CN114644675B - Method for separating Luo Pancao glycoside B from holly bark - Google Patents

Abstract

The invention discloses a method for separating Luo Pancao glycoside B from holly bark, which comprises the following steps: soaking cortex Ilicis Rotundae in ethanol and water sequentially, mixing filtrates, and concentrating to obtain extract; extracting, concentrating and drying the extract; dissolving the extract, loading the extract into macroporous adsorption resin for gradient elution to obtain four fractions; and (3) sequentially loading target fractions in the four fractions on a chromatographic column I, a chromatographic column II and a chromatographic column III, performing gradient elution, respectively dropping the obtained samples on a thin layer plate, and respectively collecting the fractions I, II and III according to the ratio shift value, wherein the fraction III is the compass grass glycoside B. The invention can separate the rotundiside B from the holly bark, provides reference basis for the basic research of the material of the holly bark, the bacteriostasis mechanism of the bacteriostasis part and the clinical application research, and opens up a new path for the preparation source of the rotundiside B.

Description

Method for separating Luo Pancao glycoside B from holly bark

Technical Field

The invention belongs to the technical field of Chinese herbal medicine separation and extraction, and particularly relates to a method for separating Luo Pancao glycoside B from holly bark.

Background

Cortex Ilicis Rotundae is dry bark of ilex rotunda Ilex rotunda Thunb of ilex of iledaceae, mainly produced in two wide areas, and is obtained by peeling trunk of ilex rotunda in summer and autumn, removing impurities, cleaning, moistening, slicing, and sun drying. It is bitter in nature and cold in nature and enters lung, stomach, large intestine and liver meridians. Has effects of clearing heat and detoxicating, promoting diuresis, and relieving pain, and can be used for treating common cold, fever, tonsillitis, laryngopharynx swelling and pain, acute and chronic pharyngitis, gastric ulcer, duodenal ulcer, rheumatalgia, traumatic injury, and scald due to water and fire.

With the intensive research of the Chinese medicine holly bark in recent years, the chemical components of the Chinese medicine holly bark are also separated, and the Chinese medicine holly bark can be roughly classified into triterpenes, phenolic glycosides, flavonoids, aromatic compounds, steroids, aldehydes and the like.

The triterpene compounds separated from the cortex rotundae officinalis are mainly as follows: oleanolic acid (3-O-acetyloleanolic acid), 19 alpha-dihydroxyurs-12-en-3-one-28-oic acid,3β,19 α -dihydroacids-12-en-24, 28-dioic acid, friedel, 28-hydroxy-friedel, 3-hydroxy-oleanane (3β -OH-olerane), iron-wintergreen acid (rotundaic acid), iron-wintergreen acid isopropylidene ketal (Rotundic acid isopropylidene), long-ridged ileside (peductuloside), 3-O- α -L-rhamnofuranose- (1→2) - β -D-glucopyranoside 1- (1→2) - β -D-arabinopyranosyl ilexgenin B-O- β -D-glucopyranoside 1ester, 3-O- [ α -L-rhamnofuranose 1- (1→2) - β -D-glucopyranoside 1] -3β -D-glucopyranoside 1-1, 19 α -D-12-hydroxy-12-D-glucopyranoside-28-O-pyro 1-furanone.

The aromatic compounds separated from the holly bark are most representative in the fifties of the twentieth century, the holly bark glycoside A of sugar ligand is separated from the holly bark, namely, later discovered Syringin (Syringin) is separated from the acetone extract of dry coarse powder ethanol extract of the holly bark in the nineties, sinapid glucoside (Sinapaldehyde glucoside) is separated from the acetone extract of the dry coarse powder ethanol extract of the holly bark, and two phenolic compounds are separated from the holly bark medicinal material, namely, holly bark alcohol (rotundaol) and novel compound Syringin ether (Disyringin ether). Other aromatic compounds found in holly bark include sinapaldehyde, syringaldehyde, caffeic acid 4-O-beta-D-glucopyranoside, vanillic acid 4-O-beta-D-glucopyranoside, diisobutyl phthalate (Di-isobutyl phthalate), phloroglucinol, cis-methyl isoeugenol (Cis-methyl. Isoeugenol), and the like.

Studies show that two lignin compounds, namely, the eugenol 4' -O-beta-D-glucopyranoside and the syringaresinol 4', 4' -O-beta-D-glucopyranoside, are separated from the cortex rotundae officinalis medicinal material.

