KR20170013620A - Microemulsion composition of natural product extract with enhanced oral absorption and process for the preparation thereof - Google Patents

Abstract

The present invention relates to a microemulsion composition comprising a herb medicine extract and a microemulsion including omega-3 unsaturated fatty acids, a surfactant, and water; and to a preparation method thereof. The microemulsion composition comprising a herb medicine extract and omega-3 unsaturated fatty acids achieves an effect of effectively improving oral absorption of the herb medicine extract including insoluble active components, thereby being useful as an oral administration delivery system.

Description

TECHNICAL FIELD The present invention relates to a microemulsion composition of a herbal medicine extract having enhanced oral absorption rate and a method for producing the microemulsion composition,

The present invention relates to a microemulsion composition of herbal medicine extract having enhanced oral absorption rate and a method for producing the microemulsion composition, and more particularly, And microemulsions comprising omega-3 unsaturated fatty acids, surfactants and water, and a process for their preparation.

Angelica gigas is a biennial or perennial plant grown in Northeast Asia such as China, Japan and Korea. Angelica gigas Nakai (AGN) has been cultivated in Korea, and dried root of Angelica gigas Nakai is used as herb medicine. Compounds contained in root, stem and leaf of Angelica angustifolia include pyranocoumarin, simple coumarin, furocoumarin, phthalide, volatile compounds, polyacetylenes polyacetylene, flavonoid, organic acid, polysaccharide, and phenolics (Zhang et al., 2012). Among them, pyranocoumarin is a major component of alcohol extract of Angelica giganta, and decursin (D), decursinol angelate (DA), and decursinol (DOH) It is a coumarin ingredient. These major components have been known to have various pharmacological effects such as analgesic, anti-cancer, anti-inflammatory, anti-obesity, anti-diabetic and cognitive enhancing effects (Hwang et al., 2012; Kang et al., 2003; Seo et al., 2009; Shin et al., 2009; Yim et al., 2005; Zhang et al., 2012). However, these major components have very low solubility in water and have limited use as a diet or medicine (Mahat et al., 2012; Piao et al., 2015).

Meanwhile, a variety of formulations have been developed to increase the solubility and bioavailability of the pharmacologically active ingredient contained in natural products (Jeetha et al., 2014; Lee et al., 2014; Piao et al., 2015; Yoon et al., 2015). As a method of formulating such natural products, a colloidal dispersion system having a nano-level particle size can be applied. As a solubilization system based on oils, surfactants and water, a microemulsion (ME), which is a transparent, thermodynamically stable isotropic liquid mixture, has been used for improving the solubility and mucosal absorption of drugs (Cho et al. 2012; Doh et al., 2013). Emulsion systems containing omega-3 unsaturated fatty acids have also been reported for delivery of multiple drugs (Deshpande et al., 2013; Gulotta et al., 2014).

However, no microemulsion system has been developed which effectively improves oral absorption of herbal medicine extracts containing poorly soluble active ingredients until now, and it has been found that a microemulsion having an improved stability that maintains the morphology of droplets for a long period of time, System development is required.

Korean Patent Publication No. 2006-0120175 (November 24, 2006) Korean Patent Publication No. 2014-0043253 (Apr.

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The present inventors have been studying a microemulsion system having improved stability along with an improvement in oral absorption rate, wherein a microemulsion system comprising an omega-3 unsaturated fatty acid fish oil-based colloid system, i.e., omega-3 unsaturated fatty acid, It has been found that it maintains stability for 10 days, increases the release of the active ingredient contained in herbal medicine extract in a gastrointestinal fluid-like environment, and shows an effect of effectively improving gastrointestinal absorption of the poorly soluble active ingredient.

Accordingly, the present invention relates to a herbal medicine extract; And a microemulsion comprising an omega-3 unsaturated fatty acid, a surfactant and a water-containing microemulsion.

According to one aspect of the present invention, a herbal medicine extract; And a microemulsion comprising an omega-3 unsaturated fatty acid, a surfactant and water.

In one embodiment, the microemulsion composition may further comprise D-alpha-Tocopherol polyethylene glycol 1000 succinate (TPGS) and may be present in an amount of 0.005 to 2%, based on the total microemulsion composition, (w / v).

In one embodiment, the herbal medicine is at least one selected from the group consisting of Angelica gigas, Angelica gigas and Chinese angelica; Purkinje; curcuma; rhubarb; Schisandra; Ginseng; dermis; And gold. ≪ / RTI > Further, the herbal medicine extract may contain hot water; Alcohols consisting of methanol, ethanol, isopropanol and butanol; ether; Ethyl acetate; Acetone; And methylene chloride, or may be extracted with one or more extraction methods selected from the group consisting of high-frequency extraction method, extrusion melting method, and supercritical extraction method, and may be extracted with at least one solvent selected from the group consisting of 0.01 ~ 5% (w / v).

