CN116814464B - Fermented lactobacillus mucilaginosus JF5 and application thereof in preparation of lipid-reducing and digestion-aiding foods and medicines - Google Patents

Fermented lactobacillus mucilaginosus JF5 and application thereof in preparation of lipid-reducing and digestion-aiding foods and medicines Download PDF

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CN116814464B
CN116814464B CN202310235233.9A CN202310235233A CN116814464B CN 116814464 B CN116814464 B CN 116814464B CN 202310235233 A CN202310235233 A CN 202310235233A CN 116814464 B CN116814464 B CN 116814464B
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lactobacillus
mucilaginosus
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fermentum
limosilactobacillus
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CN116814464A (en
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陆勇军
葛振煌
许敏青
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Guangdong Yuechuang Biotechnology Co ltd
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Abstract

The invention belongs to the technical field of probiotics and application thereof, and particularly relates to a lactobacillus mucilaginosus JF5 strain and application thereof in preparation of lipid-reducing and digestion-aiding foods and medicines. In order to further develop and utilize the probiotics function of the fermented lactobacillus, the invention separates a fermented lactobacillus JF5 strain from pickle samples, and the strain has various functions of producing protease, cellulase, gamma-aminobutyric acid, hyaluronic acid, inhibiting alpha-glucosidase activity, inhibiting acetylcholinesterase activity and the like. Therefore, the strain has the beneficial effects of promoting the digestion and absorption of protein food to improve protein allergy, promoting the absorption of cellulose to improve constipation, resisting depression and alcohol, resisting aging and crease, reducing blood sugar, promoting intestinal absorption and peristalsis and the like, and has important application value and economic value.

Description

Fermented lactobacillus mucilaginosus JF5 and application thereof in preparation of lipid-reducing and digestion-aiding foods and medicines
Technical Field
The invention belongs to the technical field of probiotics and application thereof, and particularly relates to a lactobacillus mucilaginosus JF5 strain and application thereof in preparation of lipid-reducing and digestion-aiding foods and medicines.
Background
Lactobacillus fermentum (limosilactis), also known as lactobacillus fermentum, gram positive bacilli, facultative anaerobism. The lactobacillus fermentum has higher tolerance and can adapt to the environment with low acid and high bile salt in human intestinal tracts. In addition, the lactobacillus fermentum also has higher safety and genetic stability, is one of the earliest planted probiotics in human intestinal tracts, can continuously change along with the growth of human ages and the change of human bodies, and can influence the health of human bodies when the number of the probiotics is lower than a normal value.
Lactobacillus fermentum is widely present in the intestinal tract of humans and animals and is excreted with faeces. Lactobacillus mucilaginosus is a part of the normal flora of the human body, which is one of the important components of the normal microbial system of the intestinal tract and accompanies the host for life, and has important significance for maintaining the microecological balance of the intestinal tract. Meanwhile, as probiotics in intestinal flora, the fermented mucus lactobacillus is also edible lactobacillus, has no toxic or side effect, can play a role in helping intestinal peristalsis, and can also enhance the digestion capability of human bodies, improve immunity and the like. At present, fermented lactobacillus mucilaginosus has become a hot spot of research as a probiotic lactobacillus mucilaginosus with great potential and is being continuously used to make probiotic preparations suitable for human and animals.
Currently, different strains of lactobacillus fermentum have been reported to have different probiotic functions: (1) enhancing host immunity. For example, the lactobacillus mucilaginosus CECT5716 can effectively prevent, relieve and treat common uncomfortable symptoms of pregnant women and lactating women, help the fetus to pre-establish an intestinal immune protection system before birth, and remarkably improve the immunity and the resistance of infants. (2) antibacterial: preventing respiratory tract infection, reducing incidence of common cold, cough, etc., and preventing vaginal infection. (3) improving intestinal health: promoting health of gastrointestinal digestive system, reducing harmful substances in intestinal tract, and relieving constipation. (4) Helping the fetus build an autoimmune system, and laying a foundation for the innate immunity of the baby. (5) Effectively preventing and treating mastitis, relieving mammitis, relieving breast soreness, relieving pain, promoting breast health, and relieving tension and anxiety.
