CN116814501A - Bifidobacterium longum subspecies capable of relieving obesity and application thereof - Google Patents
Bifidobacterium longum subspecies capable of relieving obesity and application thereof Download PDFInfo
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- CN116814501A CN116814501A CN202310873429.0A CN202310873429A CN116814501A CN 116814501 A CN116814501 A CN 116814501A CN 202310873429 A CN202310873429 A CN 202310873429A CN 116814501 A CN116814501 A CN 116814501A
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- bifidobacterium longum
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Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- 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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- 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
- A23L33/135—Bacteria or derivatives thereof, e.g. probiotics
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- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K35/00—Medicinal preparations containing materials or reaction products thereof with undetermined constitution
- A61K35/66—Microorganisms or materials therefrom
- A61K35/74—Bacteria
- A61K35/741—Probiotics
- A61K35/744—Lactic acid bacteria, e.g. enterococci, pediococci, lactococci, streptococci or leuconostocs
- A61K35/745—Bifidobacteria
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- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K35/00—Medicinal preparations containing materials or reaction products thereof with undetermined constitution
- A61K35/66—Microorganisms or materials therefrom
- A61K35/74—Bacteria
- A61K35/741—Probiotics
- A61K35/744—Lactic acid bacteria, e.g. enterococci, pediococci, lactococci, streptococci or leuconostocs
- A61K35/747—Lactobacilli, e.g. L. acidophilus or L. brevis
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- A—HUMAN NECESSITIES
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- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
- A61P1/16—Drugs for disorders of the alimentary tract or the digestive system for liver or gallbladder disorders, e.g. hepatoprotective agents, cholagogues, litholytics
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- A—HUMAN NECESSITIES
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- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P3/00—Drugs for disorders of the metabolism
- A61P3/04—Anorexiants; Antiobesity agents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- 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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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- 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
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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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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
- C12R2001/00—Microorganisms ; Processes using microorganisms
- C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
Abstract
The invention relates to a bifidobacterium longum subspecies longum for relieving obesity and application thereof, wherein the bifidobacterium subspecies longum Bifidobacterium longum subsp.longum BL36 strain for relieving obesity is named as CGMCC No.24413. The strain has good gastrointestinal tract environmental tolerance, pathogenic bacteria inhibiting ability and cell adhesion ability, and can relieve obesity, reduce blood lipid level, reduce visceral index and reduce triglyceride level in liver.
Description
Technical Field
The invention belongs to the technical field of probiotics, relates to bifidobacterium longum subspecies for relieving obesity and application thereof, and in particular relates to a bifidobacterium subspecies Bifidobacterium longum subsp.longum BL36 strain, a culture containing the same, a probiotic containing the same, and application of the probiotic in preparation of products for preventing, relieving or treating obesity.
Background
With the continuous improvement of economic conditions and the continuous improvement of living standard, obesity is becoming one of the important factors for dangerous physical health. Obesity occurs because of an imbalance of energy, and either an increase in energy intake or a decrease in energy expenditure results in obesity. The excess energy is converted into white adipose tissue for storage. Obesity and chronic metabolic related diseases such as fatty liver, hyperlipidemia, type II diabetes and the like caused by obesity have higher incidence, and the diseases plagues people and become the world-focused problems. Long-term intake of high-fat, high-energy foods, sedentary exercise, etc. are all causes of obesity. For obesity, many methods of medicine and surgery have been developed, but adverse reactions and side effects are most of them, so healthier and safer non-drug treatments are being proposed.
For example, CN115067514a discloses the application of purple rice leaf in preparing health care food and/or health care product for relieving obesity, wherein the purple rice leaf is rich in dietary fiber, anthocyanin, alfalfa extract and other active ingredients, and can effectively control the weight of obese patients caused by high-fat diet, reduce fat accumulation capacity of adipose tissue and liver, thereby reducing the incidence risk of diseases caused by obesity. In addition, the use of probiotics to alleviate obesity is also a healthier and safer way, CN110684701a discloses a preservative number of CCTCC NO: the application of the lactobacillus plantarum S58 of M2019595 in the preparation of health products, foods, medicines and other products for relieving obesity not only expands the application range of the lactobacillus plantarum S58 and improves the utilization value of the lactobacillus plantarum S58, but also brings new hopes for treating obesity; CN116004472a discloses clostridium butyricum for relieving obesity and application thereof, clostridium butyricum CCFM1299 has been deposited in the microorganism strain collection in guangdong province at 2023, month 08, with the deposit number of GDMCC No:63125, after clostridium butyricum CCFM1299 is used for treating obese mice, the obesity of the mice can be relieved remarkably.
