CN107162891B - Naphthalene compound extracted from lavender and preparation method and application thereof - Google Patents
Naphthalene compound extracted from lavender and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C49/00—Ketones; Ketenes; Dimeric ketenes; Ketonic chelates
- C07C49/20—Unsaturated compounds containing keto groups bound to acyclic carbon atoms
- C07C49/258—Unsaturated compounds containing keto groups bound to acyclic carbon atoms containing —CHO groups
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
- A24B15/18—Treatment of tobacco products or tobacco substitutes
- A24B15/28—Treatment of tobacco products or tobacco substitutes by chemical substances
- A24B15/30—Treatment of tobacco products or tobacco substitutes by chemical substances by organic substances
- A24B15/302—Treatment of tobacco products or tobacco substitutes by chemical substances by organic substances by natural substances obtained from animals or plants
- A24B15/303—Plant extracts other than tobacco
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/78—Separation; Purification; Stabilisation; Use of additives
Abstract
The invention discloses a naphthalene compound extracted from lavender and a preparation method and application thereof. The compound was named: 5-methoxy-2-methyl-7- (3-methyl-2-oxo-3-vinyl) -1-naphthaldehyde. The compound is obtained by taking lavender which is a spice plant as a raw material, extracting the raw material by using an organic solvent to obtain an extract, and separating and purifying the extract by using silica gel column chromatography and high-pressure liquid chromatography. The compound is nontoxic to animals, safe to use and good in antibacterial activity, and has an antibacterial rate of over 93.4% for escherichia coli, staphylococcus aureus and the like. The compound is used for quality guarantee of tobacco material liquid, can effectively inhibit the growth of microorganisms in the material liquid, and prolongs the quality guarantee period of the tobacco material liquid.
Description
Technical Field
The invention belongs to the field of natural product chemistry, and particularly relates to a naphthalene compound extracted from lavender which is a traditional spice plant for the first time. Meanwhile, the invention also relates to a preparation method of the compound and application of the compound in inhibiting deterioration of tobacco feed liquid.
Background
Lavender is a plant of Lavender genus of Labiatae family, widely distributed in Atlantic Islands and Mediterranean region to Somali, Pakistan and India; only 2 plants are cultivated in China. The plant is half shrub or shrub, and is diluted into herb. Culturable varieties are widely cultivated in cultivation gardens around the world. Lavender is a long-standing spice plant, and has been used for bathing, perfuming, repelling insects, and removing dirt since ancient times. The essential oil distilled from the lavender spica is fragrant and fragrant, and has multiple purposes.
The lavender whole plant contains 1-3% of volatile oil, the lavender essential oil is a complex mixture composed of a plurality of different types of aromatic compounds, and has more than 30 components, and the main components comprise linalool, linalyl acetate, eucalyptol, B-roxilene (including cis and trans) pairs, lavender ester acetate, lavender alcohol, terpene-4-alcohol, camphor and the like. In addition, the product also contains active nonvolatile components such as flavone, terpenes, and lactone.
The natural preservative is also called as natural organic preservative, is obtained by artificially extracting or processing substances which are secreted by organisms or exist in vivo and have bacteriostatic action. The preservative is a natural substance, and some preservatives are components of food, so the preservative is harmless to human bodies and can improve the flavor quality of the food, thereby being a food preservative with development prospect. With the increasing focus of people on food safety and health care functions, the selection of food raw materials and food additives tends to natural, healthy and bioactive materials, natural plants become important sources of food antiseptic and antibacterial components, natural substance resources which can be used for development of the antiseptic and the preservative are very wide, and the structure types are mainly as follows: flavones, tannins, anthraquinones, alkaloids, lignans, terpenoids, sterols, and the like.
The invention separates a new naphthalene compound from lavender for the first time, the compound is safe and nontoxic, the antibacterial activity is obvious, and related reports are not seen in the prior art.
Disclosure of Invention
The invention aims to provide a novel naphthalene compound.
Another object of the present invention is to provide a method for preparing the naphthalene compound.
The invention also aims to provide the application of the naphthalene compound in inhibiting the deterioration of tobacco feed liquid.
The purpose of the invention is realized by the following technical scheme.
All percentages used herein are by weight unless otherwise indicated.
