CN113072602B - Phenolic acid glycosyl ester and preparation method thereof - Google Patents

Phenolic acid glycosyl ester and preparation method thereof Download PDF

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CN113072602B
CN113072602B CN202110252991.2A CN202110252991A CN113072602B CN 113072602 B CN113072602 B CN 113072602B CN 202110252991 A CN202110252991 A CN 202110252991A CN 113072602 B CN113072602 B CN 113072602B
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phenolic acid
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CN113072602A (en
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陈佳志
陈晓填
张靖雯
麦裕良
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Institute of Chemical Engineering of Guangdong Academy of Sciences
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    • C07ORGANIC CHEMISTRY
    • C07HSUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
    • C07H13/00Compounds containing saccharide radicals esterified by carbonic acid or derivatives thereof, or by organic acids, e.g. phosphonic acids
    • C07H13/02Compounds containing saccharide radicals esterified by carbonic acid or derivatives thereof, or by organic acids, e.g. phosphonic acids by carboxylic acids
    • C07H13/08Compounds containing saccharide radicals esterified by carbonic acid or derivatives thereof, or by organic acids, e.g. phosphonic acids by carboxylic acids having the esterifying carboxyl radicals directly attached to carbocyclic rings
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    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
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    • C07HSUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
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    • C07ORGANIC CHEMISTRY
    • C07HSUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
    • C07H13/00Compounds containing saccharide radicals esterified by carbonic acid or derivatives thereof, or by organic acids, e.g. phosphonic acids
    • C07H13/02Compounds containing saccharide radicals esterified by carbonic acid or derivatives thereof, or by organic acids, e.g. phosphonic acids by carboxylic acids
    • C07H13/04Compounds containing saccharide radicals esterified by carbonic acid or derivatives thereof, or by organic acids, e.g. phosphonic acids by carboxylic acids having the esterifying carboxyl radicals attached to acyclic carbon atoms

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Abstract

The invention provides phenolic acid glycosyl ester and a preparation method thereof, wherein the structure of the phenolic acid glycosyl ester is shown as a formula (I), a formula (II) or a formula (III). The phenolic acid glycosyl ester is obtained by derivatizing glucose, glucosamine or sucrose by phenolic acid, and has more excellent antibacterial and anti-inflammatory biological activity, high skin permeability and high water solubility compared with the existing glycosyl fatty acid ester. The phenolic acid base sugar ester preparation method utilizes the saccharide compound and the phenolic acid compound to prepare the phenolic acid base sugar ester under the catalysis of the organic base catalyst, so that side reaction can be reduced, conversion rate can be improved, product purity can be improved, and the preparation method is carried out in a reaction microchannel.

Description

Phenolic acid glycosyl ester and preparation method thereof
Technical Field
The invention relates to a glycosyl fatty acid ester compound, in particular to a phenolic acid glycosyl ester and a preparation method thereof.
Background
The glycosyl fatty acid ester is a biological functional chemical, is 100% natural in source, nontoxic and easy to biodegrade, has excellent surface activity, antibacterial and anti-inflammatory bioactivity and the like, such as C8-C16 fatty acid sucrose monoester/diester, sucrose sulfate, phenyl carboxylic acid sucrose ester derivative and the like, but the antibacterial and anti-inflammatory bioactivity of the existing glycosyl fatty acid ester needs to be improved.
Typically, glycosyl fatty acid esters are prepared from sugar and fatty acid (esters) or fatty acid chlorides by esterification or transesterification, with the most common synthetic strategies being chemical and biological. The chemical method is to co-operate in DMSO, DMF and depthSolvent systems such as melt solvents (DES) and the like or solvent-free conditions are adopted by KOH and K 2 CO 3 And the like, or organic metals such as Sn are adopted to catalyze the reaction of the carbohydrate and the fatty acid ester/fatty acyl chloride to synthesize the glycosyl fatty acid ester, and the mass transfer and the effective contact probability of molecules in the reaction process are low, the selective esterification of a plurality of hydroxyl groups is difficult to control due to the intrinsic characteristics of large difference of the molecular polarities of the carbohydrate and the fatty acid ester, similar activity of a plurality of hydroxyl groups of the sugar molecules and the like, so that the chemical method has the defects of serious side reaction, low reaction yield, poor regioselectivity and stereoselectivity of the carbohydrate ester product, complex separation and purification process, more pollution waste emission and the like.
Disclosure of Invention
The invention aims to overcome the defects existing in the prior art and provide phenolic acid glycosyl ester and a preparation method thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a phenolic acid glycosyl ester, wherein the structure of the phenolic acid glycosyl ester is shown as a formula (I), a formula (II) or a formula (III);
the substituent R is
The substituent R1 is hydroxyl, and the substituent R2 and R3 are hydroxyl or alkoxy.