However, the probiotic preparations for relieving obesity in the prior art are limited, and the effect of relieving obesity of the preparations is still required to be further improved. Therefore, how to provide a probiotic preparation with good effect of alleviating or treating obesity, and without causing adverse reaction to patients during treatment, has become a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide bifidobacterium longum subspecies longum for relieving obesity and application thereof, in particular to a bifidobacterium subspecies longum Bifidobacterium longum subsp.longum BL36 strain, a culture containing the bifidobacterium subspecies longum BL36 strain, a probiotic containing the bifidobacterium subspecies longum BL36 strain and application of the bifidobacterium subspecies longum subspecies in preparation of products for preventing, relieving or treating obesity.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a bifidobacterium longum subspecies longum for alleviating obesity, which is named as a bifidobacterium subspecies longum Bifidobacterium longum subsp. Longum BL36 strain, and has a preservation number of CGMCC No.24413 and a preservation date of 2022, 02 and 21 days.
The invention separates and stores a new bifidobacterium longum subspecies capable of relieving obesity from faeces samples of breast-fed healthy infants, and names the bifidobacterium subspecies Bifidobacterium longum subsp.longum BL36 strain which has good gastrointestinal tract environmental tolerance capability, pathogenic bacteria inhibiting capability and cell adhesion capability, can relieve obesity, reduce blood lipid level, reduce organ index and reduce triglyceride level in liver. Therefore, the bifidobacterium longum subsp Bifidobacterium longum subsp.longum BL36 strain can be used for preparing products with the effects of preventing, relieving or treating obesity. BL36 strain is used as probiotics, and the safety is high, and drug resistance is not easy to generate.
The screening steps of the bifidobacterium longum subspecies longum BL36 strain related to the invention are as follows:
(1) Selecting a healthy breast-feeding healthy infant faeces sample, performing 10-time gradient dilution with physiological saline with the mass concentration of 0.9%, diluting for 3 times, coating on an MRS solid culture medium (medicines are purchased from Haibo organisms), culturing for 48 hours at 37 ℃, picking out bacterial colonies with different forms, then streaking and purifying on the surface of the MRS solid culture medium, picking out single colonies, performing expanded culture at 37 ℃ by using the MRS liquid culture medium, and then preserving by using glycerol with the mass concentration of 30%.
(2) And (3) carrying out in-vitro physiological characteristic test on the preserved single bacteria, screening out a single strain with the best gastrointestinal fluid tolerance (artificial simulation), HT-29 cell adhesion capability and bacteriostasis capability, and identifying and preserving the single strain.
In a second aspect, the present invention provides a culture of bifidobacterium longum subspecies longum for alleviating obesity, the method of preparation of said culture comprising: inoculating the bifidobacterium longum subspecies Bifidobacterium longum subsp.longum BL36 strain of the first aspect into a culture medium, and culturing at 30-40 ℃ (e.g. 30 ℃, 32 ℃, 35 ℃, 36 ℃,37 ℃, 38 ℃ and the like) for 18-42 hours (e.g. 18h, 19h, 20h, 21h, 22h, 23h, 24h, 30h, 36h, 40h, 42h and the like).
Other specific point values within the above numerical ranges are all selectable, and will not be described in detail herein.
The culture medium may be an MRS culture medium, and the formulation of the culture medium includes: peptone, beef extract, glucose, sodium acetate, yeast powder, diammonium hydrogen citrate, K 2 PO 4 ·3H 2 O、MgSO 4 ·7H 2 O、MnSO 4 L-cysteine, tween 80.
In a third aspect, the present invention provides a probiotic with the prevention, alleviation or treatment of obesity, the strains in said probiotic comprising the bifidobacterium longum subsp. Bifidobacterium longum subsp.longum BL36 strain of the first aspect.
The bifidobacterium longum subspecies Bifidobacterium longum subsp.longum BL36 strain related to the invention can be singly applied to related products or can be combined with other strains to be applied to the related products.
Preferably, the viable count of the bifidobacterium longum subspecies Bifidobacterium longum subsp.longum BL36 strain in the probiotics is not less than 1 multiplied by 10 9 CFU/mL or 1X 10 9 CFU/g, e.g. 1X 10 9 CFU/mL(CFU/g)、2×10 9 CFU/mL(CFU/g)、5×10 9 CFU/mL(CFU/g)、8×10 9 CFU/mL(CFU/g)、1×10 10 CFU/mL(CFU/g)、5×10 10 CFU/mL(CFU/g)、1×10 11 CFU/mL (CFU/g), etc., other specific values within the numerical range may be selected, and will not be described in detail herein.
