KR100600994B1 - Pharmaceutical compositions containing butterber-extract for enhance of brain function - Google Patents

Abstract

The present invention relates to a butterbur extract, which is a novel drug material for improving brain function, which has a protective function of brain function and augmentation activity of memory through blood brain barrier.

The present invention also relates to a pharmaceutical composition for improving brain function containing the coltsfoot extract as an active ingredient.

Butterbur extract of the present invention can be expected to protect the brain function and enhance memory effect to a wide range of adolescents, adults and the elderly.

Butterbur Extract, Improves Memory, Brain Function

Description

Pharmaceutical composition for improving brain function containing coltsfoot extract {PHARMACEUTICAL COMPOSITIONS CONTAINING BUTTERBER-EXTRACT FOR ENHANCE OF BRAIN FUNCTION}             

1 is a graph comparing the degree of induction of LTP (Long Term Potentiation) of a control animal and a control group administered with crude coltsfoot extract negatively,

2 is a graph comparing the degree of LTP induction for the result of administering crude butterbur extract as a feed,

Figure 3 is a photograph showing the effect of the administration of butterbur crude extract on the expression of Brain Derived Neurotropic Factor (BDNF) in the brain cortex,

Figure 4 is a photograph showing the effect of crude butterbur extract administration on the expression of cREB (cAMP Responsive Element Binding Protein) in the brain hippocampus,

5 is a graph showing the results of learning with Morris Sumi for normal rats treated with colostrum crude extract negatively,

6 is a graph showing the learning results of Morris Sumi for normal old rats treated with crude coltsfoot extract;

7 is a graph showing the effect of butterbur extract on working memory in normal aged rats,

8 is a swimming trajectory photograph of the old rats administered the crude coltsfoot extract,

9 is a graph showing the learning results of Morris Sumi for normal rats administered crude butterbur extract by dose,

10 is a graph showing the learning results of Morris Sumi for normal rats administered with butterbur extract in a negative dose,

FIG. 11 is a graph illustrating passive avoidance of sand rats treated with butterbur extract as a negative dose.

The present invention relates to a pharmaceutical composition for improving brain function, which contains a butterbur extract as an active ingredient, which is a new drug material for improving brain function having a protective function of brain function and memory activity through blood brain barrier.

As society changes rapidly and diversified in the flood of information, modern people living in these times are living under a lot of stress. Stress promotes aging of the brain's hippocampus, which is related to memory, leading to memory loss. Cognitive function is a central process that has a decisive influence on the activities of daily living. Concentration, short term memory, working memory, long term memory, reasoning, motor control and work It includes mental processes, such as planning, and the efficiency of making these processes clearly run is directly related to our intellectual ability, and ultimately has a significant impact on the quality of life.

To date, there have been studies of drugs aimed at improving brain function, which are believed to increase the metabolic rate of the central nervous system. These are usually derivatives of gamma aminobutyric acid. Drugs are known to act on the choline system to promote the synthesis and release of neurotransmitter called acetylcholine. To date, drugs developed to date include acetylcholine precursor, receptor agonist, nicotine, etc. Drugs such as Tacrine and Aricept (donepezil), which are also used in Korea with the approval of the FDA, also have the effect of improving the deteriorated cognitive function by preventing the degradation of neurotransmitters called acetylcholine. Are known to be temporary, limited and serious, yet these preparations The effect requires further study.

In addition, vitamin C or E, beta-carotene, seniline (seniline), ginkgo leaf extract (Egb 761), etc. are thought to have an effect on the brain dysfunction through the antioxidant function, but the systematic research is still insufficient More investigation is needed.

In order to improve brain function, researches on functional materials using metabolic accelerators or antioxidants of the central nervous system have been conducted, and researches to find effective materials with low side effects from natural materials have been actively conducted. Is not developed.

In addition, cognitive enhancers and anti-amyloid agents have been developed, but the drug development for these drugs must pass through the Blood Brain Barrier of the neurological disorders to be effective. One of the difficulties of development is that research on the current level is very low.

Currently, the only alternative to bypassing the problem of blood brain barrier is empirical validation through in vivo experiments. In this regard, natural products related to the brain nervous system, which have been empirically tested for thousands of years, are expected to develop natural medicines to treat brain function related diseases such as dementia or forgetfulness.