The inventors derived glucose, glucosamine or sucrose from phenolic acid to obtain the above phenolic acid-based sugar ester, found that the above phenolic acid-based sugar ester has superior antibacterial and anti-inflammatory bioactivity, high skin permeability and high water solubility compared with the existing glycosyl fatty acid ester, and the phenolic acid-based sugar ester represented by formula (II) or (III) has better antibacterial property compared with formula (I).
Preferably, in the substituent group R, the substituent group R1 and the ester group are located at the para position of the phenyl group.
Preferably, the substituent R is
The inventor found through research that the phenyl on the substituent group R of the phenolic acid glycosyl ester has more than two substituent groups and at least comprises one hydroxyl group, and has more excellent anti-inflammatory biological activity.
Preferably, at least one of the substituents R2, R3 is hydroxy.
Preferably, the alkoxy group is methoxy.
The invention also provides a preparation method of any of the phenolic acid glycosyl esters, which comprises the following steps: the saccharide compound, phenolic acid compound and organic base catalyst are mixed and reacted in the reaction solvent at 110-140 deg.c.
The method utilizes the saccharide compound and the phenolic acid compound to prepare the phenolic acid-based sugar ester under the catalysis of the organic base catalyst, so that side reaction can be reduced, the conversion rate can be improved, and the purity of the product can be improved.
Preferably, the molar ratio of the saccharide compound and the phenolic acid compound is 1: (0.5-2).
Preferably, the saccharide compound is glucose, glucosamine or sucrose; the phenolic acid compound is methyl p-hydroxybenzoate, protocatechuic acid methyl ester, gallic acid methyl ester, methyl vanillic acid methyl ester, methyl syringate, 4-hydroxy cinnamic acid methyl ester, caffeic acid methyl ester, 3,4, 5-trihydroxy cinnamic acid methyl ester, ferulic acid methyl ester or sinapic acid methyl ester; the organic base catalyst is 1,5, 7-triazabicyclo [4.4.0] dec-5-ene, 1, 8-diazabicyclo undec-7-ene and 1, 5-diazabicyclo [4.3.0] non-5-ene, and the reaction solvent is dimethyl sulfoxide or N, N-dimethylformamide.
When the saccharide compound is glucose, preparing a compound shown in a formula (I); when the saccharide compound is glucosamine, preparing a compound shown in a formula (II); when the saccharide compound is sucrose, the compound represented by the formula (III) is prepared.
Preferably, the saccharide compound is glucosamine or sucrose.
The phenolic acid-based glucosamine ester and the phenolic acid-based sucrose ester have better antibacterial performance compared with the phenolic acid-based glucosamine ester.
Preferably, the reaction is performed in a reaction microchannel, a mixed solution of a carbohydrate compound and a reaction solvent, a mixed solution of a phenolic acid compound and the reaction solvent flows through the reaction microchannel, the reaction microchannel is a hollow pipeline, the reaction microchannel is provided with a liquid inlet and a liquid outlet, a deflector is arranged in the reaction microchannel, the deflector is arranged along the liquid flowing direction of the reaction microchannel, a plurality of netlike reaction plates distributed and arranged are fixed on the surface of the deflector and the inner surface of the reaction microchannel, the netlike reaction plates are obliquely fixed on the surface of the deflector or the inner surface of the reaction microchannel, an organic base catalyst is bonded on the netlike reaction plates, and the organic base catalyst is connected to resin through C-N or C-C bonds and is attached on the surface of the netlike reaction plates.
The preparation method of the phenolic acid glycosyl ester is carried out in a reaction microchannel, and a reticular reaction plate bonded with an organic base catalyst is arranged in the reaction microchannel, so that the mass transfer efficiency can be improved, the reaction degree is enhanced by providing a large catalytic activity specific surface in the reaction microchannel, the separation and purification cost of reaction products is greatly reduced, and the preparation method has the advantages of convenience in operation, economy and high efficiency.
Preferably, the mixed solution of the carbohydrate compound and the reaction solvent and the mixed solution of the phenolic acid compound and the reaction solvent flow in the reaction microchannel for 10-40 min.