Preferably, the strain in the probiotic agent further comprises lactobacillus casei Lactobacillus casei LC strain; the preservation number of the lactobacillus casei Lactobacillus casei LC strain is CGMCC No.15409, and the preservation date is 2018, 03 and 05.
The invention also creatively discovers that the BL36 strain can be used for preventing, relieving or treating obesity by being compounded with the lactobacillus casei Lactobacillus casei LC strain, has an effect remarkably superior to that of a single microbial inoculum or other compound formulas, and shows that the BL36 strain and the LC89 strain have a synergistic effect on the effects.
Preferably, the ratio of viable bacteria of the bifidobacterium longum subspecies Bifidobacterium longum subsp.longum BL36 strain to the lactobacillus casei Lactobacillus casei LC strain is 1:3-3:1, for example, 1:3, 1:2, 1:1, 2:1, 3:1, etc., and other specific values within the numerical range are selectable, which will not be described in detail herein.
Based on the potential interaction between BL36 strain and LC89 strain, the two strains have better synergistic effect when meeting the specific mass ratio relationship.
Preferably, the formulation of the probiotic agent comprises powder, capsule, tablet or granule.
Preferably, the probiotic agent further comprises a protective agent.
The protective agent is selected from one or a combination of at least two of skim milk, gelatin, dextrin, acacia, dextran, sodium alginate, polyvinylpyrrolidone, sucrose, lactose, trehalose, sorbitol or xylitol.
Preferably, the probiotic agent further comprises a prebiotic.
The prebiotic is selected from any one or a combination of at least two of fructo-oligosaccharide, galacto-oligosaccharide, xylo-oligosaccharide, isomalto-oligosaccharide, soy oligosaccharide, inulin, spirulina, arthrospira, coriolus versicolor polysaccharide, stachyose, polydextrose, alpha-lactalbumin or lactoferrin.
In a fourth aspect, the present invention provides the use of a long subspecies of bifidobacterium longum, or a culture as described in the second aspect, or a probiotic as described in the third aspect, in the manufacture of a product for the prevention, alleviation or treatment of obesity.
In a fifth aspect, the present invention provides the use of a long subspecies of bifidobacterium longum, or a culture, or a probiotic as described in the third aspect, in the manufacture of a product for reducing blood lipid levels.
In a sixth aspect, the present invention provides the use of a long subspecies of bifidobacterium longum, or a culture as described in the second aspect, or a probiotic as described in the third aspect, in the manufacture of a product for reducing liver index.
Compared with the prior art, the invention has the following beneficial effects:
the invention separates and stores a new bifidobacterium longum subspecies capable of relieving obesity from faeces samples of breast-fed healthy infants, and names the bifidobacterium subspecies Bifidobacterium longum subsp.longum BL36 strain which has good gastrointestinal tract environmental tolerance capability, pathogenic bacteria inhibiting capability and cell adhesion capability, can relieve obesity, reduce blood lipid level, reduce organ index and reduce triglyceride level in liver. Therefore, the bifidobacterium longum subsp Bifidobacterium longum subsp.longum BL36 strain can be used for preparing products with the effects of preventing, relieving or treating obesity. BL36 strain is used as probiotics, and the safety is high, and drug resistance is not easy to generate.
Detailed Description
In order to further describe the technical means adopted by the present invention and the effects thereof, the following describes the technical scheme of the present invention in combination with the preferred embodiments of the present invention, but the present invention is not limited to the scope of the embodiments.
The bifidobacterium longum subspecies Bifidobacterium longum subsp.longum BL36 strain is preserved in China general microbiological culture Collection center (CGMCC) No.24413, the preservation date is 2022, 02 month and 21 days, and the preservation address is North Chen Xiu No.1, 3 of the Korean region of Beijing city.
The lactobacillus casei Lactobacillus casei LC strain involved in the following is preserved in China general microbiological culture Collection center (CGMCC) with the preservation number of CGMCC No.15409 and the preservation date of 2018, 03 and 05 days, and the preservation address of the lactobacillus casei Lactobacillus casei LC strain is North Chen West Lu No.1, 3 in the Chaoyang area of Beijing city.
