A wave, ultraviolet B wave, ultraviolet C wave, and visible light of 230 nm or more and 500 nm or less.

The peak in the absorption spectrum of the genus Lactobacillus is within the ultraviolet wavelength band. The full width at half maximum of the absorption spectrum by Lactobacillus is 20 nm or more within the wavelength band of ultraviolet rays. For example, the half-width of the absorption spectrum of the genus Lactobacillus derived from mugwort is 20 nm or more, 30 nm or more, or 40 nm or more in the wavelength band of ultraviolet rays. In addition, the half-width of the absorption spectrum by the genus Lactobacillus derived from tomorrow leaves is 20 nm or more, 30 nm or more, 40 nm or more, 60 nm or more, 80 nm or more, 100 nm or more, 120 nm or more, 140 nm or more, or 160 nm or more in the ultraviolet wavelength band. is there.

The full width at half maximum of the absorption spectrum by Lactobacillus is 20 nm or more in the wavelength band of the ultraviolet A wave. For example, the half width of the absorption spectrum of the genus Lactobacillus derived from mugwort is 20 nm or more, 30 nm or more, or 40 nm or more in the wavelength band of the ultraviolet A wave. Further, the half-value width of the absorption spectrum of the genus Lactobacillus derived from tomorrow leaves is 20 nm or more, 30 nm or more, 40 nm or more, or 60 nm or more in the wavelength band of the ultraviolet A wave.

The full width at half maximum of the absorption spectrum of Lactobacillus is 100 nm or more, 150 nm or more, or 200 nm or more in the wavelength band of visible light and ultraviolet A wave. The slope of the peak in the absorption spectrum of Lactobacillus tends to be steep on the short wavelength side and gentle on the long wavelength side. Therefore, the ultraviolet absorption effect is exerted over a wide wavelength band from the peak of the absorption spectrum toward the long wavelength side of the ultraviolet A wave.

The genus Lactobacillus derived from mugwort tends to absorb more of the short wavelength band on the ultraviolet side than the long wavelength band in the visible light wavelength band, absorbs violet light and blue light, and transmits red light and green light. There is a tendency. Therefore, when the genus Lactobacillus derived from mugwort is used, the transmitted light of the electromagnetic wave absorbent according to the first embodiment tends to appear yellow to brown.

The electromagnetic wave absorber according to the first embodiment contains Lactobacillus at a concentration of, for example, 0.001% by weight or more, 0.005% by weight or more, or 0.01% by weight or more. By containing Lactobacillus at a concentration of 0.001% by weight or more, the ultraviolet absorbing effect tends to be exhibited. The electromagnetic wave absorber according to the first embodiment contains Lactobacillus at a concentration of, for example, 20% by weight or less, 15% by weight or less, or 10% by weight or less, but may contain Lactobacillus at a higher concentration. .. However, when the concentration of Lactobacillus is high, the viscosity tends to increase. The Lactobacillus genus content of the electromagnetic wave absorber according to the first embodiment is appropriately determined according to the target ultraviolet ray absorption amount. It should be noted that conventional mugwort cream, tomorrow leaf cream and the like have microbial cells removed or substantially no microbial cells.

In the genus Lactobacillus, for example, heat-killed dead bacteria tend to absorb more ultraviolet rays than live bacteria. Therefore, the electromagnetic wave absorber according to the first embodiment may contain dead bacteria of the genus Lactobacillus. The Lactobacillus genus may be a dried microbial cell product. By using Lactobacillus genus as a dried product of cells, it becomes possible to store it stably for a long period of time.

Long wavelengths of ultraviolet rays tend to penetrate the skin more easily. Further, also in the ultraviolet A wave band, longer wavelengths tend to penetrate the skin more easily. On the other hand, the Lactobacillus genus according to the first embodiment has a wide half-value width of the absorption spectrum, and also exhibits an ultraviolet absorption effect over a wide wavelength band from the peak of the absorption spectrum toward the long wavelength side, and Has the effect of suppressing the permeation of skin into the skin. Therefore, the electromagnetic wave absorber according to the first embodiment can be used as a sunscreen agent (sunscreen agent) that is externally applied to the skin or hair and suppresses inflammation due to sunburn. Further, by using the plant-derived Lactobacillus genus, the electromagnetic wave absorber according to the first embodiment has less burden on the skin.

The electromagnetic wave absorber according to the first embodiment may be blended in skin care cosmetics such as lotion, emulsion, cream, spray, and beauty essence. Further, the electromagnetic wave absorber according to the first embodiment may be blended with makeup for bases, foundations, lipsticks, face colors, and makeup cosmetics such as eyeliners.

