CN103667395A - Method for synthesizing 6''-O-palmitoyl-naringin dihydrochalcone ester on line by using lipase as catalyst - Google Patents
Method for synthesizing 6''-O-palmitoyl-naringin dihydrochalcone ester on line by using lipase as catalyst Download PDFInfo
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Abstract
The invention discloses a method for synthesizing a 6''-O-palmitoyl-naringin dihydrochalcone ester on line by using lipase as a catalyst, which comprises the following steps: by using naringin dihydrochalcone and vinyl palmitate in a mole ratio of 1:(1-9) as raw materials, 0.5-1.0g of lipase Lipozyme RMIM as a catalyst and a tertiary amyl alcohol-DMSO (dimethyl sulfoxide) mixed solvent as a reaction solvent, uniformly filling the lipase Lipozyme RMIM into a reaction channel of a microfluidic channel reactor, wherein the internal diameter of the reaction channel of the microfluidic channel reactor is 0.8-2.4mm, and the reaction channel is 0.5-1.0m long; continuously introducing the raw materials and the reaction solvent into the reaction channel to perform acylation reaction, wherein the acylation reaction temperature is controlled at 40-55 DEG C, and the acylation reaction time is 15-35 minutes; and collecting the reaction solution on line, and carrying out conventional after-treatment on the reaction solution to obtain the 6''-O-palmitoyl-naringin dihydrochalcone ester. The method has the advantages of short reaction time, high selectivity and high yield.
Description
(1) technical field
The present invention relates to the method for the synthetic 6''-O-palmityl-naringin dihydrochalcone ester of a kind of lipase-catalyzed online controlled selectivity.
(2) background technology
Naringin dihydrochalcone (Naringin dihydrochalcone) is the flavone derivative that the naringin that separation and Extraction obtains from natural citrus is formed through peroxidation, its sugariness is 500～700 times of sucrose, it has high sugariness, the feature such as low in calories, nontoxic, safe, there is the multiple biological activitys such as anticancer, antibacterial, antioxygen, decreasing cholesterol, be therefore applied to food, medicine and daily chemical industry.In addition, naringin dihydrochalcone clean taste, with special delicate fragrance, have the effect of splendid shielding bitter taste, so naringin dihydrochalcone is specially adapted to vegetable based food processing, jam, chewing gum, toothpaste and sucks in tablet.
The various biological activitys of flavonoid compound all be take anti-oxidant activity as basis according to the study, relevant with Green Tea Extract or anti peroxidation of lipid.Special structure is given the chemical property of its a series of uniqueness, if with many kinds of metal ions generation complexing or electrostatic interaction, there is reduction and catch the characteristic of free radical and many derivative reaction activity etc.Flavonoid compound inhibition low-density lipoprotein LDL is oxidized and the research of inhibition carotenoid and unsaturated fatty acids acid oxidase shows, aglycon has more outstanding anti-oxidant activity than glucosides.This is because aglycon lipotropy is strong, can embed in the kernel of microbial film hydrophobic layer and play a role.The poly-hydroxy of flavonoid glycoside compound and glycosyl structure make it have certain wetting ability, and this will certainly affect anti-oxidant activity.Flavonoid compound is modified by esterification, and in molecule, introducing long hydrocarbon chain can increase the fat-soluble of it, thereby increases and fatty consistency and raising oxidation-resistance.So, naringin dihydrochalcone is as one of maximum flavonoid compound of application, and researching and developing the naringin dihydrochalcone fatty acid ester that its physiologically active is stronger will have a good application prospect.
At present, the route of synthesis of naringin dihydrochalcone fatty acid ester is mainly in organic medium, to carry out enzymatic reaction, and the hydroxyl on glycosyl is carried out to acylations, specifically comprises acidylate, esterification and three kinds of methods of transesterification reaction.The mild condition although enzymatic reaction responds, the advantage that selectivity is good, but enzymic catalytic reaction is having some limitations property also, such as the restriction between the activity of enzyme and the polarity of organic solvent, restriction between the polarity of organic solvent and the solvability of reaction substrate, long, transformation efficiency of reaction times is high-technology bottleneck not.Therefore, searching naringin dihydrochalcone enzymatic selective esterification new technology is significant for the production of development naringin dihydrochalcone fatty acid ester.