MRS solid medium used as follows: weighing 10g of peptone, 10g of beef extract, 20g of glucose, 2g of sodium acetate, 5g of yeast powder, 2g of diammonium hydrogen citrate and K 2 PO 4 ·3H 2 O 2.6g、MgSO 4 ·7H 2 O 0.1g、MnSO 4 0.05g, 20g of agar and 0.5g of L-cysteine are dissolved by deionized water, 1mL of Tween 80 is added, the volume is fixed to 1L, and after sterilization and cooling, the mixture is poured into a sterilized culture dish for standby.
MRS liquid medium used as follows: weighing 10g of peptone, 10g of beef extract, 20g of glucose, 2g of sodium acetate, 5g of yeast powder, 2g of diammonium hydrogen citrate and K 2 PO 4 ·3H 2 O 2.6g、MgSO 4 ·7H 2 O 0.1g、MnSO 4 0.05g and L-cysteine 0.5g, dissolved in deionized water, and addedAdding 1mL of Tween 80, fixing volume to 1L, sterilizing, and cooling.
The preparation method of the bacterial suspension comprises the following steps: inoculating the required strain into MRS liquid culture medium, culturing at 37deg.C for 24 hr for activation, and continuously activating for 2 times to obtain activating solution; inoculating the activating solution into MRS liquid culture medium according to the inoculum size of 2% (v/v), and culturing at 37 ℃ for 24 hours to obtain bacterial solution; centrifuging the bacterial liquid at 8000g for 10min, and re-suspending the bacterial body by using PBS.
Example 1
The method for screening the bifidobacterium longum subspecies for relieving obesity comprises the following steps:
(1) Selecting a healthy breast-feeding healthy infant faeces sample, performing 10-time gradient dilution with physiological saline with the mass concentration of 0.9%, diluting for 3 times, coating on an MRS solid culture medium (medicines are purchased from Haibo organisms), culturing for 48 hours at 37 ℃, picking out bacterial colonies with different forms, then streaking and purifying on the surface of the MRS solid culture medium, picking out single colonies, performing expanded culture at 37 ℃ by using the MRS liquid culture medium, and then preserving by using glycerol with the mass concentration of 30%.
(2) In vitro physiological characteristic test is carried out on a plurality of preserved single strains, and a single strain with the best gastrointestinal fluid tolerance (artificial simulation), HT-29 cell adhesion capability and bacteriostasis capability is screened out, which comprises the following specific steps:
(2.1) evaluation of environmental resistance of strains to gastrointestinal tract:
gastric juice is simulated manually: preparing 0.5% NaCl solution, adding 0.3% pepsin, adjusting pH to 2.5 with 1mol/L HCl, dissolving completely, and filtering with 0.22 μm microporous membrane for sterilization.
Manually simulating intestinal juice: preparing 0.5% NaCl solution, adding 0.1% trypsin, adjusting pH to 8.0 with 0.1mol/L NaOH, dissolving completely, and filtering with 0.22 μm microporous membrane for sterilization.
And (3) carrying out activation culture on all the preserved strains for 2 generations under anaerobic conditions, centrifuging the activated bacterial liquid, and collecting bacterial bodies. And respectively taking 0.4mL of thallus suspension, respectively inoculating 1.6mL of prepared simulated artificial gastric fluid with pH of 2.5 and simulated artificial intestinal fluid with pH of 8.0, uniformly mixing, digesting at 37 ℃, respectively taking the digestive juice of 0h and 3h to detect the number of viable bacteria, and calculating the survival rate. Wherein, the survival rate (%) =b/a×100% of the strain, wherein a represents the number of viable bacteria (CFU/mL) of the strain for 0h, and B represents the number of viable bacteria (CFU/mL) of the strain for 3 h. Each experiment was performed in 3 replicates.
(2.2) evaluation of adhesion ability of Strain to HT-29 cells:
adjusting the concentration of digested HT-29 cells to 10 5 cell/mL, 1mL per well, inoculated into a 12-well cell culture plate, at 5% CO 2 Incubating in a concentration incubator until cells grow to a monolayer, washing twice with sterile PBS, digesting one well with pancreatin, and counting cells with a blood cell counting plate; 1mL of each bacterial suspension is added into other holes respectively, and the concentration of CO is 5% 2 After incubation for 2h at 37 ℃ in an incubator, washing cells with sterile PBS for 5 times, removing non-adhered bacterial suspension, adding 0.2mL of pancreatin-EDTA buffer solution into each hole to digest the cells for 5min, adding 0.8mL of PBS after digestion, blowing evenly, and taking bacterial liquid for dilution and living bacterial counting. Since lactobacillus rhamnosus LGG is a commercial strain with better adhesion accepted in the industry, each experiment was performed in 3 replicates with it as a control strain.
