WO2017016175A1 - 一种基于施氏假单胞菌细胞催化的秦皮甲素羟基保护反应方法 - Google Patents
一种基于施氏假单胞菌细胞催化的秦皮甲素羟基保护反应方法 Download PDFInfo
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- WO2017016175A1 WO2017016175A1 PCT/CN2015/100037 CN2015100037W WO2017016175A1 WO 2017016175 A1 WO2017016175 A1 WO 2017016175A1 CN 2015100037 W CN2015100037 W CN 2015100037W WO 2017016175 A1 WO2017016175 A1 WO 2017016175A1
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/44—Preparation of O-glycosides, e.g. glucosides
- C12P19/60—Preparation of O-glycosides, e.g. glucosides having an oxygen of the saccharide radical directly bound to a non-saccharide heterocyclic ring or a condensed ring system containing a non-saccharide heterocyclic ring, e.g. coumermycin, novobiocin
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- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
- C12N1/205—Bacterial isolates
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- C12R2001/00—Microorganisms ; Processes using microorganisms
- C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
- C12R2001/38—Pseudomonas
Definitions
- the invention belongs to the field of biocatalysis and biomedical synthesis and control, and particularly relates to a method for protecting a hydroxysyl group of a quercetin based on Pseudomonas stutzer cells.
- Flavonoids are a series of important polyphenolic compounds formed by the interconnection of two benzene rings through three carbon atoms. They are widely found in almost all plants, especially vegetables and fruits; they are very good in medicine, food and cosmetics. Great application value. Flavonoids have a variety of biological activities including antioxidant activity, anti-inflammatory, anti-cancer, antibacterial, anti-allergic and anti-viral, however, due to their polyhydroxy structure, most of the flavonoid biological activity is limited by its low fat solubility or Water soluble. Hydroxyl groups located on the phenyl ring or glycoside backbone have an important effect on the biological and chemical activity of the flavonoids.
- Esterification of flavonoids is considered a promising method for increasing the solubility of flavonoids, thereby allowing flavonoids to exhibit more physiological activity.
- selective modification of flavonoid structure can not only improve physical and chemical properties, such as thermal stability and fat solubility; but also enhance its biological activity, such as antioxidant activity; antibacterial activity; cell penetration ability; weight loss and lowering Blood lipid function.
- Qinpi A hydrate is a kind of flavonoid, which has anti-inflammatory, antibacterial, anti-coagulation, analgesic and other activities. It is a growth inhibitor of Bacillus subtilis and also inhibits chemical carcinogenesis.
- the object of the present invention is to develop a protective quercetin hydrate 6'.
- the method of hydroxyl Optimum organic solvent, acyl donor, acyl donor and quercetin hydrate molar ratio, initial water content, Pseudomonas stutzer cell catalyst for Pseudomonas stutzeri cell acylation
- the amount, reaction temperature and oscillation speed are respectively 50% (v/v) isooctane-pyridine, vinyl propionate (VP), 20:1, 0% (v/v), 20g / L, 40°C and 180rpm
- the reaction yield can reach 98.9%.
- the reaction conditions had little effect on the regioselectivity of Pseudomonas stutzeri cells in the propionylation of quercetin hydrate, and the 6'-regional selectivity remained above 94%.
- the catalyst used in the method is simple and easy to operate, the reaction condition is mild, the yield is high, the initial velocity is fast, the selectivity of the hydroxyl protection region can be controlled, the selectivity of the conventional chemical method is low, the substrate utilization rate is low, and the product purity is low. , easy to generate by-products and other shortcomings.
- a method for hydroxyprotection of quercetin based on Pseudomonas stutzer cells comprising the following steps:
- the volume of the stoppered triangular flask of step 2) may be appropriately changed to enlarge or reduce the volume of the reaction system; 10mL ;
- the organic solvent is a single type of organic solvent or a mixed organic solvent, wherein a single type of organic solvent is pyridine, and the mixed organic solvent is acetonitrile - pyridine, tert-butanol - pyridine, tert-amyl alcohol - pyridine, tetrahydrofuran-pyridine, n-hexane-pyridine, isopropyl ether-pyridine, petroleum ether-pyridine or isooctane-pyridine; step 2) the organic solvent is 2 mL by volume 1:1 Isooctane-pyridine;
- the amount of the flavonoid hydrate in the step 3) is 10 mmol/L-90 mmol. Quercetin hydrate;
- the acyl donor is a vinyl propionate in an amount of 60 to 2400 mmol
- step 5 The water used is ultrapure water or double distilled water;
- the reaction temperature control method is a water bath shaker constant temperature oscillator water bath or a constant temperature shake flask air bath;
- reaction temperature in the step 7) is from 20 ° C to 50 ° C.