Micro-fluidic (Microfluidics) is in micron order structure, to control to receive to rise to technology and the science that skin rises volume fluid, is the new cross discipline emerging rapidly nearly ten years.Current, the development of micro-fluidic has surmounted the original object that is mainly analytical chemistry service greatly, and is becoming the important technological platform of whole chemistry subject, life science, instrumental science and even information science new round innovation research.
From Harrison seminar in 1997, delivered after the document of first piece of writing synthetic compound in micro-fluidic chip microreactor, micro-fluidic chip reactor has been successfully used to multiple organic synthesis, and has shown application prospect widely.Along with the development of micro-mixing, micro-reaction technology in micro-fluidic chip, in chip, carry out building-up reactions and become one of the study hotspot in micro-fluidic chip field.
With conventional chemical reactor, compare, micro passage reaction not only has the diffusion length making between reactant to be shortened greatly, and mass transfer velocity is fast; The easy control of reaction conditions such as reactant ratio, temperature, reaction times and flow velocity, side reaction is less; Need reactant consumption very micro-, not only can reduce the consumption of costliness, poisonous, adverse reaction thing, the environmental pollutant that produce in reaction process are also few, are the technology of a kind of environmental friendliness, study on the synthesis novel substance.
At present, there is more Chinese scholars to be studied the enzymatic regioselectivity esterification of flavonoid compound in organic medium, but also do not have for the research of the enzymatic modification of naringin dihydrochalcone.And in the organic medium of having reported, the enzymatic regioselectivity esterification process of flavonoid compound often needs the reaction times (24h) of growing, and transformation efficiency and the selectivity of reaction are not high, utilizing microflow control technique to explore new building-up reactions, is current international and domestic study hotspot in order to solve the technical bottleneck of existing synthetic method.Our research group early stage has also been carried out systematic study to the enzymatic selectivity of saccharide compound in micro-fluidic reactor is synthetic, finds to utilize microflow control technique to carry out that the enzymatic selectivity of saccharide compound is synthetic has certain feasibility.And naringin dihydrochalcone is the flavone derivative that the naringin that separation and Extraction obtains from natural citrus is formed through peroxidation, there is good anticancer, antibacterial, anti-oxidant, decreasing cholesterol, reduction capillary fragility, the multiple biological activitys such as microcirculation of improving.The regioselectivity esterification of naringin dihydrochalcone is modified and not only can be improved bioavailability, can also expand it in the application in the fields such as medicine, food.And naringin dihydrochalcone is the sugary flavone derivative of a class, we can utilize the Research foundation in early stage to study the enzymatic regioselectivity esterification of naringin dihydrochalcone.Therefore we have studied the method for the synthetic 6''-O-palmityl-naringin dihydrochalcone ester of lipase-catalyzed selectivity in microfluidic channel reactor, are intended to find a kind of online controlled method for selective synthesis of naringin dihydrochalcone palmitinic acid monoesters of high-efficiency environment friendly.Naringin dihydrochalcone monoesters due to different chain length replacement, its solvability, cell permeabilities etc. have a great difference, thereby the naringin dihydrochalcone monoester class compound that utilizes the synthetic different chain length of microflow control technique to replace, can further investigate its bioavailability, expand it in the application in the fields such as medicine and food.
(3) summary of the invention
The technical problem to be solved in the present invention is to provide the novel process of the synthetic 6''-O-palmityl-naringin dihydrochalcone ester of lipase-catalyzed selectivity in a kind of microfluidic channel reactor, has advantages of that the reaction times is short, selectivity is high and productive rate is high.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of method of lipase-catalyzed online synthetic 6''-O-palmityl-naringin dihydrochalcone ester, described method adopts microfluidic channel reactor, described microfluidic channel reactor comprises syringe pump, syringe, reaction channel and product collector, described syringe is installed in syringe pump, by first interface, be communicated with the entrance of reaction channel, described product collector is communicated with the outlet of reaction channel by the second interface, described reaction channel internal diameter is 0.8～2.4mm, and reaction channel length is 0.5～1.0 m, described method comprises: naringin dihydrochalcone and palmitinic acid vinyl acetate that the ratio of amount of substance of take is 1:1～1:9 are raw material, 0.5～1.0g Lipozyme RMIM of take is catalyzer, the mixed solvent of tertiary amyl alcohol and methyl-sulphoxide (DMSO) of take is reaction solvent, by Lipozyme RMIM uniform filling in reaction channel, raw material and reaction solvent are placed in to syringe, syringe carries out acylation reaction in raw material and reaction solvent being passed into reaction channel continuously under the promotion of syringe pump, controlling acylation reaction temperature is 40～55 ℃, the acylation reaction time is 15～35min, by product collector, collect online reaction solution, reaction solution makes 6''-O-palmityl-naringin dihydrochalcone ester through aftertreatment.