(2.3) evaluation of the ability of the Strain to inhibit pathogenic bacteria:
the antagonism of the strain against the common pathogenic bacteria escherichia coli, salmonella and staphylococcus aureus was examined. The antagonistic strain is inoculated into an anaerobic glass tube of MRS liquid culture medium according to 2% (V/V) by adopting an oxford cup method, and is subjected to stationary culture at a constant temperature of 37 ℃ for 12 hours. Pathogenic strains such as escherichia coli, salmonella and staphylococcus aureus are respectively inoculated into a liquid beef extract peptone culture medium, cultured overnight at 37 ℃ with a constant temperature of 250rpm in a shaking table, and then pathogenic bacteria suspension is prepared. Cooling MRS solid culture medium to about 55deg.C, mixing with pathogenic bacteria suspension at a certain ratio to make the number of viable bacteria of the system be 10 6 CFU/mL, then rapidly pouring the culture medium into a flat plate in which an oxford cup is placed in advance, taking out the oxford cup after the culture medium is cooled and solidified, injecting 200 mu L of antagonistic strain bacteria liquid into each hole, lightly covering the flat plate, then placing the flat plate in a constant temperature incubator at 37 ℃, observing after culturing, and measuring the diameter of a bacteriostasis ring by using a vernier caliper. Each experiment was performed in 3 replicates.
Example 2
In this example, the strains obtained by screening in example 1 were subjected to physiological and biochemical characterization and 16S rRNA molecular biology identification as follows:
(1) The physiological and biochemical characteristics are shown in table 1 below:
TABLE 1
(2) 16S rRNA molecular biology identification:
taking out the strain preserved at-80 deg.C, inoculating into a centrifuge tube filled with 20mL MRS liquid culture medium according to 2% ratio, culturing at 37 deg.C for 18h, centrifuging at 8000rpm for 10min, removing supernatant, and collecting bacterial suspension. Extracting genome of the strain, adding bacterial universal primer for PCR amplification, and delivering the amplified product to China academy of sciences microbiological study for sequencing and identification.
The strain is subjected to sequencing analysis, and the 16S rRNA gene sequence and the tuf gene sequence of the strain are respectively shown as SEQ ID No.1 and SEQ ID No. 2.
SEQ ID No:1:
AGGGACCTAAGCGCCTCACTTAGACGGCTCCATCCCACAAGGGGTTAGGCCACCGGCTTCGGGTGCCCACTTTCATGACTTGACGGGCGGTCTCTACAAGGCCCGGGAACGCATTCACCGCGACGTTGCAGATTYCGCGATTACTAGCGACTCCGCCTTCACGCAGTCGAGTTGCAGACTGCGATCCGAACTGAGACCGGTTTTCAGGGATCCGCTCCGCGTCGCCGCGTCGCATCCCGTTGTACCGGCCATTGTAGCATGCGTGAAGCCCTGGACGTAAGGGGCATGATGATCTGACGTCATCCCCACCTTCCTCCGAGTTAACCCCGGCGGTCCCCCGTGAGTTCCCGGCATAATCCGCTGGCAACACGGGGCGAGGGTTGCGCTCGTTGCGGGACTTAACCCAACATCTCACGACACGAGCTGACGACGACCATGCACCACCTGTGAACCCGCCCCGAAGGGAAGCCGTACTCTACGACCGTCGGGAACATGTCAAGCCCAGGTAAGGTTCTTCGCGTTGCATCGAATTAATCCGCATGCTCCGCCGCTTGTGCGGGCCCCCGTCAATTTCTTTGAGTTTTAGCCTTGCGGCCGTACTCCCAGGCGGGATGCTTAACGCGTTAGCTCCGACACGGAACCCGTGGAACGGGCCCCACATCCAGCATCCACCGTTTACGGCGTGGACTACCAGGGTATCTAATCCTGTTCGCTCCCCACGCTTTCGCTCCTCAGCGTCAGTAACGGCCCAGAGACCTGCCTTCGCCATTGGTGTTCTTCCCGATATCTACACATTCCACCGTTACACCGGGAATTCCAGTCTCCCCTACCGCACTCAAGCCCGCCCGTACCCGGCGCGGATCCACCGTTAAGCGATGGACTTTCACACCGGACGCGACGAACCGCCTACGAGCCCTTTACGCCCAATAATTCCGGATAACGCTTGCACCCTACGTATTACCGCGGCTGCTGGCACGTAGTTAGCCGGTGCTTATTCAACGGGTAAACTCACTCTCGCTTGCTCCCCGATAAAAGAGGTTTACAACCCGAAGGCCTCCATCCCTCACGCGGCGTCGCTGCATCAGGCTTGCGCCCATTGTGCAATATTCCCCACTGCCTCCCGTAGGAGTCTGGGCCCGTATCTCAGTCCCAATGTGGCCGGTCGCCCTCTCAGGCCGGCTACCCGTCGAAGCCACGGTGGGCCGTTACCCCGCCGTCAAGCTGATAGGACGCGACCCCATCCCATACCGCGAAAGCTTTCCCAGAAGACCATGCGATCAACTGGAGCATCCGGCATTACCACCCGTTTCCAGGAGCTATTCCGGTGTATGGGGCAGGTCGGTCACAGCATTACTCACCCGTTCGCCACTCTCACCACCAAGCAAGCTTGATGGATCCCGTTCGACTGCATGTGTAAGCACCCTGCGGCCTC。
SEQ ID No:2:
TCAGGCCTTCCTCCATAGCGATGGGCTGAATCAGCTCAACGGTGAAGGTAGCGTGGTCGCCCGGCTGAACCATCTCGACGCCTTCCGGCAGCTCGATGACGCCGGTGACGTCGGTGGTGCGGAAGTAGAACTGCGGACGGTAGTTGGAGAAGAACGGCGAGTGACGGCCGCCTTCGTCCTTGGTCAGCACGTAGACTTCGCCCTCGAACTTGGTGTGCGGGGTGACGGAGCCCGGCTTGGCCACAACCTGGCCACGCTCGACATCGTCACGGCCGAGACCACGCAGAAGCAGACCGGTGTTGTCGCCAGCCTCGCAGGCGTCCATGGTCTTGTGGAAGGTCTCGATGGAGGTGACGGTGGTCTGCTGGGTCGGACGGATACCAACGATCTCGACCGGGGTGTTGACGGCCAGCTGGCCACGCTCGACACGACCGGTGACAACGGTACCACGGCCGGAGATGGTGAAGACGTCCTCGATCGGCATCAGGAACGGCTTGTCCAGGTCGTGAACCGGGGTCGGGATGTAGTCGTCGACAGCGTCCATGAGGTCCTTAACGGACTGGACCCACTTCTCGTGGTCCGGAGCGTCGTCGTGCAGAGCACCGTAAGCGGAGGTGTGGATGACCGGGCAGTCACGGTCGAAGCCGTTCTCGTCGAGGAGGTCGCGGACCTCTTCTTCGACGAGCTCGATGAGCTCTTCATCGTCGACCATGTCGCACTTGTTCAGGGCGACGAGGATCTTCGGAACGCCAACCTGACGGGCGAGCAGCACGTGCTCGCGAGTCTGGGCCATCGGGCCGTCGGTGGCGGGCCACAACGAGGATAGCGCCATCCATCTGGGCAGCACCGGTAATCATGTTCTTCACGAAGTCGGCGTGGCCCGGGCAGTCGACGTGAGCGTAGTGACGCTTCTCGGTCTGGTACTCGATGTGGGCGATGTTGATGGTGA。
The sequences obtained by sequencing were analyzed with reference to the "Bojie's system bacteriology handbook" and International Journal of Systematic and Evolutionary Microbiology related research papers, and the results showed that the strain was indeed Bifidobacterium longum subsp.
Example 3
In this example, the culture conditions of bifidobacterium longum subspecies longum BL36 were optimized as follows:
inoculating Bifidobacterium longum subspecies BL36 into MRS liquid culture medium, respectively culturing at different temperatures of 20-45deg.C for 48 hr, and measuring OD600 value of the culture solution by enzyme-labeling instrument at intervals during culturing, and the results are shown in Table 2.
TABLE 2
The result shows that the bifidobacterium longum subspecies BL36 grows optimally at 30-40 ℃, and the growth stability period can be reached after 24-42h of culture.
Example 4
This example demonstrates the effect of bifidobacterium longum subspecies longum BL36 on body weight, lees coefficient and body fat rate of obese mice, as follows:
(1) Test animals: the SPF-class male mice are selected to be 56, the day-old mice are 21-28d, the weight is 22+ -2 g, and the animal house (room temperature: 22-25 ℃, humidity: 40-60%, illumination 10+ -0.5 h) is adaptively fed with common feed for one week (free diet and drinking water).
(2) Grouping: after adaptive feeding, mice were randomly divided into 7 groups: blank (Control), model (Model), BL36, LC89, BL36 and LC89 combined (combination 1), ATCC55813 and LC89 combined (combination 2), BL36 and ATCC393 combined (combination 3), 8/group.