A naphthalene compound is extracted and separated from Lavender, and has the following structural formula:
the compound was named: 5-methoxy-2-methyl-7- (3-methyl-2-oxo-3-vinyl) -1-naphthaldehyde; the English name is:
5-methoxy-2-methyl-7-(3-methyl-2-oxobut-3-enyl)-1-naphthaldehyde。
a method for preparing the naphthalene compound, comprising the steps of:
(1) extracting the extractum: crushing lavender to 30-50 meshes, extracting for 3-5 times by using 80-100 wt% of methanol or ethanol or 60-90 wt% of acetone as an extraction solvent, wherein the volume of the extraction solvent is 2-5 times that of the lavender, combining the extracting solutions, filtering and concentrating to obtain a flowable viscous extract;
(2) silica gel column chromatography: the extractum is subjected to silica gel column chromatography by using a 160-300-mesh silica gel dry method in an amount which is 2-4 times the weight of the extractum; performing gradient elution with chloroform-acetone solution at volume ratio of 1:0, 20:1, 9:1, 8:2, 7:3, 6:4, 1:1 and 1:2, mixing the same parts, collecting eluate of each part, and concentrating;
(3) high-pressure liquid chromatography separation and purification: concentrating the eluate eluted by chloroform-acetone at a ratio of 8:2 to dry, dissolving with pure methanol, further separating and purifying by high pressure liquid chromatography, detecting with ultraviolet detector at wavelength of 346nm, collecting chromatographic peak of 31.6min, accumulating for multiple times, and evaporating to dryness to obtain the naphthalene compound.
Further, in the step (1), the lavender is crushed into 30 meshes; the weight ratio of the extraction solvent to the lavender is (3-4): 1, soaking for 24-72h and then extracting.
In the step (2), before the crude separation of the extract by silica gel column chromatography, the extract is dissolved by pure methanol or pure ethanol or pure acetone with the weight ratio of 1.5-3 times, then the sample is mixed by 80-100 meshes of silica gel with the weight ratio of 0.8-1.2 times of the extract, and then the silica gel column chromatography is carried out by filling 160 meshes of silica gel with the weight ratio of 1-10 times of the extract into the column.
In the step (3), the high pressure liquid chromatography separation and purification adopts C with the size of 21.2mm multiplied by 250mm and 5 mu m18And (3) carrying out chromatographic column chromatography, wherein the flow rate is 20mL/min, the mobile phase is 66% methanol, the detection wavelength of an ultraviolet detector is 346nm, 200 mu L of sample is fed every time, collecting chromatographic peaks of 31.6min, and evaporating to dryness after multiple accumulation.
In the step (3), the compound obtained after the separation and purification by the high pressure liquid chromatography is firstly dissolved by pure methanol, and then the pure methanol is taken as a mobile phase, and is separated by gel column chromatography for further separation and purification.
The naphthalene compound has the functions of inhibiting the decay and the deterioration of the tobacco material liquid and prolonging the quality guarantee period of the tobacco material liquid.
Compared with the prior art, the invention has the following outstanding advantages:
the compound is separated from the traditional perfume plant lavender, is non-toxic to animals, is safe to use, shows good antibacterial activity, and has the antibacterial rate of over 93.4 percent on escherichia coli, staphylococcus aureus and the like; as a bacteriostatic agent for the tobacco material liquid, the quality guarantee period of the tobacco material liquid can be obviously prolonged. And the compound has simple structure, and the process is easy to realize if artificial synthesis is adopted, and the production cost is low.
Drawings
FIG. 1 is a nuclear magnetic resonance carbon spectrum of a naphthalene compound of the present invention;
FIG. 2 is a nuclear magnetic resonance hydrogen spectrum of a naphthalene compound of the present invention;
FIG. 3 is a graph relating the main HMBC of the naphthalene compounds of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available by purchase.
The lavender raw material used in the invention is not limited by regions and varieties, and the invention can be realized.