Butterbur is a plant belonging to the chrysanthemum family (Sukgeuncho) and is known as Bongdu-geun, Sadocho, and Yamangok, which grows in moist fields, paddy fields, fields, and foothills, and uses young leaves and young flowers for food. It is good for bronchial asthma, dry stomach, fever, boil and snake and insect bite wounds and burns. Butterbur buds are effective for dry stomach, cough, fever, and high blood pressure. They can also be used to enhance appetite. Although it is made and eaten, research on the biological activity of butterbur is very poor, and there is no research on the effect of improving brain function.

In this regard, the present inventors have been studying to find a drug material that can solve the problem of blood brain barrier and improve brain function by in vivo experiments in natural products with little side effects. Long-term potentiation (LTP), an electrophysiological parameter of memory, is significantly increased, and the brain derived neurotropic factor (BDNF) and CREB (cAMP) are closely related to the signaling mechanisms of memory learning. Responsive Element Binding Protein) was increased to confirm that the memory enhancement effect appeared to complete the present invention.

It is an object of the present invention to provide a butterbur extract as a drug material that can pass through the blood brain barrier in natural products to solve the problem of the blood brain barrier and improve brain function.

In addition, an object of the present invention is to provide a pharmaceutical composition for improving brain function containing the extract extracted from the natural material.

In order to achieve the above object, the present invention provides a butterbur extract having a protective effect on the brain function and enhancing the memory through the blood brain barrier.

In another aspect, the present invention provides a pharmaceutical composition for improving brain function containing the butterbur extract as an active ingredient.

Referring to the present invention in more detail as follows.

The present invention is a coltsfoot extract having a protective function of the brain function and memory enhancer through the blood brain barrier, the coltsfoot used in the present invention includes both Korean colts (Petasites japonicus) and Western colts (Petasites officinalis).

In the present invention, the butterbur extract having a protective function of brain function and memory enhancing activity through the blood brain barrier, as well as crude extract of butterbur extracted by adding water or alcohol to the coltsfoot, as well as ethyl acetate added to the extract to remove the ethyl acetate fraction And it means that it contains the butterbur fraction extract separated in the water layer.

The crude butterbur extract is prepared by extracting hot water by adding water to the butterbur or extracting it by cold or low temperature heating by adding alcohol, and dried under reduced pressure to prepare a powder form. Preferably, the alcohol added to extract the crude butterbur extract may be selected from 5 to 100% ethanol or methanol, and more preferably 70% ethanol.

In addition, the present invention is extracted by adding water or alcohol aqueous solution to the butterbur, and then added ethyl acetate to the extract to remove the ethyl acetate fraction and to separate the water (Water) layer to prepare a butterbur extract from the extract obtained in the aqueous layer .

The butterbur fraction extract was developed in a column thin layer chromatograph identification test at a ratio of butanol: methanol: ammonium hydroxide: water = 3: 2: 1: 2, and then exposed to UV at 254 nm, at an R _f value of 0.5 to 0.8. Absorption occurs in dark brown, and when soaked in 10% sulfuric acid and heated to 100 ° C, it shows dark brown spots at R _f value of 0.6, brown spots at R _f value of 0.5 to 0.8 when iodine color is developed. Negative reaction in color reaction of rope color reagent.

In addition, the butterbur fraction extract according to the present invention has a pH of 5.0 to 8.0 in an aqueous solution, insoluble in hexane, ethyl acetate, ethanol, acetone, ether, benzene, slightly dissolved in methanol (0.1%), and dissolved in distilled water.

The present invention provides a pharmaceutical composition for improving brain function containing the coltsfoot extract as an active ingredient.

The action of drugs associated with brain dysfunction is associated with long term term changes (LTP), increased brain derived neurotropic factor (BDNF) expression and local activation of TrkB receptors in local areas such as the hippocampus and the inferior temporal cortex. Related to this, deprivation of BDNF leads to impairment of learning and memory, so BDNF is essential for memory learning. In addition, CAMP Responsive Element Binding Protein (CREB) is known to be a regulator of various memory formation, such as space and social learning, in addition to protecting brain damage.