It can be seen that the diversity of sources of lactobacillus mucilaginosus results in genetic and functional diversity. However, the current studies on the separation and identification, the probiotics characteristics and the metabolic mechanism of the lactobacillus fermentum are still relatively few, which also affects the further development and utilization of the lactobacillus fermentum to a certain extent. Therefore, it is necessary to make lactobacillus mucilaginosus function better according to different sources of the lactobacillus mucilaginosus, such as determining the efficacy according to the functions of the strain or the probiotics metabolite, and defining the application prospect. In conclusion, the research and application of the probiotic fermented lactobacillus mucilaginosus have wider development space.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention separates a lactobacillus mucilaginosus (JF 5) strain from pickle samples, and the strain has the functions of cellulase activity, hyaluronic acid production, alpha-glucosidase activity inhibition and the like, and has great potential application value.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the first aspect of the present invention provides a lactobacillus fermentum JF5 strain, which is deposited with the chinese collection of typical cultures at 10 months 4 of 2022, with accession number: cctccc No. M20221511; the 16S rDNA complete sequence of the lactobacillus mucilaginosus JF5 strain is shown in SEQ ID No: 1.
In a second aspect the invention provides the use of a lactobacillus fermentum JF5 strain according to the first aspect for the production of cellulases.
The research shows that the probiotics fermented lactobacillus mucilaginosus JF5 can produce protease, which suggests that the fermented lactobacillus mucilaginosus JF5 is hopeful to be used for degrading cell walls of pathogenic fungi and controlling diseases; decomposing cellulose in the compost; preparing livestock and poultry breeding feed and the like.
In a third aspect the invention provides the use of a lactobacillus fermentum JF5 strain according to the first aspect for the production of hyaluronic acid.
The research shows that the probiotics lactobacillus mucilaginosus JF5 can produce Hyaluronic Acid (HA), which suggests that the probiotics lactobacillus mucilaginosus JF5 is expected to be used in the fields of anti-inflammation, anti-angiogenesis, anti-aging, wound inflammation promotion, healing and the like.
In a fourth aspect the invention provides the use of a lactobacillus fermentum JF5 strain according to the first aspect for the preparation of an alpha-glucosidase inhibitor.
Through researches, the probiotic fermented lactobacillus mucilaginosus JF5 can effectively inhibit the activity of alpha-glucosidase, and the alpha-glucosidase is related to type 2 diabetes, and the inhibition of the alpha-glucosidase is one of methods for controlling postprandial hyperglycemia, so that the fermented lactobacillus mucilaginosus JF5 is expected to be applied to the fields of reducing blood sugar, inhibiting obesity and the like.
In a fifth aspect the invention provides the use of a lactobacillus fermentum JF5 strain according to the first aspect for the production of a protease.
The research shows that the probiotics fermented lactobacillus mucilaginosus JF5 can produce cellulase, which suggests that the fermented lactobacillus mucilaginosus JF5 is expected to be used in the fields of promoting the digestion and absorption of protein in food, improving the absorption of small peptide and amino acid, resisting allergy and the like.
In a sixth aspect the invention provides the use of a lactobacillus fermentum JF5 strain according to the first aspect for the production of gamma-aminobutyric acid.
The research shows that the probiotics fermented lactobacillus mucilaginosus JF5 can produce gamma-aminobutyric acid (GABA), which suggests that the fermented lactobacillus mucilaginosus JF5 is expected to be used in the fields of improving the sleeping quality of organisms, resisting depression, resisting anxiety, reducing blood pressure, improving lipid metabolism and the like.
In a seventh aspect, the invention provides the use of a lactobacillus fermentum JF5 strain according to the first aspect for the preparation of an acetylcholinesterase inhibitor.
The research shows that the probiotics lactobacillus fermentum JF5 can effectively inhibit the activity of acetylcholinesterase, and suggests that the probiotics lactobacillus fermentum JF5 is expected to be used in the fields of promoting gastrointestinal absorption, peristalsis and the like.
According to an eighth aspect of the present invention there is provided a bacterial agent for use in a probiotic apparatus, said bacterial agent comprising a lactobacillus mucilaginosus (JF 5) strain according to the first aspect.
Preferably, the lactobacillus mucilaginosus (JF 5) strain is a fermented cell mixture. The culture medium used for fermentation is MRS culture medium.
