CN114249847B - Preparation method of tuber mustard polysaccharide and application of tuber mustard polysaccharide in reducing blood fat and promoting intestinal Akkermansia bacteria proliferation - Google Patents
Preparation method of tuber mustard polysaccharide and application of tuber mustard polysaccharide in reducing blood fat and promoting intestinal Akkermansia bacteria proliferation Download PDFInfo
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- CN114249847B CN114249847B CN202111628078.4A CN202111628078A CN114249847B CN 114249847 B CN114249847 B CN 114249847B CN 202111628078 A CN202111628078 A CN 202111628078A CN 114249847 B CN114249847 B CN 114249847B
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- szechuan pickle
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0003—General processes for their isolation or fractionation, e.g. purification or extraction from biomass
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
- A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
- A23L33/125—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives containing carbohydrate syrups; containing sugars; containing sugar alcohols; containing starch hydrolysates
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/70—Carbohydrates; Sugars; Derivatives thereof
- A61K31/715—Polysaccharides, i.e. having more than five saccharide radicals attached to each other by glycosidic linkages; Derivatives thereof, e.g. ethers, esters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
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- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P3/00—Drugs for disorders of the metabolism
- A61P3/06—Antihyperlipidemics
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
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Abstract
The invention provides a preparation method of preserved szechuan pickle polysaccharide, which comprises the following steps: (1) preprocessing preserved szechuan pickle; (2) Adding pure water into the pretreated preserved szechuan pickle, and performing homogenization treatment; (3) Boiling the treated preserved szechuan pickle, performing suction filtration, collecting filter pulp, and extracting filter residues twice; (4) Mixing the filtrates, and concentrating under reduced pressure to obtain concentrated solution A; (5) Adding absolute ethyl alcohol into the concentrated solution A, stirring, standing, and performing suction filtration to obtain a filter cake; (6) Dissolving the filter cake with pure water, placing in a dialysis bag, repeatedly dialyzing, freezing and thawing, and performing suction filtration; (7) Concentrating the filtrate after suction filtration under reduced pressure to be viscous to obtain concentrated solution B; (8) And (4) drying the concentrated solution B in vacuum freeze drying. The invention adopts a water extraction and alcohol precipitation method to prepare the crude polysaccharide of the preserved szechuan pickle, removes protein and micromolecule impurities in the crude polysaccharide of the preserved szechuan pickle by using repeated freezing and thawing and dialysis technologies to obtain the preserved szechuan pickle polysaccharide, and clarifies monosaccharide composition of the preserved szechuan pickle polysaccharide through MPM-HPLC-UV analysis.
Description
Technical Field
The invention belongs to the technical field of preserved szechuan pickle deep processing, and particularly relates to a preparation method of preserved szechuan pickle polysaccharide and application of the preserved szechuan pickle polysaccharide in reducing blood fat and promoting intestinal Akkermansia bacteria proliferation.
Background
Currently, cardiovascular disease has become a major health-threatening factor in humans, with the number of deaths from the disease being the first to rank. In recent years, with the great abundance of living materials of people, people are very easy to obtain high-calorie food. Although the human body must take sufficient calories daily to maintain basic physiological activities, excessive intake of high calorie food for a long period of time induces hyperlipidemia (hyperlipidaemia), a typical cardiovascular disease, which is likely to progress to serious diseases such as diabetes, coronary heart disease, and arteriosclerosis without preventive intervention. In general, hyperlipidemia can be characterized by abnormally elevated blood total Triglyceride (TG), blood Total Cholesterol (TC), and blood low density lipoprotein cholesterol (LDL-C) levels, as well as abnormally reduced blood high density lipoprotein cholesterol (HDL-C) concentrations. In addition, unbalanced diet-induced hyperlipidemia is often accompanied by a dysregulation of the intestinal flora. The disordered intestinal flora not only further worsens hyperlipidemia, but also causes various diseases such as liver damage, gastroenteritis, cancer and the like. Therefore, there is a need to find a safe and effective blood lipid lowering and intestinal flora regulating agent.