In the microfluidic channel reactor that the present invention adopts, described syringe number can be one or more, depending on concrete reaction requirement.Such as, when using two syringes, can adopt T-shaped or Y type interface to be connected with the entrance of reaction channel, different reactants is introduced from two entrances, conflux and enter public reaction channel, middle reactant molecule contact by microchannel increases with probability of collision, makes two strands of reaction solution streams in public reaction channel, mix and react.Syringe pump synchronously promotes a plurality of syringes.
Described microfluidic channel reactor also comprises thermostat container, and described reaction channel is placed in thermostat container, and for example thermostat container is enclosed in reaction channel in case, with this, can effectively control temperature of reaction.Described thermostat container can require to select voluntarily according to temperature of reaction, such as constant temperature water bath case etc.
The present invention does not limit for the material of reaction channel, and recommendation is green, the material of environmental protection, for example silicone tube; Shape for reaction channel is preferably curved shape, can guarantee at the uniform velocity stable the passing through of reaction solution.
The present invention, in implementation process, can first use the mixed solvent (tertiary amyl alcohol: DMSO=4:1) dissolve naringin dihydrochalcone, its consumption needs only and guarantees that naringin dihydrochalcone can fully dissolve, and is loaded in syringe standby of tertiary amyl alcohol and DMSO; Only with nontoxic tertiary amyl alcohol, dissolve palmitinic acid vinyl acetate, be loaded in another syringe standby; Then for example, under the synchronous promotion of syringe pump (PHD2000 syringe pump), make raw material and reaction solvent react in passing into reaction channel.Therefore, in the present invention, in reaction solvent, tertiary amyl alcohol and DMSO volume ratio are greater than 4:1, than conventional shaking table reaction, can the usage quantity of poisonous DMSO are down to minimum.
Comparatively preferred, method of the present invention comprises the following steps:
The tertiary amyl alcohol that is first 4:1 by volume ratio and the mixed solvent of DMSO dissolve naringin dihydrochalcone, are loaded in syringe standby; With tertiary amyl alcohol, dissolve palmitinic acid vinyl acetate, be loaded in another syringe standby; Two syringes are connected with the entrance of reaction channel by Y type interface, carry out acylation reaction in then raw material and reaction solvent being passed into reaction channel under the synchronous promotion of syringe pump.
When using two syringes be dissolved with the tertiary amyl alcohol of naringin dihydrochalcone and the mixing solutions of DMSO and be dissolved with the tertiary amyl alcohol solution of palmitinic acid vinyl acetate to reaction channel injection respectively, for dissolving, the volumetric usage of the tertiary amyl alcohol of palmitinic acid vinyl acetate preferably equates with the volumetric usage of dissolving the tertiary amyl alcohol of naringin dihydrochalcone and the mixed solvent of DMSO, so that the consistence of assurance two kinds of material molar ratios while entering reaction channel.
Describedly for dissolving the volumetric usage of the tertiary amyl alcohol of naringin dihydrochalcone and the mixed solvent of DMSO, conventionally with the amount of substance of naringin dihydrochalcone, count 10～25mL/mmol.
In the present invention, the commodity that described Lipozyme RMIM is used letter (novozymes) company of Novi to produce, being a kind of lipase obtaining from Rhizomucor miehei, is that aspergillus oryzae (Aspergillus oryzae) microorganism with a kind of gene modification produces through submerged fermentation.Lipozyme RM IM is granular product, and granularity is 0.2-0.6 mm.
The inventive method at reaction channel, is directly evenly fixed on granular catalyzer Lipozyme RMIM uniform filling in reaction channel by mechanical means.
Further, the mol ratio of described naringin dihydrochalcone and palmitinic acid vinyl acetate is preferably 1:7～9, most preferably is 1:7.
Further, described acylation reaction temperature is preferably 52～55 ℃, most preferably is 52 ℃.