Preferably, in the field of pharmaceutical application, the microbial agent further comprises a pharmaceutically acceptable carrier and/or excipient.
More preferably, the above excipients refer to diluents, binders, lubricants, disintegrants, co-solvents, stabilizers, etc. and some pharmaceutically acceptable bases which are useful in the pharmaceutical field. The carrier is a functional pharmaceutical adjuvant available in the pharmaceutical field and comprises a surfactant, a suspending agent, an emulsifying agent and a plurality of novel pharmaceutical polymer materials, such as cyclodextrin, chitosan, polylactic acid (PLA), polyglycolic acid-polylactic acid copolymer (PLGA), hyaluronic acid and the like.
Preferably, in the field of medical application, the dosage forms of the microbial inoculum comprise tablets, granules, capsules, dripping pills, sustained release agents, oral liquid preparations and injections.
More preferably, the above-mentioned dosage forms refer to clinically usual dosage forms. Pharmaceutical formulations may be administered orally or parenterally (e.g., intravenously, subcutaneously, intraperitoneally, or topically), and if some drugs are unstable under gastric conditions, they may be formulated as enteric coated tablets.
Compared with the prior art, the invention has the beneficial effects that:
the invention separates a strain of fermented lactobacillus JF5 from pickle samples, and the fermented lactobacillus JF5 has various probiotics effects, including excellent protease activity, excellent cellulase activity, gamma-aminobutyric acid production and secretion, hyaluronic acid production and secretion, alpha-glucosidase activity inhibition, acetylcholinesterase activity inhibition and the like. Thus, lactobacillus mucilaginosus JF5 has the effects of promoting digestion and absorption of protein foods and improving protein allergy; promoting absorption of cellulose and improving constipation; can be used for resisting depression and relieving hangover; anti-aging and anti-wrinkle; reducing blood glucose; promoting intestinal absorption and peristalsis. Therefore, the newly separated fermented lactobacillus mucilaginosus strain JF5 has various probiotics effects, can be used in the fields of improving intestinal tolerance, improving intestinal health, reducing blood fat, helping digestion and the like, for example, can be prepared into food and medicine for reducing blood fat and helping digestion, and has important application value and economic value.
Drawings
FIG. 1 is a phylogenetic tree of Lactobacillus mucilaginosus JF5 and other homologous strains;
FIG. 2 shows the degradation of milk plates by Lactobacillus mucilaginosus JF5 (left, blank; right, experimental group);
FIG. 3 shows the degradation experiment of Lactobacillus mucilaginosus JF5 on cellulose plates (left, blank; right, experimental group);
FIG. 4 shows that Lactobacillus mucilaginosus JF5 produces gamma-aminobutyric acid;
FIG. 5 shows that Lactobacillus mucilaginosus JF5 produces and secretes hyaluronic acid;
FIG. 6 shows that the secretion of substances by Lactobacillus mucilaginous fermentation broth JF5 significantly inhibits alpha-glucosidase activity;
fig. 7 shows that the secretion of substances by lactobacillus mucilaginosus JF5 fermentation broth significantly inhibited acetylcholinesterase activity.
Detailed Description
The following describes the invention in more detail. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The experimental methods in the following examples, unless otherwise specified, are conventional, and the experimental materials used in the following examples, unless otherwise specified, are commercially available.
The following examples relate to the following experimental materials:
(1) Strains: lactobacillus mucilaginosus (JF 5) strain isolated from kimchi in Guangdong area of China by the national institute of university of middle mountain student's intestinal microbiome study moisturizing laboratory and stored in a glycerol tube at-80 ℃ by freezing. In general, it is inoculated on the surface of a plate of MRS solid medium and cultured upside down in a constant temperature anaerobic incubator at 37℃for 24 hours to obtain colonies, or cultured in a constant temperature anaerobic incubator at 37℃for 24-48 hours with shaking in MRS liquid medium to obtain fermentation broth.
(2) The kit comprises: gamma-aminobutyric acid (GABA) detection kit (Cloud-Clone corp., cat: CEA900 Ge), hyaluronic acid (aka hyaluronic acid, HA) detection kit (Cloud-Clone corp., cat: CEA182 Ge), alpha-glucosidase inhibitor screening kit (abcam, cat: ab 284520), acetylcholinesterase inhibitor screening kit (abnova, cat: KA 6219).