The invention provides a preparation device of phenolic acid glycosyl ester, which is provided with a reaction micro-channel and a heating mechanism, wherein the reaction micro-channel is a hollow pipeline, the heating mechanism radiates to provide heat for the reaction micro-channel, the reaction micro-channel is provided with a liquid inlet and a liquid outlet, a guide plate is arranged in the reaction micro-channel, the guide plate is arranged along the liquid flow direction of the reaction micro-channel, a plurality of netlike reaction plates distributed and arranged are fixed on the surface of the guide plate and the inner surface of the reaction micro-channel, the netlike reaction plates are obliquely fixed on the surface of the guide plate or the inner surface of the reaction micro-channel, the netlike reaction plates are bonded with organic base catalysts, the bonding is that the organic base catalysts are connected to resin through C-N or C-C bonds, and the resin is attached on the surface of the netlike reaction plates.
According to the preparation device of the phenolic acid-based sugar ester, the reticular reaction plate bonded with the organic base catalyst is arranged in the reaction microchannel, the reaction degree is enhanced by providing a large catalytic activity specific surface in the reaction microchannel, the separation and purification cost of reaction products is greatly reduced, and the preparation device has the advantages of convenience in operation, economy and high efficiency.
Preferably, the plurality of netlike reaction plates are symmetrically distributed about the flow guide plate, the plurality of netlike reaction plates are fixed on the surface of the flow guide plate and the inner surface of the reaction microchannel in a fishbone shape, and the netlike reaction plates fixed on the same surface in the plurality of netlike reaction plates are parallel to each other.
According to the preparation device of the phenolic acid-based sugar ester, the reticular reaction plate bonded with the organic base catalyst is fixed on the surface of the guide plate and the inner surface of the reaction microchannel in a fish bone shape, so that the catalytic activity specific surface is improved, the mass transfer efficiency is improved to a greater extent, and the conversion rate of the phenolic acid-based sugar ester is improved.
Preferably, the heating mechanism is a microwave reactor, an inlet of the reaction micro-channel is communicated with a liquid inlet pump, and an outlet of the reaction micro-channel is communicated with a product collector.
Preferably, the length of the reaction microchannel is 3 to 30m.
Preferably, the cross section of the reaction micro-channel is rectangular, and the dimension of the reaction micro-channel is 12×1.5-18×3.2mm.
The invention has the beneficial effects that: the phenolic acid glycosyl ester has better antibacterial and anti-inflammatory biological activity, high skin permeability and high water solubility compared with the existing glycosyl fatty acid ester. The phenolic acid base sugar ester preparation method utilizes the saccharide compound and the phenolic acid compound to prepare the phenolic acid base sugar ester under the catalysis of the organic base catalyst, so that side reaction can be reduced, conversion rate can be improved, product purity can be improved, the preparation method is carried out in a reaction micro-channel, the mass transfer efficiency can be improved by arranging a netlike reaction plate bonded with the organic base catalyst in the reaction micro-channel, the reaction degree can be enhanced, the separation and purification cost of a reaction product can be greatly reduced, and the preparation method has the advantages of convenience in operation, economy and high efficiency.
Drawings
FIG. 1 is a schematic diagram of the apparatus for producing a phenolic acid-based sugar ester according to the present invention.
FIG. 2 is a partial cross-sectional view of a reaction microchannel of the apparatus for producing a phenolic acid-based sugar ester of the present invention.
The reaction micro-channel is characterized by comprising 1, a liquid inlet pump A,2, a liquid inlet pump B,3, a reaction micro-channel bonded with an organic base catalyst, 31, a guide plate, 32, a net-shaped reaction plate, 4, a product collector, 5 and a microwave heater.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples.
Example 1
As an embodiment of the present invention, the structure of the phenolic acid glycosyl ester is as follows:
in the preparation device of phenolic acid glycosyl ester of this embodiment, as shown in fig. 1 and fig. 2, the preparation device is provided with a reaction micro-channel 3 and a microwave heater 5, the reaction micro-channel 3 is a hollow pipeline, the microwave heater 5 radiates to provide heat for the reaction micro-channel 3, the reaction micro-channel 3 is provided with a liquid inlet and a liquid outlet, a deflector 31 is arranged in the reaction micro-channel 3, the deflector 31 is arranged along the liquid flow direction of the reaction micro-channel 3, a plurality of netlike reaction plates 32 distributed and arranged are fixed on the surface of the deflector 31 and the inner surface of the reaction micro-channel 3, the netlike reaction plates 32 are obliquely fixed on the surface of the deflector 31 or the inner surface of the reaction micro-channel 3, the netlike reaction plates 32 are bonded with organic base catalysts, the bonding is that the organic base catalysts are connected to resin through C-N or C-C bonds, and the resin is coated on the surface of the netlike reaction plates 32 to form a film;
the plurality of netlike reaction plates 32 are symmetrically distributed about the guide plate 31, the plurality of netlike reaction plates 32 are fixed on the surface of the guide plate 31 and the inner surface of the reaction microchannel 3 in a fishbone shape, and the netlike reaction plates fixed on the same surface in the plurality of netlike reaction plates 32 are parallel to each other;
the inlet of the reaction micro-channel 3 is communicated with a liquid inlet pump A1 and a liquid inlet pump B2, the outlet of the reaction micro-channel 3 is communicated with a product collector 4, the cross section of the reaction micro-channel 3 is rectangular, the size of the reaction micro-channel 3 is 15 multiplied by 2.5mm, and the length of the reaction micro-channel 3 is 15m.