The electromagnetic wave absorber according to the first embodiment is a dye, liquid oil, solid oil, wax, hydrocarbon, higher fatty acid, higher alcohol, ester, silicone, anionic surfactant, cationic surfactant other than Lactobacillus. Agents, amphoteric surfactants, nonionic surfactants, humectants, water-soluble polymers, thickeners, coating agents, sequestering agents, lower alcohols, polyhydric alcohols, sugars, amino acids, organic amines, A pH adjusting agent, a skin nutrition agent, vitamins, an antioxidant, a fragrance, a powder, a coloring material, and a blending component of cosmetics and pharmaceuticals such as water may be appropriately contained depending on the purpose.

In addition to the Lactobacillus genus, the electromagnetic wave absorber according to the first embodiment may appropriately include an organic compound-based ultraviolet absorber, an inorganic compound-based ultraviolet scatterer, and the like, depending on the purpose. For example, the ultraviolet absorber that does not absorb the ultraviolet A wave and the electromagnetic absorber that absorbs the ultraviolet A wave according to the first embodiment may be used together.

The electromagnetic wave absorber according to the first embodiment is produced by fermenting a plant to obtain a fermentation liquid containing Lactobacillus. When fermenting a plant, salt and sugar such as molasses are added to the plant. The fermentation temperature is, for example, 30°C. The hydrogen ion index (pH) of the obtained fermentation liquor is around 4.0. The obtained fermentation broth may be heated to kill the Lactobacillus genus contained in the fermentation broth. Alternatively, the fermentation broth may be spray-dried to obtain a dried product of Lactobacillus cells.

(Second embodiment)
In the second and subsequent embodiments, description of matters common to the first embodiment will be omitted, and only different points will be described. In particular, similar effects obtained by the same configuration will not be sequentially described for each embodiment.

The electromagnetic wave absorber containing Lactobacillus may be blended as a UV resistant material in products other than the skin external preparation, for example, paints, dyes, pigments, various resins, synthetic rubbers, latexes, films, fibers and the like.

For example, the optical component according to the second embodiment includes a transparent member and a coating layer coated on the transparent member and containing the electromagnetic wave absorber described in the first embodiment. The transparent member is made of a transparent material such as glass and resin. The optical component according to the second embodiment can be used, for example, as a lens for eyeglasses or as a translucent plate for televisions and computer displays.

As described in the first embodiment, the electromagnetic wave absorber containing the Lactobacillus genus absorbs blue light. Therefore, the optical component according to the embodiment can prevent not only ultraviolet light but also blue light from entering the eyes. Suppress. Therefore, it has the effect of suppressing eye fatigue. Further, the electromagnetic wave absorber according to the embodiment does not reflect blue light but absorbs it, so that blue color does not occur in the lenses of the glasses.

Embodiments of the present invention will be described below. However, it goes without saying that the present invention is not limited to the following examples.

(Example 1: Lactobacillus genus derived from mugwort)
It is said that the number of lactic acid bacteria in the leaves of mugwort is maximized within a total of 2 hours, one hour before and after the sunrise time. In addition, it is said that lactic acid bacteria decrease and photosynthetic bacteria increase outside of this time period. Therefore, a portion of about 20 cm from the tip of the wormwood leaf was collected during these two hours. Immediately put the collected 6.3 kg mugwort leaves into the first pickle barrel with a plastic bag inside, sprinkle 3.2 kg molasses and 0.6 kg crude salt on the mugwort leaves, The mouth of the plastic bag was closed and sealed. We placed heavy stones on top of the plastic bag and pickled mugwort leaves.

A few days after the pickled juice went up onto the leaves of the mugwort, the weights were removed. Next, 10 L of chlorine-free water for rinse-out was put into the second pickled barrel, and the pickled leaves of mugwort and 10 kg of pickled juice were put in the water. Further, a third pickle barrel was prepared, and a wire netting filter was placed on the opening of the third pickle barrel. The mugwort leaves were taken out little by little from the second pickle barrel while hand-washing, the mugwort leaves were lightly pressed against the wire mesh filter on the opening of the third pickle barrel, and the pickled juice was squeezed.