(3) MRS plate: 10g of beef extract, 10g of peptone, 5g of yeast extract, 2g of triammonium citrate, 5g of sodium acetate, 20g of glucose, 2g of dipotassium hydrogen phosphate, 1mL of Tween 80, 0.58g of magnesium sulfate, 0.25g of manganese sulfate, 15g of agar and ddH 2 Filling O to 1L, adjusting pH to 6.2-6.6, and autoclaving at 121deg.C for 20min to obtain MRS plate.
(4) MRS liquid medium: 10g of beef extract, 10g of peptone, 5g of yeast extract, 2g of triammonium citrate, 5g of sodium acetate, 20g of glucose, 2g of dipotassium hydrogen phosphate, 1mL of Tween 80, 0.58g of magnesium sulfate, 0.25g of manganese sulfate and ddH 2 Adding O to 1L, adjusting pH to 6.2-6.6, and autoclaving at 121deg.C for 20min to obtain MRS liquid culture medium.
(5) MP plate: 10g of skimmed milk powder, 1g of sodium chloride, 10g of beef extract, 10g of peptone, 5g of yeast extract, 20g of glucose, 2g of tri-ammonium citrate, 5g of sodium acetate, 2g of dipotassium hydrogen phosphate, 0.5mL of Tween 80, 0.58g of magnesium sulfate, 0.25g of manganese sulfate, 15g of agar and ddH 2 Filling O to 1L, adjusting pH to 6.2-6.6, autoclaving at 121deg.C for 20min, and making into MP plate.
(6) CMC plate: 10g of sodium carboxymethyl cellulose, 1.5g of ammonium sulfate, 0.3g of manganese sulfate, 0.2g of calcium chloride, 5g of sodium chloride, 0.3g of urea, 10g of beef extract, 10g of peptone, 5g of yeast extract, 20g of glucose, 2g of tri-ammonium citrate, 5g of sodium acetate, 2g of dipotassium hydrogen phosphate, 0.5mL of tween 80, 0.58g of magnesium sulfate, 0.25g of manganese sulfate, 15g of agar and ddH 2 Filling O to 1L, adjusting pH to 6.2-6.6, autoclaving at 121deg.C for 20min, and preparing into CMC plate.
Example 1 isolation and characterization of Lactobacillus fermentum JF5
The lactobacillus mucilaginosus Limosilactobacillusfermentum JF strain is separated from pickle samples in Guangdong province of China, and is specifically as follows:
repeatedly cleaning pickled cabbage samples for one month purchased from the new phoenix comprehensive meat and vegetable market in Guangzhou sea pearl area with sterile water for 3 times, placing the pickled cabbage samples in a mortar, adding sterile water (v/m=1:10), thoroughly grinding the pickled cabbage samples into homogenate, sucking a proper amount of grinding fluid by a pipette, coating the grinding fluid on an MRS flat plate, and culturing the pickled cabbage pickle samples at room temperature for 3 days. The colonies to be streaked and purified in the separation experiment plates were numbered with a marker and strain numbers were marked on the plates accordingly. Colonies were picked and inoculated onto MRS plates and the strains were purified by plate streaking. If the strain cannot be separated by the method, colonies need to be picked from the enrichment plate, and the colonies are coated on the MRS plate after being subjected to gradient dilution by the MRS liquid culture medium. Reference is made to the "Berger's Manual of identification of bacteria" (eighth edition) and the "manual of identification of fungi" which identify strains belonging to bacteria first, and then the growth of colonies is observed. The purified strain is obtained through preliminary separation, the strain number is JT1, and after 24 hours of culture, bacterial colonies of the strain are observed to be round, milky white, smooth in surface, raised and neat in edge.
Next, after molecular identification by 16S rDNA universal primer (27F: AGAGTTTGATCCTGGCTCAG,1492R: TACGGCTACCTTGTTACGACTT), the isolated L.fermentum JF5 strain was subjected to whole genome sequencing by Beijing Baimeike biosciences Corp. The resulting 16S rDNA sequence (SEQ ID No: 1) was subjected to BLAST alignment at NCBI' S Genome database. The results show that the JF5 strain has >99% homology with the 16S rDNA sequence of the known lactobacillus fermentum (l.fertum); and performing evolution analysis with homologous strains (FIG. 1), confirming that strain JF5 is a different strain of Lactobacillus mucilaginosus.