In one embodiment, the omega-3 unsaturated fatty acid may be at least one selected from the group consisting of alpha-linolenic acid, eicosapentaenoic acid, and docosahexaenoic acid, and the surfactant may be at least one selected from the group consisting of caprylocaproylmacrol- 8 glycerides, caprylocaproyl polyoxyl-8 glycerides, and combinations thereof.

In one embodiment, the microemulsion may comprise from 1 to 25% by weight of omega-3 unsaturated fatty acids, from 25 to 80% by weight of a surfactant, and from 5 to 70% by weight of water, based on the total weight of the microemulsion.

Further, according to one aspect of the present invention, there is provided a method for producing omega-3 fatty acids, comprising: (a) mixing an omega-3 unsaturated fatty acid and a surfactant to prepare a mixture; (b) adding water to the mixture prepared in step (a) to prepare a microemulsion; And (c) dissolving the herbal extract in the microemulsion prepared in step (b).

In one embodiment, D-alpha-tocopherol polyethylene glycol 1000 succinate may be further mixed in step (c).

According to the present invention, a herbal medicine extract; And microemulsions comprising microemulsions comprising omega-3 unsaturated fatty acids, surfactants and water have a spherical morphology with a droplet size of 205-277 nm and have no change in mean diameter of the droplet at room temperature for 10 days, (D) and decathynol angelate (DA), which are the major components of Angelicae giganta, from the microemulsion formulations at both pH 1.2 and 6.8 conditions, were significantly elevated in comparison to the suspension of Angelica gigantis extract . In addition, the microemulsion composition of the present invention, particularly, the TPGS-containing microemulsion composition effectively improves gastrointestinal tract absorption of herbal medicine extracts containing an insoluble active ingredient, and thus is useful for oral administration of herbal medicine extracts containing an insoluble active ingredient Delivery system.

Therefore, the herbal medicine extract of the present invention; And microemulsions comprising omega-3 fatty acids, surfactants and water can achieve the effect of effectively improving the oral absorption of herbal medicine extracts containing an insoluble active ingredient, which is useful for oral administration delivery systems .

Figure 1 is a pseudo three-phase diagram of a microemulsion system based on oil (omega-3 unsaturated fatty acid), S (surfactant, labrasol) and DW (water), showing a microemulsion region ) Is displayed.
Figure 2 is a micrograph (A) of drug-free microemulsions (Blank F1 and Blank F2), Angelica giganta extract-containing microemulsions (F1 and F2), and AGS suspension in DW; And the TEM photograph (B) of Angelica giganta extract-containing microemulsions (F1 and F2) (the length of the reference is 0.5 占 퐉).
Figure 3 is a graph depicting the in vitro stability of Angelica gigantosa extract-containing microemulsion systems (F1 and F2) according to incubation time (mean diameter of microemulsion formulations were measured after 5 days and 10 days of culture, (n = 3)).
Figure 4 shows D (A) and DA (B) emissions from suspension of Angelica giganta ethanol extract (AGN ethanol extract) and Angelica gigantosa extract-containing microemulsions (F1 and F2) under pH 1.2 conditions; And D (C) and DA (D) released at pH 6.8 (data are shown as the mean ± SD (n = 3) and * P <0.05 compared to the ethanol extract of Angelica gigantei).
FIG. 5 is a result of in vivo pharmacokinetic evaluation in which an aspect of DOH concentration in plasma was measured after oral administration of suspension of Angelica giganta ethanol extract (AGN ethanol extract) and Angelica gigantosae extract-containing microemulsion (F1 and F2) to rats Is expressed as the mean ± SD (n = 4)).

The present invention relates to herbal extracts; And a microemulsion comprising omega-3 unsaturated fatty acids, a surfactant and water.

In the microemulsion composition of the present invention, D-alpha-tocopherol polyethylene glycol 1000 succinate may be further included as a permeation accelerator.

D-alpha-Tocopherol polyethylene glycol 1000 succinate (TPGS) is a mixture of alpha - [4 - [[(2R) -3,4-dihydro- 6-yl] oxy] -1,4-dioxobutyl] -? - hydroxy (2- - (4 - [[(2R) -3,4-dihydro-2,5,7,8-tetramethyl-2- [(4R, 8R) -4 , 8,12-trimethyltridecyl] -2H-1-benzopyran-6-yl] oxy] -1,4-dioxobutyl] - omega -hydroxy-poly (oxy-1,2-ethanediyl), C ₃₃ O ₅ H ₅₄ CH ₂ CH ₂ O) _n is a synthetic amphipathic substance that transports α-tocopherol (vitamin E), a lipophilic antioxidant, through enzymatic degradation to the cell membrane, and is a water-soluble vitamin E nutritional supplement and FDA- to be. The microemulsion composition of the present invention can be prepared by further adding TPGS to a microemulsion system for the purpose of improving intestinal absorption of D and DA.