EXAMPLE 1 preparation of the Compounds
The lavender sample is from Yunnan Kunming. Sampling 2.0kg of crushed lavender with 30 meshes, extracting with 95% methanol for 5 times, extracting for 24h each time, combining the extracting solutions, filtering, and concentrating under reduced pressure to obtain an extract 105 g. Dissolving the extract with 2.0 times of pure methanol by weight, mixing with 120g of 100 mesh crude silica gel, loading 0.6kg of 160 mesh silica gel into a column, performing silica gel column chromatography, performing gradient elution with chloroform-acetone in volume ratio of 1:0, 20:1, 9:1, 8:2, 7:3, 6:4, 1:1 and 1:2, monitoring by TLC, and combining the same parts to obtain 8 parts, wherein the chloroform-acetone eluted part in volume ratio of 8:2 is separated by using an Agilent 1100 semi-preparative high performance liquid chromatography, 66% methanol is used as a mobile phase, a Zorbax SB-C18(21.2 × 250mm,5 μm) preparation column is used as a stationary phase, the flow rate is 20ml/min, the wavelength is 346nm detected by an ultraviolet detector, 200 μ L of sample is injected each time, collecting a chromatographic peak of 31.6min, and evaporating to dryness after multiple accumulation; and dissolving the obtained product with pure methanol again, taking the pure methanol as a mobile phase, and carrying out Sephadex LH-20 gel column chromatography separation to obtain the naphthalene compound.
EXAMPLE 2 preparation of the Compounds
The lavender sample is from Xinjiang Kashi, 3.5kg of the lavender sample crushed to 40 meshes is sampled, extracted for 4 times by 95% ethanol for 48 hours each time, the extracting solutions are combined, filtered and concentrated under reduced pressure to obtain 250g of extract. Dissolving the extract with 2.0 times of pure methanol by weight, mixing with 250g of 80-mesh crude silica gel, loading 1.2kg of 200-mesh silica gel into a column, performing silica gel column chromatography, performing gradient elution with chloroform-acetone in volume ratio of 1:0, 20:1, 9:1, 8:2, 7:3, 6:4, 1:1 and 1:2, monitoring by TLC, and combining the same parts to obtain 8 parts, wherein the chloroform-acetone eluted part in volume ratio of 8:2 is separated by using an Agilent 1100 semi-preparative high performance liquid chromatography, 66% of methanol is used as a mobile phase, a Zorbax SB-C18(21.2 × 250mm,5 μm) preparation column is used as a stationary phase, the flow rate is 20ml/min, the wavelength is 346nm detected by an ultraviolet detector, 200 μ L of sample injection is performed each time, collecting a chromatographic peak of 31.6min, and evaporating to dryness after multiple accumulation; and dissolving the obtained product by using pure methanol again, taking the pure methanol as a mobile phase, and carrying out SephadexLH-20 gel column chromatography separation to obtain the naphthalene compound.
EXAMPLE 3 preparation of the Compounds
The lavender sample is from Sichuan Sichang, 5kg of the lavender sample crushed to 50 meshes is sampled, ultrasonic extraction is carried out for 3 times by 75% of acetone, each time extraction is carried out for 72 hours, the extracting solutions are combined, filtered and concentrated under reduced pressure to obtain 380g of extract. Dissolving the extract with 1.6 times of pure methanol by weight, mixing with 400g of 90 mesh crude silica gel, loading 2.4kg of 180 mesh silica gel into a column, performing silica gel column chromatography, performing gradient elution with chloroform-acetone in volume ratio of 1:0, 20:1, 9:1, 8:2, 7:3, 6:4, 1:1 and 1:2, monitoring by TLC, and combining the same parts to obtain 8 parts, wherein the chloroform-acetone eluted part in volume ratio of 8:2 is separated by using an Agilent 1100 semi-preparative high performance liquid chromatography, 66% of methanol is used as a mobile phase, a Zorbax SB-C18(21.2 × 250mm,5 μm) preparation column is used as a stationary phase, the flow rate is 20ml/min, the wavelength is 346nm detected by an ultraviolet detector, 200 μ L of sample injection is performed each time, collecting a chromatographic peak of 31.6min, and evaporating to dryness after multiple accumulation; and dissolving the obtained product with pure methanol again, taking the pure methanol as a mobile phase, and carrying out Sephadex LH-20 gel column chromatography separation to obtain the naphthalene compound.