Finally, strain JF5 is preserved, and the preservation information is as follows: preservation time: 2022, 10 and 4; preservation unit name: china Center for Type Culture Collection (CCTCC); deposit number: cctccc No. M20221511; deposit unit address: chinese university of Wuhan; classification naming: limosilactobacillus referenced.
Lactobacillus fermentum is a probiotic bacterial strain approved by the country for use in food, has wide probiotic effects such as antibacterial, anti-inflammatory and improving health of mother and infant, but different sources of bacterial strains have different effects, which means that the novel lactobacillus fermentum JF5 isolated from kimchi samples according to the present invention can be used as a probiotic and may have novel effects and functions.
L.fermentum JF516S rDNA sequence(1450bp,SEQ ID No:1):
TACTGCAGTCGACGCGTTGGCCCAATTGATTGATGGTGCTTGCACCTGATTGATTTTGGTCGCCAACGAGTGGCGGACGGGTGAGTAACACGTAGGTAACCTGCCCAGAAGCGGGGGACAACATTTGGAAACAGATGCTAATACCGCATAACAACGTTGTTCGCATGAACAACGCTTAAAAGATGGCTTCTCGCTATCACTTCTGGATGGACCTGCGGTGCATTAGCTTGTTGGTGGGGTAAnGGCCTACCAAGGCGATGATGCATAGCCGAGTTGAGAGACTGATCGGCCACAATGGGACTGAGACACGGCCCATACTCCTACGGGAGGCAGCAGTAGGGAATCTTCCACAATGGGCGCAAGCCTGATGGAGCAACACCGCGTGAGTGAAGAAGGGTTTCGGCTCGTAAAGCTCTGTTGTTAAAGAAGAACACGTATGAGAGTAACTGTTCATACGTTGACGGTATTTAACCAGAAAGTCACGGCTAACTACGTGCCAGCAGCCGCGGTAATACGTAGGTGGCAAGCGTTATCCGGATTTATTGGGCGTAAAGAGAGTGCAGGCGGTTTTCTAAGTCTGATGTGAAAGCCTTCGGCTTAACCGGAGAAGTGCATCGGAAACTGGATAACTTGAGTGCAGAAGAGGGTAGTGGAACTCCATGTGTAGCGGTGGAATGCGTAGATATATGGAAGAACACCAGTGGCGAAGGCGGCTACCTGGTCTGCAACTGACGCTGAGACTCGAAAGCATGGGTAGCGAACAGGATTAGATACCCTGGTAGTCCATGCCGTAAACGATGAGTGCTAGGTGTTGGAGGGTTTCCGCCCTTCAGTGCCGGAGCTAACGCATTAAGCACTCCGCCTGGGGAGTACGACCGCAAGGTTGAAACTCAAAGGAATTGACGGGGGCCCGCACAAGCGGTGGAGCATGTGGTTTAATTCGAAGCTACGCGAAGAACCTTACCAGGTCTTGACATCTTGCGCCAACCCTAGAGATAGGGCGTTTCCTTCGGGAACGCAATGACAGGTGGTGCATGGTCGTCGTCAGCTCGTGTCGTGAGATGTTGGGTTAAGTCCCGCAACGAGCGCAACCCTTGTTACTAGTTGCCAGCATTAAGTTGGGCACTCTAGTGAGACTGCCGGTGACAAACCGGAGGAAGGTGGGGACGACGTCAGATCATCATGCCCCTTATGACCTGGGCTACACACGTGCTACAATGGACGGTACAACGAGTCGCGAACTCGCGAGGGCAAGCAAATCTCTTAAAACCGTTCTCAGTTCGGACTGCAGGCTGCAACTCGCCTGCACGAAGTCGGAATCGCTAGTAATCGCGGATCAGCATGCCGCGGTGAATACGTTCCCGGGCCTTGTACACACCGCCCGTCACACCATGAGAGTTTGTAACACCCAAAGTCGGTGGGGTAACCTTTAGGAGCCAGCCGCCTAAGT。
Example 2 function of Lactobacillus mucilaginosus (Lactobacillus fermentum) JF5 and use thereof
(1) Protease capable of producing degradable milk protein by fermenting lactobacillus mucilaginosus JF5 strain
The identification and measurement of the ability of lactobacillus mucilaginosus JF5 to secrete proteolytic proteins was performed according to the agar well diffusion assay using a skim milk plate medium (MP plate). In the test, 3uL of lactobacillus mucilaginosus JF5 bacteria solution with the concentration of 10Abs is dripped into the test group, and 3uL of blank MRS culture medium is dripped into the control group. The cells were cultured in an anaerobic incubator at 37℃for 3 days in an inverted manner. The results showed that JF5 significantly degraded protein and formed a distinct degradation circle (fig. 2) compared to the control with the blank medium, indicating that lactobacillus mucilaginosus JF5 produced protease.