As a result of examining the effect on the brain function after administering the crude coltsfoot extract of the present invention to rats and learning with Morris Sumi, it significantly increased the long-term potentiation (LTP) of electrophysiological parameters of memory ( 1 and 2), the expression of Brain Derived Neurotropic Factor (BDNF) and CAMP Responsive Element Binding Protein (CREB), which are closely related to the signaling mechanism of memory learning, was increased (FIGS. 3 and 4).

Administration of the crude coltsfoot extract and coltsfoot extract of the present invention to the rats to investigate the effect on brain function showed a memory enhancement effect (Fig. 5). In particular, since the memory effect of the butterbur fraction extract is superior to the crude butterbur extract, it can be seen that the memory-enhancing active ingredient is concentrated in the butterbur fraction extract (FIGS. 9 to 11). In addition, administration of the crude butterbur extract to the elderly rats were learned to Morris Sumi showed a memory enhancement effect (Figs. 6 to 8).

Therefore, the butterbur extract of the present invention is a new drug material that has a protective function of brain function and enhances memory function through the blood brain barrier, and can be usefully used for improving brain function to a wide range of adolescents, adults, and the elderly. It can be developed as a medicine for the prevention and treatment of (forgetfulness, dementia, Alzheimer's disease, etc.).

The present invention contains the butterbur extract as an active ingredient, and can be mixed with a diluent or excipient such as commonly used fillers, extenders, binders, wetting agents, disintegrants and surfactants to prepare a pharmaceutical composition for improving brain function. Oral formulations such as tablets, capsules, powders, granules, suspensions, emulsifiers, syrups, liquids, etc. may be used by conventional methods, or may be dissolved in distilled water for injection by conventional methods and used as injections.

The present invention can be parenterally or orally administered as desired, the effective amount of butterbur extract effective in the pharmaceutical composition for improving brain function is the amount of 0.8g to 3.2g per day for adults (60kg body weight) 1 It can be administered dividedly several times to several times, and preferably, 1.6g to 3.2g amount is administered per day.

In addition, the butterbur extract of the present invention was found to be a safe substance as a result of acute toxicity and subacute toxicity test.

Hereinafter, the present invention will be described in detail by examples.

The following examples are intended to illustrate the invention and are not intended to limit the scope of the invention.

Example 1 Preparation of Butterbur Extract

1.8 tons of undried butterburs were washed cleanly and cut into 10cm lengths to obtain 98kg of butterburs dried. 70% 370L of ethanol was added and the mixture was extracted by mixing for 8 hours at a temperature between 55 ℃ and 60 ℃. Amount of ethanol was added and reextracted. The extract was concentrated under a reduced pressure concentrator to obtain 42 kg of crude butterbur extract (yield 42%) having a water content of about 31% (67-68 ° Brix).

Example 2 Preparation of Butterbur Extract

4 kg of the crude butterbur extract prepared in Example 1 was suspended in 20 L of distilled water, shaken twice with 18 L of ethyl acetate, and then the ethyl acetate soluble fraction (36 L) was removed, and the separated aqueous layer was concentrated under reduced pressure at 50 ° C. (pH: 6.7) 2.8 kg (yield 70%) were obtained.

The butterbur fraction extract was added to silica gel TLC (Merck) and the mobile phase was developed at a ratio of butanol: methanol: ammonium hydroxide: water = 3: 2: 1: 2.

In the column thin layer chromatography confirmation test, the fraction extract was exposed to dark brown at R _f value of 0.6 by UV exposure at 254 nm, and dark brown spots at R _f value of 0.6 when heated to 100 ° C. after soaking in 10% sulfuric acid. Indicated. In addition, the Butterbur extract showed brown spots with iodine coloration at R _f value 0.6, and was negative in the color reaction of ninhydrin colorant and dragendrop colorant.

Example 3 Change Experiment of Long Term Potentiation by Administration of Butterbur Extract

(1) Changes in LTP by Administration of Butterbur Extract

end. Experimental Materials and Animals

Experimental material was used the crude colts extract prepared in Example 1, the experimental animals were used as a normal growth rat (Sparague Dawley rat, male).