Further, the described acylation reaction time is preferably 25～35min, most preferably is 30min.Can be by regulating syringe pump to regulate the flow velocity of reaction channel inner fluid and then regulating the residence time of raw material in reaction channel, i.e. reaction times.
Reaction product of the present invention can be collected online, and gained reaction solution can obtain 6''-O-palmityl-naringin dihydrochalcone ester by conventional post-treating method.Described conventional post-treating method can be: the underpressure distillation of gained reaction solution is except desolventizing, residuum is separated through silica gel column chromatography, with 200-300 order silica gel wet method dress post, elution reagent is the mixed solvent that ethyl acetate, methyl alcohol, water volume ratio are 25:2.5:0.6, wet method upper prop after residuum dissolves with a small amount of elution reagent, collect elutriant, TLC follows the tracks of wash-out process simultaneously, the elutriant that contains single product obtaining is merged to evaporate to dryness, can obtain flaxen monoesters crystal, be 6''-O-palmityl-naringin dihydrochalcone ester.
The reaction channel internal diameter that the present invention uses is 2mm, and reaction channel is long is 1.0m.Reaction channel internal diameter and length can affect rate of flow of fluid and the residence time in reaction channel, but do not cause direct impact to reacting itself.
In the present invention, although there are 6 hydroxyls that performance is close in naringin dihydrochalcone, but the synthetic 6''-O-palmityl-naringin dihydrochalcone ester of lipase-catalyzed selectivity has higher transformation efficiency and selectivity in micro-fluidic micro passage reaction, the transformation efficiency of diester is very low, almost there is no the content 100% of the monoesters obtaining by column chromatography for separation.The structure of product is confirmed through 1HNMR.This shows that the enzymatic selectivity of naringin dihydrochalcone cetylate in micro-fluidic micro passage reaction is synthetic and has good reaction conversion ratio and selectivity, can realize high monoesters rate.
Compared with prior art, beneficial effect of the present invention is: the synthetic naringin dihydrochalcone-6''-O-cetylate of selectivity in microfluidic channel reactor of the present invention, this method has not only shortened the reaction times widely, and has high transformation efficiency and reaction preference; The usage quantity that has simultaneously reduced DMSO, has environment-friendly advantage.
(4) accompanying drawing explanation
Fig. 1 is the structural representation of the microfluidic channel reactor of embodiment of the present invention employing.
(5) embodiment
With specific embodiment, protection scope of the present invention is described further below, but protection scope of the present invention is not limited to this:
The structure of the microfluidic channel reactor that the embodiment of the present invention is used, with reference to figure 1, comprises a syringe pump (not shown), two syringes 1, reaction channel 3, constant temperature water bath case (5, only show its floor map) and product collector 4; Two syringes 1 are installed in syringe pump, by a Y type interface, be communicated with the entrance of reaction channel 3, described reaction channel 3 is placed in constant temperature water bath case 5, by constant temperature water bath case 5, control temperature of reaction, the internal diameter 2.0mm of described reaction channel 3, pipe range 1m, the outlet of described reaction channel 3 is communicated with product collector 4 by an interface.
Synthesizing of embodiment 1:6''-O-palmityl-naringin dihydrochalcone ester
Equipment therefor is with reference to figure 1.Naringin dihydrochalcone (0.49mmol) is dissolved in the mixed solvent of 10 mL tertiary amyl alcohol: DMSO=4:1 (v/v), palmitinic acid vinyl acetate (3.43mmol) is dissolved in 10mL tertiary amyl alcohol, is then loaded on respectively in 10mL syringe standby.0.87g Lipozyme RMIM uniform filling is in the reaction channel of microfluidic channel reactor, and under PHD2000 syringe pump promotes, two-way reaction solution is respectively with totally 10.4 μ Lmin
-1flow velocity by " Y " type joint, enter in reaction channel and react, by constant temperature water bath case, control temperature of reactor at 52 ℃, on syringe pump, show that in reaction channel, reaction solution actual volume is 314 microlitres, reaction solution is continuous flow reaction 30min in reaction channel, and reaction result is followed the tracks of and detected by thin-layer chromatography TLC.