Example 4 identification of Compound Structure
The structure of the compound prepared in example 1 was determined by the following method; the high resolution mass spectrum HRESIMS (positive ion collection) shows that the peak of the quasi-molecular ion is M/z 305.1147[ M + Na ]]+(calculated 305.1154). As shown in FIGS. 1-2, are combined1H and13c NMR spectra confirmed that the compound has the formula C18H18O3The unsaturation degree was 10. The infrared spectrum shows carbonyl groups (1695 and 1680 cm)-1) And aromatic rings (1585, 1530 and 1422cm-1) The resonance absorption peak of (1). The existence of aromatic ring structures in the compound is confirmed by the maximum absorption of the ultraviolet spectrum at 205, 238 and 346 nm. Process for preparing compounds1H、13C NMR and DEPT data (Table-1) show the presence of 18 carbons and 18 hydrogens in the compound, including 1,2,5, 7-tetrasubstituted naphthalene nucleus (C-1 to C-10; H-3, H-4, H-6 and H-8), one aldehyde group (deltaC191.1d；δH9.98s), 1 methoxy (. delta.) groupC56.4q；δH3.81), 1 methyl group (. delta.))C20.8；δH2.08), and 1 3-methyl-2-oxobutyl-3-vinyl structural fragment (C-3 'to C-7'; h2-3'，H26' and H3-7'). The 1,2,5, 7-tetrasubstituted naphthalene nucleus may be further identified by the HMBC association of H-3 and C-1, C-2, C-4 and C-10, H-4 and C-2, C-3, C-5, C-9 and C-10, H-6 and C-5, C-7, C-8 and C10, and H-8 and C-1, C-6, C-7, C-9 and C-10. Further analysis of its HMBC correlation spectrum, based on methoxyhydrogens (. delta.)H3.81) and C-5 (. delta.)C155.3) may surmise that the methoxy substitution is at the C-5 position of the nucleus of the naphthalene. The C-1 position of the naphthaldehyde group substituted by H-1' (delta)H9.98) and C-1 (. delta.))C125.7)、C-2(δC149.1)、C-9(δC131.3) was confirmed. According to H3-2′(δH2.49) and C-1 (. delta.))C125.7)、C-2(δC149.1)、C-3(δC124.1), and H-3 (delta)H7.55) and C-2' (delta)C20.8) the HMBC presumably substituted with a methyl group at the C-2 position of the naphthalene nucleus. The substitution of 3-methyl-2-oxobutyl-3-vinyl structural fragment at C-7 position of naphthalene mother nucleus can be performed by H2-3′(δH4.51) and C-6 (. delta.))C108.5)、C-7(δC138.4)、C-8(δC116.3)，H-6(δH6.89) and C-3' (delta)C43.7), and H-8 (. delta.))H8.50) and C-3' (delta)C43.7) was confirmed. Typical proton signal H-3 (. delta.) on the benzene ringH7.55，d，J＝8.2)、H-4(δH8.39，d，J＝8.2),H-6(δH6.89, d, J ═ 1.6) and H-8(δ)H8.50, d, J ═ 1.6) also support the above substituent patterns on the naphthalene nucleus. To this end, the structure of the compound was determined and designated as compound: 5-methoxy-2-methyl-7- (3-methyl-2-oxo-3-vinyl) -1-naphthaldehyde; the English name is: 5-methoxy-2-methyl-7- (3-methyl-2-oxout-3-enyl) -1-naphthaldehyde as a red gum, as shown in FIG. 3.
TABLE-1 NMR data for Compound (1) (solvent CDCl)3)
Infrared, ultraviolet and mass spectral data of compounds: UV (methanol), lambdamax(log ε)346(3.72), 238(3.28), 205(4.02) nm; IR (potassium bromide pellet): v ismax3074、2938、2752、1695、1680、1585、1530、1422、1179、1068、854、748cm-1；1H and13c NMR data (500 and 125MHz, (CDCl)3) See Table-1; positive ion mode ESIMS M/z 305[ M + Na ]]+(ii) a Positive ion mode HRESIMS M/z 305.1147[ M + Na ]]+(calculation value C)18H18NaO3，305.1154)。
Example 5 identification of Compound Structure
The compound prepared in example 2 was taken as a red gum. The procedure of the measurement was conducted in the same manner as in example 4, and it was confirmed that the compound prepared in example 2 was the same naphthalene compound, 5-methoxy-2-methyl-7- (3-methyl-2-oxo-3-vinyl) -1-naphthaldehyde.