The preparation method of the phenolic acid glycosyl ester of the embodiment is applied to the preparation device, and comprises the following steps:
(1) Glucose is prepared into a glucose solution with the mass concentration of 5% by using N, N-dimethylformamide, and methyl parahydroxybenzoate is prepared into a methyl parahydroxybenzoate solution with the mass concentration of 5%;
(2) Controlling the internal temperature of a reaction microchannel to be 120 ℃ by a microwave heater, and mixing glucose solution and methyl parahydroxybenzoate solution according to the molar ratio of 1:1 respectively inputting the mixed solution into a reaction micro-channel through a liquid inlet pump A1 and a liquid inlet pump B2, mixing to obtain a mixed solution, continuously flowing through the reaction micro-channel for reaction, wherein the flowing time of the mixed solution in the reaction micro-channel is 20min, and collecting a product through a product collector communicated with an outlet of the reaction micro-channel.
And (3) product testing: evaporating the product in the product collector to remove solvent, performing high performance liquid chromatography-mass spectrometry (HPLC-MS) and nuclear magnetic resonance detection, performing MS-ESI (-) on the main product,m/z:299.0764(M-H) - i.e. the molecular weight of the main product is 300.08; 1 H 13 the C HMBC two-dimensional nuclear magnetic results show a cross-peak of hydrogen with chemical shifts 4.27 and 4.37ppm and carbon with chemical shifts 174.5ppm, indicating that the carbonyl group of methyl parahydroxybenzoate reacts with the hydroxyl group of glucose C6 to form an ester. According to mass spectrum and nuclear magnetism result analysis, the chemical structure of the product is as follows:the purity was 95%.
Reaction evaluation: the product in the collector was evaporated to dryness and then subjected to high performance liquid chromatography-evaporative light scattering (HPLC-ELSD) analysis, with a glucose conversion of 98%, a methylparaben conversion of 97% and a yield of 96%.
Example 2
As an embodiment of the present invention, the structure of the phenolic acid glycosyl ester is as follows:
the only difference between the preparation method of the phenolic acid glycosyl ester of the present embodiment and that of the embodiment 1 is that: the methyl p-hydroxybenzoate was replaced with methyl protocatechuic acid.
And (3) product testing: evaporating the product in the collector to dryness, and then carrying out HPLC-MS and nuclear magnetic resonance detection, wherein the MS-ESI (-), m/z of the main product are as follows: 315.0784 (M-H) - I.e. the molecular weight of the main product is 316.08; 1 H 13 the chmbc two-dimensional nuclear magnetic results showed cross peaks of hydrogen with chemical shifts 4.27 and 4.37ppm and carbon with chemical shifts 174.5ppm, indicating that the carbonyl group of the methyl protocatechuic acid reacted with the hydroxyl group of glucose C6 to form an ester. According to mass spectrum and nuclear magnetism result analysis, the chemical structure of the product is as follows:the purity was 96%.
Reaction evaluation: the product in the collector was evaporated to dryness and subjected to HPLC-ELSD analysis, with a glucose conversion of 98% and a methyl protocatechuic acid conversion of 98% in 97% yield.
Example 3
As an embodiment of the present invention, the structure of the phenolic acid glycosyl ester is as follows:
the only difference between the preparation method of the phenolic acid glycosyl ester of the present embodiment and that of the embodiment 1 is that: methyl parahydroxybenzoate was replaced with methyl vanillic acid.
And (3) product testing: evaporating the product in the collector to dryness, and then carrying out HPLC-MS and nuclear magnetic resonance detection, wherein the MS-ESI (-), m/z of the main product are as follows: 329.0956 (M-H) - I.e. the molecular weight of the main product is 330.10; 1 H 13 the C HMBC two-dimensional nuclear magnetic results show that hydrogen with chemical shifts of 4.27 and 4.37ppm cross peaks with carbon with chemical shifts of 174.5ppm indicating that the carbonyl group of methyl vanillic acid reacts with the hydroxyl group of glucose C6 to form an ester. According to mass spectrum and nuclear magnetism result analysis, the chemical structure of the product is as follows:the purity was 95%.