By product collector, collect online reaction solution, underpressure distillation is except desolventizing, with 200-300 order silica gel wet method dress post, elution reagent is ethyl acetate: methyl alcohol: water volume ratio=25:2.5:0.6, the high 35cm of post, column diameter 4.5cm, wet method upper prop after sample dissolves with a small amount of elution reagent, elutriant is collected flow velocity 2mLmin
-1, TLC follows the tracks of wash-out process simultaneously, and the elutriant that contains single product obtaining is merged to evaporate to dryness, obtains flaxen monoesters crystal, obtains naringin dihydrochalcone-6''-cetylate, is 6''-O-palmityl-naringin dihydrochalcone ester.HPLC detects naringin dihydrochalcone transformation efficiency 90%, and the selectivity of naringin dihydrochalcone-6''-cetylate (the naringin dihydrochalcone ester total content of the content/generation of naringin dihydrochalcone-6''-cetylate) is 100%.
Nuclear-magnetism characterization result is as follows:
1h-NMR (DMSO-d6, δ, ppm): naringin dihydrochalcone-6''-cetylate: 12.33 (s, 2H, H
5), 9.15 (s, H
4'), 7.03 (d, 2H, J=8.4Hz, H
2'andH
6'), 6.67 (d, 2H, J=8.5Hz, H
3'and H
5'), 5.99 (s, 2H, H
6and H
8), 5.44 (m, 1H, H
1''), 5.41 (m, 1H, 2'''-OH of naringin dihydrochalcone), 5.12 (m, 1H, H
1'''), 5.08 (d, 1H, J=5.1Hz, 4'''-OH of naringin dihydrochalcone), 4.70 (d, 1H, J=4.8Hz, 4''-OH of naringin dihydrochalcone), 4.68 (d, 1H, J=4.4 Hz, 3''-OH of naringin dihydrochalcone), 4.50 (d, 1H, J=5.8Hz, 3'''-OH of naringin dihydrochalcone), 4.26 (d, 1H, J=11.9Hz, H
6''acylated), 4.04 (m, 1H, H
6''acylated), 3.73-3.16 (8H, H of rhamnoglucosyl), 3.22 (m, 2H, H
3), 2.78 (t, 2H, J=7.7Hz, H
2), 2.27 (m, 2H ,-CH
2-CO-), 1.49 (m, 3H of CH
3of rhamnosyl), 1.26 (m, 26H of (CH
2)
13of palmitoyl), 0.86 (t, 3H, J=7.0Hz, CH
3).
IR(KBr,cm
-1):3415(OH),1740(C=O),1643(C=C).
ESI-MS(m/z):855(M
1+2H
2O-H)
-,M
1corresponding?exactly?to?the?molecular?weight?of?6''-O-palmitoyl?-naringin?dihydrochalcone.
Embodiment 2-5
The temperature that changes microfluidic channel reactor, other are with embodiment 1, and reaction result is as shown in table 1:
Table 1: the impact of temperature on reaction
The result of table 1 shows, when flow velocity is 10.4 μ Lmin
-1reaction times is while being 30min, reaction is with the rising of temperature, transformation efficiency also obviously raises, and when temperature of reaction reaches 52 ℃, the transformation efficiency of reaction and selectivity are all best, if now continued, heat up, will cause the reduction of enzymic activity, thereby cause transformation efficiency and the selectivity of reaction to decrease, thus in the present invention in micro-fluidic micro passage reaction the optimal reaction temperature of naringin dihydrochalcone cetylate be 52 ℃.
Embodiment 6-9
Changing the substrate mol ratio of palmitinic acid vinyl acetate and naringin dihydrochalcone in micro-fluidic micro passage reaction is 1:1(embodiment 6), 3:1(embodiment 7), 5:1(embodiment 8), 9:1(embodiment 9), the consumption of naringin dihydrochalcone is that 0.49mmol is constant, changes the consumption of palmitinic acid vinyl acetate.Other are with embodiment 1, and result is as shown in table 2.
Table 2: naringin dihydrochalcone is compared the impact of reacting with palmitinic acid vinyl acetate substrate
The result of table 2 shows, along with the increase of reactant palmitinic acid vinyl acetate, the transformation efficiency of reaction is also along with increase, when substrate ratio is 7:1, the transformation efficiency of reaction and selectivity are optimum, and naringin dihydrochalcone has substantially quantitatively transformed the cetylate for naringin dihydrochalcone-6''-completely.If now continue to increase the consumption of reactant palmitinic acid vinyl acetate, transformation efficiency and the elective reduction that will cause reaction, thereby, the best substrate of this reaction is than being 7:1, under this reaction conditions, naringin dihydrochalcone transforms the cetylate for naringin dihydrochalcone-6''-substantially completely.