In the microemulsion composition of the present invention, the TPGS may be contained in an amount of 0.005 to 2% (w / v) based on the total amount of the microemulsion composition, preferably 0.05 to 1% (w / v) To 0.5% (w / v), most preferably 0.3 to 0.5% (w / v).

The microemulsion composition of the present invention has been developed in order to solubilize an extract of a herbal medicine containing a water-insoluble component as a main component to increase the absorption rate of the gastrointestinal tract of the active ingredient contained in the herbal extract, At least one selected from the group consisting of Angelica keiskei and Chinese angelica; Purkinje; curcuma; rhubarb; Schisandra; Ginseng; dermis; And gold, but is not limited thereto.

The organic solvent used in the production of the herbal medicine extract of the present invention is not particularly limited as long as it is an organic solvent for extracting the water-insoluble component contained in the herbal medicine, but it is preferably methanol, ethanol, isopropanol, Made alcohol; ether; Ethyl acetate; Acetone; And methylene chloride. It can also be extracted by hot water or by one or more extraction methods selected from the group consisting of a high frequency extraction method, an extrusion melting method, and a supercritical extraction method.

Specifically, the herbal medicine (for example, Angelica gigas) is dried in an oven or the like, cooled at room temperature, immersed in an organic solvent (for example, ethanol) and heated under specific conditions , Extracting the active ingredient from the herbal medicine, and then drying it to obtain a herbal medicine extract.

The herbal medicine extract may be contained in an amount of 0.01 to 5% (w / v), preferably 0.1 to 2.5% (w / v), more preferably 0.2 to 2% (w / v) based on the total amount of the microemulsion composition. , And most preferably 0.5 to 1.5% (w / v).

The omega-3 unsaturated fatty acids included in the present invention may be at least one selected from the group consisting of? -Linolenic acid, eicosapentaenoic acid and docosahexaenoic acid.

Omega-3 unsaturated fatty acid refers to polyunsaturated fatty acids (PUFAs) having a double bond at the third position from the end of the carbon chain. The omega-3 unsaturated fatty acid types associated with human physiology were α-linolenic acid (ALA, detected in vegetable oil, 18: 3), eicosapentaenoic acid (EPA, detected in fish oil, 20: 5 ), And docosahexaenoic acid (DHA, detected in fish oil, 22: 6). EPA and DHA in omega-3 unsaturated fatty acid fish oil have been shown to be effective in atopic disease, cancer, cardiovascular disease, cognitive decline, depression, and inflammation (Cederholm et al., 2013; Hashimoto et al. 2014; Jing et al., 2013; Klemens et al., 2011; Mori, 2014; Yates et al., 2014). (Cederholm et al., 2013; Kang et al., 2003), the extract of Angelica gigas Nakai as an herbal extract was included in the present invention And the microemulsion composition of the present invention containing omega-3 unsaturated fatty acid as a component of the microemulsion system can be usefully used as a dietary supplement component and a medicine for enhancing cognitive function.

Surfactants included in the present invention may be caprylocaproyl macrogol-8 glyceride and / or caprylocaproyl polyoxyl-8 glyceride and may be commercially available And Labrasol, a caprylocaproyl macrolide-8 glyceride and / or caprylocaproyl polyoxyl-8 glyceride surfactant, may also be used. The labrasol used in the examples of the present invention is a mixture of mono- and di-fatty acid esters of mono-, di- and tri-glycerides and polyethylene glycols, non-ionic surfactants having amphipathic nature and dispersible in water and It is an oily liquid and is used as a solubilizing agent, an absorption enhancer of an insoluble drug, and a surfactant. Polyethylene glycol (PEG) esters, small-scale glyceride moieties, and unconjugated PEG, with an HLB value of 12-14.

In the microemulsion composition of the present invention, the microemulsion may comprise from 1 to 25% by weight of omega-3 unsaturated fatty acids, from 25 to 80% by weight of a surfactant and from 5 to 70% by weight of water, based on the total weight of the microemulsion; Preferably 3 to 15% by weight of omega-3 unsaturated fatty acids, 35 to 65% by weight of a surfactant and 20 to 60% by weight of water; More preferably 5-12 wt% omega-3 unsaturated fatty acid, 45-55 wt% surfactant and 35-45 wt% water; Most preferably 8 to 9% by weight omega-3 unsaturated fatty acid, 52 to 53% by weight of a surfactant and 39 to 40% by weight of water.