(3) Feeding: the blank group was given normal feed and the other groups were given high fat feed for feeding (both feeds were from the same company). The water and litter were changed twice a week, and the high fat diet was changed daily to avoid fat oxidation that would give the odor impression that the mice eat.
(4) Gastric lavage: the mice in both the blank and model groups were perfused with 0.2mL of sterile physiological saline daily for 8 weeks. BL36 mice were perfused with 0.2mL of 1X 10 per day 10 CFU/mL long doubleThe bifidobacterium subspecies longum BL36 bacterial liquid lasts for 8 weeks. LC89 group mice were perfused daily with 0.2mL of 1X 10 10 CFU/mL of Lactobacillus casei LC89 broth was maintained for 8 weeks. Mice from the BL36 and LC89 combination group were gavaged daily at a concentration of 0.1mL of 1X 10 10 CFU/mL of Bifidobacterium longum subspecies longum BL36 and 0.1mL concentration were 1X 10 10 CFU/mL of the mixed bacteria solution of the cheese bacillus LC89 was continued for 8 weeks. The 0.1mL daily gavage concentration of ATCC55813 and LC89 combination was 1X 10 10 CFU/mL ATCC55813 and 0.1mL concentration is 1X 10 10 CFU/mL of the mixed bacteria solution of the cheese bacillus LC89 was continued for 8 weeks. BL36 and ATCC393 combination groups were 1X 10 at a daily gavage of 0.1mL 10 CFU/mL of Bifidobacterium longum subspecies longum BL36 and 0.1mL concentration were 1X 10 10 CFU/mL ATCC393 mixed liquor was continued for 8 weeks.
(5) The mice were fed for 8 weeks, the feeding condition of the mice was recorded every week, the body weight of the mice and the body length (distance from the tip of the nose to the anus) of the mice were measured, and the Lees coefficient was calculated; the epididymal and perirenal adipose tissues were removed, and the body fat rate was measured and calculated according to the following calculation formula.
The weekly changes in body weight of the mice are shown in Table 3.
TABLE 3 Table 3
The results of weight gain, lees coefficient, body fat rate after 8 weeks for each group of mice are shown in table 4.
TABLE 4 Table 4
From the results in tables 3 and 4, the mice in the model group had the most weight gain, which was significantly higher than the other groups; the weight gain of mice in combination with group 1 was minimal in the five intervention groups. The Lees coefficient is a value reflecting the degree of obesity in humans or animals, with a larger value indicating a higher degree of obesity in individuals. The Lees coefficient value of the model group is the largest in all test groups, which indicates that the mice are obese; this was substantially consistent with the weight gain of the mice during the trial; the mice in the five intervention groups had less Lees coefficients than the model group. In addition to observing the body weight and Lees coefficient of mice, body fat rate is also an important indicator for measuring the obesity degree of mice. The body fat rate of mice in the model group is highest, the body fat rate of mice in other groups is lower than that of mice in the model group, and the body fat rate of mice in the combined 1 group in the five intervention groups is lowest. Taken together, the BL36 strain according to the present invention was found to be very effective in alleviating obesity in mice based on the data of weight gain, lees coefficient and body fat rate in mice.
Example 5
This example demonstrates the effect of bifidobacterium longum subspecies longum BL36 on blood lipid levels in obese mice, as follows:
example 4 mice were perfused with blood for 8 weeks, whole blood was obtained by eye blood collection, standing at 20 ℃ for 2 hours, at 4 ℃ for 3000r/min, centrifuging for 10min, and the supernatant serum was collected to measure the concentrations of Total Cholesterol (TC), triglyceride (TG), low Density Lipoprotein (LDL) and High Density Lipoprotein (HDL) in the serum of the mice. The four blood lipid kits produced by Nanjing's established bioengineering study were used for measurement, and the results are shown in Table 5 below:
TABLE 5
As can be seen from the data in table 5, the mice were on a high-fat diet for a long period of time, resulting in excessive fatty acid production in the body, thereby promoting the increase of TG and TC contents in serum; if the mice are obese for a long period of time, in vivo lipase accelerates the treatment, resulting in a decrease in HDL content and an increase in LDL content. The data in the above table show that the TG, TC and LDL levels in the mice in the model group are all significantly increased, while the HDL levels are significantly reduced, compared to the control group; the five intervention groups all improved to different degrees, the effect of the combined 1 group was more obvious compared with the LC89 and BL36 groups, and the effect was more similar to that of the control group. The results show that the BL36 strain can remarkably improve the blood lipid rise caused by high-fat diet.