I. Experiment method

In order to observe the LTP related to the effect on the memory enhancement of the coltsfoot extract, the colostrum extract was administered to the experimental animals through negative water [25% (2.5g / l) concentration for 3 weeks] (Morris Water Maze) was performed, and LTP measurement experiments were performed in the hippocampus at 5 weeks.

The method of learning the Morris Sumiro was made by swimming experiments twice a day for 5 days at a predetermined time every day to go to the target platform by starting the experimental animals at any two locations in the north, south, east and west.

The experimental animals trained with Morris Sumi were anesthetized by intraperitoneal injection with 20% urethane (7 ml / kg, Sigma, USA), and then fixed in a brain stereotactic device (stereotaxic, Stoelting, USA) for craniotomy. Was carried out.

For the measurement of LTP, the recording tungsten-microelectrode was placed on hippocampal CA1 cells and the stimulation electrode was placed on granular cells of dentate gyrus. The stimulation electrode is placed on the Schaffer collateral pathway and the recording electrode is placed on the Dendrite site of CA1 neurons. Convulsive stimulation was applied through the stimulation electrode to induce LTP, and when LTP was obtained, it was observed and recorded for 2 hours.

All. Experiment result

As shown in FIG. 1, the control group of normal beverage (n = 8, n is the number of experimental animals, which is equal to or less than the mean) showed an increase of potential of 9.42 ± 1.79% on average, and the beverage administration group containing colostrum crude extract ( n = 8) showed an LTP increase of 25.10 ± 4.4%. Both groups maintained significant differences (* p <0.05, ** p <0.01 vs control) during the experimental period.

The arrow (↑) notation in FIG. 1 represents the time point of convulsive stimulation, the data is expressed as mean ± standard deviation, and the significance was tested by student's t-test. One * notation denotes a portion where p <0.05, two ** notations denote a portion where p <0.01, and M denotes butterbur crude extract.

(2) Changes in LTP by Administration of Feed containing Butterbur Extract

end. Experimental Materials and Animals

Experimental material was used feed containing crude butter extract having the composition shown in Table 1.

Composition of Feed Containing Butterbur Extract Raw material name Compounding rate (%) Unit weight (mg) Manufacturing weight (kg) Example 1 (60% solids) 44.45 80.01 72.009 Soy Protein Powder 22.23 40.014 36.0126 Microcrystalline cellulose 15.0 27.0 24.3 Wheat Germ Powder 3.0 5.4 4.86 Dry yeast 2.4 4.32 3.888 Soybean Lecithin 1.8 3.24 2.916 Vitamin C 1.8 3.24 2.916 Powdered Vitamin E (50%) 0.9 1.62 1.458 Octacosanol (10%) 0.3 0.54 0.486 Di-maltol 0.15 0.27 0.243 Vitamin B6-Hydrochloride 0.06 0.108 0.0792 Magnesium Stearate 0.77 0.33264 1.2474 Corn Protein Extract Powder 0.57 0.24624 0.9234 Glycerin Fatty Acid Ester 0.03 0.01296 0.0486 Other (erythritol) 6.54 2.82528 10.5948 system 100% 180 mg 162 kg

Experimental animals used the same rats as in Experiment (1).

I. Experiment method

In order to evaluate the effect of the crude butterbur extract prepared in Example 1 to feed on LTP, experimental animals were anesthetized at 5 weeks and the change in LTP in the brain hippocampus was recorded.

The experiment was conducted in the same manner as in the method of (1) above.

All. Experiment result

As shown in FIG. 2, after feeding the feed for 4 weeks, the change in LTP in the brain hippocampus of the experimental animal (5 weeks) was recorded. As a control, the normal normal feed group (n = 8) was 10.55 ± 5.57%. , Crude butter extract extract prepared in Example 1 (including soybean oil, wheat germ oil, vitamin mix, α-tocopherol, etc.) administration group (n = 6) increased by 22.53 ± 3.91%, containing the butterbur crude extract of Table 1 The feed group (n = 6) showed an increase of 37.89 ± 7.04%, and LTP generated after stimulation (TBS) was maintained for more than 2 hours in both the normal feed group and the feed group containing butterbur extract. These results showed the same trend in the comparison of the experimental animals group administered the normal beverage and the beverage extract containing coltsfoot extract.