Studies have shown that ingestion of high proportions of vegetable food is helpful in alleviating hyperlipidemia and intestinal flora disorders. A recent study showed that both salted and fresh mustard tuber were able to inhibit high fat diet-induced hyperlipidemia and intestinal flora disturbance. However, it has not been determined which ingredients of mustard tuber exert these health benefits.
Non-digestible polysaccharides (Non-digestible polysaccharides) are a class of macromolecular saccharide compounds in plant foods, which are polymerized from various sugar molecules. Although dietary polysaccharides cannot be digested and absorbed by human bodies, the dietary polysaccharides are excellent 'grains' of intestinal microorganisms and can provide abundant carbon sources for the intestinal microorganisms. Researches show that the dietary polysaccharide has various physiological functions, including reducing blood fat, promoting the proliferation of intestinal probiotics, losing weight, reducing blood sugar, protecting liver, resisting cancer, relaxing bowel, activating immunity and the like. However, polysaccharides derived from different diets also exhibit different major physiological activities. So far, no research has shown whether the polysaccharide of the tuber mustard has the physiological activity of maintaining the metabolic stability of blood fat and the balance of intestinal flora.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preparation method of hot pickled mustard tuber polysaccharide and application thereof in reducing blood fat and promoting the proliferation of Akkermansia enterobacteria.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of preserved szechuan pickle polysaccharide comprises the following steps:
(1) Preprocessing preserved szechuan pickle;
(2) Adding pure water into the pretreated preserved szechuan pickle, and performing homogenization treatment;
(3) Boiling the homogenized preserved szechuan pickle at 90-100 deg.C for 5-15min, suction filtering, collecting filtrate, and extracting the residue twice;
(4) Mixing the filtrates, and concentrating under reduced pressure at 60-80 deg.C and 10-150mbar to obtain concentrated solution A;
(5) Adding absolute ethyl alcohol into the concentrated solution A, stirring, standing, and performing suction filtration to obtain a filter cake;
(6) Dissolving the filter cake with pure water, placing in dialysis bag, repeatedly dialyzing for 8-10 times, repeatedly freezing and thawing at-30- -10 deg.C for 10-20 times, and vacuum filtering;
(7) Concentrating the filtrate obtained in step (6) at 60-80 deg.C under 10-150mbar under reduced pressure to obtain concentrated solution B;
(8) And (3) drying the concentrated solution B in vacuum freeze drying to obtain the preserved szechuan pickle polysaccharide.
Further, the specific operation of the preserved szechuan pickle pretreatment in the step (1) is as follows: taking fresh mustard tuber with stem tumor, removing old bark with high lignification degree, and cutting into 1-4 × 1-4 × 1-4mm mustard tuber granules.
Further, in the step (2), a shearing type homogenizer is adopted for homogenization treatment for 5-10min at 8000-15000 rad/min.
Further, the addition amount of the absolute ethyl alcohol in the step (5) is 5-15 times of the volume of the concentrated solution A.
Further, the dialysis bag in the step (6) is a dialysis bag of 8000-12000 Da.
Further, in the step (8), the concentrated solution B is dried at normal temperature under the vacuum degree of 0.2-1.5 mbar.
The prepared tuber mustard polysaccharide is applied to promoting intestinal Akkermansia bacteria proliferation.
The prepared tuber mustard polysaccharide is applied to reducing blood fat.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts a water extraction and alcohol precipitation method to prepare the crude polysaccharide of the preserved szechuan pickle, removes protein and micromolecule impurities in the crude polysaccharide of the preserved szechuan pickle by using repeated freezing and thawing and dialysis technologies to obtain the preserved szechuan pickle polysaccharide, and clarifies monosaccharide composition of the preserved szechuan pickle polysaccharide through MPM-HPLC-UV analysis.
2. The tuber mustard polysaccharide provided by the invention has the activity of remarkably improving the relative abundance of Akkermansia bacteria in intestinal tracts, and can be applied as a prebiotic.