The composition of the microemulsion may be determined by a pseudo three-phase diagram created according to conventional methods for determining the composition of the microemulsion system (e.g., water titration method). Particularly, it has been found that a composition comprising an oil phase (e.g., omega-3 unsaturated fatty acid) and a surfactant (e.g., Labrasol) at different weight ratios in a specified ratio (e.g., 1: 9 to 9: After mixing thoroughly, a pseudo three-phase diagram can be created by displaying the points corresponding to the areas of transparency and opacity by observing the color change between transparency and opacity while adding water to each percentage of oil and surfactant mixture . It is possible to determine the composition of the microemulsion system in which the microemulsion region (single phase region) is determined in the created similar three-phase diagram and the specific composition among the compositions contained in this region is selected to dissolve the herbal extract.

The present invention also provides a method for preparing a mixture comprising: (a) mixing an omega-3 unsaturated fatty acid and a surfactant to prepare a mixture; (b) adding water to the mixture prepared in step (a) to prepare a microemulsion; And (c) dissolving the herbal extract in the microemulsion prepared in step (b).

In one embodiment, D-alpha-tocopherol polyethylene glycol 1000 succinate may be further mixed in step (c).

Step (a) is a step of mixing a omega-3 unsaturated fatty acid, which is an oil phase, with a surfactant to form a transparent solution.

Step (b) is a step of preparing a microemulsion system without the herbal extract by adding an amount of water determined from the microemulsion region of the similar three-phase diagram to the transparent solution prepared in step (a).

Step (c) is a step of dissolving the herbal extract in the microemulsion system prepared in step (b) to prepare a final microemulsion composition containing the herbal extract.

Microscopic photographs of the suspension of the microemulsion composition of the present invention and herbal medicine extract showed that the herbal medicine extract suspension did not completely dissolve in the water to form a precipitate while the microemulsion composition of the present invention was completely dissolved Thereby forming microemulsion formulations F1 and F2 in a clear solution state (see Fig. 2 (A)). The microemulsion composition of the present invention was observed by a transmission electron microscope. As a result, it was confirmed that the droplet was in a spherical form (see Fig. 2 (B)) and the average diameter of the microemulsion in the absence of the drug was 112-132 nm, The average diameter of the microemulsion composition in which the extract was dissolved was measured at 205-277 nm to form nano-sized droplets, and the polydispersity index was determined to show a narrow range of size distribution (see Table 2) ).

In addition, it was confirmed that the microemulsion composition of the present invention maintained stability without changing the average diameter of droplets at room temperature for 10 days (see FIG. 3), and the microemulsion formulations (pH 1.2 and 6.8 buffer) F1 and F2) was significantly higher than that of Angelica gigantea ethanol extract (suspension) (see FIG. 4).

Further, the pharmacokinetic characteristics of DOH (the major metabolites of D and DA as active ingredients of Angelica gigas) after oral administration of the microemulsion composition of the present invention were evaluated. As a result, the microemulsion composition (F1) of the present invention , The TPGS-containing microemulsion composition (F2) group was found to have an increased AUC value and _Cmax value as compared with the Angelica gigantae ethanol extract (suspension) group, thereby effectively improving the gastrointestinal absorption of the Angelica gigantosa extract containing the insoluble active ingredients D and DA (See Fig. 5 and Table 3).

Hereinafter, the present invention will be described in more detail by way of examples. However, these examples are for illustrative purposes only, and the scope of the present invention is not limited to these examples.

< Example >

1. Materials and Statistics Processing

Angelica gigas Nakai (AGN) was purchased in the local market of Pyeongchang (Republic of Korea). Fish-derived docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) omega-3 unsaturated fatty acids were purchased from ONC (Ocean Nutrition Canada Ltd., Dartmouth, Nova Scotia, Canada). Polyethylene glycol (PEG) -8 Caprylic / Capric Glycerides (polyethylene glycol (PEG) -8 caprylic / capric glyceride, Labrasol ®) was provided from gate porcelain four (Gattefosse, Cedex, France). D-alpha-Tocopherol polyethylene glycol 1000 succinate (TPGS) was purchased from Sigma-Aldrich Co. (St. Louis, Mo., USA). Standard products of Decker's (D), Decker's Angelate (DA), and Deckersinol (DOH) were provided by the Korea Promotion Institute for Traditional Medicine Industry, Gyeongsan, Korea. All solvents used were HPLC grade and other compounds were used without purification as assay grade.

All experiments were performed at least 3 times and data were expressed as mean ± SD. Statistical analysis was performed with two-tailed t-test and analysis of variance (ANOVA).

2. Preparation of ethanol extract of Angelica gigas

Angelicae AGN was dried in an oven at 55 ° C for 24 hours and then cooled at room temperature. The dried Angelica gigas was immersed in ethanol (EtOH) and heated at 80 ° C for 2 hours to extract the active ingredient from Angelica gigas Nakai. The dried Angelica keiskei koidz.