Reaction evaluation: the product in the collector was evaporated to dryness and subjected to HPLC-ELSD analysis, the glucose conversion was 98%, the methyl vanillic acid conversion was 97% and the yield was 96%.
Example 4
As an embodiment of the present invention, the structure of the phenolic acid glycosyl ester is as follows:
the only difference between the preparation method of the phenolic acid glycosyl ester of the present embodiment and that of the embodiment 1 is that: methyl parahydroxybenzoate was replaced with methyl sinapite.
And (3) product testing: evaporating the product in the collector to dryness, and then carrying out HPLC-MS and nuclear magnetic resonance detection, wherein the MS-ESI (-), m/z of the main product are as follows: 385.1167 (M-H) - I.e. the molecular weight of the main product is 386.12; 1 H 13 c HMBC two-dimensional nuclear magnetism result display and conversionThe chemical shifts 4.27 and 4.37ppm of hydrogen cross peaks with 174.5ppm of carbon indicating that the carbonyl group of methyl sinapite reacted with the hydroxyl group of glucose C6 to form an ester. According to mass spectrum and nuclear magnetism result analysis, the chemical structure of the product is as follows:
the purity was 95%.
Reaction evaluation: the product in the collector was evaporated to dryness and subjected to HPLC-ELSD analysis, with a glucose conversion of 98%, a methyl sinapite conversion of 97% and a yield of 96%.
Example 5
As an embodiment of the present invention, the structure of the phenolic acid glycosyl ester is as follows:
the only difference between the preparation method of the phenolic acid glycosyl ester of the present embodiment and that of the embodiment 1 is that: glucose was replaced with glucosamine.
And (3) product testing: evaporating the product in the collector to dryness, and then carrying out HPLC-MS and nuclear magnetic resonance detection, wherein the MS-ESI (-), m/z of the main product are as follows: 298.0899 (M-H) - I.e. the molecular weight of the main product is 299.10; 1 H 13 the C HMBC two-dimensional nuclear magnetic results show a cross-peak of hydrogen with chemical shifts of 4.27 and 4.37ppm and carbon with chemical shifts of 174.5ppm, indicating that the carbonyl group of methyl parahydroxybenzoate reacts with the hydroxyl group of glucosamine C6 to form an ester. According to mass spectrum and nuclear magnetism result analysis, the chemical structure of the product is as follows:the purity was 95%.
Reaction evaluation: the product in the collector was evaporated to dryness and subjected to HPLC-ELSD analysis, the conversion of glucosamine was 97%, the conversion of methylparaben was 98% and the yield was 95%.
Example 6
As one of the phenolic acid glycosyl esters of the embodiments of the present invention,the phenolic acid glycosyl ester has the following structure:
the only difference between the preparation method of the phenolic acid glycosyl ester of the present example and that of example 5 is that: the methyl parahydroxybenzoate was replaced with methyl gallate.
And (3) product testing: evaporating the product in the collector to dryness, and then carrying out HPLC-MS and nuclear magnetic resonance detection, wherein the MS-ESI (-), m/z of the main product are as follows: 330.0854 (M-H) - I.e. the molecular weight of the main product is 331.09; 1 H 13 the two-dimensional nuclear magnetic results of chmbc showed cross peaks of hydrogen with chemical shifts 4.27 and 4.37ppm and carbon with chemical shifts 174.5ppm, indicating that the carbonyl group of methyl gallate reacted with the hydroxyl group of glucosamine C6 to form an ester. According to mass spectrum and nuclear magnetism result analysis, the chemical structure of the product is as follows:the purity was 95%.
Reaction evaluation: the product in the collector was evaporated to dryness and subjected to HPLC-ELSD analysis, the conversion of glucosamine was 97%, the conversion of methyl gallate was 98%, and the yield was 95%.
Example 7
As an embodiment of the present invention, the structure of the phenolic acid glycosyl ester is as follows:
the only difference between the preparation method of the phenolic acid glycosyl ester of the present example and that of example 5 is that: methyl parahydroxybenzoate was replaced with methyl vanillic acid.
And (3) product testing: evaporating the product in the collector to dryness, and then carrying out HPLC-MS and nuclear magnetic resonance detection, wherein the MS-ESI (-), m/z of the main product are as follows: 328.1023 (M-H) - I.e. the molecular weight of the main product is 329.11; 1 H 13 the two-dimensional nuclear magnetic resonance results of the C HMBC show that the hydrogen with chemical shifts of 4.27 and 4.37ppm and the carbon with chemical shift of 174.5ppm show cross peaks, indicating the carbonyl and amino groups of the methyl vanillic acid esterThe hydroxyl groups of glucose C6 react to form esters. According to mass spectrum and nuclear magnetism result analysis, the chemical structure of the product is as follows:the purity was 96%.