- the method specifically includes the following steps:
- reaction temperature range of Qinpi A hydrate hydroxy protection is 20 ° C ⁇ 50 ° C, water bath constant temperature oscillator reaction;
- reaction is oscillated in a water bath thermostat with a speed of 100 to 260 rpm.
- the volume of the triangular flask used in the reaction in step 2) is not limited to 10 mL.
- the reaction system may be appropriately enlarged or reduced; the organic solvent is a single type of organic solvent such as pyridine or a mixed organic solvent such as acetonitrile-pyridine, tert-butanol-pyridine, tert-amyl alcohol-pyridine, tetrahydrofuran-pyridine, n-hexane.
- the constant temperature oscillator is not limited to a water bath shaker, such as a gas bath condition such as a constant temperature shake flask.
- the Pseudomonas stutzer cell catalyst is used as a biocatalyst, and the reaction conditions are milder and more environmentally friendly than the chemical catalyst; the cost is lower than that of the enzyme catalyst.
- the catalyst preparation is simple and easy to operate, and the acyl donor vinyl propionate is commonly purchased, the initial speed is fast, the yield is high, the regional selectivity is high, and the low selectivity of the conventional chemical method is overcome, resulting in low substrate utilization.
- the product has low purity and is easy to produce by-products.
- the culture method of the strain slant medium, nutrient broth medium; the seed solution was cultured for 24 hours, and then inoculated into the fermentation medium, the inoculum amount was 2% (v/v), 180r/m, 30 °C, and cultured for 48 hours.
- Seed medium (w/v) was 1% glucose, 1% beef extract, 1% peptone, 0.5% K 2 HPO 4 , 0.02% MgSO 4 ⁇ 7H 2 O , 0.5% NaCl, pH 7.0 ⁇ 0.1; fermentation culture
- the base (w/v) is 0.5% soybean oil, 0.1% yeast extract, 0.5% (NH 4 ) 2 SO 4 , 0.1% K 2 HPO 4 , 0.02% MgSO 4 ⁇ 7H 2 O .
- Reaction conditions 2 mL of mixed organic solvent, 80 m of Pseudomonas stutzer cell catalyst, 60 mmol of quercetin hydrate, 1200 mmol of vinyl propionate, 40 ° C, 180 rpm, reaction for 24 h. a volume fraction, v/v.
- Reaction conditions 2 mL mixed organic solvent, 80 mg of Pseudomonas stutzer cell catalyst, 60 mmol quercetin hydrate , 1200 mmol of vinyl propionate, 40 ° C, 180 rpm, reaction for 24 h.
- Pseudomonas stutzer cell catalyst mixed evenly, placed in a water bath thermostat oscillator reaction (40 °C, 180r/min), timed 20 ⁇ l, diluted with 60% methanol-water mixed solution 50 times, mix well, centrifuge (15,000 r/min) for 15 min, take the supernatant 20 ⁇ L from the autosampler For high performance liquid chromatography analysis.
- the reaction results show that when the concentration of quercetin hydrate is low (5 ⁇ 250mmol/L) ), increasing the amount of substrate, the reaction rate is significantly increased; continue to increase the concentration of quercetin hydrate, the reaction rate tends to increase slowly; within the concentration range of the experimental investigation, the reaction rate has not been borne by a constant value, can be inferred 40
- the total cell catalyst input of mg/mL is still not saturated with the substrate in the reaction system.
- the reaction yield showed a slow downward trend and the regioselectivity decreased, but this concentration was always above 94%.
- the yield is up to 65% at the maximum; in the propionylation reaction, when the amount of the catalyst is more than 40 mg/mL, the amount of the catalyst is continuously increased, and the yield is hardly increased, and the maximum value is 98.6%. And the regioselectivity has changed little, always above 95%.
- the reaction results show that when the amount of distilled water added is small, the initial rate and yield of the acylation reaction decrease with the increase of the amount of distilled water added. After reaching a certain value, the amount of distilled water increases little, but the area does not change much.
- the selectivity is basically the same, always in More than 93%, it is considered that the amount of distilled water added to the reaction system is preferably 0%. At this time, the maximum yield is 96.3%.