3. The tuber mustard polysaccharide provided by the invention has the activity of obviously reducing the level of triglyceride in blood and the level of low-density lipoprotein cholesterol and increasing the level of high-density lipoprotein cholesterol in blood, and can be used as a blood fat reducing preparation.
4. The tuber mustard polysaccharide provided by the invention realizes the function of reducing blood fat by regulating and controlling the metabolism of LPE (18/0:0) and LPC (16/0:0) in a balanced manner and mediating and controlling signal paths such as PI3K-Akt, MAPK, foxO and the like, and researches show that the tuber mustard polysaccharide has the function of reducing blood fat and simultaneously promotes the proliferation of Akkermansia sp in intestinal tracts.
Drawings
FIG. 1 is a high performance liquid chromatogram of monosaccharide composition of tuber mustard polysaccharide;
FIG. 2 is a graph of inhibition of high fructose diet-induced lipid metabolism disorders by tuber mustard polysaccharide;
FIG. 3 is the metabolic fingerprint of mice fed with preserved szechuan pickle polysaccharide-regulated high fructose diet;
FIG. 4 is a graph of the correlation analysis of mouse liver transcriptome and metabolome;
FIG. 5 is a graph (genus level) of the composition of intestinal microorganisms in mice fed a polysaccharide-regulated high fructose diet of mustard tuber;
FIG. 6 is a diagram of environmental factor ReDundancy Analysis (RDA) on genus level for intestinal microorganisms.
Detailed Description
The process of the invention is described in detail below with reference to specific examples and illustrative figures.
1. Preparation of hot pickled mustard tuber polysaccharide
Example 1
A preparation method of preserved szechuan pickle polysaccharide comprises the following steps:
(1) Preprocessing preserved szechuan pickle: taking fresh mustard tuber with stem tumor, removing old skin with high lignification degree, and cutting into 2 × 2 × 2mm mustard tuber particles with a knife;
(2) Adding pure water into the pretreated preserved szechuan pickle, and adopting a shear type homogenizer to homogenize at 10000rad/min for 7min;
(3) Boiling the homogenized preserved szechuan pickle at 90 ℃ for 15min, performing suction filtration, collecting filtrate, and extracting filter residue twice;
(4) Mixing the filtrates, and concentrating under reduced pressure at 60 deg.C and 70mbar to obtain concentrated solution A;
(5) Adding 10 times volume (v/v) of absolute ethanol into the concentrated solution A, uniformly stirring, standing for 2h, and performing suction filtration to obtain a filter cake, wherein the filter cake is crude polysaccharide of the hot pickled mustard tuber;
(6) Dissolving the filter cake with pure water, placing in 10000Da dialysis bag, repeatedly dialyzing for 10 times to remove small molecular impurities in crude polysaccharide of preserved szechuan pickle, repeatedly freezing and thawing for 10 times at-20 deg.C to remove protein, and vacuum filtering;
(7) Concentrating the filtrate obtained in step (6) at 60 deg.C under 80mbar under reduced pressure to obtain concentrated solution B;
(8) And (3) placing the concentrated solution B at normal temperature, and carrying out freeze drying treatment under the vacuum degree of 0.7mbar to obtain the tuber mustard polysaccharide.