Reaction evaluation: the product in the collector was evaporated to dryness and subjected to HPLC-ELSD analysis, the conversion of glucosamine was 98%, the conversion of methyl vanillic acid was 98% and the yield was 96%.
Example 8
As an embodiment of the present invention, the structure of the phenolic acid glycosyl ester is as follows:
the only difference between the preparation method of the phenolic acid glycosyl ester of the present example and that of example 5 is that: the methyl p-hydroxybenzoate was replaced with methyl ferulate.
And (3) product testing: evaporating the product in the collector to dryness, and then carrying out HPLC-MS and nuclear magnetic resonance detection, wherein the MS-ESI (-), m/z of the main product are as follows: 354.1205 (M-H) - I.e. the molecular weight of the main product is 355.13; 1 H 13 the two-dimensional nuclear magnetic results of the chmbc showed cross peaks of hydrogen with chemical shifts 4.27 and 4.37ppm and carbon with chemical shifts 174.5ppm, indicating that the carbonyl group of methyl ferulate reacted with the hydroxyl group of glucosamine C6 to form an ester. According to mass spectrum and nuclear magnetism result analysis, the chemical structure of the product is as follows:the purity was 95%.
Reaction evaluation: the product in the collector was evaporated to dryness and subjected to HPLC-ELSD analysis, with a glucosamine conversion of 98%, a methyl ferulate conversion of 98% and a yield of 95%.
Example 9
As an embodiment of the present invention, the structure of the phenolic acid glycosyl ester is as follows:
the only difference between the preparation method of the phenolic acid glycosyl ester of the present embodiment and that of the embodiment 1 is that: sucrose was used to replace glucose and methyl protocatechuic acid was used to replace methyl parahydroxybenzoate.
And (3) product testing: evaporating the product in the collector to dryness, and then carrying out HPLC-MS and nuclear magnetic resonance detection, wherein the MS-ESI (-), m/z of the main product are as follows: 477.1237 (M-H) - I.e. the molecular weight of the main product is 478.13; 1 H 13 the C HMBC two-dimensional nuclear magnetic results show a cross-peak of hydrogen with chemical shifts 4.27 and 4.37ppm and carbon with chemical shifts 174.5ppm, indicating that the carbonyl group of the methyl protocatechuic acid reacts with the hydroxyl group of sucrose C6 to form an ester. According to mass spectrum and nuclear magnetism result analysis, the chemical structure of the product is as follows:the purity was 95%.
Reaction evaluation: the product in the collector was evaporated to dryness and subjected to HPLC-ELSD analysis, the sucrose conversion was 99%, the protocatechuic acid methyl ester conversion was 98%, and the yield was 95%.
Example 10
As an embodiment of the present invention, the structure of the phenolic acid glycosyl ester is as follows:
the only difference between the preparation method of the phenolic acid glycosyl ester of the present example and that of example 9 is that: methyl ester of protocatechuic acid is replaced by methyl ester of vanillic acid.
And (3) product testing: evaporating the product in the collector to dryness, and then carrying out HPLC-MS and nuclear magnetic resonance detection, wherein the MS-ESI (-), m/z of the main product are as follows: 491.1418 (M-H) - I.e. the molecular weight of the main product is 492.15; 1 H 13 the two-dimensional nuclear magnetic results of chmbc showed cross peaks of hydrogen at chemical shifts 4.27 and 4.37ppm and carbon at chemical shifts 174.5ppm, indicating that the carbonyl group of methyl vanillic acid reacted with the hydroxyl group of sucrose C6 to form an ester. According to mass spectrum and nuclear magnetism result analysis, the chemical structure of the product is as follows:the purity was 95%. />
Reaction evaluation: the product in the collector was evaporated to dryness and subjected to HPLC-ELSD analysis, the sucrose conversion was 99%, the methyl vanillic acid conversion was 98% and the yield was 95%.
Example 11
As an embodiment of the present invention, the structure of the phenolic acid glycosyl ester is as follows:
the only difference between the preparation method of the phenolic acid glycosyl ester of the present example and that of example 9 is that: the methyl ferulate is used for replacing the protocatechuic acid methyl ester.