The contents of major components (D, DA, and DOH) of ethanol extract of Angelica gigas were measured as 61.00 ± 12.63 mg / g, 49.30 ± 12.13 mg / g and 2.19 ± 0.04 mg / al., 2015). The solubilities of D and DA in distilled water were similar to those of the prior art (Piao et al., 2015) with 1.68 ± 0.23 mg / g and 1.50 ± 0.20 mg / g respectively (the amount of each component per weight of Angelica giganta extract). The solubilities of D and DA in the omega - 3 unsaturated fatty acids from ethanol extract of Angelica gigas were 55.74 ± 2.08 mg / g and 42.34 ± 1.65 mg / g, respectively, which were 33.18 and 28.23 times higher than those in DW, respectively.

The solubilities of D and DA from labial extracts of Angelica gigas Nakai were 49.13 ± 4.50 mg / g and 37.49 ± 3.56 mg / g, respectively, which were 29.24 and 24.99 times higher than those of DW, respectively. The solubility enhancing effect of D and DA in labrasol was useful for the o / w microemulsion system for effective ingredient delivery of Angelica gigas.

3. Similar 3 phases  Creating Diagrams

A similar three-phase diagram was created using the water titration method as described below, and was followed by a three-phase diagram using omega-3 unsaturated fatty acids (oil), labrasol (surfactant) and water- / w) microemulsion system was determined.

First, the oil phase (omega-3 unsaturated fatty acid) and the surfactant (Labrasol) were thoroughly mixed at different weight ratios ranging from 1: 9 to 9: 1. The color change between transparency and opacity was observed while distilled water (DW) was slowly added to each ratio of oil and surfactant mixture. A pseudo three-phase diagram was created by marking points corresponding to areas of transparency and opacity as described in the prior art (Gatri et al., 2000; Hathout et al., 2010). The microemulsion region (single phase region) was determined in the created pseudo three-phase diagram, and the results are shown in Fig. 1 (omega-3 unsaturated fatty acid and labascol respectively expressed as oil and S).

1 (oil: 8.7%; S: 52.2%; DW: 39.1%, w / w) was selected from among the microemulsion regions shown in the similar three-phase diagram of Fig. 1 to prepare a microemulsion system . In order to improve the pharmacological efficacy (cognitive enhancement) of omega-3 unsaturated fatty acids in the preparation of microemulsion formulations, omega-3 unsaturated fatty acids are used in a high proportion and in order to reduce the toxicity of labrasol, .

4. Angelica gigantosa extract-containing Microemulsion  Produce

An oral microemulsion formulation containing the ethanol extract of Angelica gigas was prepared as follows.

The microemulsion system based on omega-3 unsaturated fatty acids, labasol and water selected from the above was made into drug-free microemulsions (Blank F1 and Blank F2) without drug. In this system, F2 formulation was prepared by dissolving Angelica giganta ethanol extract at 10 mg / ml in completely solubilized form F1 and F1 formulated with TPGS at 5 mg / ml. Composition of F1 formulation and F2 formulation is shown in Table 1 below.

Furtherance( % ) F1 F2 Labrasol (w / w) 52.2 52.2 DW (w / w) 39.1 39.1  Omega-3 unsaturated fatty acids (w / w) 8.7 8.7 TPGS (mg / ml) - 5 Angelica ethanol extract (mg / ml) 10 10

5. Identification of physicochemical properties of prepared Angelica gigantosa extract-containing microemulsion

To evaluate the properties of the prepared microemulsion system, the following tests were carried out on drug-free microemulsions (Blank F1 and Blank F2), drug-containing F1 and F2 formulations, and suspension of Angelica gigantosa extract in DW.

Fig. 2 (A) is a micrograph of drug-free microemulsions (Blank F1 and Blank F2), drug-containing F1 and F2 formulations, and suspension of Angelica gigantosa extract in DW. As shown in Fig. 2 (A), the Angelica giganta ethanol extract was not completely dissolved in the DW at a concentration of 10 mg / ml, and thus, a precipitate was formed in the lower part of the test vessel as shown in the AGS suspension of Angelica gigas extract Respectively. On the other hand, in the microemulsion system, the Angelica gigantae ethanol extract was completely dissolved to form microemulsion formulations (F1 and F2) of a clear solution throughout the formulation.

In addition, the morphology of the microemulsions (F1 and F2) containing the Angelica giganta ethanol extract was observed using a transmission electron microscope (TEM) as described below. That is, a predetermined amount of the microemulsion formulation was placed on a film copper grid, dyed with a solution of 2% (w / v) phosphotungstic acid, washed with distilled water, Lt; / RTI &gt; The dried samples were observed using a TEM (JEM 1010; JEOL, Tokyo, Japan) and the results are shown in Fig. 2 (B). As shown in Fig. 2B, the microemulsion droplet was confirmed to be spherical.