Embodiment 10-13
Changing the reaction times in micro-fluidic micro passage reaction is 15min(embodiment 10), 20min(embodiment 11), 25min(embodiment 12), 35min(embodiment 13), other are with embodiment 1, result is as shown in table 3.
Table 3: the reaction times is on reaction conversion ratio and optionally impact
| Embodiment | Reaction times [min] | Transformation efficiency [%] | Selectivity [%] |
| 10 | 15 | 52 | 100 |
| 11 | 20 | 66 | 100 |
| 12 | 25 | 75 | 100 |
| 1 | 30 | 90 | 100 |
| 13 | 35 | 82 | 99 |
The result of table 3 shows, reaction is carried out 15min and can be obtained naringin dihydrochalcone-6''-palmitinic acid monoesters of 52%, and selectivity is now 100%, and naringin dihydrochalcone is to be converted into naringin dihydrochalcone-6''-palmitinic acid monoesters completely substantially.Along with the increase in reaction times, the transformation efficiency of reaction increases gradually, and when 30min is carried out in reaction, the transformation efficiency of reaction and selectivity are optimum, and naringin dihydrochalcone-6''-palmitinic acid monoesters transformation efficiency can reach 90%, and reaction preference also can reach 100%.If now continue to extend the reaction times, can cause on the contrary reaction conversion ratio and optionally reduce, thereby in microfluidic channel reactor, the synthetic Best Times of naringin dihydrochalcone-6''-palmitinic acid monoesters is 30min.
Comparative example 1～3
Change the catalyzer in micro-fluidic micro passage reaction, change respectively Lipozyme TLIM(comparative example 1 into), lipase Novozym 435(comparative example 2), bacillus alkaline protease (comparative example 3), other are with embodiment 1, and result is as shown in table 4.
Table 4: different enzymes are on reaction conversion ratio and optionally impact
| ? | Enzyme source | Transformation efficiency [%] | Selectivity [%] |
| Comparative example 1 | Lipozyme?TLIM | 53 | 100 |
| Comparative example 2 | Novozym?435 | 30 | 100 |
| Comparative example 3 | Bacillus alkaline protease | 11 | 100 |
| |
Lipozyme?RMIM | 90 | 100 |
The result of table 4 shows, for the regioselectivity esterification of enzymatic naringin dihydrochalcone in microfluidic channel reactor, different enzymes has fairly obvious impact to reaction.Utilize Lipozyme TLIM catalyzed reaction, the transformation efficiency of naringin dihydrochalcone-6''-palmitinic acid monoesters is 53%.And utilizing this reaction of bacillus alkaline protease catalysis, the transformation efficiency of naringin dihydrochalcone-6''-palmitinic acid monoesters is only 11%.Result from table 4, for the regioselectivity esterification of enzymatic naringin dihydrochalcone in microfluidic channel reactor, the most effective catalyzer is Lipozyme RMIM, and the transformation efficiency of naringin dihydrochalcone is 90%, and selectivity is 100%.
Comparative example 4～5
Change different types of flavonoid compound in micro-fluidic micro passage reaction, change respectively the naringin dihydrochalcone (0.49mmol) of embodiment 1 into hesperidine 0.49mmol(comparative example 4), saligenin 0.49mmol(comparative example 5), other are with embodiment 1, result is as shown in table 5.
Table 5: different flavonoid compounds are on reaction conversion ratio and optionally impact
| ? | Flavone derivative | Transformation efficiency [%] | Selectivity [%] |
| Comparative example 4 | Hesperidine | 2 | 100 |
| Comparative example 5 | Saligenin | 8 | 100 |
| |
Naringin dihydrochalcone | 90 | 100 |
The result of table 5 shows, for the regioselectivity esterification of enzymatic flavonoid compound in microfluidic channel reactor, different flavonoid compounds has different reaction results.Hesperidine is under same reaction conditions, and transformation efficiency is only 2%, and reaction and difficulty thereof, react hardly.The reaction result of saligenin is also undesirable, and transformation efficiency is only 8%.From the result of table 5, for the regioselectivity esterification of enzymatic flavonoid compound in microfluidic channel reactor, naringin dihydrochalcone can be obtained more satisfactory reaction result, and the transformation efficiency of reaction can reach 90%, and selectivity is 100%.