And (3) product testing: evaporating the product in the collector to dryness, and then carrying out HPLC-MS and nuclear magnetic resonance detection, wherein the MS-ESI (-), m/z of the main product are as follows: 517.1518 (M-H) - I.e. the molecular weight of the main product is 518.16; 1 H 13 the two-dimensional nuclear magnetic results of the C HMBC show that the hydrogen with chemical shifts of 4.27 and 4.37ppm and the carbon with chemical shift of 174.5ppm show cross peaks, which means that the carbonyl of the methyl ferulate reacts with the hydroxyl of sucrose C6 to form an ester. According to mass spectrum and nuclear magnetism result analysis, the chemical structure of the product is as follows:
the purity was 95%.
Reaction evaluation: the product in the collector was evaporated to dryness and then subjected to HPLC-ELSD analysis, with a sucrose conversion of 99%, a methyl ferulate conversion of 99% and a yield of 95%.
Performance test
The antibacterial and anti-inflammatory properties of the phenolic acid glycosyl esters of examples 1-11 were tested.
The antibacterial properties of the phenolic acid glycosyl esters of examples 1 to 11 were evaluated by the shaking method of GB/T20944.3-2008, and gram-positive bacteria, staphylococcus aureus (ATCC 25923) and gram-negative bacteria, escherichia coli (ATCC 25922), were used as test bacteria. Respectively adding test bacteria into nutrient broth culture solution, oscillating at 30deg.C for 24 hr/min for activation to obtain bacterial suspension, testing in two groups, and sequentially adding 0.3mL staphylococcus aureus bacterial suspension, 20mL Phosphate (PBS) buffer solution, and 0.5mg phenolic acid glycosyl ester sample of example 1-example 11 into the first group of 11 test bottles; to a second set of 11 test flasks, 0.3mL of E.coli suspension, 20mL of Phosphate Buffer (PBS), and 1mg of the phenolic acid glycosylester sample of examples 1-11 were added, respectively, in sequence; each group was blank with the test without any test piece added, the test piece was sealed and oscillated at 24℃for 18 hours at 150 r/min. Taking 0.1mL of test solution from each test bottle, diluting by adopting a 10-fold dilution method, taking 0.1mL of test solution, transferring into a nutrient broth agar culture dish, shaking uniformly, placing into an incubator, culturing for 24 hours at 30 ℃, comparing the colony numbers of a blank group and a test group under the optimal dilution condition, and calculating the antibacterial rate, thereby evaluating the antibacterial performance of the phenolic group sugar ester. The results are shown in Table 1:
note that: c (C) Blank space : colony count of blank group; c (C) Experiment : colony count of the experimental group.
Table 1 antibacterial effect of phenolic acid sugar esters on the test bacteria in 2.
Phenolic acid sugar ester sample Bacterial strain Bacteriostasis rate (%) 1 Bacterial strain Bacteriostasis rate (%) 2
Example 1 Staphylococcus aureus 99.99% Coli bacterium 99.91%
Example 2 Staphylococcus aureus 99.99% Coli bacterium 99.93%
Example 3 Staphylococcus aureus 99.99% Coli bacterium 99.91%
Example 4 Staphylococcus aureus 99.99% Coli bacterium 99.91%
Example 5 Staphylococcus aureus 99.99% Coli bacterium 99.99%
Example 6 Staphylococcus aureus 99.99% Coli bacterium 99.99%
Example 7 Staphylococcus aureus 99.99% Coli bacterium 99.99%
Example 8 Staphylococcus aureus 99.99% Coli bacterium 99.99%
Example 9 Staphylococcus aureus 99.99% Coli bacterium 99.99%
Example 10 Staphylococcus aureus 99.99% Coli bacterium 99.99%
Example 11 Staphylococcus aureus 99.99% Coli bacterium 99.99%
1 Phenolic acid sugar ester sample concentration: 25 μg/mL; 2 phenolic acid sugar ester sample concentration: 50. Mu.g/mL.
As is clear from Table 1, when the concentration of the phenolic acid sugar ester was 25. Mu.g/mL, it was found that it was possible to kill at least 99.99% of Staphylococcus aureus; and when the concentration of the phenolic acid sugar ester is 50 mug/mL, more than 99.9% of escherichia coli can be killed. The phenolic acid glycosyl ester has obvious antibacterial performance. And the phenolic acid-based glucosamine esters of examples 5-8, the phenolic acid-based sucrose esters of examples 9-11 were found to have better antibacterial properties.