In addition, the particle size, polydispersity index and zeta potential of the drug-free microemulsion and Angelica gigantosa extract-containing microemulsion (F1 and F2) formulations were determined according to the protocol of the manufacturer (ELS; ELS-Z1000; Otsuka Electronics, Tokyo, Japan) (ELS). The results are shown in Table 2 below. &Lt; tb &gt; &lt; TABLE &gt;

Formulation
Average diameter
(nm) Polydispersity  Indices Zeta potential
(mV) F1
Drug-free
Microemulsion 131.5 ± 14.4 0.22 ± 0.01 -0.41 + 0.13 Angelica gigantosa extract-containing microemulsion 205.1 ± 50.2 0.17 ± 0.05 0.33 + 0.11 F2
Drug-free
Microemulsion 112.1 ± 24.5 0.25 0.09 -0.13 + - 0.10 Angelica gigantosa extract-containing microemulsion 276.7 ± 26.5 0.22 0.02 0.04 0.25 Data are expressed as mean ± SD (n≥3).

As shown in Table 2, the mean diameter of the drug-free F1 and F2 systems was 112-132 nm. After solubilizing the ethanol extract of Angelica gigas Nakai (10 mg / ml) in the drug-free microemulsion formulation, the mean diameter increased to 205-277 nm. In conclusion, it has been confirmed that the F1 and F2 formulations exhibit nano-sized droplets and a narrow range of size distributions.

6. Assessment of incubation period-dependent stability

The microemulsion system was incubated at room temperature for 5 days and 10 days, and the average diameter of the droplets was measured. The effect of the incubation period on the stability of the prepared microemulsion system was evaluated. The results are shown in FIG. 3 .

As shown in Fig. 3, there was no significant difference between the two formulations of F1 and F2 formulations (P > 0.05), confirming that the stability was maintained at room temperature for up to 10 days.

7. In vitro  Emission test

The release patterns of D and DA from microemulsion formulations in pH 1.2 and 6.8 buffer containing 0.1% (w / v) Tween 80 were evaluated as follows.

First, ethanol extract of Angelica gigas Nakai (1 mg) suspended in DW (0.1 ml) or 0.1 ml of Angelica gigantosae extract-containing microemulsion was dialyzed into a dialyzed tube (mini GeBA-flex dialysis tube, 14 kDa molecular weight cut- Bio-Application Ltd., Kfar Hanagide, Israel). The dialyzed tube containing the sample was placed in a pH 1.2 buffer solution (pH 7.5) containing 0.1% (w / v) Tween 80 and cultured at 37 ° C in a shaking bath at a stirring speed of 100 rpm. A predetermined amount (0.5 ml) of the release test solution was taken at a predetermined time (30, 120, and 240 minutes) and a new test solution of the same volume was replenished.

The released D and DA were analyzed by a known method (Jiang et al., 2015; Piao et al., 2015) and analyzed by liquid chromatography-tandem mass spectrometry (LC-MS / MS) And analyzed quantitatively. To determine the D and DA contents of ethanol extract of Angelica gigas Nakai, a certain amount (2 μl) or a predetermined amount (2 μl) of the ethanol extract of Angelica gigas Nakai dissolved in methanol (2.5 μg / ml) MS / MS system equipped with a 1260 Infinity HPLC system, Agilent Technologies, Wilmington, Del., USA) and an LC / MS system (Agilent Technologies 6430 Triple Quad LC / MS system). Peak separation of D and DA was performed using a column (Kinetex 2.6 μC18 100A column, 100 × 4.6 mm; Phenomenex, Torrance, CA, USA) and a total column (C18 guard column, 4 × 2.0 mm; Phenomenex). The mobile phase was prepared by mixing acetonitrile (A) and 0.2% aqueous formic acid solution (B) and maintained at a flow rate of 0.5 ml / min. The elution gradient program is divided into two groups: (1) 0-1 minutes A: B = 20:80 (v / v), (2) 1-45 minutes A: B = 20:80 to 70:30, A: B = 70:30, (4) 50-51 minutes A: B = 70:30 to 20:80, and (5) 51-60 minutes A: B = 20:80. The ESI source was optimally set to 300 ° C gas temperature, 11 l / min gas flow rate, 15 psi nebulizer pressure, and 4000 V capillary voltage, respectively. The fragmentation transitions of D and DA were consistent at m / z 329.2 to 229.1. The fragmentation voltage and the collision energy were set at 130 V and 18 eV, respectively. The retention times of D and DA in the above analysis conditions were 34.3 minutes and 34.7 minutes. Data processing was performed with the corresponding program (MassHunter Workstation Software Quantitative Analysis, Version B.05.00; Agilent Technologies). D and DA concentrations ranged from 5-1,000 ng / ml, and the precision and accuracy of D and DA were within acceptable limits.