Example 2
A preparation method of preserved szechuan pickle polysaccharide comprises the following steps:
(1) Preprocessing preserved szechuan pickle: taking fresh mustard tuber with stem tumor, removing old skin with high lignification degree, and cutting into 1 × 2 × 4mm mustard tuber particles with a knife;
(2) Adding pure water into the pretreated preserved szechuan pickle, and adopting a shear type homogenizer to homogenize for 5min at 15000 rad/min;
(3) Boiling the homogenized preserved szechuan pickle at 100 ℃ for 5min, filtering, collecting filter pulp, and extracting filter residues twice;
(4) Mixing the filtrates, and concentrating under reduced pressure at 70 deg.C and 150mbar to obtain concentrated solution A;
(5) Adding 5 times volume (v/v) of absolute ethanol into the concentrated solution A, uniformly stirring, standing for 2h, and performing suction filtration to obtain a filter cake, wherein the filter cake is crude polysaccharide of the hot pickled mustard tuber;
(6) Dissolving the filter cake with pure water, placing in a dialysis bag of 8000Da, repeatedly dialyzing for 9 times to remove small molecular impurities in crude polysaccharide of mustard tuber, repeatedly freezing and thawing at-10 deg.C for 15 times to remove protein, and vacuum filtering;
(7) Concentrating the filtrate obtained in step (6) at 70 deg.C under 150mbar under reduced pressure to obtain concentrated solution B;
(8) And (3) placing the concentrated solution B at normal temperature, and carrying out freeze drying treatment under the vacuum degree of 0.2mbar to obtain the tuber mustard polysaccharide.
Example 3
A preparation method of preserved szechuan pickle polysaccharide comprises the following steps:
(1) Preprocessing preserved szechuan pickle: taking fresh mustard tuber with stem tumor, removing old skin with high lignification degree, and cutting into 4 × 2 × 1mm mustard tuber particles with a knife;
(2) Adding pure water into the pretreated preserved szechuan pickle, and adopting a shear type refiner to carry out homogenization treatment for 10min at 8000 rad/min;
(3) Boiling the homogenized preserved szechuan pickle at 95 ℃ for 10min, performing suction filtration, collecting filtrate, and extracting filter residue twice;
(4) Mixing the filtrates, and concentrating under reduced pressure at 80 deg.C and 10mbar to obtain concentrated solution A;
(5) Adding absolute ethanol with the volume (v/v) 15 times that of the concentrated solution A, uniformly stirring, standing for 2 hours, and performing suction filtration to obtain a filter cake, wherein the filter cake is crude polysaccharide of the hot pickled mustard tuber;
(6) Dissolving the filter cake with pure water, placing in a 12000Da dialysis bag, repeatedly dialyzing for 8 times to remove small molecular impurities in crude polysaccharide of mustard tuber, repeatedly freezing and thawing at-30 deg.C for 20 times to remove protein, and vacuum filtering;
(7) Concentrating the filtrate obtained in the step (6) at 80 deg.C under 10mbar under reduced pressure to obtain concentrated solution B;
(8) And (3) placing the concentrated solution B at normal temperature, and carrying out freeze drying treatment under the vacuum degree of 1.5mbar to obtain the tuber mustard polysaccharide.
2. Analysis of monosaccharide Components of the Hot pickled mustard tuber polysaccharides prepared by the invention
Hydrolyzing 10mg of tuber mustard polysaccharide with 2mol/L trifluoroacetic acid in boiling water for 6h, adding 50 mu L of 1-phenyl-3-methyl-5-pyrazolone methanol solution with the concentration of 0.5mol/L and 50 mu L of sodium hydroxide aqueous solution with the concentration of 0.3mol/L into the hydrolysis solution, and performing derivatization reaction at 70 ℃ for 1h; the reaction solution is adjusted in pH by 50 mu L of hydrochloric acid with the concentration of 0.3mol/L, and then is repeatedly extracted for 3 times by 1mL of chloroform, and the extracting solution is combined to be a sample to be detected. And (3) sampling 20 mu L of sample to be detected, and carrying out high performance liquid chromatography detection, wherein the wavelength of an ultraviolet detector is 250nm. During chromatographic elution, the mobile phase A is acetonitrile, and the mobile phase B is an aqueous solution containing 0.045% of monopotassium phosphate and 0.05% of triethylamine; the flow rate of the mobile phase is 1mL/min, and the gradient of the mobile phase B is 93-89-89% when the flow rate is 0-10-60 min. FIG. 1 is a high performance liquid chromatogram of monosaccharide composition of tuber mustard polysaccharide, with the ordinate being absorbance measured by an ultraviolet detector and the abscissa being chromatographic elution time. As can be seen from FIG. 1, the tuber mustard polysaccharide mainly comprises D-mannose, L-rhamnose, D-glucuronic acid, D-glucose, D-galactose and L-arabinose. Calculating the monosaccharide proportion of the hot pickled mustard tuber polysaccharide according to a standard curve: 1 to 2 percent of D-mannose, 0.4 to 0.9 percent of L-rhamnose, 3 to 4 percent of D-glucuronic acid, 58 to 70 percent of D-glucose, 6 to 9 percent of D-galactose and 19 to 24 percent of L-arabinose. Therefore, the preserved szechuan pickle polysaccharide prepared by the invention has a definite monosaccharide component.