Arrow (↑) in Figure 2 shows the time point given the TBS stimulation after baseline recording for 10 minutes. All results were expressed as mean ± standard deviation, and the significance (*, p <0.05; **, p <0.01) was tested by student's t- test. M represents coltsfoot crude extract.

Therefore, the butterbur extract of the present invention can be confirmed that the LTP change assay of Example 3 has an effect on the enhancement of memory, the butterbur extract of the present invention passes through the blood brain barrier to protect the brain function and enhances the memory activity. It can be seen that the new drug material having.

Example 4 Effect of Butterbur Extract Administration on the Expression of Brain BDNF and CREB in Animals

The effect of administration of coltsfoot extract on the molecular mechanism of activity dependent regulation of CREB and BDNF release on memory learning was determined.

end. Experimental Materials and Animals

Experimental material was used crude butter extract prepared in Example 1, the experimental animal was used as a normal growth rat (Sparague Dawley rat, male).

I. Experiment method

The colostrum crude extract was administered (in 0.5% CMC) through negative water for 3 weeks, and the LTP data of the experimental animals were recorded and analyzed at 4 weeks. After the LTP recording, the cerebral cortex and hippocampus were separated from the whole brain as soon as possible, and total RNA was separated from the separated sample, and then the amount of the RNA was measured using a spectrophotometer. In addition, cDNA was synthesized using a MMVL reverse transcriptase from a sample, and the expression levels of BDNF and CREB were measured using the samples thus prepared.

All. Experiment result

As can be seen in the photographs of FIGS. 3 and 4, the BDNF (cortex, FIG. 3) and CREB (hippocampus, FIG. 4) in the coltsfoot crude extract administration test group (n = 7) compared to the control (n = 6) It can be seen that the expression is significantly increased. Therefore, the butterbur extract of the present invention was shown to be involved in the expression of BDNF and CREB mRNA, it can be seen that the butterbur extract of the present invention is a new drug material having a protective function of the brain function and enhances memory through the blood brain barrier.

<Example 5> Learning ability and memory enhancement effect of the coltsfoot extract

end. Experimental Materials and Animals

Experimental material was used as the crude colts extract of Example 1, the experimental animals were prepared in normal growth rats (Sparague Dawley rat, Wister rat, male, 180 ~ 200g body weight).

I. Experiment method

Crude crude extract prepared in Example 1 was administered to the experimental animals through a negative water [25% (2.5g / l) concentration for 3 weeks, and from the fourth week to the experimental animal Morris Sumi in the same manner as in Example 3 Learning was conducted (4 trials / day).

Probe trial test was performed 24 hours after the completion of the study and the time until the animals arrived at the platform (Escape time) was about 10 seconds. One experiment was performed to measure and compare the time and distance the rats entered and stayed within the quadrant area or 25 cm around the target. The working memory or the time difference (short term working memory) before and after appearing when the platform is moved to another location after completion of the first learning is shown in FIG. 5.

All. Experiment result

As shown in FIG. 5, the coltsfoot extract in normal rats was effective in enhancing both learning and working memory ability. In this result, it can be seen that the butterbur extract of the present invention is a new drug material having a potentiating activity of memory through the blood brain barrier.

Example 6 Effects of Learning and Memory Enhancement on Aged Rats

This example measures the effects of learning and memory enhancement on aged normal rats to determine if the extract of butterbur is expected to enhance memory in a broad range of adults and the elderly as well as adolescents.

end. Experimental Materials and Animals

Experimental material was used the crude colts extract of Example 1, and 22 months old rats (88 weeks old, Sparague Dawley rat, n = 16) was prepared as experimental animals.

I. Experiment method

 The colostrum crude extract was administered to experimental animals through a negative water [25% (2.5 g / l) concentration] for 12 weeks, and the probe test for the first learning in the Morris Sumiro learning in the same manner as in Example 5 Working memory was measured and spontaneous momentum was measured for 4 hours after the probe test compared to the control group.

All. Experiment result

As shown in FIG. 6, Morris Sumi showed significant memory differences in learning (n = 7-8, * p <0.05 vs control).

As shown in FIG. 7, the working memory by the probe test also increased about 1.4 times compared to the control.