The results of evaluating D and DA release from each formulation in pH 1.2 and 6.8 buffer solutions simulating gastric juice and intestinal fluids are shown in FIG. 4, and the two major components D and DA released from each formulation were incubated for 4 Time. In the pH 1.2 and 6.8 buffers, the solubility values of D and DA from Angelica giganta ethanol extracts were lower than 1.5 mg / g (the amount of each component per weight of Angelica giganta ethanol extract). Considering the extraction efficiency (<5%) of D and DA in pH 1.2 and pH 6.8 buffer after 2 hours incubation (ratio between the medium and the solubility in the content contained in the Angelica giganta ethanol extract) D and DA in the case of the present invention.

In addition, as shown in Fig. 4, the release of D and DA from Angelica giganta ethanol extracts was lower than 12% even after 4 hours in both pH 1.2 and 6.8 buffer solutions. In contrast, the amounts of D and DA released from the microemulsion formulations (F1 and F2) were significantly higher (P <0.05) than in the Angelica gigantea ethanol extract group. Also, the D and DA release rates increased with incubation times (30, 120, and 240 min) in both conditions (pH 1.2 and 6.8 buffer). There was no significant difference in the release of the active ingredients, i.e., D and DA, in the F1 and F2 formulations, indicating that there was no effect on the inclusion of TPGS in the microemulsion system. The increased solubility of D and DA in the microemulsion system is believed to have an effect on the increase in release, and an increase in release in the gastrointestinal fluid-like test solution is expected to contribute to increased absorption in the gastrointestinal mucosa.

8. In vivo  Pharmacokinetic assessment

The pharmacokinetics of DOH were compared after oral administration of suspension of Angelica giganta ethanol extract (AGN ethanol extract) and Angelica gigantosa extract - containing microemulsion (F1 and F2). In addition, it has been reported that oral absorbed D and DA are mainly metabolized from liver to DOH (Li et al., 2013; Park et al., 2012; Piao et al., 2015) Oral absorption of D and DA was assessed from each formulation containing the extract. DOH has been known to have a variety of pharmacological efficacies such as anti-angiogenesis, anti-inflammation, memory enhancement, and anti-sepsis (Jung et Jung et al., 2009; Kang and Kim, 2007; Song et al., 2011). Dosage dose was determined based on the sum of D and DA contents (Piao et al., 2015).

Each formulation was orally administered to male SD rats (Sprague-Dawley rats, weight 250 ± 5 g, Orient Biosar, Seongnam, Korea), and the in vivo pharmacokinetic characteristics of DO and D, a major metabolite of DA, were evaluated.

Intramedic polyethylene polyethylene (PE-50; Becton Dickinson Diagnostics, MD, USA) was intraperitoneally injected into the left femoral artery of rats under anesthesia with intramuscular injection of zoletil (50 mg / kg dose, Virbac, Carros, France) . The ethanol extract of Angelica giganta or Angelica gigantosa extract-containing microemulsion suspended in DW was orally administered at a dose corresponding to 50 mg / kg ethanol extract of Angelica gigas. The D and DA contents in the ethanol extract of Angelica gigas were analyzed by the LC-MS / MS method to calculate the dose. A certain volume of blood (200 μl) was drawn from the femoral artery at a given time (5, 15, 30, 60, 120, 240, 480, and 720 minutes) and the same volume of physiological saline (20 U / ml heparin) Blood samples were centrifuged at 16,000 rpm for 3 minutes at 4 ° C and a supernatant of 70 μL was stored at -70 ° C until quantitative analysis.

The plasma DOH concentration was measured by the LC-MS / MS system and the known method (Piao et al., 2015). 5 μL of Lactan solution (Losartan, LST, internal standard, 10 μg / mL) and acetonitrile (95 μL) were added to 50 μL of the plasma sample and stirred for 5 minutes. After 5 minutes of centrifugation at 16,000 rpm, an aliquot (5 μL) of the supernatant was loaded onto an HPLC system (Agilent Technologies 1260 Infinity HPLC, Agilent Technologies) and an LC / MS system (Agilent Technologies 6430 Triple Quad LC / MS system) LC-MS / MS system. The setting conditions of the LC and MS portions of the DOH analysis are as described above. The fragmentation transition, fragmentation voltage, and impact energy of the LST (IS) analysis were 207.3, 115 V, and 20 eV at m / z 423.4, respectively. The retention time of the LST under the above conditions was 0.47 minutes. Data processing for LST quantitative analysis was performed with the corresponding program (MassHunter Workstation Software Quantitative Analysis, Version B.05.00; Agilent Technologies). The linearity was observed at the DOH concentration range of 2-10,000 ng / ml, and the precision and accuracy of D and DA were within the acceptable range.