In addition to the above-mentioned types of compounds, the holly bark also contains steroid compounds: beta-sitosterol (beta-sitosterol), beta-daucosterol (beta-daucosterol) and fatty acid compounds: stearic acid (stearic acid), nonadecanoic acid (nonadecylic acid), glucose (Glucose), inositol (inonitol), melitracin (mellin), palmitic acid (Hexadecanoic acid), methyl 9, 12-octadecadienoate (9, 12-Octadecadienoic acid methyl ester), and the like.

At present, researches show that the ethanol extract and the water extract of the holly bark have stronger inhibition effect on staphylococcus aureus and beta-hemolytic streptococcus; the ethanol extraction part of the holly bark can effectively inhibit the mouse ear swelling induced by dimethylbenzene, which shows that the holly bark has remarkable anti-inflammatory effect. The holly total flavonoids extracted by soaking in 60% ethanol solution have antibacterial effects on escherichia coli (MIC=80 mg/mL), streptococcus (MIC=80 mg/mL), pseudomonas aeruginosa (MIC=80 mg/mL), enterococcus faecalis (MIC=40 mg/mL), proteus vulgaris (MIC=40 mg/mL), staphylococcus aureus (MIC=20 mg/mL) and Acinetobacter baumannii (MIC=10 mg/mL). Researches show that after the dry product and the wet product of the holly bark are respectively soaked and extracted, the extracting solution is respectively acted on escherichia coli, typhoid bacillus and staphylococcus aureus, and the result shows that the antibacterial effect of the fresh product extracting solution is superior to that of the dry product extracting solution. In the aspect of the study of the bacteriostasis mechanism of the holly bark, the holly bark total flavone and the holly bark aqueous extract are respectively found to increase the cell wall and cell membrane permeability of ESBLs-producing escherichia coli, reduce the DNA synthesis amount, increase the apoptosis proportion and reduce the total protein synthesis, and the studies initially disclose the bacteriostasis mechanism of the holly bark extract. Regarding the research aspect of anti-inflammatory mechanism, the extract of the holly bark extracted and purified by the optimal process can obviously inhibit the activity of glutamic-oxaloacetic transaminase (AST) and glutamic-pyruvic transaminase (ALT) in the serum of mice, can obviously inhibit the generation of Malondialdehyde (MDA), and can reduce the expression quantity of the key enzyme cyclooxygenase-2 of inflammatory mediators, so that the synthesis quantity of the inflammatory mediators is reduced to play an anti-inflammatory role. In addition, the component rotendene in the holly bark has been found to inhibit the activity of TLR-2 in the Akt and NF- κB pathways to reduce the production of inflammatory mediators, i.e. active oxygen, in keratinocytes, thereby exerting anti-inflammatory effect.

Because the chemical components of the holly bark are very complex, the separation method of each compound is also complex, more compound components which are not separated and identified still exist so far, the bacteriostasis mechanism and the bacteriostasis components of the holly bark are not completely disclosed, and no related report on the separation of the rotundiside B from the holly bark is seen.

Disclosure of Invention

Aiming at the problems, the invention provides a method for separating Luo Pancao glycoside B from holly bark, which can separate the rotundiside B from the holly bark and provides reference for the basic research of the holly bark, the bacteriostasis mechanism of the bacteriostasis part and the clinical application research.

The technical scheme of the invention is as follows:

a method for separating Luo Pancao glycoside B from holly bark, comprising the following steps:

s1: soaking cortex Ilicis Rotundae in 75-85% ethanol solution, extracting at normal temperature for 2-4 days, filtering to obtain residue, soaking in 45-55% ethanol solution, extracting at normal temperature for 2-4 days, filtering again to obtain residue, soaking in purified water, extracting at normal temperature for 2-4 days, mixing the three filtrates, and concentrating to obtain extract;

s2: sequentially extracting the extract with petroleum ether, ethyl acetate, n-butanol and water, concentrating and drying each extract layer;

s3: dissolving the extract of the water extractant layer in water, loading the water extractant layer into macroporous adsorption resin, and performing gradient elution to obtain four fractions;

s4: dissolving target fractions in water, loading the target fractions into a chromatographic column I for chromatographic separation, spotting the obtained sample on a thin-layer plate, and collecting the fraction I;

s5: dissolving the fraction I, loading the solution into a chromatographic column II, performing gradient elution, spotting the obtained sample on a thin-layer plate, and collecting the fraction II; loading fraction II onto chromatographic column III, gradient eluting, spotting the obtained sample on a thin layer plate, and collecting fraction III to obtain herba Oenotherae Erythrosepalae glycoside B.