After squeezing all the leaves of mugwort, the pickled juice remaining in the second pickled juice was filtered through a wire mesh filter. Next, molasses (Hateruma brown sugar) was dissolved in the soup stock in the third pickle barrel to a final concentration of 10% by weight, and crude salt was dissolved to a final concentration of 3% by weight. Then, the fermentation was started by setting the ambient temperature of the third pickled barrel to about 30°C. Large foam formation was confirmed at first, then gradually changed to fine foam formation, and finally foam formation subsided. Approximately one week after the start of fermentation, the pH when the foaming stopped was around 3.8. The pickled juice at this time was used as a mugwort fermentation liquid. A part of the obtained mugwort fermentation liquid was heated at 70° C. for 30 minutes to obtain a heat-treated mugwort fermentation liquid in which the bacteria were killed. Furthermore, the heat-treated mugwort fermented liquor was filtered with a filter having an opening of 0.8 μm to obtain a sterilized liquid from which bacteria were removed.

When the mugwort fermentation liquid which was not heat-treated was analyzed by a next-generation sequencer (MiSeq, Illumina), as shown in FIG. Was included. The next generation sequencer is also called a high throughput sequencer. In addition, the numerical values in the table of FIG. 1 reflect the number of bacterial species contained in the mugwort fermentation liquid.

In addition, when the UV absorption spectra of the mugwort fermentation liquid, the heat-treated mugwort fermentation liquid, and the sterilized liquid were analyzed by a spectroscope (UV-2600, Shimadzu Corporation), as shown in FIG. 2, the mugwort fermentation liquid and heat-treated mugwort were used. The fermentation liquid absorbed ultraviolet A waves and visible light, specifically, electromagnetic waves having a wavelength of 350 nm or more. Further, the heat-treated mugwort fermented liquid absorbed more ultraviolet rays and visible light than the mugwort fermented liquid. On the other hand, the sterilized liquid hardly absorbed ultraviolet rays and visible rays. From these results, it was shown that the genus Lactobacillus derived from mugwort leaves absorbs ultraviolet rays and visible rays.

(Example 2: Lactobacillus genus derived from tomorrow leaves)
In tomorrow, the number of lactic acid bacteria is said to be maximized within a total of 2 hours, 1 hour before and after the sunrise time, in a day. In addition, it is said that lactic acid bacteria decrease and photosynthetic bacteria increase outside of this time period. Therefore, during the last 2 hours, the shoot stems of tomorrow leaves were collected. Immediately put the collected 6.3 kg of tomorrow leaves into the first pickled barrel with a plastic bag inside, sprinkle 3.2 kg of molasses and 0.6 kg of crude salt on the tomorrow leaves, and then put them in a plastic bag. The mouth was closed and sealed. I put the weight on the top of the plastic bag and pickled the leaves tomorrow.

A few days after the pickled soup rose to the top of the leaves tomorrow, the weight was removed. Next, 10 L of chlorine-free water for rinse-out was put into the second pickle barrel, and tomorrow leaf pickles and 10 kg of pickle juice were put in the water. Further, a third pickle barrel was prepared, and a wire netting filter was placed on the opening of the third pickle barrel. Tomorrow leaves were taken out little by little from the second pickle barrel while hand-washing, and the tomorrow leaf was lightly pressed against the wire mesh filter on the opening of the third pickle barrel with the palm to squeeze the pickled juice.

After squeezing all the leaves tomorrow, the pickled juice remaining in the second pickled juice was filtered through a wire mesh filter. Next, molasses was dissolved in the soup stock in the third pickle barrel to a final concentration of 10% by weight, and crude salt was dissolved in the final concentration of 3% by weight. Then, the fermentation was started by setting the ambient temperature of the third pickled barrel to about 30°C. Large foam formation was confirmed at first, then gradually changed to fine foam formation, and finally foam formation subsided. The pH when foaming stopped was around 4.0. The pickled juice at this time was used as a fermented liquid for tomorrow. A part of the obtained tomorrow leaf fermentation broth was heated at 70° C. for 30 minutes to obtain a heat-treated tomorrow leaf fermentation broth to kill the bacteria. Further, the heat-treated tomorrow leaf fermentation broth was filtered with a filter having an opening of 0.8 μm to obtain a sterilized solution from which bacteria were removed.

When the heat-treated tomorrow leaf fermentation liquid was analyzed by a next-generation sequencer (MiSeq, Illumina), the tomorrow leaf fermentation liquid contained vini species, nagelii species and the like as shown in FIG. The numerical values in the table of FIG. 3 reflect the number of bacterial species contained in the tomorrow leaf fermentation broth.