The maximum concentration, C _max , of the DOH concentration-time curve, from the starting point to infinity, was calculated from the total area under plasma DOH concentration-time curve ), And the time of maximum concentration observed (T _max ) were calculated by WinNonlin (Version 3.1, Pharsight, Mountain View, CA, USA).

The results of evaluating the oral absorption of Angelicae gigantis extract-containing formulations in rats by measuring the concentration of DOH in plasma as described above are shown in Fig. 5 and Table 3 below.

parameter Angelica ethanol extract F1 F2 C _max (ng / ml) 188.80 ± 89.67 ^* 389.30 ± 166.04 ^* 793.55 占 108.11 ^* T _max (min) 60 (15-120) 120 (60-120) 120 (120-240) AUC (μg · min / ml) 47.44 ± 10.73 ^* 84.35 + 16.31 ^* 185.75 ± 36.56 ^* F _rel (%) 100 178 392 * P < 0.05, each value is different from each other.
Capacity 50 mg / kg (corresponds to the amount of Angelica gigantea extract).
Data are presented as means ± SD (n = 4).

As shown in Table 3, the mean AUC of the DOH of the F1 and F2 groups was 1.78 times and 3.92 times higher than the ethanol extract of Angelica gigas (P <0.05) (also indicated as the F _rel value). In addition, the C _max values of the F1 and F2 groups were significantly higher than the ethanol extract of Angelica gigas (P <0.05). The increase in solubility and release of D and DA in the microemulsion formulations appears to have resulted in an increase in oral absorption compared to the ethanol extract of Angelica gigas. In particular, the F _rel of the F2 group was 2.20 times higher than that of the F1 group, and the C _max of the F2 group was significantly higher than that of the F1 group (P <0.05). Thus, the TPGS in the F2 group did not affect the release of D and DA, but significantly increased drug absorption in the intestinal mucosa Able to know. Further studies on the role of TPGS in the transport of D and DA in intestinal tract may be necessary, but the absorption enhancement effect of TPGS will be useful for the development of oral microemulsion formulations of Angelica gigas.

Claims (11)

Herbal extract; And
Microemulsions containing omega-3 unsaturated fatty acids, surfactants and water
&Lt; / RTI &gt; The microemulsion composition of claim 1, further comprising D-alpha-tocopherol polyethylene glycol 1000 succinate. The microemulsion composition according to claim 2, wherein the D-alpha-tocopherol polyethylene glycol 1000 succinate is contained in an amount of 0.005 to 2% (w / v) based on the total amount of the microemulsion composition. 4. The method according to any one of claims 1 to 3, wherein the herbal medicine is at least one selected from the group consisting of Angelica gigas Nakai, Angelica gigas Nakai and Chinese Angelica gigas; Purkinje; curcuma; rhubarb; Schisandra; Ginseng; dermis; And gold. &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt; 4. The method according to any one of claims 1 to 3, wherein the herbal extract is a hot water; Alcohols consisting of methanol, ethanol, isopropanol and butanol; ether; Ethyl acetate; Acetone; Wherein the extract is a herbal medicine extract which is extracted with at least one solvent selected from the group consisting of methylene chloride and methylene chloride or extracted with at least one extraction method selected from the group consisting of high frequency extraction method, extrusion melting method and supercritical extraction method. 4. The microemulsion composition according to any one of claims 1 to 3, wherein the herbal medicine extract is contained in an amount of 0.01 to 5% (w / v) based on the total amount of the microemulsion composition. 4. The microcapsule according to any one of claims 1 to 3, wherein the omega-3 unsaturated fatty acid is at least one selected from the group consisting of? -Linolenic acid, eicosapentaenoic acid and docosahexaenoic acid. Emulsion composition. 4. The composition according to any one of claims 1 to 3, wherein the surfactant is one selected from the group consisting of caprylocaproylmacroline-8 glyceride, caprylocaproylpolyoxyl-8 glyceride, and combinations thereof. Lt; RTI ID = 0.0 &gt; microemulsion &lt; / RTI &gt; 4. The microemulsion as claimed in any one of claims 1 to 3, wherein the microemulsion comprises 1 to 25% by weight of omega-3 unsaturated fatty acids, 25 to 80% by weight of a surfactant and 5 to 70% &Lt; RTI ID = 0.0 &gt; microemulsion &lt; / RTI &gt; composition. (a) mixing the omega-3 unsaturated fatty acid and the surfactant to prepare a mixture;
(b) adding water to the mixture prepared in step (a) to prepare a microemulsion; And
(c) dissolving the herbal extract in the microemulsion prepared in step (b)
&Lt; / RTI &gt; 11. The method of claim 10, wherein D-alpha -tocopherol polyethylene glycol 1000 succinate is further mixed in step (c).

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