Example 6 identification of Compound Structure
The compound prepared in example 3 was taken as a red gum. The measurement method was the same as in example 4, and it was confirmed that the compound prepared in example 3 was the same 5-methoxy-2-methyl-7- (3-methyl-2-oxo-3-vinyl) -1-naphthaldehyde.
Example 7 test for antibacterial Activity of Compounds
Any of the naphthalene compounds prepared in examples 1-3 was tested for antibacterial activity as follows:
the in vitro antibacterial experiment is carried out by agar diffusion method, firstly, the tested bacteria are evenly spread on a flat plate of a common agar culture medium (beef extract, peptone, sodium chloride, serum and agar), then, the tablet (the diameter is 5mm) soaked by the compound to be tested (the compound is dissolved by 10mL DMSO and diluted by adding water into 50 mu g/mL solution) is placed on the culture medium with bacteria, and the culture medium is placed in a constant temperature box and incubated for 24-72h at 25 ℃ to observe the size of a bacteriostasis ring. The results show that: the compound has strong activity on staphylococcus aureus, escherichia coli, bacillus subtilis, proteus and the like; the inhibition rate reaches more than 93.4 percent. The compound is subjected to safety evaluation, and is proved to be nontoxic to animals and safe to use through a mouse bone marrow micronucleus experiment, an Ames experiment and a TK gene mutation experiment.
Example 8 Compound application
Any of the naphthalene compounds prepared in examples 1 to 3 was added to the tobacco material solution in an amount of 10. mu.g/mL, 20. mu.g/mL and 50. mu.g/mL, and the sample was allowed to stand for two weeks with the material solution without the added compound as a control to observe the change in microorganisms. The results show that: compared with a control, after the compounds of the invention with the concentration of 10 mug/mL, 20 mug/mL and 50 mug/mL are added, the inhibition rates of the three adding concentrations on the total number of bacteria, coliform group, staphylococcus aureus, pseudomonas aeruginosa, hemolytic streptococcus and the total number of fungi respectively reach: 61.4%, 72.3%, and 83.2%. Because the growth of the microorganism is effectively inhibited, the quality guarantee period of the tobacco feed liquid is greatly prolonged.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A naphthalene compound is extracted and separated from Lavender, and has the following structural formula:
2. a process for preparing the naphthalene compound of claim 1, comprising the steps of:
(1) extracting the extractum: crushing lavender to 30 meshes, using methanol or ethanol with the weight percentage concentration of 80-100% or acetone with the weight percentage concentration of 60-90% as an extraction solvent, wherein the weight ratio of the extraction solvent to the lavender is (3-4): 1, soaking for 24-72h, extracting for 3-5 times, combining the extracting solutions, filtering and concentrating into a flowable sticky extract;
(2) silica gel column chromatography: dissolving the extract by using pure methanol or pure ethanol or pure acetone with the weight ratio of 1.5-3 times, mixing the extract by using 80-100 meshes of silica gel with the weight ratio of 0.8-1.2 times of the extract, and then performing silica gel column chromatography by using 160 meshes of silica gel with the weight ratio of 2-4 times of the extract in a dry method; performing gradient elution with chloroform-acetone solution at volume ratio of 1:0, 20:1, 9:1, 8:2, 7:3, 6:4, 1:1 and 1:2, mixing the same parts, collecting eluate of each part, and concentrating;
(3) high-pressure liquid chromatography separation and purification: concentrating the eluate eluted with chloroform-acetone at a ratio of 8:2 to dry, dissolving with pure methanol, and further separating and purifying by high pressure liquid chromatographyUsing a C of 21.2mm × 250mm,5 μm18And (3) carrying out chromatographic column chromatography, wherein the flow rate is 20mL/min, the mobile phase is 66% methanol, the detection wavelength of an ultraviolet detector is 346nm, 200 mu L of sample injection is carried out every time, a chromatographic peak of 31.6min is collected, and the naphthalene compound is obtained by evaporation after multiple accumulation.
3. The method of claim 2, wherein: in the step (3), the compound obtained after the separation and purification by the high pressure liquid chromatography is firstly dissolved by pure methanol, and then the pure methanol is taken as a mobile phase, and is separated by gel column chromatography for further separation and purification.
4. Use of the naphthalene compound of claim 1 for inhibiting the spoilage of tobacco material and extending the shelf life of tobacco material.
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