3. Application of tuber mustard polysaccharide prepared by the invention in reducing blood fat and promoting intestinal Akkermansia bacteria proliferation
3.1 Design and method of animal experiments
After an adaptive feeding period of 1 week, 32 healthy male C57BL/6J mice (22 g. + -.1 g) were randomly divided into 4 groups of 8 mice each, namely a control group, a high fructose group, a low dose tuber mustard polysaccharide group and a high dose tuber mustard polysaccharide group. Fructose is widely used in beverages and bakery products as an important sweetener in the current food industry. However, numerous studies have demonstrated that prolonged over-intake of fructose, as is often done with large carbonated beverages, can lead to hyperlipidemia and intestinal flora disturbance. Therefore, the high fructose group, low dose tuber mustard polysaccharide group and high dose tuber mustard polysaccharide group mice drunk 30% fructose water, while the control group mice drunk tap water. Mice in control and high fructose groups were gavaged daily with 0.4mL of saline. Mice in the low-dose tuber mustard polysaccharide group and the high-dose tuber mustard polysaccharide group are gavaged with 0.4mL of tuber mustard polysaccharide aqueous solution with the dose of 25 mg/kg-bw and 25 mg/kg-bw every day. During the 8 consecutive weeks of treatment period, all mice were free to ingest standard rodent chow. After the last gavage management, fasting is performed for 12h. Mice were sacrificed after anesthesia and blood and colon contents were collected.
The mouse blood was centrifuged at 3000 Xg for 15min and the upper serum was collected. Serum was assayed for total triglyceride (BC 0625, solibao), total cholesterol (BC 1985, solibao), low density lipoprotein cholesterol (A113-1-1, nanjing established) and high density lipoprotein cholesterol (A112-1-1, nanjing established) levels using a commercial kit.
The microbial DNA in the intestinal contents of mice was extracted using the genomic DNA kit (Omega Biotek). The V3-V4 region of 16s rRNA from which DNA was extracted was amplified using 341F (5 '-CCTACGGGNGGCWGCAG-3') and 805R (5 '-GACTACHVGGGTATCTAATCC-3') as primers. And purifying the amplification product and then performing gene sequencing. Sequencing results species results are expressed as Feature (equivalent to 100% similarity) after removal of low quality reads.
3.2 Results of the experiment
FIG. 2 shows the inhibition of high fructose diet induced dyslipidemia by using tuber mustard polysaccharide, wherein A is the total triglyceride content in the serum of each group of mice, B is the low density lipoprotein cholesterol content in the serum of each group of mice, C is the high density lipoprotein cholesterol content in the serum of each group of mice, and D is the total cholesterol content in the serum of each group of mice. Control mice ingested tap water; the mice of the high fructose group, the low dose group and the high dose group of the preserved szechuan pickle polysaccharide all take 30 percent fructose water (w/v), the mice of the control group and the high fructose group take physiological saline by intragastric administration, the mice of the low dose group and the high dose group of the preserved szechuan pickle polysaccharide respectively take 25 mg/kg-bw and 50 mg/kg-bw of the preserved szechuan pickle polysaccharide by intragastric administration, in the figure, when different letters (a-c) are marked among data, the result difference is obvious, and P is less than 0.05. As can be seen from fig. 2, continuous intake of 30% fructose in mice resulted in significant reduction in serum total triglycerides, serum total cholesterol and serum ldl cholesterol levels, as well as a significant increase in serum hdl cholesterol levels. However, intragastric administration of high and low doses of the polysaccharides from mustard in high fructose aqueous feed mice inhibited the disturbance of blood lipid metabolism. In particular, high dose tuber mustard polysaccharide treatment effectively reduced serum total triglycerides and low density lipoprotein levels and effectively increased serum high density lipoprotein levels in the high fructose water fed mice. These results indicate that the tuber mustard polysaccharide can inhibit lipid metabolism disorder caused by high fructose diet in a mixed mode, and has the efficacy of reducing blood fat.