Further, when the UV absorption spectra of the tomorrow leaf fermentation broth, the heat-treated tomorrow leaf fermentation broth, and the sterilization solution were analyzed by a spectroscope (UV-2600, Shimadzu Corporation), as shown in FIG. The heat-treated tomorrow fermented liquor absorbed ultraviolet A waves, ultraviolet B waves, ultraviolet C waves, and visible light, specifically, electromagnetic waves having a wavelength of 220 nm or more. Further, the heat-treated tomorrow leaf fermentation liquid absorbed more ultraviolet rays and visible light than the tomorrow leaf fermentation liquid. On the other hand, the sterilized liquid hardly absorbed ultraviolet rays and visible rays. From these results, it was shown that the genus Lactobacillus derived from tomorrow absorbs ultraviolet rays and visible rays.

(Example 3: Lactobacillus suspension)
The heat-treated mugwort fermentation liquid prepared in Example 1 was spray-dried to obtain a dried Lactobacillus bacterium. The obtained dried microbial cell product was suspended in water and glycerin so that the dried microbial cell content was 10 parts by weight to obtain a suspension of Lactobacillus according to Example 3. The ultraviolet absorption spectra of the commercially available sunscreen creams A and B and the suspension of the genus Lactobacillus according to Example 3 were analyzed by a spectroscope (UV-2600, Shimadzu Corporation).

As a result, as shown in FIGS. 5 and 6, although the commercially available sunscreen creams A and B absorb the ultraviolet A wave, the absorbance was low in the wavelength band of 350 nm or more. On the other hand, as shown in FIG. 7, the Lactobacillus suspension according to Example 3 had a high absorbance in the wavelength band of 350 nm or more. Even in the ultraviolet A wave band, the longer the wavelength, the more the UV penetrates the skin, but it was shown that Lactobacillus significantly absorbs UV having such a long wavelength as compared with the commercially available sunscreen cream. ..

(Example 4: Lactobacillus concentration)
A suspension containing the dried Lactobacillus cells obtained in the same manner as in Example 3 at various concentrations shown in FIG. 8 was prepared, and the absorbance of ultraviolet rays at a wavelength of 365 nm was measured by a spectrometer (UV-2600, Shimadzu Corporation). Analyzed in. As a result, the suspension containing 0.001% by weight or more of Lactobacillus showed a practical absorbance. When the concentration of Lactobacillus exceeds 20% by weight, no change in absorbance was observed.

The embodiments and examples described above are for facilitating the understanding of the present invention and are not for limiting the interpretation of the present invention. The present invention can be modified/improved without departing from the spirit thereof, and the present invention also includes equivalents thereof. That is, those obtained by appropriately modifying the design of each embodiment and example by those skilled in the art are also included in the scope of the present invention as long as they have the features of the present invention. For example, the elements and the like included in each of the embodiments and examples are not limited to those illustrated, but can be appropriately changed. Further, it is needless to say that the respective embodiments and examples are exemplifications, and partial replacement or combination of the configurations shown in the different embodiments is possible, and these are also within the scope of the present invention as long as they include the features of the present invention. Included.

Claims (37)