In addition, as shown in Figure 8 shows that the experimental animal swims per unit time in the platform quadrant area (quadrant) significantly increased compared to the control. No significant difference in body weight and drinking volume was observed between the two groups during the administration period.

6, 7 and 8, M _H represents the butterbur crude extract.

Through such experiments, the butterbur extract of the present invention can be used as a medicine for preventing and treating diseases related to brain function deterioration due to memory loss in a wide range of classes by showing memory enhancement effect to the elderly.

<Example 7> learning ability and short-term memory enhancement effect of crude butter extract

end. Experimental Materials and Animals

Experimental material was prepared by extracting the coltsfoot extract prepared in Example 1, the experimental animals were prepared in normal growth rats (Wister rat, male).

I. Experiment method

The crude butterbur extract prepared in Example 1 was administered to the experimental animals by means of negative doses (200mg / kg, 400mg / kg) for 3 weeks, and from the fourth week, the study was conducted with Morris Sumi.

The Morris Sumi learning is to learn the swimming animals repeatedly swimming four times a day for 1 week to find the target within 10 seconds and after 24 hours to move the platform to the opposite position when learning with Morris Sumi We compared and measured the learning index of the escape time for the first and second targets.

All. Experiment result

In this test, as the Learning Index increases, the short-term memory is improved. As can be seen in FIG. 9, the learning index time of the control group is 1.38 times at the 200 mg / kg dose of butterbur extract and 1.87 times at the 400 mg / kg dose as compared to the control group. It has been shown to have a memory-enhancing effect of soybean extract, which has a dose-dependent (n = 8, * p <0.01 vs control, ** p <0.05 vs control) effect in short-term memory. have.

In Figure 9, M is the coltsfoot crude extract and C represents a control.

<Example 8> learning ability and short-term memory enhancement effect of the butterbur fraction extract

end. Experimental Materials and Animals

Experimental material was used in the coltsfoot extract prepared in Example 2, the experimental animals were prepared from normal growth rats (Sparague Dawley rat, male).

I. Experiment method

Butterbur fraction extract prepared in Example 2 was administered to the experimental animals for 4 weeks by dose (120mg / kg, 240mg / kg, 480mg / kg) through the drinking water, and from the fifth week to study with Morris Sumi Was carried out.

The Morris Sumi learning is to learn the swimming animals repeatedly swimming four times a day for 1 week to find the target within 10 seconds and after 24 hours to move the platform to the opposite position when learning with Morris Sumi We compared and measured the difference between the escape times of the first and second targets (memory index).

All. Experiment result

As can be seen in Figure 10, the Memory Index time of the control group was 16.58 ± 5.56 (sec), but the experimental animal administered the butterbur fraction extract from 32.46 ± 5.15 (sec), 240 mg / kg dose to 120 mg / kg dose At 45.28 ± 5.90 ^* (sec), 480mg / kg dose was 33.48 ± 17.06 (sec) to 240mg / kg, dose-dependent (n = 5, * p <0.05 vs control).

MW in Figure 10 shows the fraction extract of butterbur.

As a result of comparing Examples 7 and 8, the crude extract of the butterbur extract showed an enhancement effect of 1.38 times and 1.87 times at 200 mg / kg to 400 mg / kg dose, respectively, while the extract of the butterbur extract was 120 mg / kg and 240 mg / kg. At doses of 1.96 and 2.73 times, respectively, the most remarkable enhancement was the dose of extract (240mg / kg), which was about twice as low, while the memory enhancement effect was 240mg / kg. It can be seen that the memory enhancement effect was about 1.5 times higher than that of the crude butterbur extract at 2.73 times of the control group.

Example 9 Memory Enhancement Effect of Butterbur Extract

end. Experimental Materials and Animals

Experimental material was used for extracting the fraction of butterbur prepared in Example 2, the experimental animals prepared a normal growth sand rat (Mongolian gerbil, male).

I. Experiment method

Fractional extracts of butterbur were administered to the experimental animals through a negative dose (125mg / kg, 250mg / kg) for 5 weeks, and from the 6th week, a step down latency test (passive avoidance test) was performed on the experimental animals. Was carried out.