FIG. 3 is a fingerprint of the metabolism of mice fed with a preserved szechuan pickle polysaccharide-regulated high fructose diet, wherein the square boxes indicate the percentage of the metabolite in four groups, and each small solid plaque indicates 25%; black filled circles indicate that the difference is very significant, P <0.01; black filled circles indicate significant difference, P <0.05; control mice ingested tap water; the mice of the high fructose group, the low dose group and the high dose group of the preserved szechuan pickle polysaccharide all take 30 percent fructose water (w/v), the mice of the control group and the high fructose group take physiological saline by intragastric gavage, and the mice of the low dose group and the high dose group of the preserved szechuan pickle polysaccharide respectively take 25 mg/kg-bw and 50 mg/kg-bw of the preserved szechuan pickle polysaccharide by intragastric gavage. From the metabolomic analysis of figure 3, it was found that: the maintenance of lipid metabolism homeostasis in high fructose water fed mice by the brassica juncea polysaccharide is closely related to its inhibition of LPE (18.
FIG. 4 is a correlation analysis of mouse liver transcriptome and metabolome, wherein the abscissa represents metabolites, the ordinate represents mRNA, the red, white, blue blocks represent the correlation of metabolites with mRNA, the abscissa color bar represents the metabolite type, and the mice were controlled to take tap water; the mice of the high fructose group, the low dose group and the high dose group of the preserved szechuan pickle polysaccharide all take 30 percent fructose water (w/v), the mice of the control group and the high fructose group take physiological saline by intragastric gavage, and the mice of the low dose group and the high dose group of the preserved szechuan pickle polysaccharide respectively take 25 mg/kg-bw and 50 mg/kg-bw of the preserved szechuan pickle polysaccharide by intragastric gavage. From the metabonomics and transcriptomics analysis of figure 4, it is shown that signal pathways such as PI3K-Akt, MAPK, foxO and the like are key signal pathways for preventing the metabolic disturbance of high fructose water-induced lipid by tuber mustard polysaccharide.
FIG. 5 shows the composition (genus level) of intestinal microorganisms in mice fed with a high fructose diet regulated by tuber mustard polysaccharide, wherein the relative abundance is shown on the ordinate, which represents the percentage of a genus in the total amount; control mice ingested tap water; the mice of the high fructose group, the low dose group and the high dose group of the preserved szechuan pickle polysaccharide all take 30 percent fructose water (w/v), the mice of the control group and the high fructose group take physiological saline by intragastric gavage, and the mice of the low dose group and the high dose group of the preserved szechuan pickle polysaccharide respectively take 25 mg/kg-bw and 50 mg/kg-bw of the preserved szechuan pickle polysaccharide by intragastric gavage. As can be seen from FIG. 5, the dominant genera in the mouse gut are Akkermansia and Murebacteriaceae _ unclassified. Among them, akkermansia has been proved as intestinal probiotics by a great deal of research, and the relative abundance in the intestinal tract is in a significant negative correlation with diseases such as obesity, diabetes, cardiovascular diseases and inflammatory enteritis. The continuous 8-week intake of high fructose solution causes the relative abundance of Akkermansia bacteria in the colon of the mouse to be obviously reduced, and although the intake of low dose of tuber mustard polysaccharide while eating a large amount of fructose does not obviously improve the relative abundance of the Akkermansia bacteria in the colon of the mouse, the intake of high dose of tuber mustard polysaccharide can effectively improve the relative abundance of the Akkermansia bacteria in the colon of the high fructose fed mouse.