Therefore, the lactobacillus mucilaginosus JF5 can promote the digestion and absorption of protein in food by human body and improve the absorption of small peptide and amino acid when used as a probiotic bacterial strain. And can be used for resisting allergy (improving food allergy caused by protein dyspepsia or non-absorption). In addition, the method can also be used for extracting protease and is applied to the production in the protease fields of food industry, washing industry and the like; can also be used in microbial feed to help animals digest and absorb nutrition, and improve the utilization rate of the feed.
(2) Cellulase produced by fermenting lactobacillus mucilaginosus JF5 strain
The identification and measurement of the cellulose degrading ability of lactobacillus mucilaginosus JF5 were carried out according to the agar well diffusion method, with slight modification, and the cellulose plate medium used was MP medium. In the test, 3uL of lactobacillus mucilaginosus JF5 bacteria solution with the concentration of 10Abs is dripped into the test group, and 3uL of blank MRS culture medium is dripped into the control group. Congo red staining was performed after 3 days of inversion culture in an anaerobic incubator at 37 ℃. The results show that JF5 can significantly degrade cellulose and form a distinct degradation loop compared to the control with the blank medium (fig. 3), indicating that lactobacillus mucilaginosus JF5 can produce cellulase.
It can be seen that probiotic fermented lactobacillus mucilaginosus JF5 strains can serve several purposes by producing the efficacy of cellulases: (1) to facilitate the digestive absorption of dietary components; (2) improving constipation: the cellulose is decomposed in the intestinal canal to generate certain moisture, and the effect of softening the stool is achieved; (3) Cholesterol reduction is the most important effect of cellulose, because the soluble fiber can inhibit the absorption of cholesterol by human body after being absorbed by human body, can be combined with cholesterol in intestinal tract, quickens the metabolism of cholesterol in human body, prevents human body from inducing hyperlipidemia due to hypercholesteremia, and can also reduce the incidence rate of arteriosclerosis and coronary heart disease; (4) The non-sweet 'sugar' of cellulose can slow down the absorption of glucose by blood, balance the concentration of blood sugar and promote the sensitivity of muscle and fat cells to insulin, thereby preventing and assisting in treating diabetes.
In addition, the lactobacillus mucilaginosus JF5 can also be used for fermenting and extracting cellulase, and has wide application in the food industry and the environmental industry; can be applied to degrading cell walls of pathogenic fungi and controlling diseases; can be applied to the decomposition of cellulose in compost; can also be used for preparing livestock and poultry raising feed, such as monogastric animal feed for pigs, chickens and the like, so as to overcome the defect that cellulose cannot be utilized.
(3) Fermentation of Lactobacillus mucilaginosus JF5 strain produces gamma-aminobutyric acid (GABA)
Culturing Lactobacillus fermentum JF5 in MRS liquid culture medium to stationary phase, spreading in new MRS liquid culture medium at dilution ratio of 1:30, collecting bacterial suspension when culturing to stationary phase for 24 hr, centrifuging at 10,000Xg and 4deg.C for 10min, collecting cultured thallus, and collecting thallus with buffer PBS (8 g NaCl, 0.2g KCl, 1.44g Na are weighed 2 HPO 4 、0.24gKH 2 PO 4 Dissolving in 800mL distilled water, regulating the solution to 7.2 with HCl, adding distilled water to a volume of 1L to obtain PBS buffer solution, and determining GABA concentration of cultured thallus by using GABA specific ELISA kit (CEA 900 Ge). The results showed that the concentration of GABA in the cell lysate of JF5 was significantly increased compared to buffer PBS used for lysing cells, and that the cumulative amount was 18.16pg/mL, indicating that Lactobacillus fermentum JF5 can produce gamma-aminobutyric acid in the stationary phase (FIG. 4).