- reaction results show that at 20 ⁇ 45 °C In the temperature range, with the increase of reaction temperature, the initial rate of propionylation of Pseudomonas stutzers whole cell quercetin hydrate increased. However, the yield of the reaction showed a typical first rise and then fall compared to the initial velocity. The optimum temperature is At 40 °C, the yield was 96.3%, respectively. Before the reaction temperature reached 40 °C, the yield increased with the increase of temperature, and when the temperature was higher than 40 °C, the yield decreased significantly, 6' - The effect of regioselectivity is small, both greater than 95%.
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Abstract
Description
有机溶剂 a | V 0 (mmol/L·h) | 产率 (%) | 6' - 区域选择性 (%) |
乙腈 - 吡啶 (1:3) | 1.40 | 18.21 | 96.40 |
叔丁醇 - 吡啶 (1:3) | 0.20 | 8.64 | 100 |
叔戊醇 - 吡啶 (1:3) | 0.83 | 31.04 | 97.02 |
四氢呋喃 - 吡啶 (1:3) | 1.26 | 39.99 | 97.63 |
正己烷 - 吡啶 (1:3) | 0.81 | 45.97 | 97.19 |
异丙醚 - 吡啶 (1:3) | 1.28 | 42.99 | 96.59 |
石油醚 - 吡啶 (1:3) | 0.53 | 49.09 | 96.63 |
异辛烷 - 吡啶 (1:3) | 1.67 | 58.04 | 98.80 |
不同比例的异辛烷 - 吡啶 | V0 (mmol/L·h) | 转化率 (%) | 6' 区域选择性 (%) |
0 | 16.23 | 97.78 | 0.97 |
10 | 36.52 | 97.95 | 1.45 |
15 | 44.79 | 98.65 | 1.96 |
20 | 54.99 | 98.74 | 2.43 |
25 | 57.57 | 99.92 | 2.71 |
30 | 73.66 | 97.82 | 3.59 |
35 | 86.20 | 97.91 | 3.91 |
40 | 90.53 | 97.53 | 4.09 |
45 | 91.98 | 97.64 | 5.87 |
50 | 97.02 | 96.92 | 6.43 |
Claims (9)
- 一种基于施氏假单胞菌细胞催化的秦皮甲素羟基保护反应方法,其特征在于,包括以下步骤:1)制作施氏假单胞菌细胞催化剂;2)在带塞三角瓶中加入有机溶剂;3)加入黄酮类水合物;4)加入酰基供体,形成有机溶剂反应体系;5)在有机溶剂反应体系中加入0~160μL水;6)加入施氏假单胞菌细胞催化剂使整个反应体系最终质量为20~160mg,混合均匀;7)置于水浴恒温振荡器反应,震荡速度为100~260rpm。
- 根据权利要求1所述的一种基于施氏假单胞菌细胞催化的秦皮甲素羟基保护反应方法,其特征在于步骤2)所述带塞三角瓶体积为10mL。
- 根据权利要求1所述的一种基于施氏假单胞菌细胞催化的秦皮甲素羟基保护反应方法,其特征在于步骤2)所述有机溶剂是单一种类有机溶剂或混合有机溶剂,其中单一种类有机溶剂是吡啶,混合有机溶剂是乙腈-吡啶、叔丁醇-吡啶、叔戊醇-吡啶、四氢呋喃-吡啶、正己烷-吡啶、异丙醚-吡啶、石油醚-吡啶或异辛烷-吡啶。
- 根据权利要求1所述的一种基于施氏假单胞菌细胞催化的秦皮甲素羟基保护反应方法,其特征在于步骤2)所述有机溶剂为2mL 体积比为1:1的异辛烷-吡啶。
- 根据权利要求1所述的一种基于施氏假单胞菌细胞催化的秦皮甲素羟基保护反应方法,其特征在于步骤3)所述黄酮类水合物为摩尔用量为10mmol-90mmol的秦皮甲素水合物。
- 根据权利要求1所述的一种基于施氏假单胞菌细胞催化的秦皮甲素羟基保护反应方法,其特征在于步骤4)所述酰基供体为60 ~2400 mmol的丙酸乙烯酯。
- 根据权利要求1中所述的一种基于施氏假单胞菌细胞催化的秦皮甲素羟基保护反应方法,其特征在于步骤5)所使用水为超纯水或双蒸水。
- 根据权利要求1中所述的一种基于施氏假单胞菌细胞催化的秦皮甲素羟基保护反应方法,其特征在于反应温度控制方法为水浴摇床恒温震荡器水浴或恒温摇瓶柜气浴。
- 根据权利要求1所述的一种基于施氏假单胞菌细胞催化的秦皮甲素羟基保护反应方法,其特征在于步骤7)所述反应温度为20℃~50℃。
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