In step S3, the macroporous adsorbent resin uses 0-90% methanol solution as eluent, and 30% is a gradient.

Further, in the step S4, the target fraction is a fraction eluted with 60% methanol solution.

In step S4, the chromatographic column i is an MCI chromatographic column, and pure water is used as an eluent.

Further, the fraction I is a fraction with a specific shift value of 0.26-0.70 in a 20% methanol solution eluent.

In step S5, the chromatographic column ii is an MCI chromatographic column, and 0-100% methanol solution is used as eluent, and 10% is a gradient.

Further, the fraction II is a fraction with a specific shift value of 0.17-0.30 in 40-60% methanol solution eluent.

In step S5, the chromatographic column III is a HW-40F chromatographic column, 30-90% methanol solution is adopted as eluent, and 10% is a gradient.

Further, the fraction III is a fraction with a specific shift value of 0.44 in 30% methanol solution eluent.

The concept of the shift value described herein is: the ratio of the distance from the center of the compound spot to the origin to the distance from the solvent front to the origin is the specific shift value of the compound. After the unfolding separation, the position of the compound on the lamina plate is expressed in terms of specific shift value (Rf value).

The percentage content of the solutions described herein are all volume percentages.

The beneficial effects of the invention are as follows:

1. the invention can confirm the antibacterial position of the holly bark, sequentially extract the different polar positions of the holly bark by using petroleum ether, ethyl acetate, n-butyl alcohol and water, separate the water extraction layer by chromatography through macroporous adsorption resin, and combine the multi-time chromatography analysis and spot plate operation by selecting proper chromatographic columns, thereby separating the rotundiside B from the water extraction layer, providing a reference basis for the material foundation research of the holly bark, the antibacterial mechanism of the antibacterial position and the clinical application research, and opening up a new path for the preparation source of the rotundiside B.

2. The present invention identified the isolated Luo Pancao glycoside B, as shown in example 4, to define its structure, confirming that it is indeed Luo Pancao glycoside B; the antibacterial test was also performed on extracts of different polarity portions of holly bark, and as shown in example 5, it was confirmed that antibacterial components were located in the water extraction layer, and that the compass grass glycoside B was located in 60% methanol eluent of the water extraction layer, which also had antibacterial activity, and that the compass grass glycoside B was located in the antibacterial components.

3. The invention has simple operation, better continuity, stability and universality, can be suitable for separating and extracting various compounds, and has good separating effect, mild condition and low cost.

Detailed Description

The present invention will be described in detail with reference to the following examples.

Example 1

A method for separating Luo Pancao glycoside B from holly bark, comprising the following steps:

s1: soaking cortex Ilicis Rotundae in 75% ethanol solution, extracting at normal temperature for 2 days, filtering to obtain residue, soaking in 45% ethanol solution, extracting at normal temperature for 2 days, filtering again to obtain residue, soaking in purified water, extracting at normal temperature for 2 days, mixing the three filtrates, and concentrating to obtain extract;

s2: sequentially extracting the extract with petroleum ether, ethyl acetate, n-butanol and water, concentrating and drying each extract layer;

s3: dissolving the extract of the water extraction layer in water, loading the water extract into macroporous adsorption resin, and carrying out gradient elution by using 0-90% methanol solution, wherein 30% is a gradient, so as to obtain four fractions;

s4: dissolving the fraction eluted by 60% methanol solution in the gradient elution into water, loading the solution into an MCI chromatographic column, carrying out gradient elution by adopting 10% -100% methanol solution, wherein 10% is a gradient, spotting a sample eluted by 20% methanol solution on a thin-layer plate, and collecting fraction I with a specific shift value of 0.26-0.70;

s5: dissolving the fraction I, loading the solution into an MCI chromatographic column, performing gradient elution by adopting 0-100% methanol solution, wherein 10% is a gradient, spotting a sample obtained by eluting with 40-60% methanol solution on a thin layer plate, and collecting a fraction II with a specific shift value of 0.17-0.30; loading the fraction II into HW-40F chromatographic column, gradient eluting with 30-90% methanol solution, wherein 10% is a gradient, spotting the sample obtained by eluting with 30% methanol solution on a thin layer plate, and collecting fraction III with specific shift value of 0.44 to obtain the final product.