Claims (8)
1. the method for lipase-catalyzed online synthetic 6''-O-palmityl-naringin dihydrochalcone ester, it is characterized in that described method adopts microfluidic channel reactor, described microfluidic channel reactor comprises syringe pump, syringe, reaction channel and product collector, described syringe is installed in syringe pump, by first interface, be communicated with the entrance of reaction channel, described product collector is communicated with the outlet of reaction channel by the second interface, described reaction channel internal diameter is 0.8～2.4mm, and reaction channel length is 0.5～1.0m, described method comprises: naringin dihydrochalcone and palmitinic acid vinyl acetate that the ratio of amount of substance of take is 1:1～9 are raw material, 0.5～1.0g Lipozyme RMIM of take is catalyzer, the mixed solvent of tertiary amyl alcohol and methyl-sulphoxide of take is reaction solvent, by Lipozyme RMIM uniform filling in reaction channel, raw material and reaction solvent are placed in to syringe, syringe carries out acylation reaction in raw material and reaction solvent being passed into reaction channel continuously under the promotion of syringe pump, controlling acylation reaction temperature is 40～55 ℃, the acylation reaction time is 15～35min, by product collector, collect online reaction solution, reaction solution makes 6''-O-palmityl-naringin dihydrochalcone ester through aftertreatment.
2. the method for lipase-catalyzed online synthetic 6''-O-palmityl-naringin dihydrochalcone ester as claimed in claim 1, it is characterized in that: the tertiary amyl alcohol that it is first 4:1 by volume ratio that described method comprises the following steps: and the mixed solvent of DMSO dissolve naringin dihydrochalcone, are loaded in syringe standby; With tertiary amyl alcohol, dissolve palmitinic acid vinyl acetate, be loaded in another syringe standby; Two syringes are connected with the entrance of reaction channel by Y type interface, carry out acylation reaction in then raw material and reaction solvent being passed into reaction channel under the synchronous promotion of syringe pump.
3. the method for lipase-catalyzed online synthetic 6''-O-palmityl-naringin dihydrochalcone ester as claimed in claim 1, is characterized in that: described microfluidic channel reactor comprises thermostat container, and described reaction channel is placed in thermostat container.
4. the method for lipase-catalyzed online synthetic 6''-O-palmityl-naringin dihydrochalcone ester as claimed in claim 2, is characterized in that: described microfluidic channel reactor comprises thermostat container, and described reaction channel is placed in thermostat container.
5. the method for the lipase-catalyzed online synthetic 6''-O-palmityl-naringin dihydrochalcone ester as described in one of claim 1～4, is characterized in that: described naringin dihydrochalcone is 1:7～9 with the ratio of the amount of substance of palmitinic acid vinyl acetate.
6. the method for the lipase-catalyzed online synthetic 6''-O-palmityl-naringin dihydrochalcone ester as described in one of claim 1～4, is characterized in that: described acylation reaction temperature is 52～55 ℃, and the described acylation reaction time is 25～35min.
7. the method for lipase-catalyzed online synthetic 6''-O-palmityl-naringin dihydrochalcone ester as claimed in claim 5, is characterized in that: described naringin dihydrochalcone is 1:7 with the ratio of the amount of substance of palmitinic acid vinyl acetate.
8. the method for lipase-catalyzed online synthetic 6''-O-palmityl-naringin dihydrochalcone ester as claimed in claim 6, is characterized in that: described acylation reaction temperature is 52 ℃, and the described acylation reaction time is 30min.
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| CN103184249A (en) * | 2011-12-31 | 2013-07-03 | 浙江工业大学 | Method for on-line synthesizing glucose-6-palmitate by lipase catalysis |
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| CN103184249A (en) * | 2011-12-31 | 2013-07-03 | 浙江工业大学 | Method for on-line synthesizing glucose-6-palmitate by lipase catalysis |
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| ATHINA KONTOGIANNI ET AL.: "Regioselective acylation of flavonoids catalyzed by lipase in low toxicity media", 《EUR. J. LIPID SCI. TECHNOL.》, vol. 103, no. 10, 31 October 2001 (2001-10-31), pages 655 - 660 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023242338A1 (en) * | 2022-06-17 | 2023-12-21 | Consejo Superior De Investigaciones Científicas (Csic) | A novel acylated derivate of phloretin and its use as antioxidant |
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