FIG. 6 is a genus-level environmental factor ReDundancy Analysis (RDA) of intestinal microorganisms, wherein each point in the figure represents a mouse sample, and the farther the distance between the two samples, the lower the similarity of the colony structures of the two samples; the arrow indicates an environmental factor, the length of which indicates the degree of correlation of the corresponding dietary treatment with the corresponding microorganism, and the longer the arrow indicates the greater the influence of the corresponding dietary factor on the corresponding microorganism; the included angle between the arrow connecting lines represents the correlation between the two, the acute angle represents positive correlation, and the obtuse angle represents negative correlation; control mice ingested tap water; the high fructose group, the low dose and the high dose tuber mustard polysaccharide group mice all take 30% fructose water (w/v); the control mice and the high fructose mice take physiological saline by gastric lavage; the mice of the low-dose and high-dose preserved szechuan pickle polysaccharide groups take 25 mg/kg-bw and 50 mg/kg-bw of preserved szechuan pickle polysaccharide respectively by intragastric administration. As can be seen from FIG. 6, the tuber mustard polysaccharide promotes the proliferation of Akkermansia bacteria, so that the tuber mustard polysaccharide treated mice are close to control mice, and the fact that the tuber mustard polysaccharide promotes the proliferation of the Akkermansia bacteria to maintain the intestinal microecological balance of the mice fed with high fructose diet is demonstrated, so that the host health is protected. These results indicate that the tuber mustard polysaccharide can promote the proliferation of intestinal Akkermansia probiotics.
Finally, 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 various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The preparation method of the preserved szechuan pickle polysaccharide is characterized by comprising the following steps of:
(1) Preprocessing preserved szechuan pickle; the specific operation is as follows: taking fresh stem mustard tuber, removing lignified old skin, and cutting into tuber mustard granules with length, width and height of 1-4X 1-4 mm;
(2) Adding pure water into the pretreated preserved szechuan pickle, and performing homogenization treatment;
(3) Boiling the homogenized preserved szechuan pickle at 90-100 deg.C for 5-15min, suction filtering, collecting filtrate, and extracting the residue twice;
(4) Mixing the filtrates, and concentrating under reduced pressure at 60-80 deg.C and 10-150mbar to obtain concentrated solution A;
(5) Adding absolute ethyl alcohol into the concentrated solution A, stirring, standing, and performing suction filtration to obtain a filter cake;
(6) Dissolving the filter cake with pure water, placing in dialysis bag with molecular weight of 8000-12000Da, repeatedly dialyzing for 8-10 times, repeatedly freezing and thawing at-30- -10 deg.C for 10-20 times, and vacuum filtering;
(7) Concentrating the filtrate obtained in step (6) at 60-80 deg.C under 10-150mbar under reduced pressure to obtain concentrated solution B;
(8) And (3) drying the concentrated solution B in vacuum freeze drying to obtain the preserved szechuan pickle polysaccharide.
2. The method for preparing preserved szechuan pickle polysaccharide according to claim 1, wherein the step (2) is carried out by homogenizing with a shear homogenizer at 8000-15000rad/min for 5-10min.
3. The process for preparing hot pickled mustard tuber polysaccharide according to claim 1, wherein the amount of the absolute ethyl alcohol added in the step (5) is 5 to 15 times the volume of the concentrated solution A.
4. The process for preparing hot pickled mustard tuber polysaccharide according to claim 1, wherein the concentrated solution B is dried at room temperature under a vacuum degree of 0.2-1.5mbar in step (8).
5. The application of the preserved szechuan pickle polysaccharide prepared by the method of 1~4 in preparing a medicine for promoting intestinal Akkermansia bacteria proliferation.
6. The application of preserved szechuan pickle polysaccharide, which is characterized in that the preserved szechuan pickle polysaccharide prepared by the method of 1~4 is applied to the preparation of hypolipidemic drugs.
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