Example 2

A method for separating Luo Pancao glycoside B from holly bark, comprising the following steps:

s1: soaking cortex Ilicis Rotundae in 80% ethanol solution, extracting at normal temperature for 3 days, filtering to obtain residue, soaking in 50% ethanol solution, extracting at normal temperature for 3 days, filtering again to obtain residue, soaking in purified water, extracting at normal temperature for 3 days, mixing the three filtrates, and concentrating to obtain extract;

s2 to S5 are the same as in example 1.

Example 3

A method for separating Luo Pancao glycoside B from holly bark, comprising the following steps:

s1: soaking cortex Ilicis Rotundae in 85% ethanol solution, extracting at normal temperature for 4 days, filtering to obtain residue, soaking in 55% ethanol solution, extracting at normal temperature for 4 days, filtering again to obtain residue, soaking in purified water, extracting at normal temperature for 4 days, mixing the three filtrates, and concentrating to obtain extract;

s2 to S5 are the same as in example 1.

Example 4 identification experiment

The structure of the isolated compass glycosides B of examples 1-3 was determined by physicochemical properties and spectroscopic characteristics.

The identification shows that the isolated compass glycosides B in examples 1-3 are light yellow powder, have cluster peaks between delta H0.60-1.50, contain 7 methyl proton signals, and are 1.26,1.09,0.92,0.90,0.88,0.87,0.82 from low field to high field respectively, which suggests that the compounds may be sterols or terpenoids. Hydrogen spectrum data δ:5.42 (1 h, s, h-1 '), 6.33 (1 h, d, j=8.0 hz, h-1'), carbon spectrum data δ:106.2 (C-1 '), 77.3 (C-2'), 78.2 (C-3 '), 72.0 (C-4'), 78.5 (C-5 '), 63.0 (C-6'), 96.1 (C-1 "), 74.4 (C-2"), 79.1 (C-3 "), 71.4 (C-4"), 79.6 (C-5 "), 62.5 (C-6") indicate that the structure contains two sets of sugar segments, and the carbon spectrum data shows 1 carboxyl carbon signal delta 176.7,1 versus carbon-carbon double bond signals delta 123.2 and delta 144.4.1H NMR (500 MHz, pyr) δ:5.70 (1 h, s, h-12), 6.33 (1 h, d, j=8.0 hz, h-1', C-28), 5.42 (1 h, s, h-1', C-3), 1.26 (3 h, s), 1.09 (3 h, s), 0.92 (3 h, s), 0.90 (3 h, s), 0.88 (3 h, s), 0.87 (3 h, s), 0.82 (3 h, s). 13C NMR (125 MHz, pyr) δ:37.2 (C-1), 26.8 (C-2), 40.1 (C-4), 19.8 (C-6), 34.3 (C-7), 39.8 (C-8), 48.2 (C-9), 36.0 (C-10), 24.0 (C-11), 123.2 (C-12), 144.4 (C-13), 42.4 (C-14), 28.5 (C-15), 23.7 (C-16), 47.3 (C-17), 42.0 (C-18), 46.5 (C-19), 31.0 (C-20), 33.4 (C-21), 32.8 (C-22), 17.4 (C-24), 15.8 (C-25), 17.7 (C-26), 176.4 (C-27), 176.7 (C-28), 23.9 (C-29), and 42.0 (C-3) (C-3, C-18), 46.4 (C-3) and 32.8 (C-23) and 28 (C-3 ) (C-3, C-7'), 28 (C-3, C-2) and 3 (C-3 ) 2 (C-3). 79.1 (C-3 '), 71 (C-4'), 79 (C-5 '), 62 (C-6'). The above data are consistent with the literature "Zhang Y, peng Y, li L, et al Studies on cytotoxic triterpene saponins from the leaves of Aralia elata [ J ]. Food Chem,2013,138 (1): 208-213 ], and therefore identify the compound as being the first isolated from the plant, having the structure

Determination experiment of antibacterial Activity of antibacterial portion of cortex Ilicis Rotundae

1. Experimental method

The bacteriostatic activity of the fluid is measured by using multi-drug resistant escherichia coli as a test bacterium, and the fluid is tested by a double micro dilution method, and the operation method and the result judgment are described with reference to CLSI.

2. Preparation of samples

Experiment group 1: under the aseptic condition, dissolving each extraction layer in the step S2 in the example 2 by using 5% DMSO and sterilized water to prepare mother solutions with the concentration of 1g/mL respectively;

experiment group 2: under the aseptic condition, dissolving the four fractions eluted by the macroporous adsorption resin in the step S3 in the example 2 by using 5% DMSO and sterilized water to prepare mother solutions with the concentration of 80mg/mL respectively;

blank control: sterilized water containing 5% dmso.