The passive avoidance test was performed by applying an electric shock of 0.4 mA when the test animal descended to the grid, and comparing and measuring the latency time of staying on the platform after 24 hours without descending to the grid.

All. Experiment result

In this test, as the latency time increased, the memory was improved. As can be seen in FIG. 11, the passive avoidance reaction time of the control group was 54.8 ± 17.6 (sec), but the experimental animals administered the butterbur fraction extract at 125 mg / kg dose. Dose-dependent (n = 8 ~ 10, * p <0.05 vs control) in experimental animals treated with Butterbur fraction extract at 101.6 ± 21.5 ^* (sec), 250mg / kg dose at 133.6 ± 39.2 ^* (sec) It has been shown to enhance memory.

In Figure 11, MW shows the butterbur fraction extract.

Example 10 Safety (Acute Toxicity and Subacute Toxicity) Experiments

In order to confirm whether the extract of butterbur of the present invention is toxic to the human body, the following animal experiment was performed.

(1) Acute Toxicity Test

end. Experimental Materials and Methods

Experimental material was prepared from crude coltsfoot extract prepared in Example 1, the experimental animals were prepared 14 ICR mice.

I. Experiment method

Crude crude extract was administered to the experimental animals by dose (water content 23%; 2g / kg, 4g / kg) through the negative, and the weight change and survival of the experimental animals before and after administration were observed for 72 hours.

All. Experiment result

All animals survived within 72 hours, and the average weight gain was 3.3 g and 2.5 g, respectively, in the control group of 2 g / kg and 4 g / kg crude butterbur extract, respectively, and LD was increased even at 6 g / kg bw dose. ₅₀ could not be observed. For reference, the Korea Food and Drug Administration (KFDA) safety standards are less than 2g / kg bw, so the coltsfoot extract is considered safe.

(2) Subacute Toxicity Test

end. Experimental Materials and Animals

The same experimental material as in the test of (1) was used, and experimental animals were prepared with 13 ICR mice.

I. Experiment method

The average body weight was observed by oral administration to the experimental animals at a dose of 2 g / kg bw / day for 2 weeks.

All. Experiment result

No change was observed in the range of mean weight gain of the test animals, and all survived.

Through such safety experiments it is determined that the butterbur extract of the present invention does not adversely affect the human body.

As described above, the butterbur extract of the present invention solves the problem of the brain brain barrier by having a protective effect on brain function and enhancing the ability of memory to pass through the blood brain barrier as an effect verification through in vivo experiments in natural products with little side effects. It is a new drug material for improving function.

In addition, the pharmaceutical composition for improving brain function containing the coltsfoot extract according to the present invention as an active ingredient, the electrophysiology associated with the evaluation of LTP induction, BDNF (Brain Derived Neurotropic Factor) and CREB (cAMP Responsive Element Binding Protein) expression As confirmed in the study, it is effective in improving brain function by passing through the blood brain barrier and showing enhanced function of brain function protection and memory, and can be useful for improving brain function to a wide range of adolescents, adults and the elderly. It can be usefully developed as a medicine for the improvement of senile brain diseases (forgetfulness, dementia, Alzheimer's disease, etc.).

Claims (9)

delete delete delete delete delete Extracted by adding 70% ethanol to the coltsfoot, followed by the addition of an aqueous ethyl acetate solution to separate the water layer, which is obtained from the aqueous layer, containing the coltsfoot fraction extract having the properties described below as an active ingredient and a pharmaceutically acceptable carrier. Memory enhancer comprising a. Column thin layer chromatography identification test; UV at 254 nm: Absorb as dark brown at R _f value of 0.5 ~ 0.8 (Mobile phase: Butanol: Methanol: Ammonium hydroxide: Water = 3: 2: 1: 2), Soaked in 10% sulfuric acid and heated to 100 ℃: Dark brown spot at R _f value 0.6, Iodine color development: brown spots at R _f values of 0.5 to 0.8 Solubility: Soluble in distilled water, 0.1% soluble in methanol, insoluble in hexane, ethyl acetate, ethanol, acetone, ether, benzene, PH of aqueous solution: 5.0 ~ 8.0, Color reaction; Ninhydrin development reagent and dragen rope development reagent: negative. delete delete delete

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