Gamma-aminobutyric acid is an important central nervous system inhibitory neurotransmitter, and is widely present in animals, plants and microorganisms. It has been demonstrated that GABA, a small molecular weight non-protein amino acid, is food safe and can be used as a food additive. Research shows that intake of a certain amount of GABA has the physiological effects of improving sleeping quality of organisms, resisting depression, resisting anxiety, reducing blood pressure, improving lipid metabolism, enhancing memory and brain activity, accelerating brain metabolism, strengthening liver and kidney, promoting ethanol metabolism (dispelling alcohol effect), improving climacteric syndrome and the like.
Thus, the probiotic fermented lactobacillus mucilaginosus JF5 strain can exert the above multiple uses by the effect of producing gamma-aminobutyric acid.
(4) The lactobacillus mucilaginosus JF5 strain can produce and secrete Hyaluronic Acid (HA)
Lactobacillus fermentum JF5 cultured with MRS liquid medium to stationary phase was expanded into new MRS liquid medium at a dilution factor of 1:30, bacterial suspension was collected at 24h of stationary phase, and after centrifugation at 10,000×g at 4 ℃ for 10min, the supernatant of the fermentation broth was collected, and the HA concentration of the supernatant of the fermentation broth was determined by means of hyaluronic acid (also known as hyaluronic acid, HA) specific ELISA kit (CEA 182 Ge). The results showed that the concentration of HA in the fermentation supernatant of JF5 was significantly increased compared to the low concentration of HA in the blank medium MRS, with an accumulated amount of 9.96ng/mL, indicating that lactobacillus mucilaginosus JF5 can produce and secrete hyaluronic acid in the stationary phase (fig. 5).
Hyaluronic acid, also known as hyaluronic acid, is a biodegradable, biocompatible, non-toxic, non-allergenic polymer with a variety of biological functions. Has anti-inflammatory and anti-angiogenesis effects, and has strong anti-aging, moisturizing and wrinkle smoothing abilities. The anti-wrinkle agent is beneficial to skin anti-wrinkle, promotes wound anti-inflammation and healing, can be used as an anti-wrinkle agent, and has the potential of developing skin cosmetics. In addition, HA HAs high lubricating, water absorbing and retaining ability, and can affect various cell functions such as migration, adhesion and proliferation, so that HA is also widely used in biomedical fields such as ophthalmic surgery, arthritis treatment, wound healing scaffolds, tissue engineering, implant materials, and the like.
Thus, the probiotic fermented lactobacillus mucilaginosus JF5 strain can exert the above multiple uses by the efficacy of hyaluronic acid production.
(5) The fermentation liquor of the lactobacillus mucilaginosus JF5 strain can effectively inhibit the activity of alpha-glucosidase
Lactobacillus fermentum JF5 cultured with MRS liquid medium to stationary phase was expanded into new MRS liquid medium at a dilution ratio of 1:30, bacterial suspension was collected at 24h of stationary phase, and after centrifugation at 10,000×g at 4 ℃ for 10min, the supernatant of the fermentation broth was collected, and the effect of the supernatant of the fermentation broth on the enzyme activity ability of α -glucosidase to hydrolyze glucose was measured by an α -glucosidase inhibitor screening kit (ab 284520). The results showed that the fermentation supernatant of JF5 significantly inhibited the ability of α -glucosidase to hydrolyze glucose compared to the non-inhibitory effect of the blank medium MRS, with an inhibition rate of about 58.82%, indicating that the fermentation broth of lactobacillus mucilaginosus JF5 can effectively inhibit the activity of α -glucosidase (fig. 6).
Alpha-glucosidase, an enzyme that plays a role in carbohydrate breakdown, is associated with type 2 diabetes, and inhibition of alpha-glucosidase is one of the methods of controlling postprandial hyperglycemia, thereby contributing to the treatment of diabetes. Thus, α -glucosidase inhibitors help to maintain blood glucose levels and can improve diabetic complications. Furthermore, inhibition of α -glucosidase activity may control obesity.