3. Preparation of E.coli suspension

Under aseptic condition, inoculating Escherichia coli colony on Maiconkai agar medium with inoculating loop, transferring into NB broth, culturing at 37deg.C and 220rpm for 2-6 hr, regulating bacterial solution to 0.5 Maiconjoint turbidity with sterile NB broth, and diluting the bacterial solution at 1:1000 to obtain bacterial concentration of about 10 ⁵ CFU/mL, the diluted bacterial liquid is used immediately.

4. Experimental results

(1) The results of the bacteriostasis measurement of the different polarity portions of the holly bark in the step S2 in the example 2 are shown in the table 1.

TABLE 1 minimum inhibitory concentration of different polarity portions of cortex Ilicis Rotundae

Different polarity portions	Blank space	Petroleum ether layer	Ethyl acetate layer	N-butanol layer	Aqueous layer
						MIC	+	+	+	+	0.5(g/mL)

Note that: "+" indicates no antibacterial effect.

As is clear from Table 1, only the aqueous layer had an inhibitory effect on multi-drug resistant E.coli, and the petroleum ether layer, the ethyl acetate layer and the n-butanol layer had no inhibitory effect on multi-drug resistant E.coli.

(2) The results of the bacteriostasis measurement of each fraction of the water extract layer of holly bark in the embodiment 2 of the invention are shown in table 2.

TABLE 2 minimum inhibitory concentration of the various fractions of the water extract layer of holly bark

Fluid fraction	Blank space	0% methanol eluent	30% methanol eluent	60% methanol eluent	90% methanol eluent
						MIC	+	+	+	40(mg/mL)	+

Note that: "+" indicates no antibacterial effect

As is clear from Table 1, the fractions eluted with 60% methanol had an inhibitory effect on the multi-drug resistant E.coli, and the other fractions had no inhibitory effect on the multi-drug resistant E.coli.

Therefore, luo Pancao glycoside B separated and extracted by the method is contained in the water extract layer of the holly bark and 60% methanol eluent of the water extract layer, and the eluent also has antibacterial activity.

Claims (1)

1. A method for separating Luo Pancao glycoside B from holly bark, which is characterized by comprising the following steps:

s1: soaking cortex Ilicis Rotundae in 75-85% ethanol solution, extracting at normal temperature for 2-4 days, filtering to obtain residue, soaking in 45-55% ethanol solution, extracting at normal temperature for 2-4 days, filtering again to obtain residue, soaking in purified water, extracting at normal temperature for 2-4 days, mixing the three filtrates, and concentrating to obtain extract;

s2: sequentially extracting the extract with petroleum ether, ethyl acetate, n-butanol and water, concentrating and drying each extract layer;

s3: dissolving the extract of the water extraction layer in water, loading the water extract into macroporous adsorption resin, and performing gradient elution to obtain four fractions;

s4: dissolving target fractions in water, loading the target fractions into a chromatographic column I, performing chromatographic separation, spotting the obtained sample on a thin-layer plate, and collecting the fraction I;

s5: dissolving the fraction I, loading the solution into a chromatographic column II, performing gradient elution, spotting the obtained sample on a thin-layer plate, and collecting the fraction II; loading the fraction II on a chromatographic column III, performing gradient elution, spotting the obtained sample on a thin layer plate, and collecting the fraction III to obtain the corset B;

in the step S3, the macroporous adsorption resin adopts 0-90% methanol solution as eluent, and 30% is a gradient;

in the step S4, the target fraction is a fraction eluted by 60% methanol solution;

in the step S4, the chromatographic column I is an MCI chromatographic column, and pure water is adopted as eluent;

the fraction I is the fraction with the specific shift value of 0.26-0.70 in the water eluent;

in the step S5, the chromatographic column II is an MCI chromatographic column, 0-100% methanol solution is adopted as eluent, and 10% is a gradient;

the fraction II is a fraction with the specific shift value between 0.17 and 0.30 in 40-60% methanol solution eluent;

in the step S5, the chromatographic column III is a HW-40F chromatographic column, 30-90% methanol solution is adopted as eluent, and 10% is a gradient;

the fraction III is a fraction with a specific shift value of 0.44 in 30% methanol solution eluent.