Absorbs at least ultraviolet, a electromagnetic wave absorber comprising a bacterium belonging to Lactobacillus (Lactobacillus) genus,
The species of a bacterium belonging to the genus Lactobacillus is at least one selected from the group consisting of parafarraginis species, parabuchneri species, buchneri species, harbinensis species, vini species, and nagelii species,
Electromagnetic wave absorber . The electromagnetic wave absorber according to claim 1, wherein the species of the bacterium belonging to the genus Lactobacillus includes parafararginis species, parabuchneri species, buchneri species, and harbinensis species. The electromagnetic wave absorber according to claim 2, wherein the bacterium belonging to the genus Lactobacillus is derived from mugwort. The electromagnetic wave absorber according to claim 1, wherein the species of the bacterium belonging to the genus Lactobacillus includes a species of vini and a species of nagelii. The electromagnetic wave absorbent according to claim 4, wherein the bacterium belonging to the genus Lactobacillus is derived from tomorrow leaves. The electromagnetic wave absorbent according to any one of claims 1 to 5 , which absorbs at least a part of wavelength bands of ultraviolet rays and visible rays. The electromagnetic wave absorbent according to any one of claims 1 to 6 , which absorbs at least a part of a wavelength band of 200 nm or more and 800 nm or less. The electromagnetic wave absorbent according to any one of claims 1 to 7 , which absorbs at least a part of a wavelength band of ultraviolet A waves. The electromagnetic wave absorbent according to any one of claims 1 to 8 , wherein a peak in an absorption spectrum is within a wavelength band of ultraviolet rays. The electromagnetic wave absorbent according to claim 9 , wherein the slope of the peak is steep on the short wavelength side and is gentle on the long wavelength side. The electromagnetic wave absorbent according to claim 9 or 10 , wherein the absorption spectrum has a half width of 20 nm or more in the wavelength band of the ultraviolet A wave. The electromagnetic wave absorbent according to any one of claims 9 to 11 , wherein a half width of the absorption spectrum is 100 nm or more within a wavelength band of visible light and ultraviolet A waves. The electromagnetic wave absorbent according to any one of claims 1 to 12, wherein the bacterium belonging to the genus Lactobacillus is a dead bacterium. The electromagnetic wave absorbent according to any one of claims 1 to 13, wherein the bacterium belonging to the genus Lactobacillus is heat-treated. The electromagnetic wave absorbent according to any one of claims 1 to 14, wherein the bacterium belonging to the genus Lactobacillus is a dried microbial cell. The electromagnetic wave absorbent according to any one of claims 1 to 15, which contains a bacterium belonging to the genus Lactobacillus at a concentration of 0.001% by weight or more. A sunscreen agent comprising the electromagnetic wave absorbent according to claim 1. A transparent member,
The electromagnetic wave absorber according to any one of claims 1 to 16, which is disposed on the transparent member,
An optical component including. The optical component according to claim 18, which absorbs blue light. Glasses comprising the optical component according to claim 18 or 19 as a lens. A method for producing an electromagnetic wave absorber, comprising fermenting a plant to obtain a fermentation solution comprising a bacterium belonging to the genus Lactobacillus, which absorbs at least ultraviolet rays ,
The species of a bacterium belonging to the genus Lactobacillus is at least one selected from the group consisting of parafarraginis species, parabuchneri species, buchneri species, harbinensis species, vini species, and nagelii species,
Method for producing electromagnetic wave absorber . The method for producing an electromagnetic wave absorber according to claim 21, wherein the plant is fermented with a bacterium belonging to the genus Lactobacillus derived from the plant. The method for producing an electromagnetic wave absorber according to claim 21 or 22, wherein the species of a bacterium belonging to the genus Lactobacillus includes a parafarraginis species, a parabuchneri species, a buchneri species, and a harbinensis species. The method for producing an electromagnetic wave absorber according to claim 23 , wherein the plant is mugwort. The method for producing an electromagnetic wave absorber according to claim 21 or 22, wherein the species of the bacterium belonging to the genus Lactobacillus includes a species of vini and a species of nagelii. The method for producing an electromagnetic wave absorber according to claim 25, wherein the plant is tomorrow leaf. Further comprising, a manufacturing method of the electromagnetic wave absorber according to any one of claims 21 26 to the bacteria belonging to the genus Lactobacillus contained in the fermentation solution killed. The method for producing an electromagnetic wave absorber according to any one of claims 21 to 27 , further comprising heating the fermentation liquid. The method for producing an electromagnetic wave absorber according to any one of claims 21 to 28 , further comprising drying the fermentation liquid to obtain a dried microbial cell product. 30. The method for producing an electromagnetic wave absorber according to claim 21, wherein the electromagnetic wave absorber absorbs at least a part of a wavelength band of ultraviolet rays and visible rays. 31. The method for producing an electromagnetic wave absorbent according to claim 21, wherein the electromagnetic wave absorbent absorbs at least a part of a wavelength band of 200 nm or more and 800 nm or less. The method for producing an electromagnetic wave absorbent according to any one of claims 21 to 31, wherein the electromagnetic wave absorbent absorbs at least a part of a wavelength band of ultraviolet A waves. 33. The method for producing an electromagnetic wave absorbent according to any one of claims 21 to 32, wherein a peak in an absorption spectrum of the electromagnetic wave absorbent is within an ultraviolet wavelength band. 34. The method for producing an electromagnetic wave absorber according to claim 33, wherein the slope of the peak is steep on the short wavelength side and is gentle on the long wavelength side. The method for producing an electromagnetic wave absorber according to claim 33 or 34, wherein the half width of the absorption spectrum is 20 nm or more in the wavelength band of the ultraviolet A wave. The method for producing an electromagnetic wave absorbent according to any one of claims 33 to 35, wherein a half width of the absorption spectrum is 100 nm or more within a wavelength band of visible light and ultraviolet A waves. The method for producing an electromagnetic wave absorbent according to any one of claims 21 to 36, wherein the fermentation liquid contains a bacterium belonging to the genus Lactobacillus in a concentration of 0.001% by weight or more.