Example 6
This example demonstrates the effect of bifidobacterium longum subspecies longum BL36 on organ index in obese mice, as follows:
example 4 after 8 weeks of gastric lavage, the heart, kidney, liver and spleen of the mice were removed after blood was taken out from the eyeballs, washed with sterile physiological saline, dried by suction with filter paper, weighed, and the organ index was measured, and calculated according to the following formula. The results are shown in Table 6 below.
TABLE 6
As can be seen from the data in Table 6, the growth status of mice can be reflected by organ indexes. Long-term eating of high-fat diet can cause fat cavity in the liver of the mice and increase liver quality. The data in the above table show that liver index is obviously increased due to the ingestion of high-fat feed by mice; while the other intervention groups had significantly reduced organ index compared to the model group.
Example 7
This example demonstrates the effect of bifidobacterium longum subspecies longum BL36 on Triglycerides (TG) in the liver of obese mice, as follows:
example 6 mouse livers were taken out, 0.1g was weighed, sterile physiological saline was added in a ratio of 1:9, grinding was performed under ice bath conditions, at 4 ℃ and 4000r/min, centrifugation was performed for 10min, the supernatant was taken out and placed in a new EP tube, and the measurement was performed using a triglyceride kit produced by the institute of bioengineering, built in tokyo, and the measurement results were shown in table 7 below.
TABLE 7
The liver is an important place for synthesizing triglyceride, and when the triglyceride is excessively synthesized, the triglyceride cannot be transported in time and is accumulated in the liver. From the data in Table 7, it can be seen that the mice eat high-fat feed for a long period of time, and the accumulation of TG in the liver of the mice in the model group is significantly greater than that in the blank group and other intervention groups.
The applicant states that the present invention is illustrated by the above examples as a bifidobacterium longum subspecies longum for alleviating obesity and its use, but the present invention is not limited to, i.e. it is not meant that the present invention must be practiced in dependence upon, the above examples. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Claims (10)
1. The long bifidobacterium subspecies for relieving obesity are named as Bifidobacterium longum subsp.longum BL36 strain, the preservation number is CGMCC No.24413, and the preservation date is 2022, 02 and 21.
2. A culture of bifidobacterium longum subspecies longum for alleviating obesity, characterized in that the method of preparation of said culture comprises: inoculating the bifidobacterium longum subspecies Bifidobacterium longum subsp.longum BL36 strain in the culture medium and culturing at 30-40 ℃ for 18-42h.
3. A probiotic with the prevention, alleviation or treatment of obesity, characterized in that the strain in the probiotic comprises the bifidobacterium longum subsp. Bifidobacterium longum. Longum BL36 strain of claim 1.
4. A probiotic according to claim 3, characterized in that the viable count of the bifidobacterium longum subsp Bifidobacterium longum subsp longum BL36 strain in the probiotic is not lower than 1 x 10 9 CFU/mL or 1X 10 9 CFU/g。
5. The probiotic according to claim 3 or 4, characterized in that the strain in the probiotic further comprises lactobacillus casei Lactobacillus casei LC strain 89; the preservation number of the lactobacillus casei Lactobacillus casei LC strain is CGMCC No.15409, and the preservation date is 2018, 03 and 05.
6. The probiotic according to claim 5, characterized in that the ratio of viable count of bifidobacterium longum subsp. Bifidobacterium longum subsp.longum BL36 strain to lactobacillus casei Lactobacillus casei LC strain is 1:3-3:1.
7. The probiotic according to any one of claims 3 to 6, characterized in that the formulation of the probiotic comprises a powder, a capsule, a tablet or a granule;
preferably, the probiotic agent also contains a protective agent;
preferably, the probiotic agent further comprises a prebiotic.
8. Use of a long subspecies of bifidobacterium longum as claimed in claim 1, or a culture as claimed in claim 2, or a probiotic as claimed in any one of claims 3 to 7, in the manufacture of a product for the prevention, alleviation or treatment of obesity.
9. Use of a bifidobacterium longum subspecies longum as claimed in claim 1, or a culture as claimed in claim 2, or a probiotic as claimed in any one of claims 3 to 7, in the manufacture of a product for reducing blood lipid levels.
10. Use of a long subspecies of bifidobacterium longum as claimed in claim 1 or a culture as claimed in claim 2 or a probiotic as claimed in any one of claims 3 to 7 in the manufacture of a product to reduce liver index.
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