The inhibition of lipopolysaccharide-induced inflammatory response of mouse macrophage RAW264.7 was examined by measuring Nitric Oxide (NO) content using the Griess method. After passage of the mouse macrophage RAW264.7 cells, they were cultured in high sugar cell medium DMEM (dulbecco's minimum essential medium, DMEM, gibico) containing 10% Fetal Bovine Serum (FBS), various concentrations of phenolic acid glycosyl ester (10-100. Mu.g/mL) were added, bacterial lipopolysaccharide (1. Mu.g/mL) was used to induce inflammatory reaction, and the supernatant was collected after 16 hours. The Griess method is used for measuring the NO content in cell supernatant, and according to the influence of different concentrations on the release of NO by bacterial lipopolysaccharide-induced RAW264.7 cells, the method is used for reacting the NO level and evaluating the anti-inflammatory performance of phenolic acid-based sugar esters. The results are shown in Table 2:
table 2 inhibitory effect of phenolic acid based sugar esters on bacterial lipopolysaccharide induced release of NO by RAW264.7 cells.
As shown in Table 2, the phenolic acid glycosyl ester can effectively inhibit bacterial lipopolysaccharide-induced mouse macrophage RAW264.7 from generating excessive inflammatory mediator NO, and the effect shows concentration dependence and has excellent anti-inflammatory performance.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.

Claims (5)

1. A phenolic acid glycosyl ester, characterized in that the phenolic acid glycosyl ester has the structure shown below:
2. a process for the preparation of a phenolic acid-based sugar ester according to claim 1, characterized in that the process comprises the steps of: mixing a saccharide compound, a phenolic acid compound and an organic base catalyst, and then reacting in a reaction solvent at 110-140 ℃; the reaction is carried out in a reaction microchannel, a mixed solution of a carbohydrate compound and a reaction solvent, a phenolic acid compound and the reaction solvent flow through the reaction microchannel, the reaction microchannel is a hollow pipeline, the reaction microchannel is provided with a liquid inlet and a liquid outlet, a guide plate is arranged in the reaction microchannel, the guide plate is arranged along the liquid flow direction of the reaction microchannel, a plurality of netlike reaction plates distributed and arranged are fixed on the surface of the guide plate and the inner surface of the reaction microchannel, the netlike reaction plates are obliquely fixed on the surface of the guide plate or the inner surface of the reaction microchannel, an organic base catalyst is bonded on the netlike reaction plates, and the organic base catalyst is connected to resin through C-N or C-C bonds and is attached on the surface of the netlike reaction plates.
3. The method for producing a phenolic acid-based sugar ester according to claim 2, wherein the saccharide compound is glucose, glucosamine or sucrose; the phenolic acid compound is methyl p-hydroxybenzoate, protocatechuic acid methyl ester, gallic acid methyl ester, methyl vanillic acid methyl ester, methyl syringate, 4-hydroxy cinnamic acid methyl ester, caffeic acid methyl ester, 3,4, 5-trihydroxy cinnamic acid methyl ester, ferulic acid methyl ester or sinapic acid methyl ester; the organic base catalyst is 1,5, 7-triazabicyclo [4.4.0] dec-5-ene, 1, 8-diazabicyclo undec-7-ene and 1, 5-diazabicyclo [4.3.0] non-5-ene, and the reaction solvent is dimethyl sulfoxide or N, N-dimethylformamide.
4. The preparation device of the phenolic acid glycosyl sugar ester is characterized in that the preparation device is provided with a reaction micro-channel and a heating mechanism, the reaction micro-channel is a hollow pipeline, the heating mechanism radiates to provide heat for the reaction micro-channel, the reaction micro-channel is provided with a liquid inlet and a liquid outlet, a guide plate is arranged in the reaction micro-channel, the guide plate is arranged along the liquid flow direction of the reaction micro-channel, a plurality of netlike reaction plates distributed and arranged are fixed on the surface of the guide plate and the inner surface of the reaction micro-channel, the netlike reaction plates are obliquely fixed on the surface of the guide plate or the inner surface of the reaction micro-channel, an organic base catalyst is bonded on the netlike reaction plates, and the organic base catalyst is connected to resin through C-N or C-C bonds and is attached to the surface of the netlike reaction plates.
5. The apparatus for preparing phenolic acid-based sugar ester according to claim 4, wherein the plurality of mesh-shaped reaction plates are symmetrically distributed about the baffle, the plurality of mesh-shaped reaction plates are fixed on the surface of the baffle and the inner surface of the reaction microchannel in a fishbone shape, the mesh-shaped reaction plates fixed on the same surface among the plurality of mesh-shaped reaction plates are parallel to each other, the heating mechanism is a microwave reactor, the inlet of the reaction microchannel is communicated with a liquid inlet pump, and the outlet of the reaction microchannel is communicated with a product collector.
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