Thus, the probiotic fermented lactobacillus mucilaginosus JF5 strain has an alpha-glucosidase inhibitory activity, which makes it a potential hypoglycemic and obesity inhibiting probiotic.
(6) Fermented lactobacillus mucilaginosus JF5 strain fermentation liquor can effectively inhibit acetylcholinesterase activity
Lactobacillus fermentum JF5 cultured with MRS liquid medium to stationary phase was expanded into new MRS liquid medium at a dilution ratio of 1:30, bacterial suspension was collected at 24h of stationary phase, and after centrifugation at 10,000×g at 4 ℃ for 10min, the supernatant of the fermentation broth was collected, and the inhibitory ability of the supernatant of the fermentation broth against acetylcholinesterase (AchE) activity was measured by means of acetylcholinesterase inhibitor screening kit (KA 6219). The results showed that the fermentation supernatant of JF5 significantly inhibited the activity of acetylcholinesterase compared to the non-inhibitory effect of the blank medium MRS, with an inhibition rate of about 3.47%, indicating that the fermentation broth of lactobacillus mucilaginosus JF5 can effectively inhibit the activity of acetylcholinesterase (fig. 7).
The acetylcholinesterase inhibitor can continuously accumulate at synapses under the action of acetylcholine released by nerve fiber tips through reversible inhibition of acetylcholinesterase, excite cholinergic receptors, and prolong and increase the action of acetylcholine. Acetylcholinesterase inhibitors can enhance cognitive ability and memory (improve Alzheimer's disease, improve cognitive dysfunction), dilate blood vessels (improve heart rate overspeed), excite skeletal and smooth muscles (improve constipation, postoperative abdominal distension, postoperative urinary retention).
Thus, the probiotic fermented lactobacillus mucilaginosus JF5 strain can inhibit acetylcholinesterase activity, and excite skeletal muscle and smooth muscle of intestinal tract, which makes it a potential probiotic for promoting gastrointestinal absorption and peristalsis.
Taken together, the novel isolated lactobacillus mucilaginosus strain JF5 of the present invention has a variety of probiotic effects: (1) has excellent protease activity; (2) has excellent cellulase activity; (3) gamma-aminobutyric acid can be produced and secreted; (4) can produce and secrete hyaluronic acid; (5) can inhibit alpha-glucosidase activity; (6) can inhibit acetylcholinesterase activity. Therefore, the lactobacillus mucilaginosus strain JF5 has important application value and economic value.
The embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.

Claims (9)

1. A lactobacillus mucilaginosus (Limosilactobacillus fermentum) JF5 strain, wherein the lactobacillus mucilaginosus JF5 strain was deposited with the chinese collection of typical cultures at 2022, 9 and 27 days, under the accession number: cctccc No. M20221511; the 16S rDNA complete sequence of the lactobacillus mucilaginosus JF5 strain is shown in SEQ ID No: 1.
2. Use of a lactobacillus mucilaginosus (Limosilactobacillus fermentum) JF5 strain according to claim 1 for producing cellulases.
3. Use of a lactobacillus mucilaginosus (Limosilactobacillus fermentum) JF5 strain according to claim 1 for the production of hyaluronic acid.
4. Use of a lactobacillus mucilaginosus (Limosilactobacillus fermentum) JF5 strain according to claim 1 for the preparation of an acetylcholinesterase inhibitor.
5. Use of a lactobacillus mucilaginosus (Limosilactobacillus fermentum) JF5 strain according to claim 1 for the production of proteases for the degradation of milk proteins.
6. Use of a lactobacillus mucilaginosus (Limosilactobacillus fermentum) JF5 strain according to claim 1 for the production of gamma-aminobutyric acid.
7. Use of a lactobacillus mucilaginosus (Limosilactobacillus fermentum) JF5 strain according to claim 1 for the preparation of an α -glucosidase inhibitor.
8. A probiotic functional bacterial agent, characterized in that it comprises the lactobacillus mucilaginosus (Limosilactobacillus fermentum) JF5 strain of claim 1.
9. The probiotic functional microbial agent according to claim 8, wherein the microbial agent is a fermented cell mixture of lactobacillus mucilaginosus (Limosilactobacillus fermentum) JF5 strain.
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